diff options
Diffstat (limited to 'src/libgit2/repository.c')
| -rw-r--r-- | src/libgit2/repository.c | 3335 |
1 files changed, 3335 insertions, 0 deletions
diff --git a/src/libgit2/repository.c b/src/libgit2/repository.c new file mode 100644 index 000000000..d2484318f --- /dev/null +++ b/src/libgit2/repository.c @@ -0,0 +1,3335 @@ +/* + * Copyright (C) the libgit2 contributors. All rights reserved. + * + * This file is part of libgit2, distributed under the GNU GPL v2 with + * a Linking Exception. For full terms see the included COPYING file. + */ + +#include "repository.h" + +#include <ctype.h> + +#include "git2/object.h" +#include "git2/sys/repository.h" + +#include "buf.h" +#include "common.h" +#include "commit.h" +#include "tag.h" +#include "blob.h" +#include "futils.h" +#include "sysdir.h" +#include "filebuf.h" +#include "index.h" +#include "config.h" +#include "refs.h" +#include "filter.h" +#include "odb.h" +#include "refdb.h" +#include "remote.h" +#include "merge.h" +#include "diff_driver.h" +#include "annotated_commit.h" +#include "submodule.h" +#include "worktree.h" +#include "path.h" +#include "strmap.h" + +#ifdef GIT_WIN32 +# include "win32/w32_util.h" +#endif + +bool git_repository__validate_ownership = true; +bool git_repository__fsync_gitdir = false; + +static const struct { + git_repository_item_t parent; + git_repository_item_t fallback; + const char *name; + bool directory; +} items[] = { + { GIT_REPOSITORY_ITEM_GITDIR, GIT_REPOSITORY_ITEM__LAST, NULL, true }, + { GIT_REPOSITORY_ITEM_WORKDIR, GIT_REPOSITORY_ITEM__LAST, NULL, true }, + { GIT_REPOSITORY_ITEM_COMMONDIR, GIT_REPOSITORY_ITEM__LAST, NULL, true }, + { GIT_REPOSITORY_ITEM_GITDIR, GIT_REPOSITORY_ITEM__LAST, "index", false }, + { GIT_REPOSITORY_ITEM_COMMONDIR, GIT_REPOSITORY_ITEM_GITDIR, "objects", true }, + { GIT_REPOSITORY_ITEM_COMMONDIR, GIT_REPOSITORY_ITEM_GITDIR, "refs", true }, + { GIT_REPOSITORY_ITEM_COMMONDIR, GIT_REPOSITORY_ITEM_GITDIR, "packed-refs", false }, + { GIT_REPOSITORY_ITEM_COMMONDIR, GIT_REPOSITORY_ITEM_GITDIR, "remotes", true }, + { GIT_REPOSITORY_ITEM_COMMONDIR, GIT_REPOSITORY_ITEM_GITDIR, "config", false }, + { GIT_REPOSITORY_ITEM_COMMONDIR, GIT_REPOSITORY_ITEM_GITDIR, "info", true }, + { GIT_REPOSITORY_ITEM_COMMONDIR, GIT_REPOSITORY_ITEM_GITDIR, "hooks", true }, + { GIT_REPOSITORY_ITEM_COMMONDIR, GIT_REPOSITORY_ITEM_GITDIR, "logs", true }, + { GIT_REPOSITORY_ITEM_GITDIR, GIT_REPOSITORY_ITEM__LAST, "modules", true }, + { GIT_REPOSITORY_ITEM_COMMONDIR, GIT_REPOSITORY_ITEM_GITDIR, "worktrees", true } +}; + +static int check_repositoryformatversion(int *version, git_config *config); +static int check_extensions(git_config *config, int version); +static int load_global_config(git_config **config); + +#define GIT_COMMONDIR_FILE "commondir" +#define GIT_GITDIR_FILE "gitdir" + +#define GIT_FILE_CONTENT_PREFIX "gitdir:" + +#define GIT_BRANCH_DEFAULT "master" + +#define GIT_REPO_VERSION 0 +#define GIT_REPO_MAX_VERSION 1 + +git_str git_repository__reserved_names_win32[] = { + { DOT_GIT, 0, CONST_STRLEN(DOT_GIT) }, + { GIT_DIR_SHORTNAME, 0, CONST_STRLEN(GIT_DIR_SHORTNAME) } +}; +size_t git_repository__reserved_names_win32_len = 2; + +git_str git_repository__reserved_names_posix[] = { + { DOT_GIT, 0, CONST_STRLEN(DOT_GIT) }, +}; +size_t git_repository__reserved_names_posix_len = 1; + +static void set_odb(git_repository *repo, git_odb *odb) +{ + if (odb) { + GIT_REFCOUNT_OWN(odb, repo); + GIT_REFCOUNT_INC(odb); + } + + if ((odb = git_atomic_swap(repo->_odb, odb)) != NULL) { + GIT_REFCOUNT_OWN(odb, NULL); + git_odb_free(odb); + } +} + +static void set_refdb(git_repository *repo, git_refdb *refdb) +{ + if (refdb) { + GIT_REFCOUNT_OWN(refdb, repo); + GIT_REFCOUNT_INC(refdb); + } + + if ((refdb = git_atomic_swap(repo->_refdb, refdb)) != NULL) { + GIT_REFCOUNT_OWN(refdb, NULL); + git_refdb_free(refdb); + } +} + +static void set_config(git_repository *repo, git_config *config) +{ + if (config) { + GIT_REFCOUNT_OWN(config, repo); + GIT_REFCOUNT_INC(config); + } + + if ((config = git_atomic_swap(repo->_config, config)) != NULL) { + GIT_REFCOUNT_OWN(config, NULL); + git_config_free(config); + } + + git_repository__configmap_lookup_cache_clear(repo); +} + +static void set_index(git_repository *repo, git_index *index) +{ + if (index) { + GIT_REFCOUNT_OWN(index, repo); + GIT_REFCOUNT_INC(index); + } + + if ((index = git_atomic_swap(repo->_index, index)) != NULL) { + GIT_REFCOUNT_OWN(index, NULL); + git_index_free(index); + } +} + +int git_repository__cleanup(git_repository *repo) +{ + GIT_ASSERT_ARG(repo); + + git_repository_submodule_cache_clear(repo); + git_cache_clear(&repo->objects); + git_attr_cache_flush(repo); + + set_config(repo, NULL); + set_index(repo, NULL); + set_odb(repo, NULL); + set_refdb(repo, NULL); + + return 0; +} + +void git_repository_free(git_repository *repo) +{ + size_t i; + + if (repo == NULL) + return; + + git_repository__cleanup(repo); + + git_cache_dispose(&repo->objects); + + git_diff_driver_registry_free(repo->diff_drivers); + repo->diff_drivers = NULL; + + for (i = 0; i < repo->reserved_names.size; i++) + git_str_dispose(git_array_get(repo->reserved_names, i)); + git_array_clear(repo->reserved_names); + + git__free(repo->gitlink); + git__free(repo->gitdir); + git__free(repo->commondir); + git__free(repo->workdir); + git__free(repo->namespace); + git__free(repo->ident_name); + git__free(repo->ident_email); + + git__memzero(repo, sizeof(*repo)); + git__free(repo); +} + +/* Check if we have a separate commondir (e.g. we have a worktree) */ +static int lookup_commondir(bool *separate, git_str *commondir, git_str *repository_path) +{ + git_str common_link = GIT_STR_INIT; + int error; + + /* + * If there's no commondir file, the repository path is the + * common path, but it needs a trailing slash. + */ + if (!git_fs_path_contains_file(repository_path, GIT_COMMONDIR_FILE)) { + if ((error = git_str_set(commondir, repository_path->ptr, repository_path->size)) == 0) + error = git_fs_path_to_dir(commondir); + + *separate = false; + goto done; + } + + *separate = true; + + if ((error = git_str_joinpath(&common_link, repository_path->ptr, GIT_COMMONDIR_FILE)) < 0 || + (error = git_futils_readbuffer(&common_link, common_link.ptr)) < 0) + goto done; + + git_str_rtrim(&common_link); + if (git_fs_path_is_relative(common_link.ptr)) { + if ((error = git_str_joinpath(commondir, repository_path->ptr, common_link.ptr)) < 0) + goto done; + } else { + git_str_swap(commondir, &common_link); + } + + git_str_dispose(&common_link); + + /* Make sure the commondir path always has a trailing slash */ + error = git_fs_path_prettify_dir(commondir, commondir->ptr, NULL); + +done: + return error; +} + +GIT_INLINE(int) validate_repo_path(git_str *path) +{ + /* + * The longest static path in a repository (or commondir) is the + * packed refs file. (Loose refs may be longer since they + * include the reference name, but will be validated when the + * path is constructed.) + */ + static size_t suffix_len = + CONST_STRLEN("objects/pack/pack-.pack.lock") + + GIT_OID_HEXSZ; + + return git_fs_path_validate_str_length_with_suffix( + path, suffix_len); +} + +/* + * Git repository open methods + * + * Open a repository object from its path + */ +static int is_valid_repository_path(bool *out, git_str *repository_path, git_str *common_path) +{ + bool separate_commondir = false; + int error; + + *out = false; + + if ((error = lookup_commondir(&separate_commondir, common_path, repository_path)) < 0) + return error; + + /* Ensure HEAD file exists */ + if (git_fs_path_contains_file(repository_path, GIT_HEAD_FILE) == false) + return 0; + + /* Check files in common dir */ + if (git_fs_path_contains_dir(common_path, GIT_OBJECTS_DIR) == false) + return 0; + if (git_fs_path_contains_dir(common_path, GIT_REFS_DIR) == false) + return 0; + + /* Ensure the repo (and commondir) are valid paths */ + if ((error = validate_repo_path(common_path)) < 0 || + (separate_commondir && + (error = validate_repo_path(repository_path)) < 0)) + return error; + + *out = true; + return 0; +} + +static git_repository *repository_alloc(void) +{ + git_repository *repo = git__calloc(1, sizeof(git_repository)); + + if (repo == NULL || + git_cache_init(&repo->objects) < 0) + goto on_error; + + git_array_init_to_size(repo->reserved_names, 4); + if (!repo->reserved_names.ptr) + goto on_error; + + /* set all the entries in the configmap cache to `unset` */ + git_repository__configmap_lookup_cache_clear(repo); + + return repo; + +on_error: + if (repo) + git_cache_dispose(&repo->objects); + + git__free(repo); + return NULL; +} + +int git_repository_new(git_repository **out) +{ + git_repository *repo; + + *out = repo = repository_alloc(); + GIT_ERROR_CHECK_ALLOC(repo); + + repo->is_bare = 1; + repo->is_worktree = 0; + + return 0; +} + +static int load_config_data(git_repository *repo, const git_config *config) +{ + int is_bare; + + int err = git_config_get_bool(&is_bare, config, "core.bare"); + if (err < 0 && err != GIT_ENOTFOUND) + return err; + + /* Try to figure out if it's bare, default to non-bare if it's not set */ + if (err != GIT_ENOTFOUND) + repo->is_bare = is_bare && !repo->is_worktree; + else + repo->is_bare = 0; + + return 0; +} + +static int load_workdir(git_repository *repo, git_config *config, git_str *parent_path) +{ + int error; + git_config_entry *ce; + git_str worktree = GIT_STR_INIT; + git_str path = GIT_STR_INIT; + + if (repo->is_bare) + return 0; + + if ((error = git_config__lookup_entry( + &ce, config, "core.worktree", false)) < 0) + return error; + + if (repo->is_worktree) { + char *gitlink = git_worktree__read_link(repo->gitdir, GIT_GITDIR_FILE); + if (!gitlink) { + error = -1; + goto cleanup; + } + + git_str_attach(&worktree, gitlink, 0); + + if ((git_fs_path_dirname_r(&worktree, worktree.ptr)) < 0 || + git_fs_path_to_dir(&worktree) < 0) { + error = -1; + goto cleanup; + } + + repo->workdir = git_str_detach(&worktree); + } + else if (ce && ce->value) { + if ((error = git_fs_path_prettify_dir( + &worktree, ce->value, repo->gitdir)) < 0) + goto cleanup; + + repo->workdir = git_str_detach(&worktree); + } + else if (parent_path && git_fs_path_isdir(parent_path->ptr)) + repo->workdir = git_str_detach(parent_path); + else { + if (git_fs_path_dirname_r(&worktree, repo->gitdir) < 0 || + git_fs_path_to_dir(&worktree) < 0) { + error = -1; + goto cleanup; + } + + repo->workdir = git_str_detach(&worktree); + } + + GIT_ERROR_CHECK_ALLOC(repo->workdir); +cleanup: + git_str_dispose(&path); + git_config_entry_free(ce); + return error; +} + +/* + * This function returns furthest offset into path where a ceiling dir + * is found, so we can stop processing the path at that point. + * + * Note: converting this to use git_strs instead of GIT_PATH_MAX buffers on + * the stack could remove directories name limits, but at the cost of doing + * repeated malloc/frees inside the loop below, so let's not do it now. + */ +static size_t find_ceiling_dir_offset( + const char *path, + const char *ceiling_directories) +{ + char buf[GIT_PATH_MAX + 1]; + char buf2[GIT_PATH_MAX + 1]; + const char *ceil, *sep; + size_t len, max_len = 0, min_len; + + GIT_ASSERT_ARG(path); + + min_len = (size_t)(git_fs_path_root(path) + 1); + + if (ceiling_directories == NULL || min_len == 0) + return min_len; + + for (sep = ceil = ceiling_directories; *sep; ceil = sep + 1) { + for (sep = ceil; *sep && *sep != GIT_PATH_LIST_SEPARATOR; sep++); + len = sep - ceil; + + if (len == 0 || len >= sizeof(buf) || git_fs_path_root(ceil) == -1) + continue; + + strncpy(buf, ceil, len); + buf[len] = '\0'; + + if (p_realpath(buf, buf2) == NULL) + continue; + + len = strlen(buf2); + if (len > 0 && buf2[len-1] == '/') + buf[--len] = '\0'; + + if (!strncmp(path, buf2, len) && + (path[len] == '/' || !path[len]) && + len > max_len) + { + max_len = len; + } + } + + return (max_len <= min_len ? min_len : max_len); +} + +/* + * Read the contents of `file_path` and set `path_out` to the repo dir that + * it points to. Before calling, set `path_out` to the base directory that + * should be used if the contents of `file_path` are a relative path. + */ +static int read_gitfile(git_str *path_out, const char *file_path) +{ + int error = 0; + git_str file = GIT_STR_INIT; + size_t prefix_len = strlen(GIT_FILE_CONTENT_PREFIX); + + GIT_ASSERT_ARG(path_out); + GIT_ASSERT_ARG(file_path); + + if (git_futils_readbuffer(&file, file_path) < 0) + return -1; + + git_str_rtrim(&file); + /* apparently on Windows, some people use backslashes in paths */ + git_fs_path_mkposix(file.ptr); + + if (git_str_len(&file) <= prefix_len || + memcmp(git_str_cstr(&file), GIT_FILE_CONTENT_PREFIX, prefix_len) != 0) + { + git_error_set(GIT_ERROR_REPOSITORY, + "the `.git` file at '%s' is malformed", file_path); + error = -1; + } + else if ((error = git_fs_path_dirname_r(path_out, file_path)) >= 0) { + const char *gitlink = git_str_cstr(&file) + prefix_len; + while (*gitlink && git__isspace(*gitlink)) gitlink++; + + error = git_fs_path_prettify_dir( + path_out, gitlink, git_str_cstr(path_out)); + } + + git_str_dispose(&file); + return error; +} + +typedef struct { + const char *repo_path; + git_str tmp; + bool is_safe; +} validate_ownership_data; + +static int validate_ownership_cb(const git_config_entry *entry, void *payload) +{ + validate_ownership_data *data = payload; + + if (strcmp(entry->value, "") == 0) + data->is_safe = false; + + if (git_fs_path_prettify_dir(&data->tmp, entry->value, NULL) == 0 && + strcmp(data->tmp.ptr, data->repo_path) == 0) + data->is_safe = true; + + return 0; +} + +static int validate_ownership(const char *repo_path) +{ + git_config *config = NULL; + validate_ownership_data data = { repo_path, GIT_STR_INIT, false }; + bool is_safe; + int error; + + if ((error = git_fs_path_owner_is_system_or_current_user(&is_safe, repo_path)) < 0) { + if (error == GIT_ENOTFOUND) + error = 0; + + goto done; + } + + if (is_safe) { + error = 0; + goto done; + } + + if (load_global_config(&config) == 0) { + error = git_config_get_multivar_foreach(config, "safe.directory", NULL, validate_ownership_cb, &data); + + if (!error && data.is_safe) + goto done; + } + + git_error_set(GIT_ERROR_CONFIG, + "repository path '%s' is not owned by current user", + repo_path); + error = GIT_EOWNER; + +done: + git_config_free(config); + git_str_dispose(&data.tmp); + return error; +} + +static int find_repo( + git_str *gitdir_path, + git_str *workdir_path, + git_str *gitlink_path, + git_str *commondir_path, + const char *start_path, + uint32_t flags, + const char *ceiling_dirs) +{ + git_str path = GIT_STR_INIT; + git_str repo_link = GIT_STR_INIT; + git_str common_link = GIT_STR_INIT; + struct stat st; + dev_t initial_device = 0; + int min_iterations; + bool in_dot_git, is_valid; + size_t ceiling_offset = 0; + int error; + + git_str_clear(gitdir_path); + + error = git_fs_path_prettify(&path, start_path, NULL); + if (error < 0) + return error; + + /* in_dot_git toggles each loop: + * /a/b/c/.git, /a/b/c, /a/b/.git, /a/b, /a/.git, /a + * With GIT_REPOSITORY_OPEN_BARE or GIT_REPOSITORY_OPEN_NO_DOTGIT, we + * assume we started with /a/b/c.git and don't append .git the first + * time through. + * min_iterations indicates the number of iterations left before going + * further counts as a search. */ + if (flags & (GIT_REPOSITORY_OPEN_BARE | GIT_REPOSITORY_OPEN_NO_DOTGIT)) { + in_dot_git = true; + min_iterations = 1; + } else { + in_dot_git = false; + min_iterations = 2; + } + + for (;;) { + if (!(flags & GIT_REPOSITORY_OPEN_NO_DOTGIT)) { + if (!in_dot_git) { + if ((error = git_str_joinpath(&path, path.ptr, DOT_GIT)) < 0) + goto out; + } + in_dot_git = !in_dot_git; + } + + if (p_stat(path.ptr, &st) == 0) { + /* check that we have not crossed device boundaries */ + if (initial_device == 0) + initial_device = st.st_dev; + else if (st.st_dev != initial_device && + !(flags & GIT_REPOSITORY_OPEN_CROSS_FS)) + break; + + if (S_ISDIR(st.st_mode)) { + if ((error = is_valid_repository_path(&is_valid, &path, &common_link)) < 0) + goto out; + + if (is_valid) { + if ((error = git_fs_path_to_dir(&path)) < 0 || + (error = git_str_set(gitdir_path, path.ptr, path.size)) < 0) + goto out; + + if (gitlink_path) + if ((error = git_str_attach(gitlink_path, git_worktree__read_link(path.ptr, GIT_GITDIR_FILE), 0)) < 0) + goto out; + if (commondir_path) + git_str_swap(&common_link, commondir_path); + + break; + } + } else if (S_ISREG(st.st_mode) && git__suffixcmp(path.ptr, "/" DOT_GIT) == 0) { + if ((error = read_gitfile(&repo_link, path.ptr)) < 0 || + (error = is_valid_repository_path(&is_valid, &repo_link, &common_link)) < 0) + goto out; + + if (is_valid) { + git_str_swap(gitdir_path, &repo_link); + + if (gitlink_path) + if ((error = git_str_put(gitlink_path, path.ptr, path.size)) < 0) + goto out; + if (commondir_path) + git_str_swap(&common_link, commondir_path); + } + break; + } + } + + /* Move up one directory. If we're in_dot_git, we'll search the + * parent itself next. If we're !in_dot_git, we'll search .git + * in the parent directory next (added at the top of the loop). */ + if ((error = git_fs_path_dirname_r(&path, path.ptr)) < 0) + goto out; + + /* Once we've checked the directory (and .git if applicable), + * find the ceiling for a search. */ + if (min_iterations && (--min_iterations == 0)) + ceiling_offset = find_ceiling_dir_offset(path.ptr, ceiling_dirs); + + /* Check if we should stop searching here. */ + if (min_iterations == 0 && + (path.ptr[ceiling_offset] == 0 || (flags & GIT_REPOSITORY_OPEN_NO_SEARCH))) + break; + } + + if (workdir_path && !(flags & GIT_REPOSITORY_OPEN_BARE)) { + if (!git_str_len(gitdir_path)) + git_str_clear(workdir_path); + else if ((error = git_fs_path_dirname_r(workdir_path, path.ptr)) < 0 || + (error = git_fs_path_to_dir(workdir_path)) < 0) + goto out; + } + + /* If we didn't find the repository, and we don't have any other error + * to report, report that. */ + if (!git_str_len(gitdir_path)) { + git_error_set(GIT_ERROR_REPOSITORY, "could not find repository from '%s'", start_path); + error = GIT_ENOTFOUND; + goto out; + } + +out: + git_str_dispose(&path); + git_str_dispose(&repo_link); + git_str_dispose(&common_link); + return error; +} + +int git_repository_open_bare( + git_repository **repo_ptr, + const char *bare_path) +{ + git_str path = GIT_STR_INIT, common_path = GIT_STR_INIT; + git_repository *repo = NULL; + bool is_valid; + int error; + + if ((error = git_fs_path_prettify_dir(&path, bare_path, NULL)) < 0 || + (error = is_valid_repository_path(&is_valid, &path, &common_path)) < 0) + return error; + + if (!is_valid) { + git_str_dispose(&path); + git_str_dispose(&common_path); + git_error_set(GIT_ERROR_REPOSITORY, "path is not a repository: %s", bare_path); + return GIT_ENOTFOUND; + } + + repo = repository_alloc(); + GIT_ERROR_CHECK_ALLOC(repo); + + repo->gitdir = git_str_detach(&path); + GIT_ERROR_CHECK_ALLOC(repo->gitdir); + repo->commondir = git_str_detach(&common_path); + GIT_ERROR_CHECK_ALLOC(repo->commondir); + + /* of course we're bare! */ + repo->is_bare = 1; + repo->is_worktree = 0; + repo->workdir = NULL; + + *repo_ptr = repo; + return 0; +} + +static int _git_repository_open_ext_from_env( + git_repository **out, + const char *start_path) +{ + git_repository *repo = NULL; + git_index *index = NULL; + git_odb *odb = NULL; + git_str dir_buf = GIT_STR_INIT; + git_str ceiling_dirs_buf = GIT_STR_INIT; + git_str across_fs_buf = GIT_STR_INIT; + git_str index_file_buf = GIT_STR_INIT; + git_str namespace_buf = GIT_STR_INIT; + git_str object_dir_buf = GIT_STR_INIT; + git_str alts_buf = GIT_STR_INIT; + git_str work_tree_buf = GIT_STR_INIT; + git_str common_dir_buf = GIT_STR_INIT; + const char *ceiling_dirs = NULL; + unsigned flags = 0; + int error; + + if (!start_path) { + error = git__getenv(&dir_buf, "GIT_DIR"); + if (error == GIT_ENOTFOUND) { + git_error_clear(); + start_path = "."; + } else if (error < 0) + goto error; + else { + start_path = git_str_cstr(&dir_buf); + flags |= GIT_REPOSITORY_OPEN_NO_SEARCH; + flags |= GIT_REPOSITORY_OPEN_NO_DOTGIT; + } + } + + error = git__getenv(&ceiling_dirs_buf, "GIT_CEILING_DIRECTORIES"); + if (error == GIT_ENOTFOUND) + git_error_clear(); + else if (error < 0) + goto error; + else + ceiling_dirs = git_str_cstr(&ceiling_dirs_buf); + + error = git__getenv(&across_fs_buf, "GIT_DISCOVERY_ACROSS_FILESYSTEM"); + if (error == GIT_ENOTFOUND) + git_error_clear(); + else if (error < 0) + goto error; + else { + int across_fs = 0; + error = git_config_parse_bool(&across_fs, git_str_cstr(&across_fs_buf)); + if (error < 0) + goto error; + if (across_fs) + flags |= GIT_REPOSITORY_OPEN_CROSS_FS; + } + + error = git__getenv(&index_file_buf, "GIT_INDEX_FILE"); + if (error == GIT_ENOTFOUND) + git_error_clear(); + else if (error < 0) + goto error; + else { + error = git_index_open(&index, git_str_cstr(&index_file_buf)); + if (error < 0) + goto error; + } + + error = git__getenv(&namespace_buf, "GIT_NAMESPACE"); + if (error == GIT_ENOTFOUND) + git_error_clear(); + else if (error < 0) + goto error; + + error = git__getenv(&object_dir_buf, "GIT_OBJECT_DIRECTORY"); + if (error == GIT_ENOTFOUND) + git_error_clear(); + else if (error < 0) + goto error; + else { + error = git_odb_open(&odb, git_str_cstr(&object_dir_buf)); + if (error < 0) + goto error; + } + + error = git__getenv(&work_tree_buf, "GIT_WORK_TREE"); + if (error == GIT_ENOTFOUND) + git_error_clear(); + else if (error < 0) + goto error; + else { + git_error_set(GIT_ERROR_INVALID, "GIT_WORK_TREE unimplemented"); + error = GIT_ERROR; + goto error; + } + + error = git__getenv(&work_tree_buf, "GIT_COMMON_DIR"); + if (error == GIT_ENOTFOUND) + git_error_clear(); + else if (error < 0) + goto error; + else { + git_error_set(GIT_ERROR_INVALID, "GIT_COMMON_DIR unimplemented"); + error = GIT_ERROR; + goto error; + } + + error = git_repository_open_ext(&repo, start_path, flags, ceiling_dirs); + if (error < 0) + goto error; + + if (odb) + git_repository_set_odb(repo, odb); + + error = git__getenv(&alts_buf, "GIT_ALTERNATE_OBJECT_DIRECTORIES"); + if (error == GIT_ENOTFOUND) { + git_error_clear(); + error = 0; + } else if (error < 0) + goto error; + else { + const char *end; + char *alt, *sep; + if (!odb) { + error = git_repository_odb(&odb, repo); + if (error < 0) + goto error; + } + + end = git_str_cstr(&alts_buf) + git_str_len(&alts_buf); + for (sep = alt = alts_buf.ptr; sep != end; alt = sep+1) { + for (sep = alt; *sep && *sep != GIT_PATH_LIST_SEPARATOR; sep++) + ; + if (*sep) + *sep = '\0'; + error = git_odb_add_disk_alternate(odb, alt); + if (error < 0) + goto error; + } + } + + if (git_str_len(&namespace_buf)) { + error = git_repository_set_namespace(repo, git_str_cstr(&namespace_buf)); + if (error < 0) + goto error; + } + + git_repository_set_index(repo, index); + + if (out) { + *out = repo; + goto success; + } +error: + git_repository_free(repo); +success: + git_odb_free(odb); + git_index_free(index); + git_str_dispose(&common_dir_buf); + git_str_dispose(&work_tree_buf); + git_str_dispose(&alts_buf); + git_str_dispose(&object_dir_buf); + git_str_dispose(&namespace_buf); + git_str_dispose(&index_file_buf); + git_str_dispose(&across_fs_buf); + git_str_dispose(&ceiling_dirs_buf); + git_str_dispose(&dir_buf); + return error; +} + +static int repo_is_worktree(unsigned *out, const git_repository *repo) +{ + git_str gitdir_link = GIT_STR_INIT; + int error; + + /* Worktrees cannot have the same commondir and gitdir */ + if (repo->commondir && repo->gitdir + && !strcmp(repo->commondir, repo->gitdir)) { + *out = 0; + return 0; + } + + if ((error = git_str_joinpath(&gitdir_link, repo->gitdir, "gitdir")) < 0) + return -1; + + /* A 'gitdir' file inside a git directory is currently + * only used when the repository is a working tree. */ + *out = !!git_fs_path_exists(gitdir_link.ptr); + + git_str_dispose(&gitdir_link); + return error; +} + +int git_repository_open_ext( + git_repository **repo_ptr, + const char *start_path, + unsigned int flags, + const char *ceiling_dirs) +{ + int error; + unsigned is_worktree; + git_str gitdir = GIT_STR_INIT, workdir = GIT_STR_INIT, + gitlink = GIT_STR_INIT, commondir = GIT_STR_INIT; + git_repository *repo = NULL; + git_config *config = NULL; + const char *validation_path; + int version = 0; + + if (flags & GIT_REPOSITORY_OPEN_FROM_ENV) + return _git_repository_open_ext_from_env(repo_ptr, start_path); + + if (repo_ptr) + *repo_ptr = NULL; + + error = find_repo( + &gitdir, &workdir, &gitlink, &commondir, start_path, flags, ceiling_dirs); + + if (error < 0 || !repo_ptr) + goto cleanup; + + repo = repository_alloc(); + GIT_ERROR_CHECK_ALLOC(repo); + + repo->gitdir = git_str_detach(&gitdir); + GIT_ERROR_CHECK_ALLOC(repo->gitdir); + + if (gitlink.size) { + repo->gitlink = git_str_detach(&gitlink); + GIT_ERROR_CHECK_ALLOC(repo->gitlink); + } + if (commondir.size) { + repo->commondir = git_str_detach(&commondir); + GIT_ERROR_CHECK_ALLOC(repo->commondir); + } + + if ((error = repo_is_worktree(&is_worktree, repo)) < 0) + goto cleanup; + repo->is_worktree = is_worktree; + + /* + * We'd like to have the config, but git doesn't particularly + * care if it's not there, so we need to deal with that. + */ + + error = git_repository_config_snapshot(&config, repo); + if (error < 0 && error != GIT_ENOTFOUND) + goto cleanup; + + if (config && (error = check_repositoryformatversion(&version, config)) < 0) + goto cleanup; + + if ((error = check_extensions(config, version)) < 0) + goto cleanup; + + if ((flags & GIT_REPOSITORY_OPEN_BARE) != 0) { + repo->is_bare = 1; + } else { + if (config && + ((error = load_config_data(repo, config)) < 0 || + (error = load_workdir(repo, config, &workdir)) < 0)) + goto cleanup; + } + + /* + * Ensure that the git directory is owned by the current user. + */ + validation_path = repo->is_bare ? repo->gitdir : repo->workdir; + + if (git_repository__validate_ownership && + (error = validate_ownership(validation_path)) < 0) + goto cleanup; + +cleanup: + git_str_dispose(&gitdir); + git_str_dispose(&workdir); + git_str_dispose(&gitlink); + git_str_dispose(&commondir); + git_config_free(config); + + if (error < 0) + git_repository_free(repo); + else if (repo_ptr) + *repo_ptr = repo; + + return error; +} + +int git_repository_open(git_repository **repo_out, const char *path) +{ + return git_repository_open_ext( + repo_out, path, GIT_REPOSITORY_OPEN_NO_SEARCH, NULL); +} + +int git_repository_open_from_worktree(git_repository **repo_out, git_worktree *wt) +{ + git_str path = GIT_STR_INIT; + git_repository *repo = NULL; + size_t len; + int err; + + GIT_ASSERT_ARG(repo_out); + GIT_ASSERT_ARG(wt); + + *repo_out = NULL; + len = strlen(wt->gitlink_path); + + if (len <= 4 || strcasecmp(wt->gitlink_path + len - 4, ".git")) { + err = -1; + goto out; + } + + if ((err = git_str_set(&path, wt->gitlink_path, len - 4)) < 0) + goto out; + + if ((err = git_repository_open(&repo, path.ptr)) < 0) + goto out; + + *repo_out = repo; + +out: + git_str_dispose(&path); + + return err; +} + +int git_repository_wrap_odb(git_repository **repo_out, git_odb *odb) +{ + git_repository *repo; + + repo = repository_alloc(); + GIT_ERROR_CHECK_ALLOC(repo); + + git_repository_set_odb(repo, odb); + *repo_out = repo; + + return 0; +} + +int git_repository_discover( + git_buf *out, + const char *start_path, + int across_fs, + const char *ceiling_dirs) +{ + uint32_t flags = across_fs ? GIT_REPOSITORY_OPEN_CROSS_FS : 0; + + GIT_ASSERT_ARG(start_path); + + GIT_BUF_WRAP_PRIVATE(out, find_repo, NULL, NULL, NULL, start_path, flags, ceiling_dirs); +} + +static int load_config( + git_config **out, + git_repository *repo, + const char *global_config_path, + const char *xdg_config_path, + const char *system_config_path, + const char *programdata_path) +{ + int error; + git_str config_path = GIT_STR_INIT; + git_config *cfg = NULL; + + GIT_ASSERT_ARG(out); + + if ((error = git_config_new(&cfg)) < 0) + return error; + + if (repo) { + if ((error = git_repository__item_path(&config_path, repo, GIT_REPOSITORY_ITEM_CONFIG)) == 0) + error = git_config_add_file_ondisk(cfg, config_path.ptr, GIT_CONFIG_LEVEL_LOCAL, repo, 0); + + if (error && error != GIT_ENOTFOUND) + goto on_error; + + git_str_dispose(&config_path); + } + + if (global_config_path != NULL && + (error = git_config_add_file_ondisk( + cfg, global_config_path, GIT_CONFIG_LEVEL_GLOBAL, repo, 0)) < 0 && + error != GIT_ENOTFOUND) + goto on_error; + + if (xdg_config_path != NULL && + (error = git_config_add_file_ondisk( + cfg, xdg_config_path, GIT_CONFIG_LEVEL_XDG, repo, 0)) < 0 && + error != GIT_ENOTFOUND) + goto on_error; + + if (system_config_path != NULL && + (error = git_config_add_file_ondisk( + cfg, system_config_path, GIT_CONFIG_LEVEL_SYSTEM, repo, 0)) < 0 && + error != GIT_ENOTFOUND) + goto on_error; + + if (programdata_path != NULL && + (error = git_config_add_file_ondisk( + cfg, programdata_path, GIT_CONFIG_LEVEL_PROGRAMDATA, repo, 0)) < 0 && + error != GIT_ENOTFOUND) + goto on_error; + + git_error_clear(); /* clear any lingering ENOTFOUND errors */ + + *out = cfg; + return 0; + +on_error: + git_str_dispose(&config_path); + git_config_free(cfg); + *out = NULL; + return error; +} + +static const char *path_unless_empty(git_str *buf) +{ + return git_str_len(buf) > 0 ? git_str_cstr(buf) : NULL; +} + +int git_repository_config__weakptr(git_config **out, git_repository *repo) +{ + int error = 0; + + if (repo->_config == NULL) { + git_str global_buf = GIT_STR_INIT; + git_str xdg_buf = GIT_STR_INIT; + git_str system_buf = GIT_STR_INIT; + git_str programdata_buf = GIT_STR_INIT; + git_config *config; + + git_config__find_global(&global_buf); + git_config__find_xdg(&xdg_buf); + git_config__find_system(&system_buf); + git_config__find_programdata(&programdata_buf); + + /* If there is no global file, open a backend for it anyway */ + if (git_str_len(&global_buf) == 0) + git_config__global_location(&global_buf); + + error = load_config( + &config, repo, + path_unless_empty(&global_buf), + path_unless_empty(&xdg_buf), + path_unless_empty(&system_buf), + path_unless_empty(&programdata_buf)); + if (!error) { + GIT_REFCOUNT_OWN(config, repo); + + if (git_atomic_compare_and_swap(&repo->_config, NULL, config) != NULL) { + GIT_REFCOUNT_OWN(config, NULL); + git_config_free(config); + } + } + + git_str_dispose(&global_buf); + git_str_dispose(&xdg_buf); + git_str_dispose(&system_buf); + git_str_dispose(&programdata_buf); + } + + *out = repo->_config; + return error; +} + +int git_repository_config(git_config **out, git_repository *repo) +{ + if (git_repository_config__weakptr(out, repo) < 0) + return -1; + + GIT_REFCOUNT_INC(*out); + return 0; +} + +int git_repository_config_snapshot(git_config **out, git_repository *repo) +{ + int error; + git_config *weak; + + if ((error = git_repository_config__weakptr(&weak, repo)) < 0) + return error; + + return git_config_snapshot(out, weak); +} + +int git_repository_set_config(git_repository *repo, git_config *config) +{ + GIT_ASSERT_ARG(repo); + GIT_ASSERT_ARG(config); + + set_config(repo, config); + return 0; +} + +int git_repository_odb__weakptr(git_odb **out, git_repository *repo) +{ + int error = 0; + + GIT_ASSERT_ARG(repo); + GIT_ASSERT_ARG(out); + + *out = git_atomic_load(repo->_odb); + if (*out == NULL) { + git_str odb_path = GIT_STR_INIT; + git_odb *odb; + + if ((error = git_repository__item_path(&odb_path, repo, + GIT_REPOSITORY_ITEM_OBJECTS)) < 0 || + (error = git_odb_new(&odb)) < 0) + return error; + + GIT_REFCOUNT_OWN(odb, repo); + + if ((error = git_odb__set_caps(odb, GIT_ODB_CAP_FROM_OWNER)) < 0 || + (error = git_odb__add_default_backends(odb, odb_path.ptr, 0, 0)) < 0) { + git_odb_free(odb); + return error; + } + + if (git_atomic_compare_and_swap(&repo->_odb, NULL, odb) != NULL) { + GIT_REFCOUNT_OWN(odb, NULL); + git_odb_free(odb); + } + + git_str_dispose(&odb_path); + *out = git_atomic_load(repo->_odb); + } + + return error; +} + +int git_repository_odb(git_odb **out, git_repository *repo) +{ + if (git_repository_odb__weakptr(out, repo) < 0) + return -1; + + GIT_REFCOUNT_INC(*out); + return 0; +} + +int git_repository_set_odb(git_repository *repo, git_odb *odb) +{ + GIT_ASSERT_ARG(repo); + GIT_ASSERT_ARG(odb); + + set_odb(repo, odb); + return 0; +} + +int git_repository_refdb__weakptr(git_refdb **out, git_repository *repo) +{ + int error = 0; + + GIT_ASSERT_ARG(out); + GIT_ASSERT_ARG(repo); + + if (repo->_refdb == NULL) { + git_refdb *refdb; + + error = git_refdb_open(&refdb, repo); + if (!error) { + GIT_REFCOUNT_OWN(refdb, repo); + + if (git_atomic_compare_and_swap(&repo->_refdb, NULL, refdb) != NULL) { + GIT_REFCOUNT_OWN(refdb, NULL); + git_refdb_free(refdb); + } + } + } + + *out = repo->_refdb; + return error; +} + +int git_repository_refdb(git_refdb **out, git_repository *repo) +{ + if (git_repository_refdb__weakptr(out, repo) < 0) + return -1; + + GIT_REFCOUNT_INC(*out); + return 0; +} + +int git_repository_set_refdb(git_repository *repo, git_refdb *refdb) +{ + GIT_ASSERT_ARG(repo); + GIT_ASSERT_ARG(refdb); + + set_refdb(repo, refdb); + return 0; +} + +int git_repository_index__weakptr(git_index **out, git_repository *repo) +{ + int error = 0; + + GIT_ASSERT_ARG(out); + GIT_ASSERT_ARG(repo); + + if (repo->_index == NULL) { + git_str index_path = GIT_STR_INIT; + git_index *index; + + if ((error = git_str_joinpath(&index_path, repo->gitdir, GIT_INDEX_FILE)) < 0) + return error; + + error = git_index_open(&index, index_path.ptr); + if (!error) { + GIT_REFCOUNT_OWN(index, repo); + + if (git_atomic_compare_and_swap(&repo->_index, NULL, index) != NULL) { + GIT_REFCOUNT_OWN(index, NULL); + git_index_free(index); + } + + error = git_index_set_caps(repo->_index, + GIT_INDEX_CAPABILITY_FROM_OWNER); + } + + git_str_dispose(&index_path); + } + + *out = repo->_index; + return error; +} + +int git_repository_index(git_index **out, git_repository *repo) +{ + if (git_repository_index__weakptr(out, repo) < 0) + return -1; + + GIT_REFCOUNT_INC(*out); + return 0; +} + +int git_repository_set_index(git_repository *repo, git_index *index) +{ + GIT_ASSERT_ARG(repo); + set_index(repo, index); + return 0; +} + +int git_repository_set_namespace(git_repository *repo, const char *namespace) +{ + git__free(repo->namespace); + + if (namespace == NULL) { + repo->namespace = NULL; + return 0; + } + + return (repo->namespace = git__strdup(namespace)) ? 0 : -1; +} + +const char *git_repository_get_namespace(git_repository *repo) +{ + return repo->namespace; +} + +#ifdef GIT_WIN32 +static int reserved_names_add8dot3(git_repository *repo, const char *path) +{ + char *name = git_win32_path_8dot3_name(path); + const char *def = GIT_DIR_SHORTNAME; + const char *def_dot_git = DOT_GIT; + size_t name_len, def_len = CONST_STRLEN(GIT_DIR_SHORTNAME); + size_t def_dot_git_len = CONST_STRLEN(DOT_GIT); + git_str *buf; + + if (!name) + return 0; + + name_len = strlen(name); + + if ((name_len == def_len && memcmp(name, def, def_len) == 0) || + (name_len == def_dot_git_len && memcmp(name, def_dot_git, def_dot_git_len) == 0)) { + git__free(name); + return 0; + } + + if ((buf = git_array_alloc(repo->reserved_names)) == NULL) + return -1; + + git_str_attach(buf, name, name_len); + return true; +} + +bool git_repository__reserved_names( + git_str **out, size_t *outlen, git_repository *repo, bool include_ntfs) +{ + GIT_UNUSED(include_ntfs); + + if (repo->reserved_names.size == 0) { + git_str *buf; + size_t i; + + /* Add the static defaults */ + for (i = 0; i < git_repository__reserved_names_win32_len; i++) { + if ((buf = git_array_alloc(repo->reserved_names)) == NULL) + goto on_error; + + buf->ptr = git_repository__reserved_names_win32[i].ptr; + buf->size = git_repository__reserved_names_win32[i].size; + } + + /* Try to add any repo-specific reserved names - the gitlink file + * within a submodule or the repository (if the repository directory + * is beneath the workdir). These are typically `.git`, but should + * be protected in case they are not. Note, repo and workdir paths + * are always prettified to end in `/`, so a prefixcmp is safe. + */ + if (!repo->is_bare) { + int (*prefixcmp)(const char *, const char *); + int error, ignorecase; + + error = git_repository__configmap_lookup( + &ignorecase, repo, GIT_CONFIGMAP_IGNORECASE); + prefixcmp = (error || ignorecase) ? git__prefixcmp_icase : + git__prefixcmp; + + if (repo->gitlink && + reserved_names_add8dot3(repo, repo->gitlink) < 0) + goto on_error; + + if (repo->gitdir && + prefixcmp(repo->gitdir, repo->workdir) == 0 && + reserved_names_add8dot3(repo, repo->gitdir) < 0) + goto on_error; + } + } + + *out = repo->reserved_names.ptr; + *outlen = repo->reserved_names.size; + + return true; + + /* Always give good defaults, even on OOM */ +on_error: + *out = git_repository__reserved_names_win32; + *outlen = git_repository__reserved_names_win32_len; + + return false; +} +#else +bool git_repository__reserved_names( + git_str **out, size_t *outlen, git_repository *repo, bool include_ntfs) +{ + GIT_UNUSED(repo); + + if (include_ntfs) { + *out = git_repository__reserved_names_win32; + *outlen = git_repository__reserved_names_win32_len; + } else { + *out = git_repository__reserved_names_posix; + *outlen = git_repository__reserved_names_posix_len; + } + + return true; +} +#endif + +static int check_repositoryformatversion(int *version, git_config *config) +{ + int error; + + error = git_config_get_int32(version, config, "core.repositoryformatversion"); + /* git ignores this if the config variable isn't there */ + if (error == GIT_ENOTFOUND) + return 0; + + if (error < 0) + return -1; + + if (GIT_REPO_MAX_VERSION < *version) { + git_error_set(GIT_ERROR_REPOSITORY, + "unsupported repository version %d; only versions up to %d are supported", + *version, GIT_REPO_MAX_VERSION); + return -1; + } + + return 0; +} + +static const char *builtin_extensions[] = { + "noop" +}; + +static git_vector user_extensions = GIT_VECTOR_INIT; + +static int check_valid_extension(const git_config_entry *entry, void *payload) +{ + git_str cfg = GIT_STR_INIT; + bool reject; + const char *extension; + size_t i; + int error = 0; + + GIT_UNUSED(payload); + + git_vector_foreach (&user_extensions, i, extension) { + git_str_clear(&cfg); + + /* + * Users can specify that they don't want to support an + * extension with a '!' prefix. + */ + if ((reject = (extension[0] == '!')) == true) + extension = &extension[1]; + + if ((error = git_str_printf(&cfg, "extensions.%s", extension)) < 0) + goto done; + + if (strcmp(entry->name, cfg.ptr) == 0) { + if (reject) + goto fail; + + goto done; + } + } + + for (i = 0; i < ARRAY_SIZE(builtin_extensions); i++) { + git_str_clear(&cfg); + extension = builtin_extensions[i]; + + if ((error = git_str_printf(&cfg, "extensions.%s", extension)) < 0) + goto done; + + if (strcmp(entry->name, cfg.ptr) == 0) + goto done; + } + +fail: + git_error_set(GIT_ERROR_REPOSITORY, "unsupported extension name %s", entry->name); + error = -1; + +done: + git_str_dispose(&cfg); + return error; +} + +static int check_extensions(git_config *config, int version) +{ + if (version < 1) + return 0; + + return git_config_foreach_match(config, "^extensions\\.", check_valid_extension, NULL); +} + +int git_repository__extensions(char ***out, size_t *out_len) +{ + git_vector extensions; + const char *builtin, *user; + char *extension; + size_t i, j; + + if (git_vector_init(&extensions, 8, NULL) < 0) + return -1; + + for (i = 0; i < ARRAY_SIZE(builtin_extensions); i++) { + bool match = false; + + builtin = builtin_extensions[i]; + + git_vector_foreach (&user_extensions, j, user) { + if (user[0] == '!' && strcmp(builtin, &user[1]) == 0) { + match = true; + break; + } + } + + if (match) + continue; + + if ((extension = git__strdup(builtin)) == NULL || + git_vector_insert(&extensions, extension) < 0) + return -1; + } + + git_vector_foreach (&user_extensions, i, user) { + if (user[0] == '!') + continue; + + if ((extension = git__strdup(user)) == NULL || + git_vector_insert(&extensions, extension) < 0) + return -1; + } + + *out = (char **)git_vector_detach(out_len, NULL, &extensions); + return 0; +} + +int git_repository__set_extensions(const char **extensions, size_t len) +{ + char *extension; + size_t i; + + git_repository__free_extensions(); + + for (i = 0; i < len; i++) { + if ((extension = git__strdup(extensions[i])) == NULL || + git_vector_insert(&user_extensions, extension) < 0) + return -1; + } + + return 0; +} + +void git_repository__free_extensions(void) +{ + git_vector_free_deep(&user_extensions); +} + +int git_repository_create_head(const char *git_dir, const char *ref_name) +{ + git_str ref_path = GIT_STR_INIT; + git_filebuf ref = GIT_FILEBUF_INIT; + const char *fmt; + int error; + + if ((error = git_str_joinpath(&ref_path, git_dir, GIT_HEAD_FILE)) < 0 || + (error = git_filebuf_open(&ref, ref_path.ptr, 0, GIT_REFS_FILE_MODE)) < 0) + goto out; + + if (git__prefixcmp(ref_name, GIT_REFS_DIR) == 0) + fmt = "ref: %s\n"; + else + fmt = "ref: " GIT_REFS_HEADS_DIR "%s\n"; + + if ((error = git_filebuf_printf(&ref, fmt, ref_name)) < 0 || + (error = git_filebuf_commit(&ref)) < 0) + goto out; + +out: + git_str_dispose(&ref_path); + git_filebuf_cleanup(&ref); + return error; +} + +static bool is_chmod_supported(const char *file_path) +{ + struct stat st1, st2; + + if (p_stat(file_path, &st1) < 0) + return false; + + if (p_chmod(file_path, st1.st_mode ^ S_IXUSR) < 0) + return false; + + if (p_stat(file_path, &st2) < 0) + return false; + + return (st1.st_mode != st2.st_mode); +} + +static bool is_filesystem_case_insensitive(const char *gitdir_path) +{ + git_str path = GIT_STR_INIT; + int is_insensitive = -1; + + if (!git_str_joinpath(&path, gitdir_path, "CoNfIg")) + is_insensitive = git_fs_path_exists(git_str_cstr(&path)); + + git_str_dispose(&path); + return is_insensitive; +} + +/* + * Return a configuration object with only the global and system + * configurations; no repository-level configuration. + */ +static int load_global_config(git_config **config) +{ + git_str global_buf = GIT_STR_INIT; + git_str xdg_buf = GIT_STR_INIT; + git_str system_buf = GIT_STR_INIT; + git_str programdata_buf = GIT_STR_INIT; + int error; + + git_config__find_global(&global_buf); + git_config__find_xdg(&xdg_buf); + git_config__find_system(&system_buf); + git_config__find_programdata(&programdata_buf); + + error = load_config(config, NULL, + path_unless_empty(&global_buf), + path_unless_empty(&xdg_buf), + path_unless_empty(&system_buf), + path_unless_empty(&programdata_buf)); + + git_str_dispose(&global_buf); + git_str_dispose(&xdg_buf); + git_str_dispose(&system_buf); + git_str_dispose(&programdata_buf); + + return error; +} + +static bool are_symlinks_supported(const char *wd_path) +{ + git_config *config = NULL; + int symlinks = 0; + + /* + * To emulate Git for Windows, symlinks on Windows must be explicitly + * opted-in. We examine the system configuration for a core.symlinks + * set to true. If found, we then examine the filesystem to see if + * symlinks are _actually_ supported by the current user. If that is + * _not_ set, then we do not test or enable symlink support. + */ +#ifdef GIT_WIN32 + if (load_global_config(&config) < 0 || + git_config_get_bool(&symlinks, config, "core.symlinks") < 0 || + !symlinks) + goto done; +#endif + + if (!(symlinks = git_fs_path_supports_symlinks(wd_path))) + goto done; + +done: + git_config_free(config); + return symlinks != 0; +} + +static int create_empty_file(const char *path, mode_t mode) +{ + int fd; + + if ((fd = p_creat(path, mode)) < 0) { + git_error_set(GIT_ERROR_OS, "error while creating '%s'", path); + return -1; + } + + if (p_close(fd) < 0) { + git_error_set(GIT_ERROR_OS, "error while closing '%s'", path); + return -1; + } + + return 0; +} + +static int repo_local_config( + git_config **out, + git_str *config_dir, + git_repository *repo, + const char *repo_dir) +{ + int error = 0; + git_config *parent; + const char *cfg_path; + + if (git_str_joinpath(config_dir, repo_dir, GIT_CONFIG_FILENAME_INREPO) < 0) + return -1; + cfg_path = git_str_cstr(config_dir); + + /* make LOCAL config if missing */ + if (!git_fs_path_isfile(cfg_path) && + (error = create_empty_file(cfg_path, GIT_CONFIG_FILE_MODE)) < 0) + return error; + + /* if no repo, just open that file directly */ + if (!repo) + return git_config_open_ondisk(out, cfg_path); + + /* otherwise, open parent config and get that level */ + if ((error = git_repository_config__weakptr(&parent, repo)) < 0) + return error; + + if (git_config_open_level(out, parent, GIT_CONFIG_LEVEL_LOCAL) < 0) { + git_error_clear(); + + if (!(error = git_config_add_file_ondisk( + parent, cfg_path, GIT_CONFIG_LEVEL_LOCAL, repo, false))) + error = git_config_open_level(out, parent, GIT_CONFIG_LEVEL_LOCAL); + } + + git_config_free(parent); + + return error; +} + +static int repo_init_fs_configs( + git_config *cfg, + const char *cfg_path, + const char *repo_dir, + const char *work_dir, + bool update_ignorecase) +{ + int error = 0; + + if (!work_dir) + work_dir = repo_dir; + + if ((error = git_config_set_bool( + cfg, "core.filemode", is_chmod_supported(cfg_path))) < 0) + return error; + + if (!are_symlinks_supported(work_dir)) { + if ((error = git_config_set_bool(cfg, "core.symlinks", false)) < 0) + return error; + } else if (git_config_delete_entry(cfg, "core.symlinks") < 0) + git_error_clear(); + + if (update_ignorecase) { + if (is_filesystem_case_insensitive(repo_dir)) { + if ((error = git_config_set_bool(cfg, "core.ignorecase", true)) < 0) + return error; + } else if (git_config_delete_entry(cfg, "core.ignorecase") < 0) + git_error_clear(); + } + +#ifdef GIT_USE_ICONV + if ((error = git_config_set_bool( + cfg, "core.precomposeunicode", + git_fs_path_does_decompose_unicode(work_dir))) < 0) + return error; + /* on non-iconv platforms, don't even set core.precomposeunicode */ +#endif + + return 0; +} + +static int repo_init_config( + const char *repo_dir, + const char *work_dir, + uint32_t flags, + uint32_t mode) +{ + int error = 0; + git_str cfg_path = GIT_STR_INIT, worktree_path = GIT_STR_INIT; + git_config *config = NULL; + bool is_bare = ((flags & GIT_REPOSITORY_INIT_BARE) != 0); + bool is_reinit = ((flags & GIT_REPOSITORY_INIT__IS_REINIT) != 0); + int version = 0; + + if ((error = repo_local_config(&config, &cfg_path, NULL, repo_dir)) < 0) + goto cleanup; + + if (is_reinit && (error = check_repositoryformatversion(&version, config)) < 0) + goto cleanup; + + if ((error = check_extensions(config, version)) < 0) + goto cleanup; + +#define SET_REPO_CONFIG(TYPE, NAME, VAL) do { \ + if ((error = git_config_set_##TYPE(config, NAME, VAL)) < 0) \ + goto cleanup; } while (0) + + SET_REPO_CONFIG(bool, "core.bare", is_bare); + SET_REPO_CONFIG(int32, "core.repositoryformatversion", GIT_REPO_VERSION); + + if ((error = repo_init_fs_configs( + config, cfg_path.ptr, repo_dir, work_dir, !is_reinit)) < 0) + goto cleanup; + + if (!is_bare) { + SET_REPO_CONFIG(bool, "core.logallrefupdates", true); + + if (!(flags & GIT_REPOSITORY_INIT__NATURAL_WD)) { + if ((error = git_str_sets(&worktree_path, work_dir)) < 0) + goto cleanup; + + if ((flags & GIT_REPOSITORY_INIT_RELATIVE_GITLINK)) + if ((error = git_fs_path_make_relative(&worktree_path, repo_dir)) < 0) + goto cleanup; + + SET_REPO_CONFIG(string, "core.worktree", worktree_path.ptr); + } else if (is_reinit) { + if (git_config_delete_entry(config, "core.worktree") < 0) + git_error_clear(); + } + } + + if (mode == GIT_REPOSITORY_INIT_SHARED_GROUP) { + SET_REPO_CONFIG(int32, "core.sharedrepository", 1); + SET_REPO_CONFIG(bool, "receive.denyNonFastforwards", true); + } + else if (mode == GIT_REPOSITORY_INIT_SHARED_ALL) { + SET_REPO_CONFIG(int32, "core.sharedrepository", 2); + SET_REPO_CONFIG(bool, "receive.denyNonFastforwards", true); + } + +cleanup: + git_str_dispose(&cfg_path); + git_str_dispose(&worktree_path); + git_config_free(config); + + return error; +} + +static int repo_reinit_submodule_fs(git_submodule *sm, const char *n, void *p) +{ + git_repository *smrepo = NULL; + GIT_UNUSED(n); GIT_UNUSED(p); + + if (git_submodule_open(&smrepo, sm) < 0 || + git_repository_reinit_filesystem(smrepo, true) < 0) + git_error_clear(); + git_repository_free(smrepo); + + return 0; +} + +int git_repository_reinit_filesystem(git_repository *repo, int recurse) +{ + int error = 0; + git_str path = GIT_STR_INIT; + git_config *config = NULL; + const char *repo_dir = git_repository_path(repo); + + if (!(error = repo_local_config(&config, &path, repo, repo_dir))) + error = repo_init_fs_configs( + config, path.ptr, repo_dir, git_repository_workdir(repo), true); + + git_config_free(config); + git_str_dispose(&path); + + git_repository__configmap_lookup_cache_clear(repo); + + if (!repo->is_bare && recurse) + (void)git_submodule_foreach(repo, repo_reinit_submodule_fs, NULL); + + return error; +} + +static int repo_write_template( + const char *git_dir, + bool allow_overwrite, + const char *file, + mode_t mode, + bool hidden, + const char *content) +{ + git_str path = GIT_STR_INIT; + int fd, error = 0, flags; + + if (git_str_joinpath(&path, git_dir, file) < 0) + return -1; + + if (allow_overwrite) + flags = O_WRONLY | O_CREAT | O_TRUNC; + else + flags = O_WRONLY | O_CREAT | O_EXCL; + + fd = p_open(git_str_cstr(&path), flags, mode); + + if (fd >= 0) { + error = p_write(fd, content, strlen(content)); + + p_close(fd); + } + else if (errno != EEXIST) + error = fd; + +#ifdef GIT_WIN32 + if (!error && hidden) { + if (git_win32__set_hidden(path.ptr, true) < 0) + error = -1; + } +#else + GIT_UNUSED(hidden); +#endif + + git_str_dispose(&path); + + if (error) + git_error_set(GIT_ERROR_OS, + "failed to initialize repository with template '%s'", file); + + return error; +} + +static int repo_write_gitlink( + const char *in_dir, const char *to_repo, bool use_relative_path) +{ + int error; + git_str buf = GIT_STR_INIT; + git_str path_to_repo = GIT_STR_INIT; + struct stat st; + + git_fs_path_dirname_r(&buf, to_repo); + git_fs_path_to_dir(&buf); + if (git_str_oom(&buf)) + return -1; + + /* don't write gitlink to natural workdir */ + if (git__suffixcmp(to_repo, "/" DOT_GIT "/") == 0 && + strcmp(in_dir, buf.ptr) == 0) + { + error = GIT_PASSTHROUGH; + goto cleanup; + } + + if ((error = git_str_joinpath(&buf, in_dir, DOT_GIT)) < 0) + goto cleanup; + + if (!p_stat(buf.ptr, &st) && !S_ISREG(st.st_mode)) { + git_error_set(GIT_ERROR_REPOSITORY, + "cannot overwrite gitlink file into path '%s'", in_dir); + error = GIT_EEXISTS; + goto cleanup; + } + + git_str_clear(&buf); + + error = git_str_sets(&path_to_repo, to_repo); + + if (!error && use_relative_path) + error = git_fs_path_make_relative(&path_to_repo, in_dir); + + if (!error) + error = git_str_join(&buf, ' ', GIT_FILE_CONTENT_PREFIX, path_to_repo.ptr); + + if (!error) + error = repo_write_template(in_dir, true, DOT_GIT, 0666, true, buf.ptr); + +cleanup: + git_str_dispose(&buf); + git_str_dispose(&path_to_repo); + return error; +} + +static mode_t pick_dir_mode(git_repository_init_options *opts) +{ + if (opts->mode == GIT_REPOSITORY_INIT_SHARED_UMASK) + return 0777; + if (opts->mode == GIT_REPOSITORY_INIT_SHARED_GROUP) + return (0775 | S_ISGID); + if (opts->mode == GIT_REPOSITORY_INIT_SHARED_ALL) + return (0777 | S_ISGID); + return opts->mode; +} + +#include "repo_template.h" + +static int repo_init_structure( + const char *repo_dir, + const char *work_dir, + git_repository_init_options *opts) +{ + int error = 0; + repo_template_item *tpl; + bool external_tpl = + ((opts->flags & GIT_REPOSITORY_INIT_EXTERNAL_TEMPLATE) != 0); + mode_t dmode = pick_dir_mode(opts); + bool chmod = opts->mode != GIT_REPOSITORY_INIT_SHARED_UMASK; + + /* Hide the ".git" directory */ +#ifdef GIT_WIN32 + if ((opts->flags & GIT_REPOSITORY_INIT__HAS_DOTGIT) != 0) { + if (git_win32__set_hidden(repo_dir, true) < 0) { + git_error_set(GIT_ERROR_OS, + "failed to mark Git repository folder as hidden"); + return -1; + } + } +#endif + + /* Create the .git gitlink if appropriate */ + if ((opts->flags & GIT_REPOSITORY_INIT_BARE) == 0 && + (opts->flags & GIT_REPOSITORY_INIT__NATURAL_WD) == 0) + { + if (repo_write_gitlink(work_dir, repo_dir, opts->flags & GIT_REPOSITORY_INIT_RELATIVE_GITLINK) < 0) + return -1; + } + + /* Copy external template if requested */ + if (external_tpl) { + git_config *cfg = NULL; + const char *tdir = NULL; + bool default_template = false; + git_str template_buf = GIT_STR_INIT; + + if (opts->template_path) + tdir = opts->template_path; + else if ((error = git_config_open_default(&cfg)) >= 0) { + if (!git_config__get_path(&template_buf, cfg, "init.templatedir")) + tdir = template_buf.ptr; + git_error_clear(); + } + + if (!tdir) { + if (!(error = git_sysdir_find_template_dir(&template_buf))) + tdir = template_buf.ptr; + default_template = true; + } + + /* + * If tdir was the empty string, treat it like tdir was a path to an + * empty directory (so, don't do any copying). This is the behavior + * that git(1) exhibits, although it doesn't seem to be officially + * documented. + */ + if (tdir && git__strcmp(tdir, "") != 0) { + uint32_t cpflags = GIT_CPDIR_COPY_SYMLINKS | + GIT_CPDIR_SIMPLE_TO_MODE | + GIT_CPDIR_COPY_DOTFILES; + if (opts->mode != GIT_REPOSITORY_INIT_SHARED_UMASK) + cpflags |= GIT_CPDIR_CHMOD_DIRS; + error = git_futils_cp_r(tdir, repo_dir, cpflags, dmode); + } + + git_str_dispose(&template_buf); + git_config_free(cfg); + + /* If tdir does not exist, then do not error out. This matches the + * behaviour of git(1), which just prints a warning and continues. + * TODO: issue warning when warning API is available. + * `git` prints to stderr: 'warning: templates not found in /path/to/tdir' + */ + if (error < 0) { + if (!default_template && error != GIT_ENOTFOUND) + return error; + + /* if template was default, ignore error and use internal */ + git_error_clear(); + external_tpl = false; + error = 0; + } + } + + /* Copy internal template + * - always ensure existence of dirs + * - only create files if no external template was specified + */ + for (tpl = repo_template; !error && tpl->path; ++tpl) { + if (!tpl->content) { + uint32_t mkdir_flags = GIT_MKDIR_PATH; + if (chmod) + mkdir_flags |= GIT_MKDIR_CHMOD; + + error = git_futils_mkdir_relative( + tpl->path, repo_dir, dmode, mkdir_flags, NULL); + } + else if (!external_tpl) { + const char *content = tpl->content; + + if (opts->description && strcmp(tpl->path, GIT_DESC_FILE) == 0) + content = opts->description; + + error = repo_write_template( + repo_dir, false, tpl->path, tpl->mode, false, content); + } + } + + return error; +} + +static int mkdir_parent(git_str *buf, uint32_t mode, bool skip2) +{ + /* When making parent directories during repository initialization + * don't try to set gid or grant world write access + */ + return git_futils_mkdir( + buf->ptr, mode & ~(S_ISGID | 0002), + GIT_MKDIR_PATH | GIT_MKDIR_VERIFY_DIR | + (skip2 ? GIT_MKDIR_SKIP_LAST2 : GIT_MKDIR_SKIP_LAST)); +} + +static int repo_init_directories( + git_str *repo_path, + git_str *wd_path, + const char *given_repo, + git_repository_init_options *opts) +{ + int error = 0; + bool is_bare, add_dotgit, has_dotgit, natural_wd; + mode_t dirmode; + + /* There are three possible rules for what we are allowed to create: + * - MKPATH means anything we need + * - MKDIR means just the .git directory and its parent and the workdir + * - Neither means only the .git directory can be created + * + * There are 5 "segments" of path that we might need to deal with: + * 1. The .git directory + * 2. The parent of the .git directory + * 3. Everything above the parent of the .git directory + * 4. The working directory (often the same as #2) + * 5. Everything above the working directory (often the same as #3) + * + * For all directories created, we start with the init_mode value for + * permissions and then strip off bits in some cases: + * + * For MKPATH, we create #3 (and #5) paths without S_ISGID or S_IWOTH + * For MKPATH and MKDIR, we create #2 (and #4) without S_ISGID + * For all rules, we create #1 using the untouched init_mode + */ + + /* set up repo path */ + + is_bare = ((opts->flags & GIT_REPOSITORY_INIT_BARE) != 0); + + add_dotgit = + (opts->flags & GIT_REPOSITORY_INIT_NO_DOTGIT_DIR) == 0 && + !is_bare && + git__suffixcmp(given_repo, "/" DOT_GIT) != 0 && + git__suffixcmp(given_repo, "/" GIT_DIR) != 0; + + if (git_str_joinpath(repo_path, given_repo, add_dotgit ? GIT_DIR : "") < 0) + return -1; + + has_dotgit = (git__suffixcmp(repo_path->ptr, "/" GIT_DIR) == 0); + if (has_dotgit) + opts->flags |= GIT_REPOSITORY_INIT__HAS_DOTGIT; + + /* set up workdir path */ + + if (!is_bare) { + if (opts->workdir_path) { + if (git_fs_path_join_unrooted( + wd_path, opts->workdir_path, repo_path->ptr, NULL) < 0) + return -1; + } else if (has_dotgit) { + if (git_fs_path_dirname_r(wd_path, repo_path->ptr) < 0) + return -1; + } else { + git_error_set(GIT_ERROR_REPOSITORY, "cannot pick working directory" + " for non-bare repository that isn't a '.git' directory"); + return -1; + } + + if (git_fs_path_to_dir(wd_path) < 0) + return -1; + } else { + git_str_clear(wd_path); + } + + natural_wd = + has_dotgit && + wd_path->size > 0 && + wd_path->size + strlen(GIT_DIR) == repo_path->size && + memcmp(repo_path->ptr, wd_path->ptr, wd_path->size) == 0; + if (natural_wd) + opts->flags |= GIT_REPOSITORY_INIT__NATURAL_WD; + + /* create directories as needed / requested */ + + dirmode = pick_dir_mode(opts); + + if ((opts->flags & GIT_REPOSITORY_INIT_MKPATH) != 0) { + /* create path #5 */ + if (wd_path->size > 0 && + (error = mkdir_parent(wd_path, dirmode, false)) < 0) + return error; + + /* create path #3 (if not the same as #5) */ + if (!natural_wd && + (error = mkdir_parent(repo_path, dirmode, has_dotgit)) < 0) + return error; + } + + if ((opts->flags & GIT_REPOSITORY_INIT_MKDIR) != 0 || + (opts->flags & GIT_REPOSITORY_INIT_MKPATH) != 0) + { + /* create path #4 */ + if (wd_path->size > 0 && + (error = git_futils_mkdir( + wd_path->ptr, dirmode & ~S_ISGID, + GIT_MKDIR_VERIFY_DIR)) < 0) + return error; + + /* create path #2 (if not the same as #4) */ + if (!natural_wd && + (error = git_futils_mkdir( + repo_path->ptr, dirmode & ~S_ISGID, + GIT_MKDIR_VERIFY_DIR | GIT_MKDIR_SKIP_LAST)) < 0) + return error; + } + + if ((opts->flags & GIT_REPOSITORY_INIT_MKDIR) != 0 || + (opts->flags & GIT_REPOSITORY_INIT_MKPATH) != 0 || + has_dotgit) + { + /* create path #1 */ + error = git_futils_mkdir(repo_path->ptr, dirmode, + GIT_MKDIR_VERIFY_DIR | ((dirmode & S_ISGID) ? GIT_MKDIR_CHMOD : 0)); + } + + /* prettify both directories now that they are created */ + + if (!error) { + error = git_fs_path_prettify_dir(repo_path, repo_path->ptr, NULL); + + if (!error && wd_path->size > 0) + error = git_fs_path_prettify_dir(wd_path, wd_path->ptr, NULL); + } + + return error; +} + +static int repo_init_head(const char *repo_dir, const char *given) +{ + git_config *cfg = NULL; + git_str head_path = GIT_STR_INIT, cfg_branch = GIT_STR_INIT; + const char *initial_head = NULL; + int error; + + if ((error = git_str_joinpath(&head_path, repo_dir, GIT_HEAD_FILE)) < 0) + goto out; + + /* + * A template may have set a HEAD; use that unless it's been + * overridden by the caller's given initial head setting. + */ + if (git_fs_path_exists(head_path.ptr) && !given) + goto out; + + if (given) { + initial_head = given; + } else if ((error = git_config_open_default(&cfg)) >= 0 && + (error = git_config__get_string_buf(&cfg_branch, cfg, "init.defaultbranch")) >= 0 && + *cfg_branch.ptr) { + initial_head = cfg_branch.ptr; + } + + if (!initial_head) + initial_head = GIT_BRANCH_DEFAULT; + + error = git_repository_create_head(repo_dir, initial_head); + +out: + git_config_free(cfg); + git_str_dispose(&head_path); + git_str_dispose(&cfg_branch); + + return error; +} + +static int repo_init_create_origin(git_repository *repo, const char *url) +{ + int error; + git_remote *remote; + + if (!(error = git_remote_create(&remote, repo, GIT_REMOTE_ORIGIN, url))) { + git_remote_free(remote); + } + + return error; +} + +int git_repository_init( + git_repository **repo_out, const char *path, unsigned is_bare) +{ + git_repository_init_options opts = GIT_REPOSITORY_INIT_OPTIONS_INIT; + + opts.flags = GIT_REPOSITORY_INIT_MKPATH; /* don't love this default */ + if (is_bare) + opts.flags |= GIT_REPOSITORY_INIT_BARE; + + return git_repository_init_ext(repo_out, path, &opts); +} + +int git_repository_init_ext( + git_repository **out, + const char *given_repo, + git_repository_init_options *opts) +{ + git_str repo_path = GIT_STR_INIT, wd_path = GIT_STR_INIT, + common_path = GIT_STR_INIT; + const char *wd; + bool is_valid; + int error; + + GIT_ASSERT_ARG(out); + GIT_ASSERT_ARG(given_repo); + GIT_ASSERT_ARG(opts); + + GIT_ERROR_CHECK_VERSION(opts, GIT_REPOSITORY_INIT_OPTIONS_VERSION, "git_repository_init_options"); + + if ((error = repo_init_directories(&repo_path, &wd_path, given_repo, opts)) < 0) + goto out; + + wd = (opts->flags & GIT_REPOSITORY_INIT_BARE) ? NULL : git_str_cstr(&wd_path); + + if ((error = is_valid_repository_path(&is_valid, &repo_path, &common_path)) < 0) + goto out; + + if (is_valid) { + if ((opts->flags & GIT_REPOSITORY_INIT_NO_REINIT) != 0) { + git_error_set(GIT_ERROR_REPOSITORY, + "attempt to reinitialize '%s'", given_repo); + error = GIT_EEXISTS; + goto out; + } + + opts->flags |= GIT_REPOSITORY_INIT__IS_REINIT; + + if ((error = repo_init_config(repo_path.ptr, wd, opts->flags, opts->mode)) < 0) + goto out; + + /* TODO: reinitialize the templates */ + } else { + if ((error = repo_init_structure(repo_path.ptr, wd, opts)) < 0 || + (error = repo_init_config(repo_path.ptr, wd, opts->flags, opts->mode)) < 0 || + (error = repo_init_head(repo_path.ptr, opts->initial_head)) < 0) + goto out; + } + + if ((error = git_repository_open(out, repo_path.ptr)) < 0) + goto out; + + if (opts->origin_url && + (error = repo_init_create_origin(*out, opts->origin_url)) < 0) + goto out; + +out: + git_str_dispose(&common_path); + git_str_dispose(&repo_path); + git_str_dispose(&wd_path); + + return error; +} + +int git_repository_head_detached(git_repository *repo) +{ + git_reference *ref; + git_odb *odb = NULL; + int exists; + + if (git_repository_odb__weakptr(&odb, repo) < 0) + return -1; + + if (git_reference_lookup(&ref, repo, GIT_HEAD_FILE) < 0) + return -1; + + if (git_reference_type(ref) == GIT_REFERENCE_SYMBOLIC) { + git_reference_free(ref); + return 0; + } + + exists = git_odb_exists(odb, git_reference_target(ref)); + + git_reference_free(ref); + return exists; +} + +int git_repository_head_detached_for_worktree(git_repository *repo, const char *name) +{ + git_reference *ref = NULL; + int error; + + GIT_ASSERT_ARG(repo); + GIT_ASSERT_ARG(name); + + if ((error = git_repository_head_for_worktree(&ref, repo, name)) < 0) + goto out; + + error = (git_reference_type(ref) != GIT_REFERENCE_SYMBOLIC); +out: + git_reference_free(ref); + + return error; +} + +int git_repository_head(git_reference **head_out, git_repository *repo) +{ + git_reference *head; + int error; + + GIT_ASSERT_ARG(head_out); + + if ((error = git_reference_lookup(&head, repo, GIT_HEAD_FILE)) < 0) + return error; + + if (git_reference_type(head) == GIT_REFERENCE_DIRECT) { + *head_out = head; + return 0; + } + + error = git_reference_lookup_resolved(head_out, repo, git_reference_symbolic_target(head), -1); + git_reference_free(head); + + return error == GIT_ENOTFOUND ? GIT_EUNBORNBRANCH : error; +} + +int git_repository_head_for_worktree(git_reference **out, git_repository *repo, const char *name) +{ + git_repository *worktree_repo = NULL; + git_worktree *worktree = NULL; + git_reference *head = NULL; + int error; + + GIT_ASSERT_ARG(out); + GIT_ASSERT_ARG(repo); + GIT_ASSERT_ARG(name); + + *out = NULL; + + if ((error = git_worktree_lookup(&worktree, repo, name)) < 0 || + (error = git_repository_open_from_worktree(&worktree_repo, worktree)) < 0 || + (error = git_reference_lookup(&head, worktree_repo, GIT_HEAD_FILE)) < 0) + goto out; + + if (git_reference_type(head) != GIT_REFERENCE_DIRECT) { + if ((error = git_reference_lookup_resolved(out, worktree_repo, git_reference_symbolic_target(head), -1)) < 0) + goto out; + } else { + *out = head; + head = NULL; + } + +out: + git_reference_free(head); + git_worktree_free(worktree); + git_repository_free(worktree_repo); + return error; +} + +int git_repository_foreach_worktree(git_repository *repo, + git_repository_foreach_worktree_cb cb, + void *payload) +{ + git_strarray worktrees = {0}; + git_repository *worktree_repo = NULL; + git_worktree *worktree = NULL; + int error; + size_t i; + + /* apply operation to repository supplied when commondir is empty, implying there's + * no linked worktrees to iterate, which can occur when using custom odb/refdb + */ + if (!repo->commondir) + return cb(repo, payload); + + if ((error = git_repository_open(&worktree_repo, repo->commondir)) < 0 || + (error = cb(worktree_repo, payload) != 0)) + goto out; + + git_repository_free(worktree_repo); + worktree_repo = NULL; + + if ((error = git_worktree_list(&worktrees, repo)) < 0) + goto out; + + for (i = 0; i < worktrees.count; i++) { + git_repository_free(worktree_repo); + worktree_repo = NULL; + git_worktree_free(worktree); + worktree = NULL; + + if ((error = git_worktree_lookup(&worktree, repo, worktrees.strings[i]) < 0) || + (error = git_repository_open_from_worktree(&worktree_repo, worktree)) < 0) { + if (error != GIT_ENOTFOUND) + goto out; + error = 0; + continue; + } + + if ((error = cb(worktree_repo, payload)) != 0) + goto out; + } + +out: + git_strarray_dispose(&worktrees); + git_repository_free(worktree_repo); + git_worktree_free(worktree); + return error; +} + +int git_repository_head_unborn(git_repository *repo) +{ + git_reference *ref = NULL; + int error; + + error = git_repository_head(&ref, repo); + git_reference_free(ref); + + if (error == GIT_EUNBORNBRANCH) { + git_error_clear(); + return 1; + } + + if (error < 0) + return -1; + + return 0; +} + +static int repo_contains_no_reference(git_repository *repo) +{ + git_reference_iterator *iter; + const char *refname; + int error; + + if ((error = git_reference_iterator_new(&iter, repo)) < 0) + return error; + + error = git_reference_next_name(&refname, iter); + git_reference_iterator_free(iter); + + if (error == GIT_ITEROVER) + return 1; + + return error; +} + +int git_repository_initialbranch(git_str *out, git_repository *repo) +{ + git_config *config; + git_config_entry *entry = NULL; + const char *branch; + int valid, error; + + if ((error = git_repository_config__weakptr(&config, repo)) < 0) + return error; + + if ((error = git_config_get_entry(&entry, config, "init.defaultbranch")) == 0 && + *entry->value) { + branch = entry->value; + } + else if (!error || error == GIT_ENOTFOUND) { + branch = GIT_BRANCH_DEFAULT; + } + else { + goto done; + } + + if ((error = git_str_puts(out, GIT_REFS_HEADS_DIR)) < 0 || + (error = git_str_puts(out, branch)) < 0 || + (error = git_reference_name_is_valid(&valid, out->ptr)) < 0) + goto done; + + if (!valid) { + git_error_set(GIT_ERROR_INVALID, "the value of init.defaultBranch is not a valid branch name"); + error = -1; + } + +done: + git_config_entry_free(entry); + return error; +} + +int git_repository_is_empty(git_repository *repo) +{ + git_reference *head = NULL; + git_str initialbranch = GIT_STR_INIT; + int result = 0; + + if ((result = git_reference_lookup(&head, repo, GIT_HEAD_FILE)) < 0 || + (result = git_repository_initialbranch(&initialbranch, repo)) < 0) + goto done; + + result = (git_reference_type(head) == GIT_REFERENCE_SYMBOLIC && + strcmp(git_reference_symbolic_target(head), initialbranch.ptr) == 0 && + repo_contains_no_reference(repo)); + +done: + git_reference_free(head); + git_str_dispose(&initialbranch); + + return result; +} + +static const char *resolved_parent_path(const git_repository *repo, git_repository_item_t item, git_repository_item_t fallback) +{ + const char *parent; + + switch (item) { + case GIT_REPOSITORY_ITEM_GITDIR: + parent = git_repository_path(repo); + break; + case GIT_REPOSITORY_ITEM_WORKDIR: + parent = git_repository_workdir(repo); + break; + case GIT_REPOSITORY_ITEM_COMMONDIR: + parent = git_repository_commondir(repo); + break; + default: + git_error_set(GIT_ERROR_INVALID, "invalid item directory"); + return NULL; + } + if (!parent && fallback != GIT_REPOSITORY_ITEM__LAST) + return resolved_parent_path(repo, fallback, GIT_REPOSITORY_ITEM__LAST); + + return parent; +} + +int git_repository_item_path( + git_buf *out, + const git_repository *repo, + git_repository_item_t item) +{ + GIT_BUF_WRAP_PRIVATE(out, git_repository__item_path, repo, item); +} + +int git_repository__item_path( + git_str *out, + const git_repository *repo, + git_repository_item_t item) +{ + const char *parent = resolved_parent_path(repo, items[item].parent, items[item].fallback); + if (parent == NULL) { + git_error_set(GIT_ERROR_INVALID, "path cannot exist in repository"); + return GIT_ENOTFOUND; + } + + if (git_str_sets(out, parent) < 0) + return -1; + + if (items[item].name) { + if (git_str_joinpath(out, parent, items[item].name) < 0) + return -1; + } + + if (items[item].directory) { + if (git_fs_path_to_dir(out) < 0) + return -1; + } + + return 0; +} + +const char *git_repository_path(const git_repository *repo) +{ + GIT_ASSERT_ARG_WITH_RETVAL(repo, NULL); + return repo->gitdir; +} + +const char *git_repository_workdir(const git_repository *repo) +{ + GIT_ASSERT_ARG_WITH_RETVAL(repo, NULL); + + if (repo->is_bare) + return NULL; + + return repo->workdir; +} + +int git_repository_workdir_path( + git_str *out, git_repository *repo, const char *path) +{ + int error; + + if (!repo->workdir) { + git_error_set(GIT_ERROR_REPOSITORY, "repository has no working directory"); + return GIT_EBAREREPO; + } + + if (!(error = git_str_joinpath(out, repo->workdir, path))) + error = git_path_validate_str_length(repo, out); + + return error; +} + +const char *git_repository_commondir(const git_repository *repo) +{ + GIT_ASSERT_ARG_WITH_RETVAL(repo, NULL); + return repo->commondir; +} + +int git_repository_set_workdir( + git_repository *repo, const char *workdir, int update_gitlink) +{ + int error = 0; + git_str path = GIT_STR_INIT; + + GIT_ASSERT_ARG(repo); + GIT_ASSERT_ARG(workdir); + + if (git_fs_path_prettify_dir(&path, workdir, NULL) < 0) + return -1; + + if (repo->workdir && strcmp(repo->workdir, path.ptr) == 0) + return 0; + + if (update_gitlink) { + git_config *config; + + if (git_repository_config__weakptr(&config, repo) < 0) + return -1; + + error = repo_write_gitlink(path.ptr, git_repository_path(repo), false); + + /* passthrough error means gitlink is unnecessary */ + if (error == GIT_PASSTHROUGH) + error = git_config_delete_entry(config, "core.worktree"); + else if (!error) + error = git_config_set_string(config, "core.worktree", path.ptr); + + if (!error) + error = git_config_set_bool(config, "core.bare", false); + } + + if (!error) { + char *old_workdir = repo->workdir; + + repo->workdir = git_str_detach(&path); + repo->is_bare = 0; + + git__free(old_workdir); + } + + return error; +} + +int git_repository_is_bare(const git_repository *repo) +{ + GIT_ASSERT_ARG(repo); + return repo->is_bare; +} + +int git_repository_is_worktree(const git_repository *repo) +{ + GIT_ASSERT_ARG(repo); + return repo->is_worktree; +} + +int git_repository_set_bare(git_repository *repo) +{ + int error; + git_config *config; + + GIT_ASSERT_ARG(repo); + + if (repo->is_bare) + return 0; + + if ((error = git_repository_config__weakptr(&config, repo)) < 0) + return error; + + if ((error = git_config_set_bool(config, "core.bare", true)) < 0) + return error; + + if ((error = git_config__update_entry(config, "core.worktree", NULL, true, true)) < 0) + return error; + + git__free(repo->workdir); + repo->workdir = NULL; + repo->is_bare = 1; + + return 0; +} + +int git_repository_head_tree(git_tree **tree, git_repository *repo) +{ + git_reference *head; + git_object *obj; + int error; + + if ((error = git_repository_head(&head, repo)) < 0) + return error; + + if ((error = git_reference_peel(&obj, head, GIT_OBJECT_TREE)) < 0) + goto cleanup; + + *tree = (git_tree *)obj; + +cleanup: + git_reference_free(head); + return error; +} + +int git_repository__set_orig_head(git_repository *repo, const git_oid *orig_head) +{ + git_filebuf file = GIT_FILEBUF_INIT; + git_str file_path = GIT_STR_INIT; + char orig_head_str[GIT_OID_HEXSZ]; + int error = 0; + + git_oid_fmt(orig_head_str, orig_head); + + if ((error = git_str_joinpath(&file_path, repo->gitdir, GIT_ORIG_HEAD_FILE)) == 0 && + (error = git_filebuf_open(&file, file_path.ptr, GIT_FILEBUF_CREATE_LEADING_DIRS, GIT_MERGE_FILE_MODE)) == 0 && + (error = git_filebuf_printf(&file, "%.*s\n", GIT_OID_HEXSZ, orig_head_str)) == 0) + error = git_filebuf_commit(&file); + + if (error < 0) + git_filebuf_cleanup(&file); + + git_str_dispose(&file_path); + + return error; +} + +static int git_repository__message(git_str *out, git_repository *repo) +{ + git_str path = GIT_STR_INIT; + struct stat st; + int error; + + if (git_str_joinpath(&path, repo->gitdir, GIT_MERGE_MSG_FILE) < 0) + return -1; + + if ((error = p_stat(git_str_cstr(&path), &st)) < 0) { + if (errno == ENOENT) + error = GIT_ENOTFOUND; + git_error_set(GIT_ERROR_OS, "could not access message file"); + } else { + error = git_futils_readbuffer(out, git_str_cstr(&path)); + } + + git_str_dispose(&path); + + return error; +} + +int git_repository_message(git_buf *out, git_repository *repo) +{ + GIT_BUF_WRAP_PRIVATE(out, git_repository__message, repo); +} + +int git_repository_message_remove(git_repository *repo) +{ + git_str path = GIT_STR_INIT; + int error; + + if (git_str_joinpath(&path, repo->gitdir, GIT_MERGE_MSG_FILE) < 0) + return -1; + + error = p_unlink(git_str_cstr(&path)); + git_str_dispose(&path); + + return error; +} + +int git_repository_hashfile( + git_oid *out, + git_repository *repo, + const char *path, + git_object_t type, + const char *as_path) +{ + int error; + git_filter_list *fl = NULL; + git_file fd = -1; + uint64_t len; + git_str full_path = GIT_STR_INIT; + const char *workdir = git_repository_workdir(repo); + + /* as_path can be NULL */ + GIT_ASSERT_ARG(out); + GIT_ASSERT_ARG(path); + GIT_ASSERT_ARG(repo); + + if ((error = git_fs_path_join_unrooted(&full_path, path, workdir, NULL)) < 0 || + (error = git_path_validate_str_length(repo, &full_path)) < 0) + return error; + + /* + * NULL as_path means that we should derive it from the + * given path. + */ + if (!as_path) { + if (workdir && !git__prefixcmp(full_path.ptr, workdir)) + as_path = full_path.ptr + strlen(workdir); + else + as_path = ""; + } + + /* passing empty string for "as_path" indicated --no-filters */ + if (strlen(as_path) > 0) { + error = git_filter_list_load( + &fl, repo, NULL, as_path, + GIT_FILTER_TO_ODB, GIT_FILTER_DEFAULT); + + if (error < 0) + return error; + } + + /* at this point, error is a count of the number of loaded filters */ + + fd = git_futils_open_ro(full_path.ptr); + if (fd < 0) { + error = fd; + goto cleanup; + } + + if ((error = git_futils_filesize(&len, fd)) < 0) + goto cleanup; + + if (!git__is_sizet(len)) { + git_error_set(GIT_ERROR_OS, "file size overflow for 32-bit systems"); + error = -1; + goto cleanup; + } + + error = git_odb__hashfd_filtered(out, fd, (size_t)len, type, fl); + +cleanup: + if (fd >= 0) + p_close(fd); + git_filter_list_free(fl); + git_str_dispose(&full_path); + + return error; +} + +static int checkout_message(git_str *out, git_reference *old, const char *new) +{ + git_str_puts(out, "checkout: moving from "); + + if (git_reference_type(old) == GIT_REFERENCE_SYMBOLIC) + git_str_puts(out, git_reference__shorthand(git_reference_symbolic_target(old))); + else + git_str_puts(out, git_oid_tostr_s(git_reference_target(old))); + + git_str_puts(out, " to "); + + if (git_reference__is_branch(new) || + git_reference__is_tag(new) || + git_reference__is_remote(new)) + git_str_puts(out, git_reference__shorthand(new)); + else + git_str_puts(out, new); + + if (git_str_oom(out)) + return -1; + + return 0; +} + +static int detach(git_repository *repo, const git_oid *id, const char *new) +{ + int error; + git_str log_message = GIT_STR_INIT; + git_object *object = NULL, *peeled = NULL; + git_reference *new_head = NULL, *current = NULL; + + GIT_ASSERT_ARG(repo); + GIT_ASSERT_ARG(id); + + if ((error = git_reference_lookup(¤t, repo, GIT_HEAD_FILE)) < 0) + return error; + + if ((error = git_object_lookup(&object, repo, id, GIT_OBJECT_ANY)) < 0) + goto cleanup; + + if ((error = git_object_peel(&peeled, object, GIT_OBJECT_COMMIT)) < 0) + goto cleanup; + + if (new == NULL) + new = git_oid_tostr_s(git_object_id(peeled)); + + if ((error = checkout_message(&log_message, current, new)) < 0) + goto cleanup; + + error = git_reference_create(&new_head, repo, GIT_HEAD_FILE, git_object_id(peeled), true, git_str_cstr(&log_message)); + +cleanup: + git_str_dispose(&log_message); + git_object_free(object); + git_object_free(peeled); + git_reference_free(current); + git_reference_free(new_head); + return error; +} + +int git_repository_set_head( + git_repository *repo, + const char *refname) +{ + git_reference *ref = NULL, *current = NULL, *new_head = NULL; + git_str log_message = GIT_STR_INIT; + int error; + + GIT_ASSERT_ARG(repo); + GIT_ASSERT_ARG(refname); + + if ((error = git_reference_lookup(¤t, repo, GIT_HEAD_FILE)) < 0) + return error; + + if ((error = checkout_message(&log_message, current, refname)) < 0) + goto cleanup; + + error = git_reference_lookup(&ref, repo, refname); + if (error < 0 && error != GIT_ENOTFOUND) + goto cleanup; + + if (ref && current->type == GIT_REFERENCE_SYMBOLIC && git__strcmp(current->target.symbolic, ref->name) && + git_reference_is_branch(ref) && git_branch_is_checked_out(ref)) { + git_error_set(GIT_ERROR_REPOSITORY, "cannot set HEAD to reference '%s' as it is the current HEAD " + "of a linked repository.", git_reference_name(ref)); + error = -1; + goto cleanup; + } + + if (!error) { + if (git_reference_is_branch(ref)) { + error = git_reference_symbolic_create(&new_head, repo, GIT_HEAD_FILE, + git_reference_name(ref), true, git_str_cstr(&log_message)); + } else { + error = detach(repo, git_reference_target(ref), + git_reference_is_tag(ref) || git_reference_is_remote(ref) ? refname : NULL); + } + } else if (git_reference__is_branch(refname)) { + error = git_reference_symbolic_create(&new_head, repo, GIT_HEAD_FILE, refname, + true, git_str_cstr(&log_message)); + } + +cleanup: + git_str_dispose(&log_message); + git_reference_free(current); + git_reference_free(ref); + git_reference_free(new_head); + return error; +} + +int git_repository_set_head_detached( + git_repository *repo, + const git_oid *committish) +{ + return detach(repo, committish, NULL); +} + +int git_repository_set_head_detached_from_annotated( + git_repository *repo, + const git_annotated_commit *committish) +{ + GIT_ASSERT_ARG(repo); + GIT_ASSERT_ARG(committish); + + return detach(repo, git_annotated_commit_id(committish), committish->description); +} + +int git_repository_detach_head(git_repository *repo) +{ + git_reference *old_head = NULL, *new_head = NULL, *current = NULL; + git_object *object = NULL; + git_str log_message = GIT_STR_INIT; + int error; + + GIT_ASSERT_ARG(repo); + + if ((error = git_reference_lookup(¤t, repo, GIT_HEAD_FILE)) < 0) + return error; + + if ((error = git_repository_head(&old_head, repo)) < 0) + goto cleanup; + + if ((error = git_object_lookup(&object, repo, git_reference_target(old_head), GIT_OBJECT_COMMIT)) < 0) + goto cleanup; + + if ((error = checkout_message(&log_message, current, git_oid_tostr_s(git_object_id(object)))) < 0) + goto cleanup; + + error = git_reference_create(&new_head, repo, GIT_HEAD_FILE, git_reference_target(old_head), + 1, git_str_cstr(&log_message)); + +cleanup: + git_str_dispose(&log_message); + git_object_free(object); + git_reference_free(old_head); + git_reference_free(new_head); + git_reference_free(current); + return error; +} + +/** + * Loosely ported from git.git + * https://github.com/git/git/blob/master/contrib/completion/git-prompt.sh#L198-289 + */ +int git_repository_state(git_repository *repo) +{ + git_str repo_path = GIT_STR_INIT; + int state = GIT_REPOSITORY_STATE_NONE; + + GIT_ASSERT_ARG(repo); + + if (git_str_puts(&repo_path, repo->gitdir) < 0) + return -1; + + if (git_fs_path_contains_file(&repo_path, GIT_REBASE_MERGE_INTERACTIVE_FILE)) + state = GIT_REPOSITORY_STATE_REBASE_INTERACTIVE; + else if (git_fs_path_contains_dir(&repo_path, GIT_REBASE_MERGE_DIR)) + state = GIT_REPOSITORY_STATE_REBASE_MERGE; + else if (git_fs_path_contains_file(&repo_path, GIT_REBASE_APPLY_REBASING_FILE)) + state = GIT_REPOSITORY_STATE_REBASE; + else if (git_fs_path_contains_file(&repo_path, GIT_REBASE_APPLY_APPLYING_FILE)) + state = GIT_REPOSITORY_STATE_APPLY_MAILBOX; + else if (git_fs_path_contains_dir(&repo_path, GIT_REBASE_APPLY_DIR)) + state = GIT_REPOSITORY_STATE_APPLY_MAILBOX_OR_REBASE; + else if (git_fs_path_contains_file(&repo_path, GIT_MERGE_HEAD_FILE)) + state = GIT_REPOSITORY_STATE_MERGE; + else if (git_fs_path_contains_file(&repo_path, GIT_REVERT_HEAD_FILE)) { + state = GIT_REPOSITORY_STATE_REVERT; + if (git_fs_path_contains_file(&repo_path, GIT_SEQUENCER_TODO_FILE)) { + state = GIT_REPOSITORY_STATE_REVERT_SEQUENCE; + } + } else if (git_fs_path_contains_file(&repo_path, GIT_CHERRYPICK_HEAD_FILE)) { + state = GIT_REPOSITORY_STATE_CHERRYPICK; + if (git_fs_path_contains_file(&repo_path, GIT_SEQUENCER_TODO_FILE)) { + state = GIT_REPOSITORY_STATE_CHERRYPICK_SEQUENCE; + } + } else if (git_fs_path_contains_file(&repo_path, GIT_BISECT_LOG_FILE)) + state = GIT_REPOSITORY_STATE_BISECT; + + git_str_dispose(&repo_path); + return state; +} + +int git_repository__cleanup_files( + git_repository *repo, const char *files[], size_t files_len) +{ + git_str buf = GIT_STR_INIT; + size_t i; + int error; + + for (error = 0, i = 0; !error && i < files_len; ++i) { + const char *path; + + if (git_str_joinpath(&buf, repo->gitdir, files[i]) < 0) + return -1; + + path = git_str_cstr(&buf); + + if (git_fs_path_isfile(path)) { + error = p_unlink(path); + } else if (git_fs_path_isdir(path)) { + error = git_futils_rmdir_r(path, NULL, + GIT_RMDIR_REMOVE_FILES | GIT_RMDIR_REMOVE_BLOCKERS); + } + + git_str_clear(&buf); + } + + git_str_dispose(&buf); + return error; +} + +static const char *state_files[] = { + GIT_MERGE_HEAD_FILE, + GIT_MERGE_MODE_FILE, + GIT_MERGE_MSG_FILE, + GIT_REVERT_HEAD_FILE, + GIT_CHERRYPICK_HEAD_FILE, + GIT_BISECT_LOG_FILE, + GIT_REBASE_MERGE_DIR, + GIT_REBASE_APPLY_DIR, + GIT_SEQUENCER_DIR, +}; + +int git_repository_state_cleanup(git_repository *repo) +{ + GIT_ASSERT_ARG(repo); + + return git_repository__cleanup_files(repo, state_files, ARRAY_SIZE(state_files)); +} + +int git_repository_is_shallow(git_repository *repo) +{ + git_str path = GIT_STR_INIT; + struct stat st; + int error; + + if ((error = git_str_joinpath(&path, repo->gitdir, "shallow")) < 0) + return error; + + error = git_fs_path_lstat(path.ptr, &st); + git_str_dispose(&path); + + if (error == GIT_ENOTFOUND) { + git_error_clear(); + return 0; + } + + if (error < 0) + return error; + return st.st_size == 0 ? 0 : 1; +} + +int git_repository_init_options_init( + git_repository_init_options *opts, unsigned int version) +{ + GIT_INIT_STRUCTURE_FROM_TEMPLATE( + opts, version, git_repository_init_options, + GIT_REPOSITORY_INIT_OPTIONS_INIT); + return 0; +} + +#ifndef GIT_DEPRECATE_HARD +int git_repository_init_init_options( + git_repository_init_options *opts, unsigned int version) +{ + return git_repository_init_options_init(opts, version); +} +#endif + +int git_repository_ident(const char **name, const char **email, const git_repository *repo) +{ + *name = repo->ident_name; + *email = repo->ident_email; + + return 0; +} + +int git_repository_set_ident(git_repository *repo, const char *name, const char *email) +{ + char *tmp_name = NULL, *tmp_email = NULL; + + if (name) { + tmp_name = git__strdup(name); + GIT_ERROR_CHECK_ALLOC(tmp_name); + } + + if (email) { + tmp_email = git__strdup(email); + GIT_ERROR_CHECK_ALLOC(tmp_email); + } + + tmp_name = git_atomic_swap(repo->ident_name, tmp_name); + tmp_email = git_atomic_swap(repo->ident_email, tmp_email); + + git__free(tmp_name); + git__free(tmp_email); + + return 0; +} + +int git_repository_submodule_cache_all(git_repository *repo) +{ + GIT_ASSERT_ARG(repo); + return git_submodule_cache_init(&repo->submodule_cache, repo); +} + +int git_repository_submodule_cache_clear(git_repository *repo) +{ + int error = 0; + GIT_ASSERT_ARG(repo); + + error = git_submodule_cache_free(repo->submodule_cache); + repo->submodule_cache = NULL; + return error; +} |