diff options
Diffstat (limited to 'src/futils.c')
| -rw-r--r-- | src/futils.c | 1188 |
1 files changed, 0 insertions, 1188 deletions
diff --git a/src/futils.c b/src/futils.c deleted file mode 100644 index a44820875..000000000 --- a/src/futils.c +++ /dev/null @@ -1,1188 +0,0 @@ -/* - * 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 "futils.h" - -#include "runtime.h" -#include "strmap.h" -#include "hash.h" -#include <ctype.h> -#if GIT_WIN32 -#include "win32/findfile.h" -#endif - -int git_futils_mkpath2file(const char *file_path, const mode_t mode) -{ - return git_futils_mkdir( - file_path, mode, - GIT_MKDIR_PATH | GIT_MKDIR_SKIP_LAST | GIT_MKDIR_VERIFY_DIR); -} - -int git_futils_mktmp(git_buf *path_out, const char *filename, mode_t mode) -{ - int fd; - mode_t mask; - - p_umask(mask = p_umask(0)); - - git_buf_sets(path_out, filename); - git_buf_puts(path_out, "_git2_XXXXXX"); - - if (git_buf_oom(path_out)) - return -1; - - if ((fd = p_mkstemp(path_out->ptr)) < 0) { - git_error_set(GIT_ERROR_OS, - "failed to create temporary file '%s'", path_out->ptr); - return -1; - } - - if (p_chmod(path_out->ptr, (mode & ~mask))) { - git_error_set(GIT_ERROR_OS, - "failed to set permissions on file '%s'", path_out->ptr); - return -1; - } - - return fd; -} - -int git_futils_creat_withpath(const char *path, const mode_t dirmode, const mode_t mode) -{ - int fd; - - if (git_futils_mkpath2file(path, dirmode) < 0) - return -1; - - fd = p_creat(path, mode); - if (fd < 0) { - git_error_set(GIT_ERROR_OS, "failed to create file '%s'", path); - return -1; - } - - return fd; -} - -int git_futils_creat_locked(const char *path, const mode_t mode) -{ - int fd = p_open(path, O_WRONLY | O_CREAT | O_EXCL | O_BINARY | O_CLOEXEC, - mode); - - if (fd < 0) { - int error = errno; - git_error_set(GIT_ERROR_OS, "failed to create locked file '%s'", path); - switch (error) { - case EEXIST: - return GIT_ELOCKED; - case ENOENT: - return GIT_ENOTFOUND; - default: - return -1; - } - } - - return fd; -} - -int git_futils_creat_locked_withpath(const char *path, const mode_t dirmode, const mode_t mode) -{ - if (git_futils_mkpath2file(path, dirmode) < 0) - return -1; - - return git_futils_creat_locked(path, mode); -} - -int git_futils_open_ro(const char *path) -{ - int fd = p_open(path, O_RDONLY); - if (fd < 0) - return git_path_set_error(errno, path, "open"); - return fd; -} - -int git_futils_truncate(const char *path, int mode) -{ - int fd = p_open(path, O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC, mode); - if (fd < 0) - return git_path_set_error(errno, path, "open"); - - close(fd); - return 0; -} - -int git_futils_filesize(uint64_t *out, git_file fd) -{ - struct stat sb; - - if (p_fstat(fd, &sb)) { - git_error_set(GIT_ERROR_OS, "failed to stat file descriptor"); - return -1; - } - - if (sb.st_size < 0) { - git_error_set(GIT_ERROR_INVALID, "invalid file size"); - return -1; - } - - *out = sb.st_size; - return 0; -} - -mode_t git_futils_canonical_mode(mode_t raw_mode) -{ - if (S_ISREG(raw_mode)) - return S_IFREG | GIT_PERMS_CANONICAL(raw_mode); - else if (S_ISLNK(raw_mode)) - return S_IFLNK; - else if (S_ISGITLINK(raw_mode)) - return S_IFGITLINK; - else if (S_ISDIR(raw_mode)) - return S_IFDIR; - else - return 0; -} - -int git_futils_readbuffer_fd(git_buf *buf, git_file fd, size_t len) -{ - ssize_t read_size = 0; - size_t alloc_len; - - git_buf_clear(buf); - - if (!git__is_ssizet(len)) { - git_error_set(GIT_ERROR_INVALID, "read too large"); - return -1; - } - - GIT_ERROR_CHECK_ALLOC_ADD(&alloc_len, len, 1); - if (git_buf_grow(buf, alloc_len) < 0) - return -1; - - /* p_read loops internally to read len bytes */ - read_size = p_read(fd, buf->ptr, len); - - if (read_size != (ssize_t)len) { - git_error_set(GIT_ERROR_OS, "failed to read descriptor"); - git_buf_dispose(buf); - return -1; - } - - buf->ptr[read_size] = '\0'; - buf->size = read_size; - - return 0; -} - -int git_futils_readbuffer_updated( - git_buf *out, const char *path, git_oid *checksum, int *updated) -{ - int error; - git_file fd; - struct stat st; - git_buf buf = GIT_BUF_INIT; - git_oid checksum_new; - - GIT_ASSERT_ARG(out); - GIT_ASSERT_ARG(path && *path); - - if (updated != NULL) - *updated = 0; - - if (p_stat(path, &st) < 0) - return git_path_set_error(errno, path, "stat"); - - - if (S_ISDIR(st.st_mode)) { - git_error_set(GIT_ERROR_INVALID, "requested file is a directory"); - return GIT_ENOTFOUND; - } - - if (!git__is_sizet(st.st_size+1)) { - git_error_set(GIT_ERROR_OS, "invalid regular file stat for '%s'", path); - return -1; - } - - if ((fd = git_futils_open_ro(path)) < 0) - return fd; - - if (git_futils_readbuffer_fd(&buf, fd, (size_t)st.st_size) < 0) { - p_close(fd); - return -1; - } - - p_close(fd); - - if (checksum) { - if ((error = git_hash_buf(&checksum_new, buf.ptr, buf.size)) < 0) { - git_buf_dispose(&buf); - return error; - } - - /* - * If we were given a checksum, we only want to use it if it's different - */ - if (!git_oid__cmp(checksum, &checksum_new)) { - git_buf_dispose(&buf); - if (updated) - *updated = 0; - - return 0; - } - - git_oid_cpy(checksum, &checksum_new); - } - - /* - * If we're here, the file did change, or the user didn't have an old version - */ - if (updated != NULL) - *updated = 1; - - git_buf_swap(out, &buf); - git_buf_dispose(&buf); - - return 0; -} - -int git_futils_readbuffer(git_buf *buf, const char *path) -{ - return git_futils_readbuffer_updated(buf, path, NULL, NULL); -} - -int git_futils_writebuffer( - const git_buf *buf, const char *path, int flags, mode_t mode) -{ - int fd, do_fsync = 0, error = 0; - - if (!flags) - flags = O_CREAT | O_TRUNC | O_WRONLY; - - if ((flags & O_FSYNC) != 0) - do_fsync = 1; - - flags &= ~O_FSYNC; - - if (!mode) - mode = GIT_FILEMODE_BLOB; - - if ((fd = p_open(path, flags, mode)) < 0) { - git_error_set(GIT_ERROR_OS, "could not open '%s' for writing", path); - return fd; - } - - if ((error = p_write(fd, git_buf_cstr(buf), git_buf_len(buf))) < 0) { - git_error_set(GIT_ERROR_OS, "could not write to '%s'", path); - (void)p_close(fd); - return error; - } - - if (do_fsync && (error = p_fsync(fd)) < 0) { - git_error_set(GIT_ERROR_OS, "could not fsync '%s'", path); - p_close(fd); - return error; - } - - if ((error = p_close(fd)) < 0) { - git_error_set(GIT_ERROR_OS, "error while closing '%s'", path); - return error; - } - - if (do_fsync && (flags & O_CREAT)) - error = git_futils_fsync_parent(path); - - return error; -} - -int git_futils_mv_withpath(const char *from, const char *to, const mode_t dirmode) -{ - if (git_futils_mkpath2file(to, dirmode) < 0) - return -1; - - if (p_rename(from, to) < 0) { - git_error_set(GIT_ERROR_OS, "failed to rename '%s' to '%s'", from, to); - return -1; - } - - return 0; -} - -int git_futils_mmap_ro(git_map *out, git_file fd, off64_t begin, size_t len) -{ - return p_mmap(out, len, GIT_PROT_READ, GIT_MAP_SHARED, fd, begin); -} - -int git_futils_mmap_ro_file(git_map *out, const char *path) -{ - git_file fd = git_futils_open_ro(path); - uint64_t len; - int result; - - if (fd < 0) - return fd; - - if ((result = git_futils_filesize(&len, fd)) < 0) - goto out; - - if (!git__is_sizet(len)) { - git_error_set(GIT_ERROR_OS, "file `%s` too large to mmap", path); - result = -1; - goto out; - } - - result = git_futils_mmap_ro(out, fd, 0, (size_t)len); -out: - p_close(fd); - return result; -} - -void git_futils_mmap_free(git_map *out) -{ - p_munmap(out); -} - -GIT_INLINE(int) mkdir_validate_dir( - const char *path, - struct stat *st, - mode_t mode, - uint32_t flags, - struct git_futils_mkdir_options *opts) -{ - /* with exclusive create, existing dir is an error */ - if ((flags & GIT_MKDIR_EXCL) != 0) { - git_error_set(GIT_ERROR_FILESYSTEM, - "failed to make directory '%s': directory exists", path); - return GIT_EEXISTS; - } - - if ((S_ISREG(st->st_mode) && (flags & GIT_MKDIR_REMOVE_FILES)) || - (S_ISLNK(st->st_mode) && (flags & GIT_MKDIR_REMOVE_SYMLINKS))) { - if (p_unlink(path) < 0) { - git_error_set(GIT_ERROR_OS, "failed to remove %s '%s'", - S_ISLNK(st->st_mode) ? "symlink" : "file", path); - return GIT_EEXISTS; - } - - opts->perfdata.mkdir_calls++; - - if (p_mkdir(path, mode) < 0) { - git_error_set(GIT_ERROR_OS, "failed to make directory '%s'", path); - return GIT_EEXISTS; - } - } - - else if (S_ISLNK(st->st_mode)) { - /* Re-stat the target, make sure it's a directory */ - opts->perfdata.stat_calls++; - - if (p_stat(path, st) < 0) { - git_error_set(GIT_ERROR_OS, "failed to make directory '%s'", path); - return GIT_EEXISTS; - } - } - - else if (!S_ISDIR(st->st_mode)) { - git_error_set(GIT_ERROR_FILESYSTEM, - "failed to make directory '%s': directory exists", path); - return GIT_EEXISTS; - } - - return 0; -} - -GIT_INLINE(int) mkdir_validate_mode( - const char *path, - struct stat *st, - bool terminal_path, - mode_t mode, - uint32_t flags, - struct git_futils_mkdir_options *opts) -{ - if (((terminal_path && (flags & GIT_MKDIR_CHMOD) != 0) || - (flags & GIT_MKDIR_CHMOD_PATH) != 0) && st->st_mode != mode) { - - opts->perfdata.chmod_calls++; - - if (p_chmod(path, mode) < 0) { - git_error_set(GIT_ERROR_OS, "failed to set permissions on '%s'", path); - return -1; - } - } - - return 0; -} - -GIT_INLINE(int) mkdir_canonicalize( - git_buf *path, - uint32_t flags) -{ - ssize_t root_len; - - if (path->size == 0) { - git_error_set(GIT_ERROR_OS, "attempt to create empty path"); - return -1; - } - - /* Trim trailing slashes (except the root) */ - if ((root_len = git_path_root(path->ptr)) < 0) - root_len = 0; - else - root_len++; - - while (path->size > (size_t)root_len && path->ptr[path->size - 1] == '/') - path->ptr[--path->size] = '\0'; - - /* if we are not supposed to made the last element, truncate it */ - if ((flags & GIT_MKDIR_SKIP_LAST2) != 0) { - git_path_dirname_r(path, path->ptr); - flags |= GIT_MKDIR_SKIP_LAST; - } - if ((flags & GIT_MKDIR_SKIP_LAST) != 0) { - git_path_dirname_r(path, path->ptr); - } - - /* We were either given the root path (or trimmed it to - * the root), we don't have anything to do. - */ - if (path->size <= (size_t)root_len) - git_buf_clear(path); - - return 0; -} - -int git_futils_mkdir( - const char *path, - mode_t mode, - uint32_t flags) -{ - git_buf make_path = GIT_BUF_INIT, parent_path = GIT_BUF_INIT; - const char *relative; - struct git_futils_mkdir_options opts = { 0 }; - struct stat st; - size_t depth = 0; - int len = 0, root_len, error; - - if ((error = git_buf_puts(&make_path, path)) < 0 || - (error = mkdir_canonicalize(&make_path, flags)) < 0 || - (error = git_buf_puts(&parent_path, make_path.ptr)) < 0 || - make_path.size == 0) - goto done; - - root_len = git_path_root(make_path.ptr); - - /* find the first parent directory that exists. this will be used - * as the base to dirname_relative. - */ - for (relative = make_path.ptr; parent_path.size; ) { - error = p_lstat(parent_path.ptr, &st); - - if (error == 0) { - break; - } else if (errno != ENOENT) { - git_error_set(GIT_ERROR_OS, "failed to stat '%s'", parent_path.ptr); - error = -1; - goto done; - } - - depth++; - - /* examine the parent of the current path */ - if ((len = git_path_dirname_r(&parent_path, parent_path.ptr)) < 0) { - error = len; - goto done; - } - - GIT_ASSERT(len); - - /* - * We've walked all the given path's parents and it's either relative - * (the parent is simply '.') or rooted (the length is less than or - * equal to length of the root path). The path may be less than the - * root path length on Windows, where `C:` == `C:/`. - */ - if ((len == 1 && parent_path.ptr[0] == '.') || - (len == 1 && parent_path.ptr[0] == '/') || - len <= root_len) { - relative = make_path.ptr; - break; - } - - relative = make_path.ptr + len + 1; - - /* not recursive? just make this directory relative to its parent. */ - if ((flags & GIT_MKDIR_PATH) == 0) - break; - } - - /* we found an item at the location we're trying to create, - * validate it. - */ - if (depth == 0) { - error = mkdir_validate_dir(make_path.ptr, &st, mode, flags, &opts); - - if (!error) - error = mkdir_validate_mode( - make_path.ptr, &st, true, mode, flags, &opts); - - goto done; - } - - /* we already took `SKIP_LAST` and `SKIP_LAST2` into account when - * canonicalizing `make_path`. - */ - flags &= ~(GIT_MKDIR_SKIP_LAST2 | GIT_MKDIR_SKIP_LAST); - - error = git_futils_mkdir_relative(relative, - parent_path.size ? parent_path.ptr : NULL, mode, flags, &opts); - -done: - git_buf_dispose(&make_path); - git_buf_dispose(&parent_path); - return error; -} - -int git_futils_mkdir_r(const char *path, const mode_t mode) -{ - return git_futils_mkdir(path, mode, GIT_MKDIR_PATH); -} - -int git_futils_mkdir_relative( - const char *relative_path, - const char *base, - mode_t mode, - uint32_t flags, - struct git_futils_mkdir_options *opts) -{ - git_buf make_path = GIT_BUF_INIT; - ssize_t root = 0, min_root_len; - char lastch = '/', *tail; - struct stat st; - struct git_futils_mkdir_options empty_opts = {0}; - int error; - - if (!opts) - opts = &empty_opts; - - /* build path and find "root" where we should start calling mkdir */ - if (git_path_join_unrooted(&make_path, relative_path, base, &root) < 0) - return -1; - - if ((error = mkdir_canonicalize(&make_path, flags)) < 0 || - make_path.size == 0) - goto done; - - /* if we are not supposed to make the whole path, reset root */ - if ((flags & GIT_MKDIR_PATH) == 0) - root = git_buf_rfind(&make_path, '/'); - - /* advance root past drive name or network mount prefix */ - min_root_len = git_path_root(make_path.ptr); - if (root < min_root_len) - root = min_root_len; - while (root >= 0 && make_path.ptr[root] == '/') - ++root; - - /* clip root to make_path length */ - if (root > (ssize_t)make_path.size) - root = (ssize_t)make_path.size; /* i.e. NUL byte of string */ - if (root < 0) - root = 0; - - /* walk down tail of path making each directory */ - for (tail = &make_path.ptr[root]; *tail; *tail = lastch) { - bool mkdir_attempted = false; - - /* advance tail to include next path component */ - while (*tail == '/') - tail++; - while (*tail && *tail != '/') - tail++; - - /* truncate path at next component */ - lastch = *tail; - *tail = '\0'; - st.st_mode = 0; - - if (opts->dir_map && git_strmap_exists(opts->dir_map, make_path.ptr)) - continue; - - /* See what's going on with this path component */ - opts->perfdata.stat_calls++; - -retry_lstat: - if (p_lstat(make_path.ptr, &st) < 0) { - if (mkdir_attempted || errno != ENOENT) { - git_error_set(GIT_ERROR_OS, "cannot access component in path '%s'", make_path.ptr); - error = -1; - goto done; - } - - git_error_clear(); - opts->perfdata.mkdir_calls++; - mkdir_attempted = true; - if (p_mkdir(make_path.ptr, mode) < 0) { - if (errno == EEXIST) - goto retry_lstat; - git_error_set(GIT_ERROR_OS, "failed to make directory '%s'", make_path.ptr); - error = -1; - goto done; - } - } else { - if ((error = mkdir_validate_dir( - make_path.ptr, &st, mode, flags, opts)) < 0) - goto done; - } - - /* chmod if requested and necessary */ - if ((error = mkdir_validate_mode( - make_path.ptr, &st, (lastch == '\0'), mode, flags, opts)) < 0) - goto done; - - if (opts->dir_map && opts->pool) { - char *cache_path; - size_t alloc_size; - - GIT_ERROR_CHECK_ALLOC_ADD(&alloc_size, make_path.size, 1); - cache_path = git_pool_malloc(opts->pool, alloc_size); - GIT_ERROR_CHECK_ALLOC(cache_path); - - memcpy(cache_path, make_path.ptr, make_path.size + 1); - - if ((error = git_strmap_set(opts->dir_map, cache_path, cache_path)) < 0) - goto done; - } - } - - error = 0; - - /* check that full path really is a directory if requested & needed */ - if ((flags & GIT_MKDIR_VERIFY_DIR) != 0 && - lastch != '\0') { - opts->perfdata.stat_calls++; - - if (p_stat(make_path.ptr, &st) < 0 || !S_ISDIR(st.st_mode)) { - git_error_set(GIT_ERROR_OS, "path is not a directory '%s'", - make_path.ptr); - error = GIT_ENOTFOUND; - } - } - -done: - git_buf_dispose(&make_path); - return error; -} - -typedef struct { - const char *base; - size_t baselen; - uint32_t flags; - int depth; -} futils__rmdir_data; - -#define FUTILS_MAX_DEPTH 100 - -static int futils__error_cannot_rmdir(const char *path, const char *filemsg) -{ - if (filemsg) - git_error_set(GIT_ERROR_OS, "could not remove directory '%s': %s", - path, filemsg); - else - git_error_set(GIT_ERROR_OS, "could not remove directory '%s'", path); - - return -1; -} - -static int futils__rm_first_parent(git_buf *path, const char *ceiling) -{ - int error = GIT_ENOTFOUND; - struct stat st; - - while (error == GIT_ENOTFOUND) { - git_buf_rtruncate_at_char(path, '/'); - - if (!path->size || git__prefixcmp(path->ptr, ceiling) != 0) - error = 0; - else if (p_lstat_posixly(path->ptr, &st) == 0) { - if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)) - error = p_unlink(path->ptr); - else if (!S_ISDIR(st.st_mode)) - error = -1; /* fail to remove non-regular file */ - } else if (errno != ENOTDIR) - error = -1; - } - - if (error) - futils__error_cannot_rmdir(path->ptr, "cannot remove parent"); - - return error; -} - -static int futils__rmdir_recurs_foreach(void *opaque, git_buf *path) -{ - int error = 0; - futils__rmdir_data *data = opaque; - struct stat st; - - if (data->depth > FUTILS_MAX_DEPTH) - error = futils__error_cannot_rmdir( - path->ptr, "directory nesting too deep"); - - else if ((error = p_lstat_posixly(path->ptr, &st)) < 0) { - if (errno == ENOENT) - error = 0; - else if (errno == ENOTDIR) { - /* asked to remove a/b/c/d/e and a/b is a normal file */ - if ((data->flags & GIT_RMDIR_REMOVE_BLOCKERS) != 0) - error = futils__rm_first_parent(path, data->base); - else - futils__error_cannot_rmdir( - path->ptr, "parent is not directory"); - } - else - error = git_path_set_error(errno, path->ptr, "rmdir"); - } - - else if (S_ISDIR(st.st_mode)) { - data->depth++; - - error = git_path_direach(path, 0, futils__rmdir_recurs_foreach, data); - - data->depth--; - - if (error < 0) - return error; - - if (data->depth == 0 && (data->flags & GIT_RMDIR_SKIP_ROOT) != 0) - return error; - - if ((error = p_rmdir(path->ptr)) < 0) { - if ((data->flags & GIT_RMDIR_SKIP_NONEMPTY) != 0 && - (errno == ENOTEMPTY || errno == EEXIST || errno == EBUSY)) - error = 0; - else - error = git_path_set_error(errno, path->ptr, "rmdir"); - } - } - - else if ((data->flags & GIT_RMDIR_REMOVE_FILES) != 0) { - if (p_unlink(path->ptr) < 0) - error = git_path_set_error(errno, path->ptr, "remove"); - } - - else if ((data->flags & GIT_RMDIR_SKIP_NONEMPTY) == 0) - error = futils__error_cannot_rmdir(path->ptr, "still present"); - - return error; -} - -static int futils__rmdir_empty_parent(void *opaque, const char *path) -{ - futils__rmdir_data *data = opaque; - int error = 0; - - if (strlen(path) <= data->baselen) - error = GIT_ITEROVER; - - else if (p_rmdir(path) < 0) { - int en = errno; - - if (en == ENOENT || en == ENOTDIR) { - /* do nothing */ - } else if ((data->flags & GIT_RMDIR_SKIP_NONEMPTY) == 0 && - en == EBUSY) { - error = git_path_set_error(errno, path, "rmdir"); - } else if (en == ENOTEMPTY || en == EEXIST || en == EBUSY) { - error = GIT_ITEROVER; - } else { - error = git_path_set_error(errno, path, "rmdir"); - } - } - - return error; -} - -int git_futils_rmdir_r( - const char *path, const char *base, uint32_t flags) -{ - int error; - git_buf fullpath = GIT_BUF_INIT; - futils__rmdir_data data; - - /* build path and find "root" where we should start calling mkdir */ - if (git_path_join_unrooted(&fullpath, path, base, NULL) < 0) - return -1; - - memset(&data, 0, sizeof(data)); - data.base = base ? base : ""; - data.baselen = base ? strlen(base) : 0; - data.flags = flags; - - error = futils__rmdir_recurs_foreach(&data, &fullpath); - - /* remove now-empty parents if requested */ - if (!error && (flags & GIT_RMDIR_EMPTY_PARENTS) != 0) - error = git_path_walk_up( - &fullpath, base, futils__rmdir_empty_parent, &data); - - if (error == GIT_ITEROVER) { - git_error_clear(); - error = 0; - } - - git_buf_dispose(&fullpath); - - return error; -} - -int git_futils_fake_symlink(const char *target, const char *path) -{ - int retcode = GIT_ERROR; - int fd = git_futils_creat_withpath(path, 0755, 0644); - if (fd >= 0) { - retcode = p_write(fd, target, strlen(target)); - p_close(fd); - } - return retcode; -} - -static int cp_by_fd(int ifd, int ofd, bool close_fd_when_done) -{ - int error = 0; - char buffer[FILEIO_BUFSIZE]; - ssize_t len = 0; - - while (!error && (len = p_read(ifd, buffer, sizeof(buffer))) > 0) - /* p_write() does not have the same semantics as write(). It loops - * internally and will return 0 when it has completed writing. - */ - error = p_write(ofd, buffer, len); - - if (len < 0) { - git_error_set(GIT_ERROR_OS, "read error while copying file"); - error = (int)len; - } - - if (error < 0) - git_error_set(GIT_ERROR_OS, "write error while copying file"); - - if (close_fd_when_done) { - p_close(ifd); - p_close(ofd); - } - - return error; -} - -int git_futils_cp(const char *from, const char *to, mode_t filemode) -{ - int ifd, ofd; - - if ((ifd = git_futils_open_ro(from)) < 0) - return ifd; - - if ((ofd = p_open(to, O_WRONLY | O_CREAT | O_EXCL, filemode)) < 0) { - p_close(ifd); - return git_path_set_error(errno, to, "open for writing"); - } - - return cp_by_fd(ifd, ofd, true); -} - -int git_futils_touch(const char *path, time_t *when) -{ - struct p_timeval times[2]; - int ret; - - times[0].tv_sec = times[1].tv_sec = when ? *when : time(NULL); - times[0].tv_usec = times[1].tv_usec = 0; - - ret = p_utimes(path, times); - - return (ret < 0) ? git_path_set_error(errno, path, "touch") : 0; -} - -static int cp_link(const char *from, const char *to, size_t link_size) -{ - int error = 0; - ssize_t read_len; - char *link_data; - size_t alloc_size; - - GIT_ERROR_CHECK_ALLOC_ADD(&alloc_size, link_size, 1); - link_data = git__malloc(alloc_size); - GIT_ERROR_CHECK_ALLOC(link_data); - - read_len = p_readlink(from, link_data, link_size); - if (read_len != (ssize_t)link_size) { - git_error_set(GIT_ERROR_OS, "failed to read symlink data for '%s'", from); - error = -1; - } - else { - link_data[read_len] = '\0'; - - if (p_symlink(link_data, to) < 0) { - git_error_set(GIT_ERROR_OS, "could not symlink '%s' as '%s'", - link_data, to); - error = -1; - } - } - - git__free(link_data); - return error; -} - -typedef struct { - const char *to_root; - git_buf to; - ssize_t from_prefix; - uint32_t flags; - uint32_t mkdir_flags; - mode_t dirmode; -} cp_r_info; - -#define GIT_CPDIR__MKDIR_DONE_FOR_TO_ROOT (1u << 10) - -static int _cp_r_mkdir(cp_r_info *info, git_buf *from) -{ - int error = 0; - - /* create root directory the first time we need to create a directory */ - if ((info->flags & GIT_CPDIR__MKDIR_DONE_FOR_TO_ROOT) == 0) { - error = git_futils_mkdir( - info->to_root, info->dirmode, - (info->flags & GIT_CPDIR_CHMOD_DIRS) ? GIT_MKDIR_CHMOD : 0); - - info->flags |= GIT_CPDIR__MKDIR_DONE_FOR_TO_ROOT; - } - - /* create directory with root as base to prevent excess chmods */ - if (!error) - error = git_futils_mkdir_relative( - from->ptr + info->from_prefix, info->to_root, - info->dirmode, info->mkdir_flags, NULL); - - return error; -} - -static int _cp_r_callback(void *ref, git_buf *from) -{ - int error = 0; - cp_r_info *info = ref; - struct stat from_st, to_st; - bool exists = false; - - if ((info->flags & GIT_CPDIR_COPY_DOTFILES) == 0 && - from->ptr[git_path_basename_offset(from)] == '.') - return 0; - - if ((error = git_buf_joinpath( - &info->to, info->to_root, from->ptr + info->from_prefix)) < 0) - return error; - - if (!(error = git_path_lstat(info->to.ptr, &to_st))) - exists = true; - else if (error != GIT_ENOTFOUND) - return error; - else { - git_error_clear(); - error = 0; - } - - if ((error = git_path_lstat(from->ptr, &from_st)) < 0) - return error; - - if (S_ISDIR(from_st.st_mode)) { - mode_t oldmode = info->dirmode; - - /* if we are not chmod'ing, then overwrite dirmode */ - if ((info->flags & GIT_CPDIR_CHMOD_DIRS) == 0) - info->dirmode = from_st.st_mode; - - /* make directory now if CREATE_EMPTY_DIRS is requested and needed */ - if (!exists && (info->flags & GIT_CPDIR_CREATE_EMPTY_DIRS) != 0) - error = _cp_r_mkdir(info, from); - - /* recurse onto target directory */ - if (!error && (!exists || S_ISDIR(to_st.st_mode))) - error = git_path_direach(from, 0, _cp_r_callback, info); - - if (oldmode != 0) - info->dirmode = oldmode; - - return error; - } - - if (exists) { - if ((info->flags & GIT_CPDIR_OVERWRITE) == 0) - return 0; - - if (p_unlink(info->to.ptr) < 0) { - git_error_set(GIT_ERROR_OS, "cannot overwrite existing file '%s'", - info->to.ptr); - return GIT_EEXISTS; - } - } - - /* Done if this isn't a regular file or a symlink */ - if (!S_ISREG(from_st.st_mode) && - (!S_ISLNK(from_st.st_mode) || - (info->flags & GIT_CPDIR_COPY_SYMLINKS) == 0)) - return 0; - - /* Make container directory on demand if needed */ - if ((info->flags & GIT_CPDIR_CREATE_EMPTY_DIRS) == 0 && - (error = _cp_r_mkdir(info, from)) < 0) - return error; - - /* make symlink or regular file */ - if (info->flags & GIT_CPDIR_LINK_FILES) { - if ((error = p_link(from->ptr, info->to.ptr)) < 0) - git_error_set(GIT_ERROR_OS, "failed to link '%s'", from->ptr); - } else if (S_ISLNK(from_st.st_mode)) { - error = cp_link(from->ptr, info->to.ptr, (size_t)from_st.st_size); - } else { - mode_t usemode = from_st.st_mode; - - if ((info->flags & GIT_CPDIR_SIMPLE_TO_MODE) != 0) - usemode = GIT_PERMS_FOR_WRITE(usemode); - - error = git_futils_cp(from->ptr, info->to.ptr, usemode); - } - - return error; -} - -int git_futils_cp_r( - const char *from, - const char *to, - uint32_t flags, - mode_t dirmode) -{ - int error; - git_buf path = GIT_BUF_INIT; - cp_r_info info; - - if (git_buf_joinpath(&path, from, "") < 0) /* ensure trailing slash */ - return -1; - - memset(&info, 0, sizeof(info)); - info.to_root = to; - info.flags = flags; - info.dirmode = dirmode; - info.from_prefix = path.size; - git_buf_init(&info.to, 0); - - /* precalculate mkdir flags */ - if ((flags & GIT_CPDIR_CREATE_EMPTY_DIRS) == 0) { - /* if not creating empty dirs, then use mkdir to create the path on - * demand right before files are copied. - */ - info.mkdir_flags = GIT_MKDIR_PATH | GIT_MKDIR_SKIP_LAST; - if ((flags & GIT_CPDIR_CHMOD_DIRS) != 0) - info.mkdir_flags |= GIT_MKDIR_CHMOD_PATH; - } else { - /* otherwise, we will do simple mkdir as directories are encountered */ - info.mkdir_flags = - ((flags & GIT_CPDIR_CHMOD_DIRS) != 0) ? GIT_MKDIR_CHMOD : 0; - } - - error = _cp_r_callback(&info, &path); - - git_buf_dispose(&path); - git_buf_dispose(&info.to); - - return error; -} - -int git_futils_filestamp_check( - git_futils_filestamp *stamp, const char *path) -{ - struct stat st; - - /* if the stamp is NULL, then always reload */ - if (stamp == NULL) - return 1; - - if (p_stat(path, &st) < 0) - return GIT_ENOTFOUND; - - if (stamp->mtime.tv_sec == st.st_mtime && -#if defined(GIT_USE_NSEC) - stamp->mtime.tv_nsec == st.st_mtime_nsec && -#endif - stamp->size == (uint64_t)st.st_size && - stamp->ino == (unsigned int)st.st_ino) - return 0; - - stamp->mtime.tv_sec = st.st_mtime; -#if defined(GIT_USE_NSEC) - stamp->mtime.tv_nsec = st.st_mtime_nsec; -#endif - stamp->size = (uint64_t)st.st_size; - stamp->ino = (unsigned int)st.st_ino; - - return 1; -} - -void git_futils_filestamp_set( - git_futils_filestamp *target, const git_futils_filestamp *source) -{ - if (source) - memcpy(target, source, sizeof(*target)); - else - memset(target, 0, sizeof(*target)); -} - - -void git_futils_filestamp_set_from_stat( - git_futils_filestamp *stamp, struct stat *st) -{ - if (st) { - stamp->mtime.tv_sec = st->st_mtime; -#if defined(GIT_USE_NSEC) - stamp->mtime.tv_nsec = st->st_mtime_nsec; -#else - stamp->mtime.tv_nsec = 0; -#endif - stamp->size = (uint64_t)st->st_size; - stamp->ino = (unsigned int)st->st_ino; - } else { - memset(stamp, 0, sizeof(*stamp)); - } -} - -int git_futils_fsync_dir(const char *path) -{ -#ifdef GIT_WIN32 - GIT_UNUSED(path); - return 0; -#else - int fd, error = -1; - - if ((fd = p_open(path, O_RDONLY)) < 0) { - git_error_set(GIT_ERROR_OS, "failed to open directory '%s' for fsync", path); - return -1; - } - - if ((error = p_fsync(fd)) < 0) - git_error_set(GIT_ERROR_OS, "failed to fsync directory '%s'", path); - - p_close(fd); - return error; -#endif -} - -int git_futils_fsync_parent(const char *path) -{ - char *parent; - int error; - - if ((parent = git_path_dirname(path)) == NULL) - return -1; - - error = git_futils_fsync_dir(parent); - git__free(parent); - return error; -} |