summaryrefslogtreecommitdiff
path: root/examples/init.c
diff options
context:
space:
mode:
Diffstat (limited to 'examples/init.c')
-rw-r--r--examples/init.c253
1 files changed, 253 insertions, 0 deletions
diff --git a/examples/init.c b/examples/init.c
new file mode 100644
index 000000000..0e823ab81
--- /dev/null
+++ b/examples/init.c
@@ -0,0 +1,253 @@
+/*
+ * libgit2 "init" example - shows how to initialize a new repo
+ *
+ * Written by the libgit2 contributors
+ *
+ * To the extent possible under law, the author(s) have dedicated all copyright
+ * and related and neighboring rights to this software to the public domain
+ * worldwide. This software is distributed without any warranty.
+ *
+ * You should have received a copy of the CC0 Public Domain Dedication along
+ * with this software. If not, see
+ * <http://creativecommons.org/publicdomain/zero/1.0/>.
+ */
+
+#include "common.h"
+
+/**
+ * This is a sample program that is similar to "git init". See the
+ * documentation for that (try "git help init") to understand what this
+ * program is emulating.
+ *
+ * This demonstrates using the libgit2 APIs to initialize a new repository.
+ *
+ * This also contains a special additional option that regular "git init"
+ * does not support which is "--initial-commit" to make a first empty commit.
+ * That is demonstrated in the "create_initial_commit" helper function.
+ */
+
+/** Forward declarations of helpers */
+struct opts {
+ int no_options;
+ int quiet;
+ int bare;
+ int initial_commit;
+ uint32_t shared;
+ const char *template;
+ const char *gitdir;
+ const char *dir;
+};
+static void create_initial_commit(git_repository *repo);
+static void parse_opts(struct opts *o, int argc, char *argv[]);
+
+
+int main(int argc, char *argv[])
+{
+ git_repository *repo = NULL;
+ struct opts o = { 1, 0, 0, 0, GIT_REPOSITORY_INIT_SHARED_UMASK, 0, 0, 0 };
+
+ git_threads_init();
+
+ parse_opts(&o, argc, argv);
+
+ /* Initialize repository. */
+
+ if (o.no_options) {
+ /**
+ * No options were specified, so let's demonstrate the default
+ * simple case of git_repository_init() API usage...
+ */
+ check_lg2(git_repository_init(&repo, o.dir, 0),
+ "Could not initialize repository", NULL);
+ }
+ else {
+ /**
+ * Some command line options were specified, so we'll use the
+ * extended init API to handle them
+ */
+ git_repository_init_options initopts = GIT_REPOSITORY_INIT_OPTIONS_INIT;
+ initopts.flags = GIT_REPOSITORY_INIT_MKPATH;
+
+ if (o.bare)
+ initopts.flags |= GIT_REPOSITORY_INIT_BARE;
+
+ if (o.template) {
+ initopts.flags |= GIT_REPOSITORY_INIT_EXTERNAL_TEMPLATE;
+ initopts.template_path = o.template;
+ }
+
+ if (o.gitdir) {
+ /**
+ * If you specified a separate git directory, then initialize
+ * the repository at that path and use the second path as the
+ * working directory of the repository (with a git-link file)
+ */
+ initopts.workdir_path = o.dir;
+ o.dir = o.gitdir;
+ }
+
+ if (o.shared != 0)
+ initopts.mode = o.shared;
+
+ check_lg2(git_repository_init_ext(&repo, o.dir, &initopts),
+ "Could not initialize repository", NULL);
+ }
+
+ /** Print a message to stdout like "git init" does. */
+
+ if (!o.quiet) {
+ if (o.bare || o.gitdir)
+ o.dir = git_repository_path(repo);
+ else
+ o.dir = git_repository_workdir(repo);
+
+ printf("Initialized empty Git repository in %s\n", o.dir);
+ }
+
+ /**
+ * As an extension to the basic "git init" command, this example
+ * gives the option to create an empty initial commit. This is
+ * mostly to demonstrate what it takes to do that, but also some
+ * people like to have that empty base commit in their repo.
+ */
+ if (o.initial_commit) {
+ create_initial_commit(repo);
+ printf("Created empty initial commit\n");
+ }
+
+ git_repository_free(repo);
+ git_threads_shutdown();
+
+ return 0;
+}
+
+/**
+ * Unlike regular "git init", this example shows how to create an initial
+ * empty commit in the repository. This is the helper function that does
+ * that.
+ */
+static void create_initial_commit(git_repository *repo)
+{
+ git_signature *sig;
+ git_index *index;
+ git_oid tree_id, commit_id;
+ git_tree *tree;
+
+ /** First use the config to initialize a commit signature for the user. */
+
+ if (git_signature_default(&sig, repo) < 0)
+ fatal("Unable to create a commit signature.",
+ "Perhaps 'user.name' and 'user.email' are not set");
+
+ /* Now let's create an empty tree for this commit */
+
+ if (git_repository_index(&index, repo) < 0)
+ fatal("Could not open repository index", NULL);
+
+ /**
+ * Outside of this example, you could call git_index_add_bypath()
+ * here to put actual files into the index. For our purposes, we'll
+ * leave it empty for now.
+ */
+
+ if (git_index_write_tree(&tree_id, index) < 0)
+ fatal("Unable to write initial tree from index", NULL);
+
+ git_index_free(index);
+
+ if (git_tree_lookup(&tree, repo, &tree_id) < 0)
+ fatal("Could not look up initial tree", NULL);
+
+ /**
+ * Ready to create the initial commit.
+ *
+ * Normally creating a commit would involve looking up the current
+ * HEAD commit and making that be the parent of the initial commit,
+ * but here this is the first commit so there will be no parent.
+ */
+
+ if (git_commit_create_v(
+ &commit_id, repo, "HEAD", sig, sig,
+ NULL, "Initial commit", tree, 0) < 0)
+ fatal("Could not create the initial commit", NULL);
+
+ /** Clean up so we don't leak memory. */
+
+ git_tree_free(tree);
+ git_signature_free(sig);
+}
+
+static void usage(const char *error, const char *arg)
+{
+ fprintf(stderr, "error: %s '%s'\n", error, arg);
+ fprintf(stderr,
+ "usage: init [-q | --quiet] [--bare] [--template=<dir>]\n"
+ " [--shared[=perms]] [--initial-commit]\n"
+ " [--separate-git-dir] <directory>\n");
+ exit(1);
+}
+
+/** Parse the tail of the --shared= argument. */
+static uint32_t parse_shared(const char *shared)
+{
+ if (!strcmp(shared, "false") || !strcmp(shared, "umask"))
+ return GIT_REPOSITORY_INIT_SHARED_UMASK;
+
+ else if (!strcmp(shared, "true") || !strcmp(shared, "group"))
+ return GIT_REPOSITORY_INIT_SHARED_GROUP;
+
+ else if (!strcmp(shared, "all") || !strcmp(shared, "world") ||
+ !strcmp(shared, "everybody"))
+ return GIT_REPOSITORY_INIT_SHARED_ALL;
+
+ else if (shared[0] == '0') {
+ long val;
+ char *end = NULL;
+ val = strtol(shared + 1, &end, 8);
+ if (end == shared + 1 || *end != 0)
+ usage("invalid octal value for --shared", shared);
+ return (uint32_t)val;
+ }
+
+ else
+ usage("unknown value for --shared", shared);
+
+ return 0;
+}
+
+static void parse_opts(struct opts *o, int argc, char *argv[])
+{
+ struct args_info args = ARGS_INFO_INIT;
+ const char *sharedarg;
+
+ /** Process arguments. */
+
+ for (args.pos = 1; args.pos < argc; ++args.pos) {
+ char *a = argv[args.pos];
+
+ if (a[0] == '-')
+ o->no_options = 0;
+
+ if (a[0] != '-') {
+ if (o->dir != NULL)
+ usage("extra argument", a);
+ o->dir = a;
+ }
+ else if (!strcmp(a, "-q") || !strcmp(a, "--quiet"))
+ o->quiet = 1;
+ else if (!strcmp(a, "--bare"))
+ o->bare = 1;
+ else if (!strcmp(a, "--shared"))
+ o->shared = GIT_REPOSITORY_INIT_SHARED_GROUP;
+ else if (!strcmp(a, "--initial-commit"))
+ o->initial_commit = 1;
+ else if (match_str_arg(&sharedarg, &args, "--shared"))
+ o->shared = parse_shared(sharedarg);
+ else if (!match_str_arg(&o->template, &args, "--template") ||
+ !match_str_arg(&o->gitdir, &args, "--separate-git-dir"))
+ usage("unknown option", a);
+ }
+
+ if (!o->dir)
+ usage("must specify directory to init", NULL);
+}