Adding upstream version 1.7.2+ds.upstream/1.7.2+ds

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 248 insertions, 0 deletions

diff --git a/examples/init.c b/examples/init.c
new file mode 100644
index 0000000..2f681c5
--- /dev/null
+++ b/examples/init.c
@@ -0,0 +1,248 @@
+/*
+ * 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 init_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 init_opts *o, int argc, char *argv[]);
+
+int lg2_init(git_repository *repo, int argc, char *argv[])
+{
+	struct init_opts o = { 1, 0, 0, 0, GIT_REPOSITORY_INIT_SHARED_UMASK, 0, 0, 0 };
+
+	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);
+
+	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 init_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", "");
+}