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/*
* 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.
*
* 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 <stdio.h>
#include <git2.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
/* not actually good error handling */
static void fail(const char *msg, const char *arg)
{
if (arg)
fprintf(stderr, "%s %s\n", msg, arg);
else
fprintf(stderr, "%s\n", msg);
exit(1);
}
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>] [--shared[=perms]] <directory>\n");
exit(1);
}
/* simple string prefix test used in argument parsing */
static size_t is_prefixed(const char *arg, const char *pfx)
{
size_t len = strlen(pfx);
return !strncmp(arg, pfx, len) ? len : 0;
}
/* 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;
}
/* forward declaration of helper to make an empty parent-less commit */
static void create_initial_commit(git_repository *repo);
int main(int argc, char *argv[])
{
git_repository *repo = NULL;
int no_options = 1, quiet = 0, bare = 0, initial_commit = 0, i;
uint32_t shared = GIT_REPOSITORY_INIT_SHARED_UMASK;
const char *template = NULL, *gitdir = NULL, *dir = NULL;
size_t pfxlen;
git_threads_init();
/* Process arguments */
for (i = 1; i < argc; ++i) {
char *a = argv[i];
if (a[0] == '-')
no_options = 0;
if (a[0] != '-') {
if (dir != NULL)
usage("extra argument", a);
dir = a;
}
else if (!strcmp(a, "-q") || !strcmp(a, "--quiet"))
quiet = 1;
else if (!strcmp(a, "--bare"))
bare = 1;
else if ((pfxlen = is_prefixed(a, "--template=")) > 0)
template = a + pfxlen;
else if (!strcmp(a, "--separate-git-dir"))
gitdir = argv[++i];
else if ((pfxlen = is_prefixed(a, "--separate-git-dir=")) > 0)
gitdir = a + pfxlen;
else if (!strcmp(a, "--shared"))
shared = GIT_REPOSITORY_INIT_SHARED_GROUP;
else if ((pfxlen = is_prefixed(a, "--shared=")) > 0)
shared = parse_shared(a + pfxlen);
else if (!strcmp(a, "--initial-commit"))
initial_commit = 1;
else
usage("unknown option", a);
}
if (!dir)
usage("must specify directory to init", NULL);
/* Initialize repository */
if (no_options) {
/* No options were specified, so let's demonstrate the default
* simple case of git_repository_init() API usage...
*/
if (git_repository_init(&repo, dir, 0) < 0)
fail("Could not initialize repository", dir);
}
else {
/* Some command line options were specified, so we'll use the
* extended init API to handle them
*/
git_repository_init_options opts = GIT_REPOSITORY_INIT_OPTIONS_INIT;
if (bare)
opts.flags |= GIT_REPOSITORY_INIT_BARE;
if (template) {
opts.flags |= GIT_REPOSITORY_INIT_EXTERNAL_TEMPLATE;
opts.template_path = template;
}
if (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)
*/
opts.workdir_path = dir;
dir = gitdir;
}
if (shared != 0)
opts.mode = shared;
if (git_repository_init_ext(&repo, dir, &opts) < 0)
fail("Could not initialize repository", dir);
}
/* Print a message to stdout like "git init" does */
if (!quiet) {
if (bare || gitdir)
dir = git_repository_path(repo);
else
dir = git_repository_workdir(repo);
printf("Initialized empty Git repository in %s\n", 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 (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)
fail("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)
fail("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)
fail("Unable to write initial tree from index", NULL);
git_index_free(index);
if (git_tree_lookup(&tree, repo, &tree_id) < 0)
fail("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)
fail("Could not create the initial commit", NULL);
/* Clean up so we don't leak memory */
git_tree_free(tree);
git_signature_free(sig);
}
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