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/*
* 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 lg2_init(git_repository *repo, int argc, char *argv[])
{
struct 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 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", "");
}
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