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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 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_libgit2_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_libgit2_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);

}

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