#include "cache.h"

#include "run-command.h"

#include "sigchain.h"

#include "connected.h"

#include "transport.h"

#include "packfile.h"

/*

 * If we feed all the commits we want to verify to this command

 *

 *  $ git rev-list --objects --stdin --not --all

 *

 * and if it does not error out, that means everything reachable from

 * these commits locally exists and is connected to our existing refs.

 * Note that this does _not_ validate the individual objects.

 *

 * Returns 0 if everything is connected, non-zero otherwise.

 */

int check_connected(oid_iterate_fn fn, void *cb_data,

		    struct check_connected_options *opt)

{

	struct child_process rev_list = CHILD_PROCESS_INIT;

	struct check_connected_options defaults = CHECK_CONNECTED_INIT;

	char commit[GIT_MAX_HEXSZ + 1];

	struct object_id oid;

	int err = 0;

	struct packed_git *new_pack = NULL;

	struct transport *transport;

	size_t base_len;

	if (!opt)

		opt = &defaults;

	transport = opt->transport;

	if (fn(cb_data, &oid)) {

		if (opt->err_fd)

			close(opt->err_fd);

		return err;

	}

	if (transport && transport->smart_options &&

	    transport->smart_options->self_contained_and_connected &&

	    transport->pack_lockfile &&

	    strip_suffix(transport->pack_lockfile, ".keep", &base_len)) {

		struct strbuf idx_file = STRBUF_INIT;

		strbuf_add(&idx_file, transport->pack_lockfile, base_len);

		strbuf_addstr(&idx_file, ".idx");

		new_pack = add_packed_git(idx_file.buf, idx_file.len, 1);

		strbuf_release(&idx_file);

	}

	if (opt->shallow_file) {

		argv_array_push(&rev_list.args, "--shallow-file");

		argv_array_push(&rev_list.args, opt->shallow_file);

	}

	argv_array_push(&rev_list.args,"rev-list");

	argv_array_push(&rev_list.args, "--objects");

	argv_array_push(&rev_list.args, "--stdin");

	if (repository_format_partial_clone)

		argv_array_push(&rev_list.args, "--exclude-promisor-objects");

	argv_array_push(&rev_list.args, "--not");

	argv_array_push(&rev_list.args, "--all");

	argv_array_push(&rev_list.args, "--quiet");

	if (opt->progress)

		argv_array_pushf(&rev_list.args, "--progress=%s",

				 _("Checking connectivity"));

	rev_list.git_cmd = 1;

	rev_list.env = opt->env;

	rev_list.in = -1;

	rev_list.no_stdout = 1;

	if (opt->err_fd)

		rev_list.err = opt->err_fd;

	else

		rev_list.no_stderr = opt->quiet;

	if (start_command(&rev_list))

		return error(_("Could not run 'git rev-list'"));

	sigchain_push(SIGPIPE, SIG_IGN);

	commit[GIT_SHA1_HEXSZ] = '\n';

	do {

		/*

		 * If index-pack already checked that:

		 * - there are no dangling pointers in the new pack

		 * - the pack is self contained

		 * Then if the updated ref is in the new pack, then we

		 * are sure the ref is good and not sending it to

		 * rev-list for verification.

		 */

		if (new_pack && find_pack_entry_one(oid.hash, new_pack))

			continue;

		memcpy(commit, oid_to_hex(&oid), GIT_SHA1_HEXSZ);

		if (write_in_full(rev_list.in, commit, GIT_SHA1_HEXSZ + 1) < 0) {

			if (errno != EPIPE && errno != EINVAL)

				error_errno(_("failed write to rev-list"));

			err = -1;

			break;

		}

	} while (!fn(cb_data, &oid));

	if (close(rev_list.in))

		err = error_errno(_("failed to close rev-list's stdin"));

	sigchain_pop(SIGPIPE);

	return finish_command(&rev_list) || err;

}