git

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#define USE_THE_REPOSITORY_VARIABLE
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#include "git-compat-util.h"
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#include "gettext.h"
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#include "hex.h"
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#include "object-store-ll.h"
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#include "run-command.h"
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#include "sigchain.h"
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#include "connected.h"
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#include "transport.h"
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#include "packfile.h"
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#include "promisor-remote.h"
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/*
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 * If we feed all the commits we want to verify to this command
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 *
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 *  $ git rev-list --objects --stdin --not --all
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 *
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 * and if it does not error out, that means everything reachable from
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 * these commits locally exists and is connected to our existing refs.
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 * Note that this does _not_ validate the individual objects.
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 *
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 * Returns 0 if everything is connected, non-zero otherwise.
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 */
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int check_connected(oid_iterate_fn fn, void *cb_data,
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		    struct check_connected_options *opt)
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{
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	struct child_process rev_list = CHILD_PROCESS_INIT;
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	FILE *rev_list_in;
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	struct check_connected_options defaults = CHECK_CONNECTED_INIT;
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	const struct object_id *oid;
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	int err = 0;
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	struct packed_git *new_pack = NULL;
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	struct transport *transport;
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	size_t base_len;
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	if (!opt)
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		opt = &defaults;
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	transport = opt->transport;
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	oid = fn(cb_data);
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	if (!oid) {
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		if (opt->err_fd)
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			close(opt->err_fd);
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		return err;
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	}
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	if (transport && transport->smart_options &&
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	    transport->smart_options->self_contained_and_connected &&
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	    transport->pack_lockfiles.nr == 1 &&
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	    strip_suffix(transport->pack_lockfiles.items[0].string,
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			 ".keep", &base_len)) {
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		struct strbuf idx_file = STRBUF_INIT;
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		strbuf_add(&idx_file, transport->pack_lockfiles.items[0].string,
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			   base_len);
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		strbuf_addstr(&idx_file, ".idx");
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		new_pack = add_packed_git(idx_file.buf, idx_file.len, 1);
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		strbuf_release(&idx_file);
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	}
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	if (repo_has_promisor_remote(the_repository)) {
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		/*
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		 * For partial clones, we don't want to have to do a regular
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		 * connectivity check because we have to enumerate and exclude
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		 * all promisor objects (slow), and then the connectivity check
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		 * itself becomes a no-op because in a partial clone every
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		 * object is a promisor object. Instead, just make sure we
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		 * received, in a promisor packfile, the objects pointed to by
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		 * each wanted ref.
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		 *
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		 * Before checking for promisor packs, be sure we have the
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		 * latest pack-files loaded into memory.
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		 */
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		reprepare_packed_git(the_repository);
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		do {
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			struct packed_git *p;
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			for (p = get_all_packs(the_repository); p; p = p->next) {
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				if (!p->pack_promisor)
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					continue;
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				if (find_pack_entry_one(oid->hash, p))
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					goto promisor_pack_found;
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			}
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			/*
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			 * Fallback to rev-list with oid and the rest of the
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			 * object IDs provided by fn.
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			 */
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			goto no_promisor_pack_found;
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promisor_pack_found:
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			;
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		} while ((oid = fn(cb_data)) != NULL);
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		free(new_pack);
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		return 0;
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	}
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no_promisor_pack_found:
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	if (opt->shallow_file) {
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		strvec_push(&rev_list.args, "--shallow-file");
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		strvec_push(&rev_list.args, opt->shallow_file);
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	}
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	strvec_push(&rev_list.args,"rev-list");
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	strvec_push(&rev_list.args, "--objects");
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	strvec_push(&rev_list.args, "--stdin");
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	if (repo_has_promisor_remote(the_repository))
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		strvec_push(&rev_list.args, "--exclude-promisor-objects");
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	if (!opt->is_deepening_fetch) {
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		strvec_push(&rev_list.args, "--not");
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		if (opt->exclude_hidden_refs_section)
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			strvec_pushf(&rev_list.args, "--exclude-hidden=%s",
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				     opt->exclude_hidden_refs_section);
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		strvec_push(&rev_list.args, "--all");
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	}
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	strvec_push(&rev_list.args, "--quiet");
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	strvec_push(&rev_list.args, "--alternate-refs");
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	if (opt->progress)
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		strvec_pushf(&rev_list.args, "--progress=%s",
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			     _("Checking connectivity"));
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	rev_list.git_cmd = 1;
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	if (opt->env)
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		strvec_pushv(&rev_list.env, opt->env);
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	rev_list.in = -1;
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	rev_list.no_stdout = 1;
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	if (opt->err_fd)
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		rev_list.err = opt->err_fd;
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	else
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		rev_list.no_stderr = opt->quiet;
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	if (start_command(&rev_list)) {
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		free(new_pack);
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		return error(_("Could not run 'git rev-list'"));
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	}
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	sigchain_push(SIGPIPE, SIG_IGN);
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	rev_list_in = xfdopen(rev_list.in, "w");
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	do {
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		/*
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		 * If index-pack already checked that:
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		 * - there are no dangling pointers in the new pack
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		 * - the pack is self contained
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		 * Then if the updated ref is in the new pack, then we
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		 * are sure the ref is good and not sending it to
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		 * rev-list for verification.
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		 */
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		if (new_pack && find_pack_entry_one(oid->hash, new_pack))
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			continue;
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		if (fprintf(rev_list_in, "%s\n", oid_to_hex(oid)) < 0)
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			break;
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	} while ((oid = fn(cb_data)) != NULL);
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	if (ferror(rev_list_in) || fflush(rev_list_in)) {
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		if (errno != EPIPE && errno != EINVAL)
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			error_errno(_("failed write to rev-list"));
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		err = -1;
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	}
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	if (fclose(rev_list_in))
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		err = error_errno(_("failed to close rev-list's stdin"));
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	sigchain_pop(SIGPIPE);
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	free(new_pack);
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	return finish_command(&rev_list) || err;
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}
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