send-pack.c - jrn/git - Git at Google

 #include "cache.h"
 #include "commit.h"
 #include "tag.h"
 #include "refs.h"
 #include "pkt-line.h"
 #include "run-command.h"

 static const char send_pack_usage[] =
 "git-send-pack [--all] [--force] [--receive-pack=<git-receive-pack>] [--verbose] [--thin] [<host>:]<directory> [<ref>...]\n"
 "  --all and explicit <ref> specification are mutually exclusive.";
 static const char *receivepack = "git-receive-pack";
 static int verbose;
 static int send_all;
 static int force_update;
 static int use_thin_pack;

 /*
  * Make a pack stream and spit it out into file descriptor fd
  */
 static int pack_objects(int fd, struct ref *refs)
 {
 	/*
 	 * The child becomes pack-objects --revs; we feed
 	 * the revision parameters to it via its stdin and
 	 * let its stdout go back to the other end.
 	 */
 	const char *args[] = {
 		"pack-objects",
 		"--all-progress",
 		"--revs",
 		"--stdout",
 		NULL,
 		NULL,
 	};
 	struct child_process po;

 	if (use_thin_pack)
 		args[4] = "--thin";
 	memset(&po, 0, sizeof(po));
 	po.argv = args;
 	po.in = -1;
 	po.out = fd;
 	po.git_cmd = 1;
 	if (start_command(&po))
 		die("git-pack-objects failed (%s)", strerror(errno));

 	/*
 	 * We feed the pack-objects we just spawned with revision
 	 * parameters by writing to the pipe.
 	 */
 	while (refs) {
 		char buf[42];

 		if (!is_null_sha1(refs->old_sha1) &&
 		    has_sha1_file(refs->old_sha1)) {
 			memcpy(buf + 1, sha1_to_hex(refs->old_sha1), 40);
 			buf[0] = '^';
 			buf[41] = '\n';
 			if (!write_or_whine(po.in, buf, 42,
 						"send-pack: send refs"))
 				break;
 		}
 		if (!is_null_sha1(refs->new_sha1)) {
 			memcpy(buf, sha1_to_hex(refs->new_sha1), 40);
 			buf[40] = '\n';
 			if (!write_or_whine(po.in, buf, 41,
 						"send-pack: send refs"))
 				break;
 		}
 		refs = refs->next;
 	}

 	if (finish_command(&po))
 		return error("pack-objects died with strange error");
 	return 0;
 }

 static void unmark_and_free(struct commit_list *list, unsigned int mark)
 {
 	while (list) {
 		struct commit_list *temp = list;
 		temp->item->object.flags &= ~mark;
 		list = temp->next;
 		free(temp);
 	}
 }

 static int ref_newer(const unsigned char *new_sha1,
 		     const unsigned char *old_sha1)
 {
 	struct object *o;
 	struct commit *old, *new;
 	struct commit_list *list, *used;
 	int found = 0;

 	/* Both new and old must be commit-ish and new is descendant of
 	 * old.  Otherwise we require --force.
 	 */
 	o = deref_tag(parse_object(old_sha1), NULL, 0);
 	if (!o || o->type != OBJ_COMMIT)
 		return 0;
 	old = (struct commit *) o;

 	o = deref_tag(parse_object(new_sha1), NULL, 0);
 	if (!o || o->type != OBJ_COMMIT)
 		return 0;
 	new = (struct commit *) o;

 	if (parse_commit(new) < 0)
 		return 0;

 	used = list = NULL;
 	commit_list_insert(new, &list);
 	while (list) {
 		new = pop_most_recent_commit(&list, 1);
 		commit_list_insert(new, &used);
 		if (new == old) {
 			found = 1;
 			break;
 		}
 	}
 	unmark_and_free(list, 1);
 	unmark_and_free(used, 1);
 	return found;
 }

 static struct ref *local_refs, **local_tail;
 static struct ref *remote_refs, **remote_tail;

 static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 {
 	struct ref *ref;
 	int len = strlen(refname) + 1;
 	ref = xcalloc(1, sizeof(*ref) + len);
 	hashcpy(ref->new_sha1, sha1);
 	memcpy(ref->name, refname, len);
 	*local_tail = ref;
 	local_tail = &ref->next;
 	return 0;
 }

 static void get_local_heads(void)
 {
 	local_tail = &local_refs;
 	for_each_ref(one_local_ref, NULL);
 }

 static int receive_status(int in)
 {
 	char line[1000];
 	int ret = 0;
 	int len = packet_read_line(in, line, sizeof(line));
 	if (len < 10 || memcmp(line, "unpack ", 7)) {
 		fprintf(stderr, "did not receive status back\n");
 		return -1;
 	}
 	if (memcmp(line, "unpack ok\n", 10)) {
 		fputs(line, stderr);
 		ret = -1;
 	}
 	while (1) {
 		len = packet_read_line(in, line, sizeof(line));
 		if (!len)
 			break;
 		if (len < 3 ||
 		    (memcmp(line, "ok", 2) && memcmp(line, "ng", 2))) {
 			fprintf(stderr, "protocol error: %s\n", line);
 			ret = -1;
 			break;
 		}
 		if (!memcmp(line, "ok", 2))
 			continue;
 		fputs(line, stderr);
 		ret = -1;
 	}
 	return ret;
 }

 static int send_pack(int in, int out, int nr_refspec, char **refspec)
 {
 	struct ref *ref;
 	int new_refs;
 	int ret = 0;
 	int ask_for_status_report = 0;
 	int allow_deleting_refs = 0;
 	int expect_status_report = 0;

 	/* No funny business with the matcher */
 	remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, REF_NORMAL);
 	get_local_heads();

 	/* Does the other end support the reporting? */
 	if (server_supports("report-status"))
 		ask_for_status_report = 1;
 	if (server_supports("delete-refs"))
 		allow_deleting_refs = 1;

 	/* match them up */
 	if (!remote_tail)
 		remote_tail = &remote_refs;
 	if (match_refs(local_refs, remote_refs, &remote_tail,
 		       nr_refspec, refspec, send_all))
 		return -1;

 	if (!remote_refs) {
 		fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
 		return 0;
 	}

 	/*
 	 * Finally, tell the other end!
 	 */
 	new_refs = 0;
 	for (ref = remote_refs; ref; ref = ref->next) {
 		char old_hex[60], *new_hex;
 		int delete_ref;

 		if (!ref->peer_ref)
 			continue;

 		delete_ref = is_null_sha1(ref->peer_ref->new_sha1);
 		if (delete_ref && !allow_deleting_refs) {
 			error("remote does not support deleting refs");
 			ret = -2;
 			continue;
 		}
 		if (!delete_ref &&
 		    !hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
 			if (verbose)
 				fprintf(stderr, "'%s': up-to-date\n", ref->name);
 			continue;
 		}

 		/* This part determines what can overwrite what.
 		 * The rules are:
 		 *
 		 * (0) you can always use --force or +A:B notation to
 		 *     selectively force individual ref pairs.
 		 *
 		 * (1) if the old thing does not exist, it is OK.
 		 *
 		 * (2) if you do not have the old thing, you are not allowed
 		 *     to overwrite it; you would not know what you are losing
 		 *     otherwise.
 		 *
 		 * (3) if both new and old are commit-ish, and new is a
 		 *     descendant of old, it is OK.
 		 *
 		 * (4) regardless of all of the above, removing :B is
 		 *     always allowed.
 		 */

 		if (!force_update &&
 		    !delete_ref &&
 		    !is_null_sha1(ref->old_sha1) &&
 		    !ref->force) {
 			if (!has_sha1_file(ref->old_sha1) ||
 			    !ref_newer(ref->peer_ref->new_sha1,
 				       ref->old_sha1)) {
 				/* We do not have the remote ref, or
 				 * we know that the remote ref is not
 				 * an ancestor of what we are trying to
 				 * push.  Either way this can be losing
 				 * commits at the remote end and likely
 				 * we were not up to date to begin with.
 				 */
 				error("remote '%s' is not a strict "
 				      "subset of local ref '%s'. "
 				      "maybe you are not up-to-date and "
 				      "need to pull first?",
 				      ref->name,
 				      ref->peer_ref->name);
 				ret = -2;
 				continue;
 			}
 		}
 		hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
 		if (!delete_ref)
 			new_refs++;
 		strcpy(old_hex, sha1_to_hex(ref->old_sha1));
 		new_hex = sha1_to_hex(ref->new_sha1);

 		if (ask_for_status_report) {
 			packet_write(out, "%s %s %s%c%s",
 				     old_hex, new_hex, ref->name, 0,
 				     "report-status");
 			ask_for_status_report = 0;
 			expect_status_report = 1;
 		}
 		else
 			packet_write(out, "%s %s %s",
 				     old_hex, new_hex, ref->name);
 		if (delete_ref)
 			fprintf(stderr, "deleting '%s'\n", ref->name);
 		else {
 			fprintf(stderr, "updating '%s'", ref->name);
 			if (strcmp(ref->name, ref->peer_ref->name))
 				fprintf(stderr, " using '%s'",
 					ref->peer_ref->name);
 			fprintf(stderr, "\n  from %s\n  to   %s\n",
 				old_hex, new_hex);
 		}
 	}

 	packet_flush(out);
 	if (new_refs)
 		ret = pack_objects(out, remote_refs);
 	close(out);

 	if (expect_status_report) {
 		if (receive_status(in))
 			ret = -4;
 	}

 	if (!new_refs && ret == 0)
 		fprintf(stderr, "Everything up-to-date\n");
 	return ret;
 }

 static void verify_remote_names(int nr_heads, char **heads)
 {
 	int i;

 	for (i = 0; i < nr_heads; i++) {
 		const char *remote = strchr(heads[i], ':');

 		remote = remote ? (remote + 1) : heads[i];
 		switch (check_ref_format(remote)) {
 		case 0: /* ok */
 		case -2: /* ok but a single level -- that is fine for
 			  * a match pattern.
 			  */
 			continue;
 		}
 		die("remote part of refspec is not a valid name in %s",
 		    heads[i]);
 	}
 }

 int main(int argc, char **argv)
 {
 	int i, nr_heads = 0;
 	char *dest = NULL;
 	char **heads = NULL;
 	int fd[2], ret;
 	pid_t pid;

 	setup_git_directory();
 	git_config(git_default_config);

 	argv++;
 	for (i = 1; i < argc; i++, argv++) {
 		char *arg = *argv;

 		if (*arg == '-') {
 			if (!prefixcmp(arg, "--receive-pack=")) {
 				receivepack = arg + 15;
 				continue;
 			}
 			if (!prefixcmp(arg, "--exec=")) {
 				receivepack = arg + 7;
 				continue;
 			}
 			if (!strcmp(arg, "--all")) {
 				send_all = 1;
 				continue;
 			}
 			if (!strcmp(arg, "--force")) {
 				force_update = 1;
 				continue;
 			}
 			if (!strcmp(arg, "--verbose")) {
 				verbose = 1;
 				continue;
 			}
 			if (!strcmp(arg, "--thin")) {
 				use_thin_pack = 1;
 				continue;
 			}
 			usage(send_pack_usage);
 		}
 		if (!dest) {
 			dest = arg;
 			continue;
 		}
 		heads = argv;
 		nr_heads = argc - i;
 		break;
 	}
 	if (!dest)
 		usage(send_pack_usage);
 	if (heads && send_all)
 		usage(send_pack_usage);
 	verify_remote_names(nr_heads, heads);

 	pid = git_connect(fd, dest, receivepack);
 	if (pid < 0)
 		return 1;
 	ret = send_pack(fd[0], fd[1], nr_heads, heads);
 	close(fd[0]);
 	close(fd[1]);
 	ret |= finish_connect(pid);
 	return !!ret;
 }
	#include "cache.h"
	#include "commit.h"
	#include "tag.h"
	#include "refs.h"
	#include "pkt-line.h"
	#include "run-command.h"

	static const char send_pack_usage[] =
	"git-send-pack [--all] [--force] [--receive-pack=<git-receive-pack>] [--verbose] [--thin] [<host>:]<directory> [<ref>...]\n"
	" --all and explicit <ref> specification are mutually exclusive.";
	static const char *receivepack = "git-receive-pack";
	static int verbose;
	static int send_all;
	static int force_update;
	static int use_thin_pack;

	/*
	* Make a pack stream and spit it out into file descriptor fd
	*/
	static int pack_objects(int fd, struct ref *refs)
	{
	/*
	* The child becomes pack-objects --revs; we feed
	* the revision parameters to it via its stdin and
	* let its stdout go back to the other end.
	*/
	const char *args[] = {
	"pack-objects",
	"--all-progress",
	"--revs",
	"--stdout",
	NULL,
	NULL,
	};
	struct child_process po;

	if (use_thin_pack)
	args[4] = "--thin";
	memset(&po, 0, sizeof(po));
	po.argv = args;
	po.in = -1;
	po.out = fd;
	po.git_cmd = 1;
	if (start_command(&po))
	die("git-pack-objects failed (%s)", strerror(errno));

	/*
	* We feed the pack-objects we just spawned with revision
	* parameters by writing to the pipe.
	*/
	while (refs) {
	char buf[42];

	if (!is_null_sha1(refs->old_sha1) &&
	has_sha1_file(refs->old_sha1)) {
	memcpy(buf + 1, sha1_to_hex(refs->old_sha1), 40);
	buf[0] = '^';
	buf[41] = '\n';
	if (!write_or_whine(po.in, buf, 42,
	"send-pack: send refs"))
	break;
	}
	if (!is_null_sha1(refs->new_sha1)) {
	memcpy(buf, sha1_to_hex(refs->new_sha1), 40);
	buf[40] = '\n';
	if (!write_or_whine(po.in, buf, 41,
	"send-pack: send refs"))
	break;
	}
	refs = refs->next;
	}

	if (finish_command(&po))
	return error("pack-objects died with strange error");
	return 0;
	}

	static void unmark_and_free(struct commit_list *list, unsigned int mark)
	{
	while (list) {
	struct commit_list *temp = list;
	temp->item->object.flags &= ~mark;
	list = temp->next;
	free(temp);
	}
	}

	static int ref_newer(const unsigned char *new_sha1,
	const unsigned char *old_sha1)
	{
	struct object *o;
	struct commit old, new;
	struct commit_list list, used;
	int found = 0;

	/* Both new and old must be commit-ish and new is descendant of
	* old. Otherwise we require --force.
	*/
	o = deref_tag(parse_object(old_sha1), NULL, 0);
	if (!o \|\| o->type != OBJ_COMMIT)
	return 0;
	old = (struct commit *) o;

	o = deref_tag(parse_object(new_sha1), NULL, 0);
	if (!o \|\| o->type != OBJ_COMMIT)
	return 0;
	new = (struct commit *) o;

	if (parse_commit(new) < 0)
	return 0;

	used = list = NULL;
	commit_list_insert(new, &list);
	while (list) {
	new = pop_most_recent_commit(&list, 1);
	commit_list_insert(new, &used);
	if (new == old) {
	found = 1;
	break;
	}
	}
	unmark_and_free(list, 1);
	unmark_and_free(used, 1);
	return found;
	}

	static struct ref local_refs, *local_tail;
	static struct ref remote_refs, *remote_tail;

	static int one_local_ref(const char refname, const unsigned char sha1, int flag, void *cb_data)
	{
	struct ref *ref;
	int len = strlen(refname) + 1;
	ref = xcalloc(1, sizeof(*ref) + len);
	hashcpy(ref->new_sha1, sha1);
	memcpy(ref->name, refname, len);
	*local_tail = ref;
	local_tail = &ref->next;
	return 0;
	}

	static void get_local_heads(void)
	{
	local_tail = &local_refs;
	for_each_ref(one_local_ref, NULL);
	}

	static int receive_status(int in)
	{
	char line[1000];
	int ret = 0;
	int len = packet_read_line(in, line, sizeof(line));
	if (len < 10 \|\| memcmp(line, "unpack ", 7)) {
	fprintf(stderr, "did not receive status back\n");
	return -1;
	}
	if (memcmp(line, "unpack ok\n", 10)) {
	fputs(line, stderr);
	ret = -1;
	}
	while (1) {
	len = packet_read_line(in, line, sizeof(line));
	if (!len)
	break;
	if (len < 3 \|\|
	(memcmp(line, "ok", 2) && memcmp(line, "ng", 2))) {
	fprintf(stderr, "protocol error: %s\n", line);
	ret = -1;
	break;
	}
	if (!memcmp(line, "ok", 2))
	continue;
	fputs(line, stderr);
	ret = -1;
	}
	return ret;
	}

	static int send_pack(int in, int out, int nr_refspec, char **refspec)
	{
	struct ref *ref;
	int new_refs;
	int ret = 0;
	int ask_for_status_report = 0;
	int allow_deleting_refs = 0;
	int expect_status_report = 0;

	/* No funny business with the matcher */
	remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, REF_NORMAL);
	get_local_heads();

	/* Does the other end support the reporting? */
	if (server_supports("report-status"))
	ask_for_status_report = 1;
	if (server_supports("delete-refs"))
	allow_deleting_refs = 1;

	/* match them up */
	if (!remote_tail)
	remote_tail = &remote_refs;
	if (match_refs(local_refs, remote_refs, &remote_tail,
	nr_refspec, refspec, send_all))
	return -1;

	if (!remote_refs) {
	fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
	return 0;
	}

	/*
	* Finally, tell the other end!
	*/
	new_refs = 0;
	for (ref = remote_refs; ref; ref = ref->next) {
	char old_hex[60], *new_hex;
	int delete_ref;

	if (!ref->peer_ref)
	continue;

	delete_ref = is_null_sha1(ref->peer_ref->new_sha1);
	if (delete_ref && !allow_deleting_refs) {
	error("remote does not support deleting refs");
	ret = -2;
	continue;
	}
	if (!delete_ref &&
	!hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
	if (verbose)
	fprintf(stderr, "'%s': up-to-date\n", ref->name);
	continue;
	}

	/* This part determines what can overwrite what.
	* The rules are:
	*
	* (0) you can always use --force or +A:B notation to
	* selectively force individual ref pairs.
	*
	* (1) if the old thing does not exist, it is OK.
	*
	* (2) if you do not have the old thing, you are not allowed
	* to overwrite it; you would not know what you are losing
	* otherwise.
	*
	* (3) if both new and old are commit-ish, and new is a
	* descendant of old, it is OK.
	*
	* (4) regardless of all of the above, removing :B is
	* always allowed.
	*/

	if (!force_update &&
	!delete_ref &&
	!is_null_sha1(ref->old_sha1) &&
	!ref->force) {
	if (!has_sha1_file(ref->old_sha1) \|\|
	!ref_newer(ref->peer_ref->new_sha1,
	ref->old_sha1)) {
	/* We do not have the remote ref, or
	* we know that the remote ref is not
	* an ancestor of what we are trying to
	* push. Either way this can be losing
	* commits at the remote end and likely
	* we were not up to date to begin with.
	*/
	error("remote '%s' is not a strict "
	"subset of local ref '%s'. "
	"maybe you are not up-to-date and "
	"need to pull first?",
	ref->name,
	ref->peer_ref->name);
	ret = -2;
	continue;
	}
	}
	hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
	if (!delete_ref)
	new_refs++;
	strcpy(old_hex, sha1_to_hex(ref->old_sha1));
	new_hex = sha1_to_hex(ref->new_sha1);

	if (ask_for_status_report) {
	packet_write(out, "%s %s %s%c%s",
	old_hex, new_hex, ref->name, 0,
	"report-status");
	ask_for_status_report = 0;
	expect_status_report = 1;
	}
	else
	packet_write(out, "%s %s %s",
	old_hex, new_hex, ref->name);
	if (delete_ref)
	fprintf(stderr, "deleting '%s'\n", ref->name);
	else {
	fprintf(stderr, "updating '%s'", ref->name);
	if (strcmp(ref->name, ref->peer_ref->name))
	fprintf(stderr, " using '%s'",
	ref->peer_ref->name);
	fprintf(stderr, "\n from %s\n to %s\n",
	old_hex, new_hex);
	}
	}

	packet_flush(out);
	if (new_refs)
	ret = pack_objects(out, remote_refs);
	close(out);

	if (expect_status_report) {
	if (receive_status(in))
	ret = -4;
	}

	if (!new_refs && ret == 0)
	fprintf(stderr, "Everything up-to-date\n");
	return ret;
	}

	static void verify_remote_names(int nr_heads, char **heads)
	{
	int i;

	for (i = 0; i < nr_heads; i++) {
	const char *remote = strchr(heads[i], ':');

	remote = remote ? (remote + 1) : heads[i];
	switch (check_ref_format(remote)) {
	case 0: /* ok */
	case -2: /* ok but a single level -- that is fine for
	* a match pattern.
	*/
	continue;
	}
	die("remote part of refspec is not a valid name in %s",
	heads[i]);
	}
	}

	int main(int argc, char **argv)
	{
	int i, nr_heads = 0;
	char *dest = NULL;
	char **heads = NULL;
	int fd[2], ret;
	pid_t pid;

	setup_git_directory();
	git_config(git_default_config);

	argv++;
	for (i = 1; i < argc; i++, argv++) {
	char arg = argv;

	if (*arg == '-') {
	if (!prefixcmp(arg, "--receive-pack=")) {
	receivepack = arg + 15;
	continue;
	}
	if (!prefixcmp(arg, "--exec=")) {
	receivepack = arg + 7;
	continue;
	}
	if (!strcmp(arg, "--all")) {
	send_all = 1;
	continue;
	}
	if (!strcmp(arg, "--force")) {
	force_update = 1;
	continue;
	}
	if (!strcmp(arg, "--verbose")) {
	verbose = 1;
	continue;
	}
	if (!strcmp(arg, "--thin")) {
	use_thin_pack = 1;
	continue;
	}
	usage(send_pack_usage);
	}
	if (!dest) {
	dest = arg;
	continue;
	}
	heads = argv;
	nr_heads = argc - i;
	break;
	}
	if (!dest)
	usage(send_pack_usage);
	if (heads && send_all)
	usage(send_pack_usage);
	verify_remote_names(nr_heads, heads);

	pid = git_connect(fd, dest, receivepack);
	if (pid < 0)
	return 1;
	ret = send_pack(fd[0], fd[1], nr_heads, heads);
	close(fd[0]);
	close(fd[1]);
	ret \|= finish_connect(pid);
	return !!ret;
	}