bundle.c - git - Git at Google

 #include "cache.h"
 #include "bundle.h"
 #include "object.h"
 #include "commit.h"
 #include "diff.h"
 #include "revision.h"
 #include "list-objects.h"
 #include "run-command.h"
 #include "refs.h"

 static const char bundle_signature[] = "# v2 git bundle\n";

 static void add_to_ref_list(const unsigned char *sha1, const char *name,
 		struct ref_list *list)
 {
 	if (list->nr + 1 >= list->alloc) {
 		list->alloc = alloc_nr(list->nr + 1);
 		list->list = xrealloc(list->list,
 				list->alloc * sizeof(list->list[0]));
 	}
 	memcpy(list->list[list->nr].sha1, sha1, 20);
 	list->list[list->nr].name = xstrdup(name);
 	list->nr++;
 }

 /* returns an fd */
 int read_bundle_header(const char *path, struct bundle_header *header)
 {
 	char buffer[1024];
 	int fd;
 	long fpos;
 	FILE *ffd = fopen(path, "rb");

 	if (!ffd)
 		return error("could not open '%s'", path);
 	if (!fgets(buffer, sizeof(buffer), ffd) ||
 			strcmp(buffer, bundle_signature)) {
 		fclose(ffd);
 		return error("'%s' does not look like a v2 bundle file", path);
 	}
 	while (fgets(buffer, sizeof(buffer), ffd)
 			&& buffer[0] != '\n') {
 		int is_prereq = buffer[0] == '-';
 		int offset = is_prereq ? 1 : 0;
 		int len = strlen(buffer);
 		unsigned char sha1[20];
 		struct ref_list *list = is_prereq ? &header->prerequisites
 			: &header->references;
 		char delim;

 		if (buffer[len - 1] == '\n')
 			buffer[len - 1] = '\0';
 		if (get_sha1_hex(buffer + offset, sha1)) {
 			warning("unrecognized header: %s", buffer);
 			continue;
 		}
 		delim = buffer[40 + offset];
 		if (!isspace(delim) && (delim != '\0' || !is_prereq))
 			die ("invalid header: %s", buffer);
 		add_to_ref_list(sha1, isspace(delim) ?
 				buffer + 41 + offset : "", list);
 	}
 	fpos = ftell(ffd);
 	fclose(ffd);
 	fd = open(path, O_RDONLY);
 	if (fd < 0)
 		return error("could not open '%s'", path);
 	lseek(fd, fpos, SEEK_SET);
 	return fd;
 }

 static int list_refs(struct ref_list *r, int argc, const char **argv)
 {
 	int i;

 	for (i = 0; i < r->nr; i++) {
 		if (argc > 1) {
 			int j;
 			for (j = 1; j < argc; j++)
 				if (!strcmp(r->list[i].name, argv[j]))
 					break;
 			if (j == argc)
 				continue;
 		}
 		printf("%s %s\n", sha1_to_hex(r->list[i].sha1),
 				r->list[i].name);
 	}
 	return 0;
 }

 #define PREREQ_MARK (1u<<16)

 int verify_bundle(struct bundle_header *header, int verbose)
 {
 	/*
 	 * Do fast check, then if any prereqs are missing then go line by line
 	 * to be verbose about the errors
 	 */
 	struct ref_list *p = &header->prerequisites;
 	struct rev_info revs;
 	const char *argv[] = {NULL, "--all"};
 	struct object_array refs;
 	struct commit *commit;
 	int i, ret = 0, req_nr;
 	const char *message = "Repository lacks these prerequisite commits:";

 	init_revisions(&revs, NULL);
 	for (i = 0; i < p->nr; i++) {
 		struct ref_list_entry *e = p->list + i;
 		struct object *o = parse_object(e->sha1);
 		if (o) {
 			o->flags |= PREREQ_MARK;
 			add_pending_object(&revs, o, e->name);
 			continue;
 		}
 		if (++ret == 1)
 			error(message);
 		error("%s %s", sha1_to_hex(e->sha1), e->name);
 	}
 	if (revs.pending.nr != p->nr)
 		return ret;
 	req_nr = revs.pending.nr;
 	setup_revisions(2, argv, &revs, NULL);

 	memset(&refs, 0, sizeof(struct object_array));
 	for (i = 0; i < revs.pending.nr; i++) {
 		struct object_array_entry *e = revs.pending.objects + i;
 		add_object_array(e->item, e->name, &refs);
 	}

 	prepare_revision_walk(&revs);

 	i = req_nr;
 	while (i && (commit = get_revision(&revs)))
 		if (commit->object.flags & PREREQ_MARK)
 			i--;

 	for (i = 0; i < req_nr; i++)
 		if (!(refs.objects[i].item->flags & SHOWN)) {
 			if (++ret == 1)
 				error(message);
 			error("%s %s", sha1_to_hex(refs.objects[i].item->sha1),
 				refs.objects[i].name);
 		}

 	for (i = 0; i < refs.nr; i++)
 		clear_commit_marks((struct commit *)refs.objects[i].item, -1);

 	if (verbose) {
 		struct ref_list *r;

 		r = &header->references;
 		printf("The bundle contains %d ref%s\n",
 		       r->nr, (1 < r->nr) ? "s" : "");
 		list_refs(r, 0, NULL);
 		r = &header->prerequisites;
 		printf("The bundle requires these %d ref%s\n",
 		       r->nr, (1 < r->nr) ? "s" : "");
 		list_refs(r, 0, NULL);
 	}
 	return ret;
 }

 int list_bundle_refs(struct bundle_header *header, int argc, const char **argv)
 {
 	return list_refs(&header->references, argc, argv);
 }

 int create_bundle(struct bundle_header *header, const char *path,
 		int argc, const char **argv)
 {
 	static struct lock_file lock;
 	int bundle_fd = -1;
 	int bundle_to_stdout;
 	const char **argv_boundary = xmalloc((argc + 4) * sizeof(const char *));
 	const char **argv_pack = xmalloc(5 * sizeof(const char *));
 	int i, ref_count = 0;
 	char buffer[1024];
 	struct rev_info revs;
 	struct child_process rls;
 	FILE *rls_fout;

 	bundle_to_stdout = !strcmp(path, "-");
 	if (bundle_to_stdout)
 		bundle_fd = 1;
 	else
 		bundle_fd = hold_lock_file_for_update(&lock, path, 1);

 	/* write signature */
 	write_or_die(bundle_fd, bundle_signature, strlen(bundle_signature));

 	/* init revs to list objects for pack-objects later */
 	save_commit_buffer = 0;
 	init_revisions(&revs, NULL);

 	/* write prerequisites */
 	memcpy(argv_boundary + 3, argv + 1, argc * sizeof(const char *));
 	argv_boundary[0] = "rev-list";
 	argv_boundary[1] = "--boundary";
 	argv_boundary[2] = "--pretty=oneline";
 	argv_boundary[argc + 2] = NULL;
 	memset(&rls, 0, sizeof(rls));
 	rls.argv = argv_boundary;
 	rls.out = -1;
 	rls.git_cmd = 1;
 	if (start_command(&rls))
 		return -1;
 	rls_fout = fdopen(rls.out, "r");
 	while (fgets(buffer, sizeof(buffer), rls_fout)) {
 		unsigned char sha1[20];
 		if (buffer[0] == '-') {
 			write_or_die(bundle_fd, buffer, strlen(buffer));
 			if (!get_sha1_hex(buffer + 1, sha1)) {
 				struct object *object = parse_object(sha1);
 				object->flags |= UNINTERESTING;
 				add_pending_object(&revs, object, buffer);
 			}
 		} else if (!get_sha1_hex(buffer, sha1)) {
 			struct object *object = parse_object(sha1);
 			object->flags |= SHOWN;
 		}
 	}
 	fclose(rls_fout);
 	if (finish_command(&rls))
 		return error("rev-list died");

 	/* write references */
 	argc = setup_revisions(argc, argv, &revs, NULL);
 	if (argc > 1)
 		return error("unrecognized argument: %s'", argv[1]);

 	for (i = 0; i < revs.pending.nr; i++) {
 		struct object_array_entry *e = revs.pending.objects + i;
 		unsigned char sha1[20];
 		char *ref;
 		const char *display_ref;
 		int flag;

 		if (e->item->flags & UNINTERESTING)
 			continue;
 		if (dwim_ref(e->name, strlen(e->name), sha1, &ref) != 1)
 			continue;
 		if (!resolve_ref(e->name, sha1, 1, &flag))
 			flag = 0;
 		display_ref = (flag & REF_ISSYMREF) ? e->name : ref;

 		/*
 		 * Make sure the refs we wrote out is correct; --max-count and
 		 * other limiting options could have prevented all the tips
 		 * from getting output.
 		 *
 		 * Non commit objects such as tags and blobs do not have
 		 * this issue as they are not affected by those extra
 		 * constraints.
 		 */
 		if (!(e->item->flags & SHOWN) && e->item->type == OBJ_COMMIT) {
 			warning("ref '%s' is excluded by the rev-list options",
 				e->name);
 			free(ref);
 			continue;
 		}
 		/*
 		 * If you run "git bundle create bndl v1.0..v2.0", the
 		 * name of the positive ref is "v2.0" but that is the
 		 * commit that is referenced by the tag, and not the tag
 		 * itself.
 		 */
 		if (hashcmp(sha1, e->item->sha1)) {
 			/*
 			 * Is this the positive end of a range expressed
 			 * in terms of a tag (e.g. v2.0 from the range
 			 * "v1.0..v2.0")?
 			 */
 			struct commit *one = lookup_commit_reference(sha1);
 			struct object *obj;

 			if (e->item == &(one->object)) {
 				/*
 				 * Need to include e->name as an
 				 * independent ref to the pack-objects
 				 * input, so that the tag is included
 				 * in the output; otherwise we would
 				 * end up triggering "empty bundle"
 				 * error.
 				 */
 				obj = parse_object(sha1);
 				obj->flags |= SHOWN;
 				add_pending_object(&revs, obj, e->name);
 			}
 			free(ref);
 			continue;
 		}

 		ref_count++;
 		write_or_die(bundle_fd, sha1_to_hex(e->item->sha1), 40);
 		write_or_die(bundle_fd, " ", 1);
 		write_or_die(bundle_fd, display_ref, strlen(display_ref));
 		write_or_die(bundle_fd, "\n", 1);
 		free(ref);
 	}
 	if (!ref_count)
 		die ("Refusing to create empty bundle.");

 	/* end header */
 	write_or_die(bundle_fd, "\n", 1);

 	/* write pack */
 	argv_pack[0] = "pack-objects";
 	argv_pack[1] = "--all-progress";
 	argv_pack[2] = "--stdout";
 	argv_pack[3] = "--thin";
 	argv_pack[4] = NULL;
 	memset(&rls, 0, sizeof(rls));
 	rls.argv = argv_pack;
 	rls.in = -1;
 	rls.out = bundle_fd;
 	rls.git_cmd = 1;
 	if (start_command(&rls))
 		return error("Could not spawn pack-objects");
 	for (i = 0; i < revs.pending.nr; i++) {
 		struct object *object = revs.pending.objects[i].item;
 		if (object->flags & UNINTERESTING)
 			write(rls.in, "^", 1);
 		write(rls.in, sha1_to_hex(object->sha1), 40);
 		write(rls.in, "\n", 1);
 	}
 	if (finish_command(&rls))
 		return error ("pack-objects died");
 	close(bundle_fd);
 	if (!bundle_to_stdout)
 		commit_lock_file(&lock);
 	return 0;
 }

 int unbundle(struct bundle_header *header, int bundle_fd)
 {
 	const char *argv_index_pack[] = {"index-pack",
 		"--fix-thin", "--stdin", NULL};
 	struct child_process ip;

 	if (verify_bundle(header, 0))
 		return -1;
 	memset(&ip, 0, sizeof(ip));
 	ip.argv = argv_index_pack;
 	ip.in = bundle_fd;
 	ip.no_stdout = 1;
 	ip.git_cmd = 1;
 	if (run_command(&ip))
 		return error("index-pack died");
 	return 0;
 }
	#include "cache.h"
	#include "bundle.h"
	#include "object.h"
	#include "commit.h"
	#include "diff.h"
	#include "revision.h"
	#include "list-objects.h"
	#include "run-command.h"
	#include "refs.h"

	static const char bundle_signature[] = "# v2 git bundle\n";

	static void add_to_ref_list(const unsigned char sha1, const char name,
	struct ref_list *list)
	{
	if (list->nr + 1 >= list->alloc) {
	list->alloc = alloc_nr(list->nr + 1);
	list->list = xrealloc(list->list,
	list->alloc * sizeof(list->list[0]));
	}
	memcpy(list->list[list->nr].sha1, sha1, 20);
	list->list[list->nr].name = xstrdup(name);
	list->nr++;
	}

	/* returns an fd */
	int read_bundle_header(const char path, struct bundle_header header)
	{
	char buffer[1024];
	int fd;
	long fpos;
	FILE *ffd = fopen(path, "rb");

	if (!ffd)
	return error("could not open '%s'", path);
	if (!fgets(buffer, sizeof(buffer), ffd) \|\|
	strcmp(buffer, bundle_signature)) {
	fclose(ffd);
	return error("'%s' does not look like a v2 bundle file", path);
	}
	while (fgets(buffer, sizeof(buffer), ffd)
	&& buffer[0] != '\n') {
	int is_prereq = buffer[0] == '-';
	int offset = is_prereq ? 1 : 0;
	int len = strlen(buffer);
	unsigned char sha1[20];
	struct ref_list *list = is_prereq ? &header->prerequisites
	: &header->references;
	char delim;

	if (buffer[len - 1] == '\n')
	buffer[len - 1] = '\0';
	if (get_sha1_hex(buffer + offset, sha1)) {
	warning("unrecognized header: %s", buffer);
	continue;
	}
	delim = buffer[40 + offset];
	if (!isspace(delim) && (delim != '\0' \|\| !is_prereq))
	die ("invalid header: %s", buffer);
	add_to_ref_list(sha1, isspace(delim) ?
	buffer + 41 + offset : "", list);
	}
	fpos = ftell(ffd);
	fclose(ffd);
	fd = open(path, O_RDONLY);
	if (fd < 0)
	return error("could not open '%s'", path);
	lseek(fd, fpos, SEEK_SET);
	return fd;
	}

	static int list_refs(struct ref_list r, int argc, const char *argv)
	{
	int i;

	for (i = 0; i < r->nr; i++) {
	if (argc > 1) {
	int j;
	for (j = 1; j < argc; j++)
	if (!strcmp(r->list[i].name, argv[j]))
	break;
	if (j == argc)
	continue;
	}
	printf("%s %s\n", sha1_to_hex(r->list[i].sha1),
	r->list[i].name);
	}
	return 0;
	}

	#define PREREQ_MARK (1u<<16)

	int verify_bundle(struct bundle_header *header, int verbose)
	{
	/*
	* Do fast check, then if any prereqs are missing then go line by line
	* to be verbose about the errors
	*/
	struct ref_list *p = &header->prerequisites;
	struct rev_info revs;
	const char *argv[] = {NULL, "--all"};
	struct object_array refs;
	struct commit *commit;
	int i, ret = 0, req_nr;
	const char *message = "Repository lacks these prerequisite commits:";

	init_revisions(&revs, NULL);
	for (i = 0; i < p->nr; i++) {
	struct ref_list_entry *e = p->list + i;
	struct object *o = parse_object(e->sha1);
	if (o) {
	o->flags \|= PREREQ_MARK;
	add_pending_object(&revs, o, e->name);
	continue;
	}
	if (++ret == 1)
	error(message);
	error("%s %s", sha1_to_hex(e->sha1), e->name);
	}
	if (revs.pending.nr != p->nr)
	return ret;
	req_nr = revs.pending.nr;
	setup_revisions(2, argv, &revs, NULL);

	memset(&refs, 0, sizeof(struct object_array));
	for (i = 0; i < revs.pending.nr; i++) {
	struct object_array_entry *e = revs.pending.objects + i;
	add_object_array(e->item, e->name, &refs);
	}

	prepare_revision_walk(&revs);

	i = req_nr;
	while (i && (commit = get_revision(&revs)))
	if (commit->object.flags & PREREQ_MARK)
	i--;

	for (i = 0; i < req_nr; i++)
	if (!(refs.objects[i].item->flags & SHOWN)) {
	if (++ret == 1)
	error(message);
	error("%s %s", sha1_to_hex(refs.objects[i].item->sha1),
	refs.objects[i].name);
	}

	for (i = 0; i < refs.nr; i++)
	clear_commit_marks((struct commit *)refs.objects[i].item, -1);

	if (verbose) {
	struct ref_list *r;

	r = &header->references;
	printf("The bundle contains %d ref%s\n",
	r->nr, (1 < r->nr) ? "s" : "");
	list_refs(r, 0, NULL);
	r = &header->prerequisites;
	printf("The bundle requires these %d ref%s\n",
	r->nr, (1 < r->nr) ? "s" : "");
	list_refs(r, 0, NULL);
	}
	return ret;
	}

	int list_bundle_refs(struct bundle_header header, int argc, const char *argv)
	{
	return list_refs(&header->references, argc, argv);
	}

	int create_bundle(struct bundle_header header, const char path,
	int argc, const char **argv)
	{
	static struct lock_file lock;
	int bundle_fd = -1;
	int bundle_to_stdout;
	const char *argv_boundary = xmalloc((argc + 4) sizeof(const char *));
	const char *argv_pack = xmalloc(5 sizeof(const char *));
	int i, ref_count = 0;
	char buffer[1024];
	struct rev_info revs;
	struct child_process rls;
	FILE *rls_fout;

	bundle_to_stdout = !strcmp(path, "-");
	if (bundle_to_stdout)
	bundle_fd = 1;
	else
	bundle_fd = hold_lock_file_for_update(&lock, path, 1);

	/* write signature */
	write_or_die(bundle_fd, bundle_signature, strlen(bundle_signature));

	/* init revs to list objects for pack-objects later */
	save_commit_buffer = 0;
	init_revisions(&revs, NULL);

	/* write prerequisites */
	memcpy(argv_boundary + 3, argv + 1, argc * sizeof(const char *));
	argv_boundary[0] = "rev-list";
	argv_boundary[1] = "--boundary";
	argv_boundary[2] = "--pretty=oneline";
	argv_boundary[argc + 2] = NULL;
	memset(&rls, 0, sizeof(rls));
	rls.argv = argv_boundary;
	rls.out = -1;
	rls.git_cmd = 1;
	if (start_command(&rls))
	return -1;
	rls_fout = fdopen(rls.out, "r");
	while (fgets(buffer, sizeof(buffer), rls_fout)) {
	unsigned char sha1[20];
	if (buffer[0] == '-') {
	write_or_die(bundle_fd, buffer, strlen(buffer));
	if (!get_sha1_hex(buffer + 1, sha1)) {
	struct object *object = parse_object(sha1);
	object->flags \|= UNINTERESTING;
	add_pending_object(&revs, object, buffer);
	}
	} else if (!get_sha1_hex(buffer, sha1)) {
	struct object *object = parse_object(sha1);
	object->flags \|= SHOWN;
	}
	}
	fclose(rls_fout);
	if (finish_command(&rls))
	return error("rev-list died");

	/* write references */
	argc = setup_revisions(argc, argv, &revs, NULL);
	if (argc > 1)
	return error("unrecognized argument: %s'", argv[1]);

	for (i = 0; i < revs.pending.nr; i++) {
	struct object_array_entry *e = revs.pending.objects + i;
	unsigned char sha1[20];
	char *ref;
	const char *display_ref;
	int flag;

	if (e->item->flags & UNINTERESTING)
	continue;
	if (dwim_ref(e->name, strlen(e->name), sha1, &ref) != 1)
	continue;
	if (!resolve_ref(e->name, sha1, 1, &flag))
	flag = 0;
	display_ref = (flag & REF_ISSYMREF) ? e->name : ref;

	/*
	* Make sure the refs we wrote out is correct; --max-count and
	* other limiting options could have prevented all the tips
	* from getting output.
	*
	* Non commit objects such as tags and blobs do not have
	* this issue as they are not affected by those extra
	* constraints.
	*/
	if (!(e->item->flags & SHOWN) && e->item->type == OBJ_COMMIT) {
	warning("ref '%s' is excluded by the rev-list options",
	e->name);
	free(ref);
	continue;
	}
	/*
	* If you run "git bundle create bndl v1.0..v2.0", the
	* name of the positive ref is "v2.0" but that is the
	* commit that is referenced by the tag, and not the tag
	* itself.
	*/
	if (hashcmp(sha1, e->item->sha1)) {
	/*
	* Is this the positive end of a range expressed
	* in terms of a tag (e.g. v2.0 from the range
	* "v1.0..v2.0")?
	*/
	struct commit *one = lookup_commit_reference(sha1);
	struct object *obj;

	if (e->item == &(one->object)) {
	/*
	* Need to include e->name as an
	* independent ref to the pack-objects
	* input, so that the tag is included
	* in the output; otherwise we would
	* end up triggering "empty bundle"
	* error.
	*/
	obj = parse_object(sha1);
	obj->flags \|= SHOWN;
	add_pending_object(&revs, obj, e->name);
	}
	free(ref);
	continue;
	}

	ref_count++;
	write_or_die(bundle_fd, sha1_to_hex(e->item->sha1), 40);
	write_or_die(bundle_fd, " ", 1);
	write_or_die(bundle_fd, display_ref, strlen(display_ref));
	write_or_die(bundle_fd, "\n", 1);
	free(ref);
	}
	if (!ref_count)
	die ("Refusing to create empty bundle.");

	/* end header */
	write_or_die(bundle_fd, "\n", 1);

	/* write pack */
	argv_pack[0] = "pack-objects";
	argv_pack[1] = "--all-progress";
	argv_pack[2] = "--stdout";
	argv_pack[3] = "--thin";
	argv_pack[4] = NULL;
	memset(&rls, 0, sizeof(rls));
	rls.argv = argv_pack;
	rls.in = -1;
	rls.out = bundle_fd;
	rls.git_cmd = 1;
	if (start_command(&rls))
	return error("Could not spawn pack-objects");
	for (i = 0; i < revs.pending.nr; i++) {
	struct object *object = revs.pending.objects[i].item;
	if (object->flags & UNINTERESTING)
	write(rls.in, "^", 1);
	write(rls.in, sha1_to_hex(object->sha1), 40);
	write(rls.in, "\n", 1);
	}
	if (finish_command(&rls))
	return error ("pack-objects died");
	close(bundle_fd);
	if (!bundle_to_stdout)
	commit_lock_file(&lock);
	return 0;
	}

	int unbundle(struct bundle_header *header, int bundle_fd)
	{
	const char *argv_index_pack[] = {"index-pack",
	"--fix-thin", "--stdin", NULL};
	struct child_process ip;

	if (verify_bundle(header, 0))
	return -1;
	memset(&ip, 0, sizeof(ip));
	ip.argv = argv_index_pack;
	ip.in = bundle_fd;
	ip.no_stdout = 1;
	ip.git_cmd = 1;
	if (run_command(&ip))
	return error("index-pack died");
	return 0;
	}