X-Git-Url: https://git.tokkee.org/?a=blobdiff_plain;f=upload-pack.c;h=c568ef066c9e7e0021468cfe7cb904f40ac477f1;hb=60c0f8462fefed22fc8fb9c4e529665ed8204536;hp=47560c9527b9c17db34f10e78d7c1f0d99b746e1;hpb=9201c707426b3dc0c894775416f576c25c008d46;p=git.git

diff --git a/upload-pack.c b/upload-pack.c
index 47560c952..c568ef066 100644
--- a/upload-pack.c
+++ b/upload-pack.c
@@ -1,23 +1,39 @@
 #include "cache.h"
 #include "refs.h"
 #include "pkt-line.h"
+#include "sideband.h"
 #include "tag.h"
 #include "object.h"
 #include "commit.h"
 #include "exec_cmd.h"
+#include "diff.h"
+#include "revision.h"
+#include "list-objects.h"
 
 static const char upload_pack_usage[] = "git-upload-pack [--strict] [--timeout=nn] <dir>";
 
-#define THEY_HAVE (1U << 0)
-#define OUR_REF (1U << 1)
-#define WANTED (1U << 2)
-#define MAX_HAS 256
-#define MAX_NEEDS 256
-static int nr_has = 0, nr_needs = 0, multi_ack = 0, nr_our_refs = 0;
-static int use_thin_pack = 0;
-static unsigned char has_sha1[MAX_HAS][20];
-static unsigned char needs_sha1[MAX_NEEDS][20];
-static unsigned int timeout = 0;
+/* bits #0..7 in revision.h, #8..10 in commit.c */
+#define THEY_HAVE	(1u << 11)
+#define OUR_REF		(1u << 12)
+#define WANTED		(1u << 13)
+#define COMMON_KNOWN	(1u << 14)
+#define REACHABLE	(1u << 15)
+
+#define SHALLOW		(1u << 16)
+#define NOT_SHALLOW	(1u << 17)
+#define CLIENT_SHALLOW	(1u << 18)
+
+static unsigned long oldest_have;
+
+static int multi_ack, nr_our_refs;
+static int use_thin_pack, use_ofs_delta;
+static struct object_array have_obj;
+static struct object_array want_obj;
+static unsigned int timeout;
+/* 0 for no sideband,
+ * otherwise maximum packet size (up to 65520 bytes).
+ */
+static int use_sideband;
 
 static void reset_timeout(void)
 {
@@ -31,91 +47,389 @@ static int strip(char *line, int len)
 	return len;
 }
 
+static ssize_t send_client_data(int fd, const char *data, ssize_t sz)
+{
+	if (use_sideband)
+		return send_sideband(1, fd, data, sz, use_sideband);
+	if (fd == 3)
+		/* emergency quit */
+		fd = 2;
+	if (fd == 2) {
+		xwrite(fd, data, sz);
+		return sz;
+	}
+	return safe_write(fd, data, sz);
+}
+
+FILE *pack_pipe = NULL;
+static void show_commit(struct commit *commit)
+{
+	if (commit->object.flags & BOUNDARY)
+		fputc('-', pack_pipe);
+	if (fputs(sha1_to_hex(commit->object.sha1), pack_pipe) < 0)
+		die("broken output pipe");
+	fputc('\n', pack_pipe);
+	fflush(pack_pipe);
+	free(commit->buffer);
+	commit->buffer = NULL;
+}
+
+static void show_object(struct object_array_entry *p)
+{
+	/* An object with name "foo\n0000000..." can be used to
+	 * confuse downstream git-pack-objects very badly.
+	 */
+	const char *ep = strchr(p->name, '\n');
+	if (ep) {
+		fprintf(pack_pipe, "%s %.*s\n", sha1_to_hex(p->item->sha1),
+		       (int) (ep - p->name),
+		       p->name);
+	}
+	else
+		fprintf(pack_pipe, "%s %s\n",
+				sha1_to_hex(p->item->sha1), p->name);
+}
+
+static void show_edge(struct commit *commit)
+{
+	fprintf(pack_pipe, "-%s\n", sha1_to_hex(commit->object.sha1));
+}
+
 static void create_pack_file(void)
 {
-	int fd[2];
-	pid_t pid;
-	int create_full_pack = (nr_our_refs == nr_needs && !nr_has);
+	/* Pipes between rev-list to pack-objects, pack-objects to us
+	 * and pack-objects error stream for progress bar.
+	 */
+	int lp_pipe[2], pu_pipe[2], pe_pipe[2];
+	pid_t pid_rev_list, pid_pack_objects;
+	int create_full_pack = (nr_our_refs == want_obj.nr && !have_obj.nr);
+	char data[8193], progress[128];
+	char abort_msg[] = "aborting due to possible repository "
+		"corruption on the remote side.";
+	int buffered = -1;
 
-	if (pipe(fd) < 0)
+	if (pipe(lp_pipe) < 0)
 		die("git-upload-pack: unable to create pipe");
-	pid = fork();
-	if (pid < 0)
+	pid_rev_list = fork();
+	if (pid_rev_list < 0)
 		die("git-upload-pack: unable to fork git-rev-list");
 
-	if (!pid) {
+	if (!pid_rev_list) {
 		int i;
-		int args;
-		const char **argv;
-		char *buf;
-		char **p;
+		struct rev_info revs;
 
-		if (create_full_pack) {
-			args = 10;
+		pack_pipe = fdopen(lp_pipe[1], "w");
+
+		if (create_full_pack)
 			use_thin_pack = 0; /* no point doing it */
+		init_revisions(&revs, NULL);
+		revs.tag_objects = 1;
+		revs.tree_objects = 1;
+		revs.blob_objects = 1;
+		if (use_thin_pack)
+			revs.edge_hint = 1;
+
+		if (create_full_pack) {
+			const char *args[] = {"rev-list", "--all", NULL};
+			setup_revisions(2, args, &revs, NULL);
+		} else {
+			for (i = 0; i < want_obj.nr; i++) {
+				struct object *o = want_obj.objects[i].item;
+				/* why??? */
+				o->flags &= ~UNINTERESTING;
+				add_pending_object(&revs, o, NULL);
+			}
+			for (i = 0; i < have_obj.nr; i++) {
+				struct object *o = have_obj.objects[i].item;
+				o->flags |= UNINTERESTING;
+				add_pending_object(&revs, o, NULL);
+			}
+			setup_revisions(0, NULL, &revs, NULL);
 		}
-		else
-			args = nr_has + nr_needs + 5;
-		p = xmalloc(args * sizeof(char *));
-		argv = (const char **) p;
-		buf = xmalloc(args * 45);
-
-		dup2(fd[1], 1);
-		close(0);
-		close(fd[0]);
-		close(fd[1]);
-		*p++ = "rev-list";
-		*p++ = use_thin_pack ? "--objects-edge" : "--objects";
-		if (create_full_pack || MAX_NEEDS <= nr_needs)
-			*p++ = "--all";
-		else {
-			for (i = 0; i < nr_needs; i++) {
-				*p++ = buf;
-				memcpy(buf, sha1_to_hex(needs_sha1[i]), 41);
-				buf += 41;
+		prepare_revision_walk(&revs);
+		mark_edges_uninteresting(revs.commits, &revs, show_edge);
+		traverse_commit_list(&revs, show_commit, show_object);
+		exit(0);
+	}
+
+	if (pipe(pu_pipe) < 0)
+		die("git-upload-pack: unable to create pipe");
+	if (pipe(pe_pipe) < 0)
+		die("git-upload-pack: unable to create pipe");
+	pid_pack_objects = fork();
+	if (pid_pack_objects < 0) {
+		/* daemon sets things up to ignore TERM */
+		kill(pid_rev_list, SIGKILL);
+		die("git-upload-pack: unable to fork git-pack-objects");
+	}
+	if (!pid_pack_objects) {
+		dup2(lp_pipe[0], 0);
+		dup2(pu_pipe[1], 1);
+		dup2(pe_pipe[1], 2);
+
+		close(lp_pipe[0]);
+		close(lp_pipe[1]);
+		close(pu_pipe[0]);
+		close(pu_pipe[1]);
+		close(pe_pipe[0]);
+		close(pe_pipe[1]);
+		execl_git_cmd("pack-objects", "--stdout", "--progress",
+			      use_ofs_delta ? "--delta-base-offset" : NULL,
+			      NULL);
+		kill(pid_rev_list, SIGKILL);
+		die("git-upload-pack: unable to exec git-pack-objects");
+	}
+
+	close(lp_pipe[0]);
+	close(lp_pipe[1]);
+
+	/* We read from pe_pipe[0] to capture stderr output for
+	 * progress bar, and pu_pipe[0] to capture the pack data.
+	 */
+	close(pe_pipe[1]);
+	close(pu_pipe[1]);
+
+	while (1) {
+		const char *who;
+		struct pollfd pfd[2];
+		pid_t pid;
+		int status;
+		ssize_t sz;
+		int pe, pu, pollsize;
+
+		reset_timeout();
+
+		pollsize = 0;
+		pe = pu = -1;
+
+		if (0 <= pu_pipe[0]) {
+			pfd[pollsize].fd = pu_pipe[0];
+			pfd[pollsize].events = POLLIN;
+			pu = pollsize;
+			pollsize++;
+		}
+		if (0 <= pe_pipe[0]) {
+			pfd[pollsize].fd = pe_pipe[0];
+			pfd[pollsize].events = POLLIN;
+			pe = pollsize;
+			pollsize++;
+		}
+
+		if (pollsize) {
+			if (poll(pfd, pollsize, -1) < 0) {
+				if (errno != EINTR) {
+					error("poll failed, resuming: %s",
+					      strerror(errno));
+					sleep(1);
+				}
+				continue;
+			}
+			if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
+				/* Data ready; we keep the last byte
+				 * to ourselves in case we detect
+				 * broken rev-list, so that we can
+				 * leave the stream corrupted.  This
+				 * is unfortunate -- unpack-objects
+				 * would happily accept a valid pack
+				 * data with trailing garbage, so
+				 * appending garbage after we pass all
+				 * the pack data is not good enough to
+				 * signal breakage to downstream.
+				 */
+				char *cp = data;
+				ssize_t outsz = 0;
+				if (0 <= buffered) {
+					*cp++ = buffered;
+					outsz++;
+				}
+				sz = read(pu_pipe[0], cp,
+					  sizeof(data) - outsz);
+				if (0 < sz)
+						;
+				else if (sz == 0) {
+					close(pu_pipe[0]);
+					pu_pipe[0] = -1;
+				}
+				else
+					goto fail;
+				sz += outsz;
+				if (1 < sz) {
+					buffered = data[sz-1] & 0xFF;
+					sz--;
+				}
+				else
+					buffered = -1;
+				sz = send_client_data(1, data, sz);
+				if (sz < 0)
+					goto fail;
+			}
+			if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
+				/* Status ready; we ship that in the side-band
+				 * or dump to the standard error.
+				 */
+				sz = read(pe_pipe[0], progress,
+					  sizeof(progress));
+				if (0 < sz)
+					send_client_data(2, progress, sz);
+				else if (sz == 0) {
+					close(pe_pipe[0]);
+					pe_pipe[0] = -1;
+				}
+				else
+					goto fail;
 			}
 		}
-		if (!create_full_pack)
-			for (i = 0; i < nr_has; i++) {
-				*p++ = buf;
-				*buf++ = '^';
-				memcpy(buf, sha1_to_hex(has_sha1[i]), 41);
-				buf += 41;
+
+		/* See if the children are still there */
+		if (pid_rev_list || pid_pack_objects) {
+			pid = waitpid(-1, &status, WNOHANG);
+			if (!pid)
+				continue;
+			who = ((pid == pid_rev_list) ? "git-rev-list" :
+			       (pid == pid_pack_objects) ? "git-pack-objects" :
+			       NULL);
+			if (!who) {
+				if (pid < 0) {
+					error("git-upload-pack: %s",
+					      strerror(errno));
+					goto fail;
+				}
+				error("git-upload-pack: we weren't "
+				      "waiting for %d", pid);
+				continue;
+			}
+			if (!WIFEXITED(status) || WEXITSTATUS(status) > 0) {
+				error("git-upload-pack: %s died with error.",
+				      who);
+				goto fail;
 			}
-		*p++ = NULL;
-		execv_git_cmd(argv);
-		die("git-upload-pack: unable to exec git-rev-list");
+			if (pid == pid_rev_list)
+				pid_rev_list = 0;
+			if (pid == pid_pack_objects)
+				pid_pack_objects = 0;
+			if (pid_rev_list || pid_pack_objects)
+				continue;
+		}
+
+		/* both died happily */
+		if (pollsize)
+			continue;
+
+		/* flush the data */
+		if (0 <= buffered) {
+			data[0] = buffered;
+			sz = send_client_data(1, data, 1);
+			if (sz < 0)
+				goto fail;
+			fprintf(stderr, "flushed.\n");
+		}
+		if (use_sideband)
+			packet_flush(1);
+		return;
 	}
-	dup2(fd[0], 0);
-	close(fd[0]);
-	close(fd[1]);
-	execl_git_cmd("pack-objects", "--stdout", NULL);
-	die("git-upload-pack: unable to exec git-pack-objects");
+ fail:
+	if (pid_pack_objects)
+		kill(pid_pack_objects, SIGKILL);
+	if (pid_rev_list)
+		kill(pid_rev_list, SIGKILL);
+	send_client_data(3, abort_msg, sizeof(abort_msg));
+	die("git-upload-pack: %s", abort_msg);
 }
 
 static int got_sha1(char *hex, unsigned char *sha1)
 {
+	struct object *o;
+	int we_knew_they_have = 0;
+
 	if (get_sha1_hex(hex, sha1))
 		die("git-upload-pack: expected SHA1 object, got '%s'", hex);
 	if (!has_sha1_file(sha1))
-		return 0;
-	if (nr_has < MAX_HAS) {
-		struct object *o = lookup_object(sha1);
-		if (!(o && o->parsed))
-			o = parse_object(sha1);
-		if (!o)
-			die("oops (%s)", sha1_to_hex(sha1));
-		if (o->type == commit_type) {
-			struct commit_list *parents;
-			if (o->flags & THEY_HAVE)
-				return 0;
+		return -1;
+
+	o = lookup_object(sha1);
+	if (!(o && o->parsed))
+		o = parse_object(sha1);
+	if (!o)
+		die("oops (%s)", sha1_to_hex(sha1));
+	if (o->type == OBJ_COMMIT) {
+		struct commit_list *parents;
+		struct commit *commit = (struct commit *)o;
+		if (o->flags & THEY_HAVE)
+			we_knew_they_have = 1;
+		else
 			o->flags |= THEY_HAVE;
-			for (parents = ((struct commit*)o)->parents;
-			     parents;
-			     parents = parents->next)
-				parents->item->object.flags |= THEY_HAVE;
+		if (!oldest_have || (commit->date < oldest_have))
+			oldest_have = commit->date;
+		for (parents = commit->parents;
+		     parents;
+		     parents = parents->next)
+			parents->item->object.flags |= THEY_HAVE;
+	}
+	if (!we_knew_they_have) {
+		add_object_array(o, NULL, &have_obj);
+		return 1;
+	}
+	return 0;
+}
+
+static int reachable(struct commit *want)
+{
+	struct commit_list *work = NULL;
+
+	insert_by_date(want, &work);
+	while (work) {
+		struct commit_list *list = work->next;
+		struct commit *commit = work->item;
+		free(work);
+		work = list;
+
+		if (commit->object.flags & THEY_HAVE) {
+			want->object.flags |= COMMON_KNOWN;
+			break;
+		}
+		if (!commit->object.parsed)
+			parse_object(commit->object.sha1);
+		if (commit->object.flags & REACHABLE)
+			continue;
+		commit->object.flags |= REACHABLE;
+		if (commit->date < oldest_have)
+			continue;
+		for (list = commit->parents; list; list = list->next) {
+			struct commit *parent = list->item;
+			if (!(parent->object.flags & REACHABLE))
+				insert_by_date(parent, &work);
+		}
+	}
+	want->object.flags |= REACHABLE;
+	clear_commit_marks(want, REACHABLE);
+	free_commit_list(work);
+	return (want->object.flags & COMMON_KNOWN);
+}
+
+static int ok_to_give_up(void)
+{
+	int i;
+
+	if (!have_obj.nr)
+		return 0;
+
+	for (i = 0; i < want_obj.nr; i++) {
+		struct object *want = want_obj.objects[i].item;
+
+		if (want->flags & COMMON_KNOWN)
+			continue;
+		want = deref_tag(want, "a want line", 0);
+		if (!want || want->type != OBJ_COMMIT) {
+			/* no way to tell if this is reachable by
+			 * looking at the ancestry chain alone, so
+			 * leave a note to ourselves not to worry about
+			 * this object anymore.
+			 */
+			want_obj.objects[i].item->flags |= COMMON_KNOWN;
+			continue;
 		}
-		memcpy(has_sha1[nr_has++], sha1, 20);
+		if (!reachable((struct commit *)want))
+			return 0;
 	}
 	return 1;
 }
@@ -123,7 +437,8 @@ static int got_sha1(char *hex, unsigned char *sha1)
 static int get_common_commits(void)
 {
 	static char line[1000];
-	unsigned char sha1[20], last_sha1[20];
+	unsigned char sha1[20];
+	char hex[41], last_hex[41];
 	int len;
 
 	track_object_refs = 0;
@@ -134,29 +449,35 @@ static int get_common_commits(void)
 		reset_timeout();
 
 		if (!len) {
-			if (nr_has == 0 || multi_ack)
+			if (have_obj.nr == 0 || multi_ack)
 				packet_write(1, "NAK\n");
 			continue;
 		}
 		len = strip(line, len);
 		if (!strncmp(line, "have ", 5)) {
-			if (got_sha1(line+5, sha1) &&
-					(multi_ack || nr_has == 1)) {
-				if (nr_has >= MAX_HAS)
-					multi_ack = 0;
-				packet_write(1, "ACK %s%s\n",
-					sha1_to_hex(sha1),
-					multi_ack ?  " continue" : "");
-				if (multi_ack)
-					memcpy(last_sha1, sha1, 20);
+			switch (got_sha1(line+5, sha1)) {
+			case -1: /* they have what we do not */
+				if (multi_ack && ok_to_give_up())
+					packet_write(1, "ACK %s continue\n",
+						     sha1_to_hex(sha1));
+				break;
+			default:
+				memcpy(hex, sha1_to_hex(sha1), 41);
+				if (multi_ack) {
+					const char *msg = "ACK %s continue\n";
+					packet_write(1, msg, hex);
+					memcpy(last_hex, hex, 41);
+				}
+				else if (have_obj.nr == 1)
+					packet_write(1, "ACK %s\n", hex);
+				break;
 			}
 			continue;
 		}
 		if (!strcmp(line, "done")) {
-			if (nr_has > 0) {
+			if (have_obj.nr > 0) {
 				if (multi_ack)
-					packet_write(1, "ACK %s\n",
-							sha1_to_hex(last_sha1));
+					packet_write(1, "ACK %s\n", last_hex);
 				return 0;
 			}
 			packet_write(1, "NAK\n");
@@ -166,37 +487,55 @@ static int get_common_commits(void)
 	}
 }
 
-static int receive_needs(void)
+static void receive_needs(void)
 {
+	struct object_array shallows = {0, 0, NULL};
 	static char line[1000];
-	int len, needs;
+	int len, depth = 0;
 
-	needs = 0;
 	for (;;) {
 		struct object *o;
-		unsigned char dummy[20], *sha1_buf;
+		unsigned char sha1_buf[20];
 		len = packet_read_line(0, line, sizeof(line));
 		reset_timeout();
 		if (!len)
-			return needs;
-
-		sha1_buf = dummy;
-		if (needs == MAX_NEEDS) {
-			fprintf(stderr,
-				"warning: supporting only a max of %d requests. "
-				"sending everything instead.\n",
-				MAX_NEEDS);
-		}
-		else if (needs < MAX_NEEDS)
-			sha1_buf = needs_sha1[needs];
+			break;
 
-		if (strncmp("want ", line, 5) || get_sha1_hex(line+5, sha1_buf))
+		if (!strncmp("shallow ", line, 8)) {
+			unsigned char sha1[20];
+			struct object *object;
+			use_thin_pack = 0;
+			if (get_sha1(line + 8, sha1))
+				die("invalid shallow line: %s", line);
+			object = parse_object(sha1);
+			if (!object)
+				die("did not find object for %s", line);
+			object->flags |= CLIENT_SHALLOW;
+			add_object_array(object, NULL, &shallows);
+			continue;
+		}
+		if (!strncmp("deepen ", line, 7)) {
+			char *end;
+			use_thin_pack = 0;
+			depth = strtol(line + 7, &end, 0);
+			if (end == line + 7 || depth <= 0)
+				die("Invalid deepen: %s", line);
+			continue;
+		}
+		if (strncmp("want ", line, 5) ||
+		    get_sha1_hex(line+5, sha1_buf))
 			die("git-upload-pack: protocol error, "
 			    "expected to get sha, not '%s'", line);
 		if (strstr(line+45, "multi_ack"))
 			multi_ack = 1;
 		if (strstr(line+45, "thin-pack"))
 			use_thin_pack = 1;
+		if (strstr(line+45, "ofs-delta"))
+			use_ofs_delta = 1;
+		if (strstr(line+45, "side-band-64k"))
+			use_sideband = LARGE_PACKET_MAX;
+		else if (strstr(line+45, "side-band"))
+			use_sideband = DEFAULT_PACKET_MAX;
 
 		/* We have sent all our refs already, and the other end
 		 * should have chosen out of them; otherwise they are
@@ -211,14 +550,61 @@ static int receive_needs(void)
 			die("git-upload-pack: not our ref %s", line+5);
 		if (!(o->flags & WANTED)) {
 			o->flags |= WANTED;
-			needs++;
+			add_object_array(o, NULL, &want_obj);
 		}
 	}
+	if (depth == 0 && shallows.nr == 0)
+		return;
+	if (depth > 0) {
+		struct commit_list *result, *backup;
+		int i;
+		backup = result = get_shallow_commits(&want_obj, depth,
+			SHALLOW, NOT_SHALLOW);
+		while (result) {
+			struct object *object = &result->item->object;
+			if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
+				packet_write(1, "shallow %s",
+						sha1_to_hex(object->sha1));
+				register_shallow(object->sha1);
+			}
+			result = result->next;
+		}
+		free_commit_list(backup);
+		for (i = 0; i < shallows.nr; i++) {
+			struct object *object = shallows.objects[i].item;
+			if (object->flags & NOT_SHALLOW) {
+				struct commit_list *parents;
+				packet_write(1, "unshallow %s",
+					sha1_to_hex(object->sha1));
+				object->flags &= ~CLIENT_SHALLOW;
+				/* make sure the real parents are parsed */
+				unregister_shallow(object->sha1);
+				object->parsed = 0;
+				parse_commit((struct commit *)object);
+				parents = ((struct commit *)object)->parents;
+				while (parents) {
+					add_object_array(&parents->item->object,
+							NULL, &want_obj);
+					parents = parents->next;
+				}
+			}
+			/* make sure commit traversal conforms to client */
+			register_shallow(object->sha1);
+		}
+		packet_flush(1);
+	} else
+		if (shallows.nr > 0) {
+			int i;
+			for (i = 0; i < shallows.nr; i++)
+				register_shallow(shallows.objects[i].item->sha1);
+		}
+	free(shallows.objects);
 }
 
-static int send_ref(const char *refname, const unsigned char *sha1)
+static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 {
-	static char *capabilities = "multi_ack thin-pack";
+	static const char *capabilities = "multi_ack thin-pack side-band"
+		" side-band-64k ofs-delta shallow";
 	struct object *o = parse_object(sha1);
 
 	if (!o)
@@ -234,25 +620,24 @@ static int send_ref(const char *refname, const unsigned char *sha1)
 		o->flags |= OUR_REF;
 		nr_our_refs++;
 	}
-	if (o->type == tag_type) {
+	if (o->type == OBJ_TAG) {
 		o = deref_tag(o, refname, 0);
 		packet_write(1, "%s %s^{}\n", sha1_to_hex(o->sha1), refname);
 	}
 	return 0;
 }
 
-static int upload_pack(void)
+static void upload_pack(void)
 {
 	reset_timeout();
-	head_ref(send_ref);
-	for_each_ref(send_ref);
+	head_ref(send_ref, NULL);
+	for_each_ref(send_ref, NULL);
 	packet_flush(1);
-	nr_needs = receive_needs();
-	if (!nr_needs)
-		return 0;
-	get_common_commits();
-	create_pack_file();
-	return 0;
+	receive_needs();
+	if (want_obj.nr) {
+		get_common_commits();
+		create_pack_file();
+	}
 }
 
 int main(int argc, char **argv)