X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=fetch-pack.c;h=d34f322477a9a072da3981c7ba49c87232ed8bc4;hb=d5a6aafc90a14382120727e4e81ee1a380e8b194;hp=ec5bad89cdb3f6eae038877856f2eefb1125bf6f;hpb=b43d44779bf98977b211256f936d0edda8a9625a;p=git.git

diff --git a/fetch-pack.c b/fetch-pack.c
index ec5bad89..d34f3224 100644
--- a/fetch-pack.c
+++ b/fetch-pack.c
@@ -1,30 +1,178 @@
 #include "cache.h"
 #include "refs.h"
 #include "pkt-line.h"
-#include <sys/wait.h>
+#include "commit.h"
+#include "tag.h"
 
-static const char fetch_pack_usage[] = "git-fetch-pack [host:]directory [heads]* < mycommitlist";
+static int keep_pack;
+static int quiet;
+static int verbose;
+static const char fetch_pack_usage[] =
+"git-fetch-pack [-q] [-v] [-k] [--exec=upload-pack] [host:]directory <refs>...";
 static const char *exec = "git-upload-pack";
 
-static int find_common(int fd[2], unsigned char *result_sha1, unsigned char *remote)
+#define COMPLETE	(1U << 0)
+#define COMMON		(1U << 1)
+#define COMMON_REF	(1U << 2)
+#define SEEN		(1U << 3)
+#define POPPED		(1U << 4)
+
+static struct commit_list *rev_list = NULL;
+static int non_common_revs = 0, multi_ack = 0;
+
+static void rev_list_push(struct commit *commit, int mark)
+{
+	if (!(commit->object.flags & mark)) {
+		commit->object.flags |= mark;
+
+		if (!(commit->object.parsed))
+			parse_commit(commit);
+
+		insert_by_date(commit, &rev_list);
+
+		if (!(commit->object.flags & COMMON))
+			non_common_revs++;
+	}
+}
+
+static int rev_list_insert_ref(const char *path, const unsigned char *sha1)
+{
+	struct object *o = deref_tag(parse_object(sha1), path, 0);
+
+	if (o && o->type == commit_type)
+		rev_list_push((struct commit *)o, SEEN);
+
+	return 0;
+}
+
+/*
+   This function marks a rev and its ancestors as common.
+   In some cases, it is desirable to mark only the ancestors (for example
+   when only the server does not yet know that they are common).
+*/
+
+static void mark_common(struct commit *commit,
+		int ancestors_only, int dont_parse)
 {
-	static char line[1000];
+	if (commit != NULL && !(commit->object.flags & COMMON)) {
+		struct object *o = (struct object *)commit;
+
+		if (!ancestors_only)
+			o->flags |= COMMON;
+
+		if (!(o->flags & SEEN))
+			rev_list_push(commit, SEEN);
+		else {
+			struct commit_list *parents;
+
+			if (!ancestors_only && !(o->flags & POPPED))
+				non_common_revs--;
+			if (!o->parsed && !dont_parse)
+				parse_commit(commit);
+
+			for (parents = commit->parents;
+					parents;
+					parents = parents->next)
+				mark_common(parents->item, 0, dont_parse);
+		}
+	}
+}
+
+/*
+  Get the next rev to send, ignoring the common.
+*/
+
+static const unsigned char* get_rev()
+{
+	struct commit *commit = NULL;
+
+	while (commit == NULL) {
+		unsigned int mark;
+		struct commit_list* parents;
+
+		if (rev_list == NULL || non_common_revs == 0)
+			return NULL;
+
+		commit = rev_list->item;
+		if (!(commit->object.parsed))
+			parse_commit(commit);
+		commit->object.flags |= POPPED;
+		if (!(commit->object.flags & COMMON))
+			non_common_revs--;
+	
+		parents = commit->parents;
+
+		if (commit->object.flags & COMMON) {
+			/* do not send "have", and ignore ancestors */
+			commit = NULL;
+			mark = COMMON | SEEN;
+		} else if (commit->object.flags & COMMON_REF)
+			/* send "have", and ignore ancestors */
+			mark = COMMON | SEEN;
+		else
+			/* send "have", also for its ancestors */
+			mark = SEEN;
+
+		while (parents) {
+			if (!(parents->item->object.flags & SEEN))
+				rev_list_push(parents->item, mark);
+			if (mark & COMMON)
+				mark_common(parents->item, 1, 0);
+			parents = parents->next;
+		}
+
+		rev_list = rev_list->next;
+	}
+
+	return commit->object.sha1;
+}
+
+static int find_common(int fd[2], unsigned char *result_sha1,
+		       struct ref *refs)
+{
+	int fetching;
 	int count = 0, flushes = 0, retval;
-	FILE *revs;
+	const unsigned char *sha1;
+
+	for_each_ref(rev_list_insert_ref);
 
-	revs = popen("git-rev-list $(git-rev-parse --all)", "r");
-	if (!revs)
-		die("unable to run 'git-rev-list'");
-	packet_write(fd[1], "want %s\n", sha1_to_hex(remote));
+	fetching = 0;
+	for ( ; refs ; refs = refs->next) {
+		unsigned char *remote = refs->old_sha1;
+		struct object *o;
+
+		/*
+		 * If that object is complete (i.e. it is an ancestor of a
+		 * local ref), we tell them we have it but do not have to
+		 * tell them about its ancestors, which they already know
+		 * about.
+		 *
+		 * We use lookup_object here because we are only
+		 * interested in the case we *know* the object is
+		 * reachable and we have already scanned it.
+		 */
+		if (((o = lookup_object(remote)) != NULL) &&
+				(o->flags & COMPLETE)) {
+			continue;
+		}
+
+		packet_write(fd[1], "want %s%s\n", sha1_to_hex(remote),
+			multi_ack ? " multi_ack" : "");
+		fetching++;
+	}
 	packet_flush(fd[1]);
-	flushes = 1;
+	if (!fetching)
+		return 1;
+
+	flushes = 0;
 	retval = -1;
-	while (fgets(line, sizeof(line), revs) != NULL) {
-		unsigned char sha1[20];
-		if (get_sha1_hex(line, sha1))
-			die("git-fetch-pack: expected object name, got crud");
+	while ((sha1 = get_rev())) {
 		packet_write(fd[1], "have %s\n", sha1_to_hex(sha1));
+		if (verbose)
+			fprintf(stderr, "have %s\n", sha1_to_hex(sha1));
 		if (!(31 & ++count)) {
+			int ack;
+
 			packet_flush(fd[1]);
 			flushes++;
 
@@ -34,91 +182,219 @@ static int find_common(int fd[2], unsigned char *result_sha1, unsigned char *rem
 			 */
 			if (count == 32)
 				continue;
-			if (get_ack(fd[0], result_sha1)) {
-				flushes = 0;
-				retval = 0;
-				break;
-			}
+
+			do {
+				ack = get_ack(fd[0], result_sha1);
+				if (verbose && ack)
+					fprintf(stderr, "got ack %d %s\n", ack,
+							sha1_to_hex(result_sha1));
+				if (ack == 1) {
+					flushes = 0;
+					multi_ack = 0;
+					retval = 0;
+					goto done;
+				} else if (ack == 2) {
+					struct commit *commit =
+						lookup_commit(result_sha1);
+					mark_common(commit, 0, 1);
+					retval = 0;
+				}
+			} while (ack);
 			flushes--;
 		}
 	}
-	pclose(revs);
+done:
 	packet_write(fd[1], "done\n");
-	while (flushes) {
+	if (verbose)
+		fprintf(stderr, "done\n");
+	if (retval != 0) {
+		multi_ack = 0;
+		flushes++;
+	}
+	while (flushes || multi_ack) {
+		int ack = get_ack(fd[0], result_sha1);
+		if (ack) {
+			if (verbose)
+				fprintf(stderr, "got ack (%d) %s\n", ack,
+					sha1_to_hex(result_sha1));
+			if (ack == 1)
+				return 0;
+			multi_ack = 1;
+			continue;
+		}
 		flushes--;
-		if (get_ack(fd[0], result_sha1))
-			return 0;
 	}
 	return retval;
 }
 
-static int get_remote_heads(int fd, int nr_match, char **match, unsigned char *result)
+static struct commit_list *complete = NULL;
+
+static int mark_complete(const char *path, const unsigned char *sha1)
+{
+	struct object *o = parse_object(sha1);
+
+	while (o && o->type == tag_type) {
+		struct tag *t = (struct tag *) o;
+		if (!t->tagged)
+			break; /* broken repository */
+		o->flags |= COMPLETE;
+		o = parse_object(t->tagged->sha1);
+	}
+	if (o && o->type == commit_type) {
+		struct commit *commit = (struct commit *)o;
+		commit->object.flags |= COMPLETE;
+		insert_by_date(commit, &complete);
+	}
+	return 0;
+}
+
+static void mark_recent_complete_commits(unsigned long cutoff)
+{
+	while (complete && cutoff <= complete->item->date) {
+		if (verbose)
+			fprintf(stderr, "Marking %s as complete\n",
+				sha1_to_hex(complete->item->object.sha1));
+		pop_most_recent_commit(&complete, COMPLETE);
+	}
+}
+
+static void filter_refs(struct ref **refs, int nr_match, char **match)
 {
-	int count = 0;
-
-	for (;;) {
-		static char line[1000];
-		unsigned char sha1[20];
-		char *refname;
-		int len;
-
-		len = packet_read_line(fd, line, sizeof(line));
-		if (!len)
-			break;
-		if (line[len-1] == '\n')
-			line[--len] = 0;
-		if (len < 42 || get_sha1_hex(line, sha1))
-			die("git-fetch-pack: protocol error - expected ref descriptor, got '%s¤'", line);
-		refname = line+41;
-		if (nr_match && !path_match(refname, nr_match, match))
+	struct ref *prev, *current, *next;
+
+	if (!nr_match)
+		return;
+
+	for (prev = NULL, current = *refs; current; current = next) {
+		next = current->next;
+		if ((!memcmp(current->name, "refs/", 5) &&
+					check_ref_format(current->name + 5)) ||
+				!path_match(current->name, nr_match, match)) {
+			if (prev == NULL)
+				*refs = next;
+			else
+				prev->next = next;
+			free(current);
+		} else
+			prev = current;
+	}
+}
+
+static int everything_local(struct ref **refs, int nr_match, char **match)
+{
+	struct ref *ref;
+	int retval;
+	unsigned long cutoff = 0;
+
+	track_object_refs = 0;
+	save_commit_buffer = 0;
+
+	for (ref = *refs; ref; ref = ref->next) {
+		struct object *o;
+
+		o = parse_object(ref->old_sha1);
+		if (!o)
 			continue;
-		count++;
-		memcpy(result, sha1, 20);
+
+		/* We already have it -- which may mean that we were
+		 * in sync with the other side at some time after
+		 * that (it is OK if we guess wrong here).
+		 */
+		if (o->type == commit_type) {
+			struct commit *commit = (struct commit *)o;
+			if (!cutoff || cutoff < commit->date)
+				cutoff = commit->date;
+		}
+	}
+
+	for_each_ref(mark_complete);
+	if (cutoff)
+		mark_recent_complete_commits(cutoff);
+
+	/*
+	 * Mark all complete remote refs as common refs.
+	 * Don't mark them common yet; the server has to be told so first.
+	 */
+	for (ref = *refs; ref; ref = ref->next) {
+		struct object *o = deref_tag(lookup_object(ref->old_sha1),
+					     NULL, 0);
+
+		if (!o || o->type != commit_type || !(o->flags & COMPLETE))
+			continue;
+
+		if (!(o->flags & SEEN)) {
+			rev_list_push((struct commit *)o, COMMON_REF | SEEN);
+
+			mark_common((struct commit *)o, 1, 1);
+		}
 	}
-	return count;
+
+	filter_refs(refs, nr_match, match);
+
+	for (retval = 1, ref = *refs; ref ; ref = ref->next) {
+		const unsigned char *remote = ref->old_sha1;
+		unsigned char local[20];
+		struct object *o;
+
+		o = lookup_object(remote);
+		if (!o || !(o->flags & COMPLETE)) {
+			retval = 0;
+			if (!verbose)
+				continue;
+			fprintf(stderr,
+				"want %s (%s)\n", sha1_to_hex(remote),
+				ref->name);
+			continue;
+		}
+
+		memcpy(ref->new_sha1, local, 20);
+		if (!verbose)
+			continue;
+		fprintf(stderr,
+			"already have %s (%s)\n", sha1_to_hex(remote),
+			ref->name);
+	}
+	return retval;
 }
 
 static int fetch_pack(int fd[2], int nr_match, char **match)
 {
-	unsigned char sha1[20], remote[20];
-	int heads, status;
-	pid_t pid;
+	struct ref *ref;
+	unsigned char sha1[20];
+	int status;
 
-	heads = get_remote_heads(fd[0], nr_match, match, remote);
-	if (heads != 1) {
+	get_remote_heads(fd[0], &ref, 0, NULL, 0);
+	if (server_supports("multi_ack")) {
+		if (verbose)
+			fprintf(stderr, "Server supports multi_ack\n");
+		multi_ack = 1;
+	}
+	if (!ref) {
 		packet_flush(fd[1]);
-		die(heads ? "multiple remote heads" : "no matching remote head");
+		die("no matching remote head");
 	}
-	if (find_common(fd, sha1, remote) < 0)
-		die("git-fetch-pack: no common commits");
-	pid = fork();
-	if (pid < 0)
-		die("git-fetch-pack: unable to fork off git-unpack-objects");
-	if (!pid) {
-		close(fd[1]);
-		dup2(fd[0], 0);
-		close(fd[0]);
-		execlp("git-unpack-objects", "git-unpack-objects", NULL);
-		die("git-unpack-objects exec failed");
+	if (everything_local(&ref, nr_match, match)) {
+		packet_flush(fd[1]);
+		goto all_done;
 	}
-	close(fd[0]);
-	close(fd[1]);
-	while (waitpid(pid, &status, 0) < 0) {
-		if (errno != EINTR)
-			die("waiting for git-unpack-objects: %s", strerror(errno));
-	}
-	if (WIFEXITED(status)) {
-		int code = WEXITSTATUS(status);
-		if (code)
-			die("git-unpack-objects died with error code %d", code);
-		puts(sha1_to_hex(remote));
-		return 0;
-	}
-	if (WIFSIGNALED(status)) {
-		int sig = WTERMSIG(status);
-		die("git-unpack-objects died of signal %d", sig);
-	}
-	die("Sherlock Holmes! git-unpack-objects died of unnatural causes %d!", status);
+	if (find_common(fd, sha1, ref) < 0)
+		fprintf(stderr, "warning: no common commits\n");
+
+	if (keep_pack)
+		status = receive_keep_pack(fd, "git-fetch-pack");
+	else
+		status = receive_unpack_pack(fd, "git-fetch-pack", quiet);
+
+	if (status)
+		die("git-fetch-pack: fetch failed.");
+
+ all_done:
+	while (ref) {
+		printf("%s %s\n",
+		       sha1_to_hex(ref->old_sha1), ref->name);
+		ref = ref->next;
+	}
+	return 0;
 }
 
 int main(int argc, char **argv)
@@ -128,13 +404,30 @@ int main(int argc, char **argv)
 	int fd[2];
 	pid_t pid;
 
+	setup_git_directory();
+
 	nr_heads = 0;
 	heads = NULL;
 	for (i = 1; i < argc; i++) {
 		char *arg = argv[i];
 
 		if (*arg == '-') {
-			/* Arguments go here */
+			if (!strncmp("--exec=", arg, 7)) {
+				exec = arg + 7;
+				continue;
+			}
+			if (!strcmp("--quiet", arg) || !strcmp("-q", arg)) {
+				quiet = 1;
+				continue;
+			}
+			if (!strcmp("--keep", arg) || !strcmp("-k", arg)) {
+				keep_pack = 1;
+				continue;
+			}
+			if (!strcmp("-v", arg)) {
+				verbose = 1;
+				continue;
+			}
 			usage(fetch_pack_usage);
 		}
 		dest = arg;
@@ -151,5 +444,19 @@ int main(int argc, char **argv)
 	close(fd[0]);
 	close(fd[1]);
 	finish_connect(pid);
+
+	if (!ret && nr_heads) {
+		/* If the heads to pull were given, we should have
+		 * consumed all of them by matching the remote.
+		 * Otherwise, 'git-fetch remote no-such-ref' would
+		 * silently succeed without issuing an error.
+		 */
+		for (i = 0; i < nr_heads; i++)
+			if (heads[i] && heads[i][0]) {
+				error("no such remote ref %s", heads[i]);
+				ret = 1;
+			}
+	}
+
 	return ret;
 }