send-pack: report signal death of pack-objects
[gitweb.git] / upload-pack.c
index ca7f9417800bfb27a7dbc0559df8bec772c267fa..e0db8b42be2d6ba400da987f8cb2ba573c5eda01 100644 (file)
@@ -15,6 +15,8 @@
 #include "version.h"
 #include "string-list.h"
 #include "parse-options.h"
+#include "argv-array.h"
+#include "prio-queue.h"
 
 static const char * const upload_pack_usage[] = {
        N_("git upload-pack [<options>] <dir>"),
@@ -35,6 +37,7 @@ static const char * const upload_pack_usage[] = {
 
 static unsigned long oldest_have;
 
+static int deepen_relative;
 static int multi_ack;
 static int no_done;
 static int use_thin_pack, use_ofs_delta, use_include_tag;
@@ -281,7 +284,7 @@ static void create_pack_file(void)
        die("git upload-pack: %s", abort_msg);
 }
 
-static int got_sha1(char *hex, unsigned char *sha1)
+static int got_sha1(const char *hex, unsigned char *sha1)
 {
        struct object *o;
        int we_knew_they_have = 0;
@@ -317,12 +320,12 @@ static int got_sha1(char *hex, unsigned char *sha1)
 
 static int reachable(struct commit *want)
 {
-       struct commit_list *work = NULL;
+       struct prio_queue work = { compare_commits_by_commit_date };
 
-       commit_list_insert_by_date(want, &work);
-       while (work) {
+       prio_queue_put(&work, want);
+       while (work.nr) {
                struct commit_list *list;
-               struct commit *commit = pop_commit(&work);
+               struct commit *commit = prio_queue_get(&work);
 
                if (commit->object.flags & THEY_HAVE) {
                        want->object.flags |= COMMON_KNOWN;
@@ -338,12 +341,12 @@ static int reachable(struct commit *want)
                for (list = commit->parents; list; list = list->next) {
                        struct commit *parent = list->item;
                        if (!(parent->object.flags & REACHABLE))
-                               commit_list_insert_by_date(parent, &work);
+                               prio_queue_put(&work, parent);
                }
        }
        want->object.flags |= REACHABLE;
        clear_commit_marks(want, REACHABLE);
-       free_commit_list(work);
+       clear_prio_queue(&work);
        return (want->object.flags & COMMON_KNOWN);
 }
 
@@ -387,19 +390,21 @@ static int get_common_commits(void)
 
        for (;;) {
                char *line = packet_read_line(0, NULL);
+               const char *arg;
+
                reset_timeout();
 
                if (!line) {
                        if (multi_ack == 2 && got_common
                            && !got_other && ok_to_give_up()) {
                                sent_ready = 1;
-                               packet_write(1, "ACK %s ready\n", last_hex);
+                               packet_write_fmt(1, "ACK %s ready\n", last_hex);
                        }
                        if (have_obj.nr == 0 || multi_ack)
-                               packet_write(1, "NAK\n");
+                               packet_write_fmt(1, "NAK\n");
 
                        if (no_done && sent_ready) {
-                               packet_write(1, "ACK %s\n", last_hex);
+                               packet_write_fmt(1, "ACK %s\n", last_hex);
                                return 0;
                        }
                        if (stateless_rpc)
@@ -408,28 +413,28 @@ static int get_common_commits(void)
                        got_other = 0;
                        continue;
                }
-               if (starts_with(line, "have ")) {
-                       switch (got_sha1(line+5, sha1)) {
+               if (skip_prefix(line, "have ", &arg)) {
+                       switch (got_sha1(arg, sha1)) {
                        case -1: /* they have what we do not */
                                got_other = 1;
                                if (multi_ack && ok_to_give_up()) {
                                        const char *hex = sha1_to_hex(sha1);
                                        if (multi_ack == 2) {
                                                sent_ready = 1;
-                                               packet_write(1, "ACK %s ready\n", hex);
+                                               packet_write_fmt(1, "ACK %s ready\n", hex);
                                        } else
-                                               packet_write(1, "ACK %s continue\n", hex);
+                                               packet_write_fmt(1, "ACK %s continue\n", hex);
                                }
                                break;
                        default:
                                got_common = 1;
                                memcpy(last_hex, sha1_to_hex(sha1), 41);
                                if (multi_ack == 2)
-                                       packet_write(1, "ACK %s common\n", last_hex);
+                                       packet_write_fmt(1, "ACK %s common\n", last_hex);
                                else if (multi_ack)
-                                       packet_write(1, "ACK %s continue\n", last_hex);
+                                       packet_write_fmt(1, "ACK %s continue\n", last_hex);
                                else if (have_obj.nr == 1)
-                                       packet_write(1, "ACK %s\n", last_hex);
+                                       packet_write_fmt(1, "ACK %s\n", last_hex);
                                break;
                        }
                        continue;
@@ -437,10 +442,10 @@ static int get_common_commits(void)
                if (!strcmp(line, "done")) {
                        if (have_obj.nr > 0) {
                                if (multi_ack)
-                                       packet_write(1, "ACK %s\n", last_hex);
+                                       packet_write_fmt(1, "ACK %s\n", last_hex);
                                return 0;
                        }
-                       packet_write(1, "NAK\n");
+                       packet_write_fmt(1, "NAK\n");
                        return -1;
                }
                die("git upload-pack: expected SHA1 list, got '%s'", line);
@@ -454,73 +459,136 @@ static int is_our_ref(struct object *o)
        return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
 }
 
-static void check_non_tip(void)
+/*
+ * on successful case, it's up to the caller to close cmd->out
+ */
+static int do_reachable_revlist(struct child_process *cmd,
+                               struct object_array *src,
+                               struct object_array *reachable)
 {
        static const char *argv[] = {
                "rev-list", "--stdin", NULL,
        };
-       static struct child_process cmd = CHILD_PROCESS_INIT;
        struct object *o;
        char namebuf[42]; /* ^ + SHA-1 + LF */
        int i;
 
-       /*
-        * In the normal in-process case without
-        * uploadpack.allowReachableSHA1InWant,
-        * non-tip requests can never happen.
-        */
-       if (!stateless_rpc && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
-               goto error;
-
-       cmd.argv = argv;
-       cmd.git_cmd = 1;
-       cmd.no_stderr = 1;
-       cmd.in = -1;
-       cmd.out = -1;
-
-       if (start_command(&cmd))
-               goto error;
+       cmd->argv = argv;
+       cmd->git_cmd = 1;
+       cmd->no_stderr = 1;
+       cmd->in = -1;
+       cmd->out = -1;
 
        /*
-        * If rev-list --stdin encounters an unknown commit, it
-        * terminates, which will cause SIGPIPE in the write loop
+        * If the next rev-list --stdin encounters an unknown commit,
+        * it terminates, which will cause SIGPIPE in the write loop
         * below.
         */
        sigchain_push(SIGPIPE, SIG_IGN);
 
+       if (start_command(cmd))
+               goto error;
+
        namebuf[0] = '^';
        namebuf[41] = '\n';
        for (i = get_max_object_index(); 0 < i; ) {
                o = get_indexed_object(--i);
                if (!o)
                        continue;
+               if (reachable && o->type == OBJ_COMMIT)
+                       o->flags &= ~TMP_MARK;
                if (!is_our_ref(o))
                        continue;
                memcpy(namebuf + 1, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
-               if (write_in_full(cmd.in, namebuf, 42) < 0)
+               if (write_in_full(cmd->in, namebuf, 42) < 0)
                        goto error;
        }
        namebuf[40] = '\n';
-       for (i = 0; i < want_obj.nr; i++) {
-               o = want_obj.objects[i].item;
-               if (is_our_ref(o))
+       for (i = 0; i < src->nr; i++) {
+               o = src->objects[i].item;
+               if (is_our_ref(o)) {
+                       if (reachable)
+                               add_object_array(o, NULL, reachable);
                        continue;
+               }
+               if (reachable && o->type == OBJ_COMMIT)
+                       o->flags |= TMP_MARK;
                memcpy(namebuf, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
-               if (write_in_full(cmd.in, namebuf, 41) < 0)
+               if (write_in_full(cmd->in, namebuf, 41) < 0)
                        goto error;
        }
-       close(cmd.in);
+       close(cmd->in);
+       cmd->in = -1;
+       sigchain_pop(SIGPIPE);
 
+       return 0;
+
+error:
        sigchain_pop(SIGPIPE);
 
+       if (cmd->in >= 0)
+               close(cmd->in);
+       if (cmd->out >= 0)
+               close(cmd->out);
+       return -1;
+}
+
+static int get_reachable_list(struct object_array *src,
+                             struct object_array *reachable)
+{
+       struct child_process cmd = CHILD_PROCESS_INIT;
+       int i;
+       struct object *o;
+       char namebuf[42]; /* ^ + SHA-1 + LF */
+
+       if (do_reachable_revlist(&cmd, src, reachable) < 0)
+               return -1;
+
+       while ((i = read_in_full(cmd.out, namebuf, 41)) == 41) {
+               struct object_id sha1;
+
+               if (namebuf[40] != '\n' || get_oid_hex(namebuf, &sha1))
+                       break;
+
+               o = lookup_object(sha1.hash);
+               if (o && o->type == OBJ_COMMIT) {
+                       o->flags &= ~TMP_MARK;
+               }
+       }
+       for (i = get_max_object_index(); 0 < i; i--) {
+               o = get_indexed_object(i - 1);
+               if (o && o->type == OBJ_COMMIT &&
+                   (o->flags & TMP_MARK)) {
+                       add_object_array(o, NULL, reachable);
+                               o->flags &= ~TMP_MARK;
+               }
+       }
+       close(cmd.out);
+
+       if (finish_command(&cmd))
+               return -1;
+
+       return 0;
+}
+
+static int has_unreachable(struct object_array *src)
+{
+       struct child_process cmd = CHILD_PROCESS_INIT;
+       char buf[1];
+       int i;
+
+       if (do_reachable_revlist(&cmd, src, NULL) < 0)
+               return 1;
+
        /*
         * The commits out of the rev-list are not ancestors of
         * our ref.
         */
-       i = read_in_full(cmd.out, namebuf, 1);
+       i = read_in_full(cmd.out, buf, 1);
        if (i)
                goto error;
        close(cmd.out);
+       cmd.out = -1;
 
        /*
         * rev-list may have died by encountering a bad commit
@@ -531,23 +599,142 @@ static void check_non_tip(void)
                goto error;
 
        /* All the non-tip ones are ancestors of what we advertised */
-       return;
+       return 0;
+
+error:
+       sigchain_pop(SIGPIPE);
+       if (cmd.out >= 0)
+               close(cmd.out);
+       return 1;
+}
+
+static void check_non_tip(void)
+{
+       int i;
+
+       /*
+        * In the normal in-process case without
+        * uploadpack.allowReachableSHA1InWant,
+        * non-tip requests can never happen.
+        */
+       if (!stateless_rpc && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
+               goto error;
+       if (!has_unreachable(&want_obj))
+               /* All the non-tip ones are ancestors of what we advertised */
+               return;
 
 error:
        /* Pick one of them (we know there at least is one) */
        for (i = 0; i < want_obj.nr; i++) {
-               o = want_obj.objects[i].item;
+               struct object *o = want_obj.objects[i].item;
                if (!is_our_ref(o))
                        die("git upload-pack: not our ref %s",
                            oid_to_hex(&o->oid));
        }
 }
 
+static void send_shallow(struct commit_list *result)
+{
+       while (result) {
+               struct object *object = &result->item->object;
+               if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
+                       packet_write_fmt(1, "shallow %s",
+                                        oid_to_hex(&object->oid));
+                       register_shallow(object->oid.hash);
+                       shallow_nr++;
+               }
+               result = result->next;
+       }
+}
+
+static void send_unshallow(const struct object_array *shallows)
+{
+       int i;
+
+       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_fmt(1, "unshallow %s",
+                                        oid_to_hex(&object->oid));
+                       object->flags &= ~CLIENT_SHALLOW;
+                       /*
+                        * We want to _register_ "object" as shallow, but we
+                        * also need to traverse object's parents to deepen a
+                        * shallow clone. Unregister it for now so we can
+                        * parse and add the parents to the want list, then
+                        * re-register it.
+                        */
+                       unregister_shallow(object->oid.hash);
+                       object->parsed = 0;
+                       parse_commit_or_die((struct commit *)object);
+                       parents = ((struct commit *)object)->parents;
+                       while (parents) {
+                               add_object_array(&parents->item->object,
+                                                NULL, &want_obj);
+                               parents = parents->next;
+                       }
+                       add_object_array(object, NULL, &extra_edge_obj);
+               }
+               /* make sure commit traversal conforms to client */
+               register_shallow(object->oid.hash);
+       }
+}
+
+static void deepen(int depth, int deepen_relative,
+                  struct object_array *shallows)
+{
+       if (depth == INFINITE_DEPTH && !is_repository_shallow()) {
+               int i;
+
+               for (i = 0; i < shallows->nr; i++) {
+                       struct object *object = shallows->objects[i].item;
+                       object->flags |= NOT_SHALLOW;
+               }
+       } else if (deepen_relative) {
+               struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
+               struct commit_list *result;
+
+               get_reachable_list(shallows, &reachable_shallows);
+               result = get_shallow_commits(&reachable_shallows,
+                                            depth + 1,
+                                            SHALLOW, NOT_SHALLOW);
+               send_shallow(result);
+               free_commit_list(result);
+               object_array_clear(&reachable_shallows);
+       } else {
+               struct commit_list *result;
+
+               result = get_shallow_commits(&want_obj, depth,
+                                            SHALLOW, NOT_SHALLOW);
+               send_shallow(result);
+               free_commit_list(result);
+       }
+
+       send_unshallow(shallows);
+       packet_flush(1);
+}
+
+static void deepen_by_rev_list(int ac, const char **av,
+                              struct object_array *shallows)
+{
+       struct commit_list *result;
+
+       result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
+       send_shallow(result);
+       free_commit_list(result);
+       send_unshallow(shallows);
+       packet_flush(1);
+}
+
 static void receive_needs(void)
 {
        struct object_array shallows = OBJECT_ARRAY_INIT;
+       struct string_list deepen_not = STRING_LIST_INIT_DUP;
        int depth = 0;
        int has_non_tip = 0;
+       unsigned long deepen_since = 0;
+       int deepen_rev_list = 0;
 
        shallow_nr = 0;
        for (;;) {
@@ -555,14 +742,16 @@ static void receive_needs(void)
                const char *features;
                unsigned char sha1_buf[20];
                char *line = packet_read_line(0, NULL);
+               const char *arg;
+
                reset_timeout();
                if (!line)
                        break;
 
-               if (starts_with(line, "shallow ")) {
+               if (skip_prefix(line, "shallow ", &arg)) {
                        unsigned char sha1[20];
                        struct object *object;
-                       if (get_sha1_hex(line + 8, sha1))
+                       if (get_sha1_hex(arg, sha1))
                                die("invalid shallow line: %s", line);
                        object = parse_object(sha1);
                        if (!object)
@@ -575,20 +764,42 @@ static void receive_needs(void)
                        }
                        continue;
                }
-               if (starts_with(line, "deepen ")) {
-                       char *end;
-                       depth = strtol(line + 7, &end, 0);
-                       if (end == line + 7 || depth <= 0)
+               if (skip_prefix(line, "deepen ", &arg)) {
+                       char *end = NULL;
+                       depth = strtol(arg, &end, 0);
+                       if (!end || *end || depth <= 0)
                                die("Invalid deepen: %s", line);
                        continue;
                }
-               if (!starts_with(line, "want ") ||
-                   get_sha1_hex(line+5, sha1_buf))
+               if (skip_prefix(line, "deepen-since ", &arg)) {
+                       char *end = NULL;
+                       deepen_since = strtoul(arg, &end, 0);
+                       if (!end || *end || !deepen_since ||
+                           /* revisions.c's max_age -1 is special */
+                           deepen_since == -1)
+                               die("Invalid deepen-since: %s", line);
+                       deepen_rev_list = 1;
+                       continue;
+               }
+               if (skip_prefix(line, "deepen-not ", &arg)) {
+                       char *ref = NULL;
+                       unsigned char sha1[20];
+                       if (expand_ref(arg, strlen(arg), sha1, &ref) != 1)
+                               die("git upload-pack: ambiguous deepen-not: %s", line);
+                       string_list_append(&deepen_not, ref);
+                       free(ref);
+                       deepen_rev_list = 1;
+                       continue;
+               }
+               if (!skip_prefix(line, "want ", &arg) ||
+                   get_sha1_hex(arg, sha1_buf))
                        die("git upload-pack: protocol error, "
                            "expected to get sha, not '%s'", line);
 
-               features = line + 45;
+               features = arg + 40;
 
+               if (parse_feature_request(features, "deepen-relative"))
+                       deepen_relative = 1;
                if (parse_feature_request(features, "multi_ack_detailed"))
                        multi_ack = 2;
                else if (parse_feature_request(features, "multi_ack"))
@@ -633,55 +844,35 @@ static void receive_needs(void)
        if (!use_sideband && daemon_mode)
                no_progress = 1;
 
-       if (depth == 0 && shallows.nr == 0)
+       if (depth == 0 && !deepen_rev_list && shallows.nr == 0)
                return;
-       if (depth > 0) {
-               struct commit_list *result = NULL, *backup = NULL;
+       if (depth > 0 && deepen_rev_list)
+               die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
+       if (depth > 0)
+               deepen(depth, deepen_relative, &shallows);
+       else if (deepen_rev_list) {
+               struct argv_array av = ARGV_ARRAY_INIT;
                int i;
-               if (depth == INFINITE_DEPTH && !is_repository_shallow())
-                       for (i = 0; i < shallows.nr; i++) {
-                               struct object *object = shallows.objects[i].item;
-                               object->flags |= NOT_SHALLOW;
-                       }
-               else
-                       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",
-                                               oid_to_hex(&object->oid));
-                               register_shallow(object->oid.hash);
-                               shallow_nr++;
+
+               argv_array_push(&av, "rev-list");
+               if (deepen_since)
+                       argv_array_pushf(&av, "--max-age=%lu", deepen_since);
+               if (deepen_not.nr) {
+                       argv_array_push(&av, "--not");
+                       for (i = 0; i < deepen_not.nr; i++) {
+                               struct string_list_item *s = deepen_not.items + i;
+                               argv_array_push(&av, s->string);
                        }
-                       result = result->next;
+                       argv_array_push(&av, "--not");
                }
-               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",
-                                       oid_to_hex(&object->oid));
-                               object->flags &= ~CLIENT_SHALLOW;
-                               /* make sure the real parents are parsed */
-                               unregister_shallow(object->oid.hash);
-                               object->parsed = 0;
-                               parse_commit_or_die((struct commit *)object);
-                               parents = ((struct commit *)object)->parents;
-                               while (parents) {
-                                       add_object_array(&parents->item->object,
-                                                       NULL, &want_obj);
-                                       parents = parents->next;
-                               }
-                               add_object_array(object, NULL, &extra_edge_obj);
-                       }
-                       /* make sure commit traversal conforms to client */
-                       register_shallow(object->oid.hash);
+               for (i = 0; i < want_obj.nr; i++) {
+                       struct object *o = want_obj.objects[i].item;
+                       argv_array_push(&av, oid_to_hex(&o->oid));
                }
-               packet_flush(1);
-       } else
+               deepen_by_rev_list(av.argc, av.argv, &shallows);
+               argv_array_clear(&av);
+       }
+       else
                if (shallows.nr > 0) {
                        int i;
                        for (i = 0; i < shallows.nr; i++)
@@ -729,8 +920,8 @@ static int send_ref(const char *refname, const struct object_id *oid,
                    int flag, void *cb_data)
 {
        static const char *capabilities = "multi_ack thin-pack side-band"
-               " side-band-64k ofs-delta shallow no-progress"
-               " include-tag multi_ack_detailed";
+               " side-band-64k ofs-delta shallow deepen-since deepen-not"
+               " deepen-relative no-progress include-tag multi_ack_detailed";
        const char *refname_nons = strip_namespace(refname);
        struct object_id peeled;
 
@@ -741,7 +932,7 @@ static int send_ref(const char *refname, const struct object_id *oid,
                struct strbuf symref_info = STRBUF_INIT;
 
                format_symref_info(&symref_info, cb_data);
-               packet_write(1, "%s %s%c%s%s%s%s%s agent=%s\n",
+               packet_write_fmt(1, "%s %s%c%s%s%s%s%s agent=%s\n",
                             oid_to_hex(oid), refname_nons,
                             0, capabilities,
                             (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
@@ -753,11 +944,11 @@ static int send_ref(const char *refname, const struct object_id *oid,
                             git_user_agent_sanitized());
                strbuf_release(&symref_info);
        } else {
-               packet_write(1, "%s %s\n", oid_to_hex(oid), refname_nons);
+               packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
        }
        capabilities = NULL;
        if (!peel_ref(refname, peeled.hash))
-               packet_write(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
+               packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
        return 0;
 }