Teach fast-import to import subtrees named by tree id

diff --git a/upload-pack.c b/upload-pack.c
index 0ea8516ebf6825536cf85032e46755855f53909b..dc464d78b35659705ffb0cd233b80ab27e24e8bc 100644 (file)
--- a/upload-pack.c
+++ b/upload-pack.c
@@ -39,6 +39,8 @@ static unsigned int timeout;
  */
 static int use_sideband;
 static int debug_fd;
+static int advertise_refs;
+static int stateless_rpc;
 
 static void reset_timeout(void)
 {
@@ -103,12 +105,12 @@ static void show_edge(struct commit *commit)
        fprintf(pack_pipe, "-%s\n", sha1_to_hex(commit->object.sha1));
 }
 
-static int do_rev_list(int fd, void *create_full_pack)
+static int do_rev_list(int in, int out, void *create_full_pack)
 {
        int i;
        struct rev_info revs;
 
-       pack_pipe = xfdopen(fd, "w");
+       pack_pipe = xfdopen(out, "w");
        init_revisions(&revs, NULL);
        revs.tag_objects = 1;
        revs.tree_objects = 1;
@@ -160,8 +162,9 @@ static void create_pack_file(void)
        int arg = 0;
 
        if (shallow_nr) {
+               memset(&rev_list, 0, sizeof(rev_list));
                rev_list.proc = do_rev_list;
-               rev_list.data = 0;
+               rev_list.out = -1;
                if (start_async(&rev_list))
                        die("git upload-pack: unable to fork git-rev-list");
                argv[arg++] = "pack-objects";
@@ -430,7 +433,7 @@ static int get_common_commits(void)
 {
        static char line[1000];
        unsigned char sha1[20];
-       char hex[41], last_hex[41];
+       char last_hex[41];
 
        save_commit_buffer = 0;
 
@@ -441,25 +444,30 @@ static int get_common_commits(void)
                if (!len) {
                        if (have_obj.nr == 0 || multi_ack)
                                packet_write(1, "NAK\n");
+                       if (stateless_rpc)
+                               exit(0);
                        continue;
                }
                strip(line, len);
                if (!prefixcmp(line, "have ")) {
                        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));
+                               if (multi_ack && ok_to_give_up()) {
+                                       const char *hex = sha1_to_hex(sha1);
+                                       if (multi_ack == 2)
+                                               packet_write(1, "ACK %s ready\n", hex);
+                                       else
+                                               packet_write(1, "ACK %s continue\n", hex);
+                               }
                                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);
-                               }
+                               memcpy(last_hex, sha1_to_hex(sha1), 41);
+                               if (multi_ack == 2)
+                                       packet_write(1, "ACK %s common\n", last_hex);
+                               else if (multi_ack)
+                                       packet_write(1, "ACK %s continue\n", last_hex);
                                else if (have_obj.nr == 1)
-                                       packet_write(1, "ACK %s\n", hex);
+                                       packet_write(1, "ACK %s\n", last_hex);
                                break;
                        }
                        continue;
@@ -519,7 +527,9 @@ static void receive_needs(void)
                    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"))
+               if (strstr(line+45, "multi_ack_detailed"))
+                       multi_ack = 2;
+               else if (strstr(line+45, "multi_ack"))
                        multi_ack = 1;
                if (strstr(line+45, "thin-pack"))
                        use_thin_pack = 1;
@@ -613,7 +623,7 @@ static int send_ref(const char *refname, const unsigned char *sha1, int flag, vo
 {
        static const char *capabilities = "multi_ack thin-pack side-band"
                " side-band-64k ofs-delta shallow no-progress"
-               " include-tag";
+               " include-tag multi_ack_detailed";
        struct object *o = parse_object(sha1);
 
        if (!o)
@@ -637,12 +647,32 @@ static int send_ref(const char *refname, const unsigned char *sha1, int flag, vo
        return 0;
 }
 
+static int mark_our_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
+{
+       struct object *o = parse_object(sha1);
+       if (!o)
+               die("git upload-pack: cannot find object %s:", sha1_to_hex(sha1));
+       if (!(o->flags & OUR_REF)) {
+               o->flags |= OUR_REF;
+               nr_our_refs++;
+       }
+       return 0;
+}
+
 static void upload_pack(void)
 {
-       reset_timeout();
-       head_ref(send_ref, NULL);
-       for_each_ref(send_ref, NULL);
-       packet_flush(1);
+       if (advertise_refs || !stateless_rpc) {
+               reset_timeout();
+               head_ref(send_ref, NULL);
+               for_each_ref(send_ref, NULL);
+               packet_flush(1);
+       } else {
+               head_ref(mark_our_ref, NULL);
+               for_each_ref(mark_our_ref, NULL);
+       }
+       if (advertise_refs)
+               return;
+
        receive_needs();
        if (want_obj.nr) {
                get_common_commits();
@@ -664,6 +694,14 @@ int main(int argc, char **argv)
 
                if (arg[0] != '-')
                        break;
+               if (!strcmp(arg, "--advertise-refs")) {
+                       advertise_refs = 1;
+                       continue;
+               }
+               if (!strcmp(arg, "--stateless-rpc")) {
+                       stateless_rpc = 1;
+                       continue;
+               }
                if (!strcmp(arg, "--strict")) {
                        strict = 1;
                        continue;