Merge branch 'jt/accept-capability-advertisement-when-fetching-from-void'
[git/git.git] / connect.c
index 722dc3f..7224b5e 100644 (file)
--- a/connect.c
+++ b/connect.c
@@ -43,9 +43,9 @@ int check_ref_type(const struct ref *ref, int flags)
        return check_ref(ref->name, flags);
 }
 
-static void die_initial_contact(int got_at_least_one_head)
+static void die_initial_contact(int unexpected)
 {
-       if (got_at_least_one_head)
+       if (unexpected)
                die("The remote end hung up upon initial contact");
        else
                die("Could not read from remote repository.\n\n"
@@ -115,10 +115,18 @@ struct ref **get_remote_heads(int in, char *src_buf, size_t src_len,
                              struct sha1_array *shallow_points)
 {
        struct ref **orig_list = list;
-       int got_at_least_one_head = 0;
+
+       /*
+        * A hang-up after seeing some response from the other end
+        * means that it is unexpected, as we know the other end is
+        * willing to talk to us.  A hang-up before seeing any
+        * response does not necessarily mean an ACL problem, though.
+        */
+       int saw_response;
+       int got_dummy_ref_with_capabilities_declaration = 0;
 
        *list = NULL;
-       for (;;) {
+       for (saw_response = 0; ; saw_response = 1) {
                struct ref *ref;
                struct object_id old_oid;
                char *name;
@@ -131,7 +139,7 @@ struct ref **get_remote_heads(int in, char *src_buf, size_t src_len,
                                  PACKET_READ_GENTLE_ON_EOF |
                                  PACKET_READ_CHOMP_NEWLINE);
                if (len < 0)
-                       die_initial_contact(got_at_least_one_head);
+                       die_initial_contact(saw_response);
 
                if (!len)
                        break;
@@ -165,13 +173,25 @@ struct ref **get_remote_heads(int in, char *src_buf, size_t src_len,
                        continue;
                }
 
+               if (!strcmp(name, "capabilities^{}")) {
+                       if (saw_response)
+                               die("protocol error: unexpected capabilities^{}");
+                       if (got_dummy_ref_with_capabilities_declaration)
+                               die("protocol error: multiple capabilities^{}");
+                       got_dummy_ref_with_capabilities_declaration = 1;
+                       continue;
+               }
+
                if (!check_ref(name, flags))
                        continue;
+
+               if (got_dummy_ref_with_capabilities_declaration)
+                       die("protocol error: unexpected ref after capabilities^{}");
+
                ref = alloc_ref(buffer + GIT_SHA1_HEXSZ + 1);
                oidcpy(&ref->old_oid, &old_oid);
                *list = ref;
                list = &ref->next;
-               got_at_least_one_head = 1;
        }
 
        annotate_refs_with_symref_info(*orig_list);