Merge branch 'ph/push-doc-cas'

diff --git a/send-pack.c b/send-pack.c
index 25947d7df9dd3af6e665d5d5eb63ec970617aef1..9d2b0c52ed8235425795772db99fc14ea9c2bf2b 100644 (file)
--- a/send-pack.c
+++ b/send-pack.c
@@ -193,10 +193,13 @@ static void advertise_shallow_grafts_buf(struct strbuf *sb)
        for_each_commit_graft(advertise_shallow_grafts_cb, sb);
 }
 
-static int ref_update_to_be_sent(const struct ref *ref, const struct send_pack_args *args)
+#define CHECK_REF_NO_PUSH -1
+#define CHECK_REF_STATUS_REJECTED -2
+#define CHECK_REF_UPTODATE -3
+static int check_to_send_update(const struct ref *ref, const struct send_pack_args *args)
 {
        if (!ref->peer_ref && !args->send_mirror)
-               return 0;
+               return CHECK_REF_NO_PUSH;
 
        /* Check for statuses set by set_ref_status_for_push() */
        switch (ref->status) {
@@ -206,10 +209,11 @@ static int ref_update_to_be_sent(const struct ref *ref, const struct send_pack_a
        case REF_STATUS_REJECT_NEEDS_FORCE:
        case REF_STATUS_REJECT_STALE:
        case REF_STATUS_REJECT_NODELETE:
+               return CHECK_REF_STATUS_REJECTED;
        case REF_STATUS_UPTODATE:
-               return 0;
+               return CHECK_REF_UPTODATE;
        default:
-               return 1;
+               return 0;
        }
 }
 
@@ -253,7 +257,7 @@ static int generate_push_cert(struct strbuf *req_buf,
        strbuf_addstr(&cert, "\n");
 
        for (ref = remote_refs; ref; ref = ref->next) {
-               if (!ref_update_to_be_sent(ref, args))
+               if (check_to_send_update(ref, args) < 0)
                        continue;
                update_seen = 1;
                strbuf_addf(&cert, "%s %s %s\n",
@@ -281,6 +285,29 @@ static int generate_push_cert(struct strbuf *req_buf,
        return update_seen;
 }
 
+
+static int atomic_push_failure(struct send_pack_args *args,
+                              struct ref *remote_refs,
+                              struct ref *failing_ref)
+{
+       struct ref *ref;
+       /* Mark other refs as failed */
+       for (ref = remote_refs; ref; ref = ref->next) {
+               if (!ref->peer_ref && !args->send_mirror)
+                       continue;
+
+               switch (ref->status) {
+               case REF_STATUS_EXPECTING_REPORT:
+                       ref->status = REF_STATUS_ATOMIC_PUSH_FAILED;
+                       continue;
+               default:
+                       break; /* do nothing */
+               }
+       }
+       return error("atomic push failed for ref %s. status: %d\n",
+                    failing_ref->name, failing_ref->status);
+}
+
 int send_pack(struct send_pack_args *args,
              int fd[], struct child_process *conn,
              struct ref *remote_refs,
@@ -297,6 +324,8 @@ int send_pack(struct send_pack_args *args,
        int use_sideband = 0;
        int quiet_supported = 0;
        int agent_supported = 0;
+       int use_atomic = 0;
+       int atomic_supported = 0;
        unsigned cmds_sent = 0;
        int ret;
        struct async demux;
@@ -317,6 +346,8 @@ int send_pack(struct send_pack_args *args,
                agent_supported = 1;
        if (server_supports("no-thin"))
                args->use_thin_pack = 0;
+       if (server_supports("atomic"))
+               atomic_supported = 1;
        if (args->push_cert) {
                int len;
 
@@ -331,6 +362,10 @@ int send_pack(struct send_pack_args *args,
                        "Perhaps you should specify a branch such as 'master'.\n");
                return 0;
        }
+       if (args->atomic && !atomic_supported)
+               die(_("server does not support --atomic push"));
+
+       use_atomic = atomic_supported && args->atomic;
 
        if (status_report)
                strbuf_addstr(&cap_buf, " report-status");
@@ -338,6 +373,8 @@ int send_pack(struct send_pack_args *args,
                strbuf_addstr(&cap_buf, " side-band-64k");
        if (quiet_supported && (args->quiet || !args->progress))
                strbuf_addstr(&cap_buf, " quiet");
+       if (use_atomic)
+               strbuf_addstr(&cap_buf, " atomic");
        if (agent_supported)
                strbuf_addf(&cap_buf, " agent=%s", git_user_agent_sanitized());
 
@@ -362,9 +399,21 @@ int send_pack(struct send_pack_args *args,
         * the pack data.
         */
        for (ref = remote_refs; ref; ref = ref->next) {
-               if (!ref_update_to_be_sent(ref, args))
+               switch (check_to_send_update(ref, args)) {
+               case 0: /* no error */
+                       break;
+               case CHECK_REF_STATUS_REJECTED:
+                       /*
+                        * When we know the server would reject a ref update if
+                        * we were to send it and we're trying to send the refs
+                        * atomically, abort the whole operation.
+                        */
+                       if (use_atomic)
+                               return atomic_push_failure(args, remote_refs, ref);
+                       /* Fallthrough for non atomic case. */
+               default:
                        continue;
-
+               }
                if (!ref->deletion)
                        need_pack_data = 1;
 
@@ -383,7 +432,7 @@ int send_pack(struct send_pack_args *args,
                if (args->dry_run || args->push_cert)
                        continue;
 
-               if (!ref_update_to_be_sent(ref, args))
+               if (check_to_send_update(ref, args) < 0)
                        continue;
 
                old_hex = sha1_to_hex(ref->old_sha1);