This adds support to the protocol between send-pack and receive-pack to
* allow receive-pack to inform the client that it has atomic push capability
* allow send-pack to request atomic push back.

There is currently no setting in send-pack to actually request that atomic
pushes are to be used yet. This only adds protocol capability not ability
for the user to activate it.

Signed-off-by: Ronnie Sahlberg <sahlb...@google.com>
---
 Documentation/technical/protocol-capabilities.txt | 12 ++++++++++--
 builtin/receive-pack.c                            |  6 +++++-
 send-pack.c                                       |  6 ++++++
 3 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/Documentation/technical/protocol-capabilities.txt 
b/Documentation/technical/protocol-capabilities.txt
index 0c92dee..26bc5b1 100644
--- a/Documentation/technical/protocol-capabilities.txt
+++ b/Documentation/technical/protocol-capabilities.txt
@@ -18,8 +18,9 @@ was sent.  Server MUST NOT ignore capabilities that client 
requested
 and server advertised.  As a consequence of these rules, server MUST
 NOT advertise capabilities it does not understand.
 
-The 'report-status', 'delete-refs', 'quiet', and 'push-cert' capabilities
-are sent and recognized by the receive-pack (push to server) process.
+The 'atomic-push', 'report-status', 'delete-refs', 'quiet', and 'push-cert'
+capabilities are sent and recognized by the receive-pack (push to server)
+process.
 
 The 'ofs-delta' and 'side-band-64k' capabilities are sent and recognized
 by both upload-pack and receive-pack protocols.  The 'agent' capability
@@ -244,6 +245,13 @@ respond with the 'quiet' capability to suppress 
server-side progress
 reporting if the local progress reporting is also being suppressed
 (e.g., via `push -q`, or if stderr does not go to a tty).
 
+atomic-push
+-----------
+
+If the server sends the 'atomic-push' capability, it means it is
+capable of accepting atomic pushes. If the pushing client requests this
+capability, the server will update the refs in one single atomic transaction.
+
 allow-tip-sha1-in-want
 ----------------------
 
diff --git a/builtin/receive-pack.c b/builtin/receive-pack.c
index ccea9dc..65d9a7e 100644
--- a/builtin/receive-pack.c
+++ b/builtin/receive-pack.c
@@ -40,6 +40,7 @@ static int transfer_unpack_limit = -1;
 static int unpack_limit = 100;
 static int report_status;
 static int use_sideband;
+static int use_atomic_push;
 static int quiet;
 static int prefer_ofs_delta = 1;
 static int auto_update_server_info;
@@ -171,7 +172,8 @@ static void show_ref(const char *path, const unsigned char 
*sha1)
                struct strbuf cap = STRBUF_INIT;
 
                strbuf_addstr(&cap,
-                             "report-status delete-refs side-band-64k quiet");
+                             "report-status delete-refs side-band-64k quiet "
+                             "atomic-push");
                if (prefer_ofs_delta)
                        strbuf_addstr(&cap, " ofs-delta");
                if (push_cert_nonce)
@@ -1178,6 +1180,8 @@ static struct command *read_head_info(struct sha1_array 
*shallow)
                                use_sideband = LARGE_PACKET_MAX;
                        if (parse_feature_request(feature_list, "quiet"))
                                quiet = 1;
+                       if (parse_feature_request(feature_list, "atomic-push"))
+                               use_atomic_push = 1;
                }
 
                if (!strcmp(line, "push-cert")) {
diff --git a/send-pack.c b/send-pack.c
index 949cb61..1ccc84c 100644
--- a/send-pack.c
+++ b/send-pack.c
@@ -294,6 +294,8 @@ int send_pack(struct send_pack_args *args,
        int use_sideband = 0;
        int quiet_supported = 0;
        int agent_supported = 0;
+       int atomic_push_supported = 0;
+       int atomic_push = 0;
        unsigned cmds_sent = 0;
        int ret;
        struct async demux;
@@ -314,6 +316,8 @@ 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-push"))
+               atomic_push_supported = 1;
        if (args->push_cert) {
                int len;
 
@@ -335,6 +339,8 @@ 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 (atomic_push)
+               strbuf_addstr(&cap_buf, " atomic-push");
        if (agent_supported)
                strbuf_addf(&cap_buf, " agent=%s", git_user_agent_sanitized());
 
-- 
2.1.0.rc2.206.gedb03e5

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