From: Ronnie Sahlberg <sahlb...@google.com>
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>
Signed-off-by: Stefan Beller <sbel...@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 6d5424c..763120c 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 397abc9..63acebf 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());
--
2.2.0.rc2.5.gf7b9fb2
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