Stefan Beller <sbeller@xxxxxxxxxx> writes:
> From: Ronnie Sahlberg <sahlberg@xxxxxxxxxx>
>
> This adds the atomic protocol option to allow
> receive-pack to inform the client that it has
> atomic push capability.
>
> This commit makes the functionality introduced
> in the previous commits go live for the serving
> side. The changes in documentation reflect the
> protocol capabilities of the server.
>
> Signed-off-by: Stefan Beller <sbeller@xxxxxxxxxx>
> ---
>
> Notes:
> v10, v11, v12:
> * no changes
>
> v9:
> This was once part of "[PATCH 1/7] receive-pack.c:
> add protocol support to negotiate atomic-push"
> but now it only touches the receive-pack.c part
> and doesn't bother with the send-pack part any more.
> That is done in a later patch, when send-pack actually
> learns all the things it needs to know about the
> atomic push option.
>
> We can configure the remote if it wants to advertise
> atomicity!
>
> All previous notes were lost due to my glorious
> capability to operate git rebase.
The list archive remembers if you really care ;-)
I ran out of time and concentration for today to read it through at
this step; among things I saw, nothing looked wrong so far, and at
this step everything looks ready to be tested almost.
Looking good.
>
> Documentation/technical/protocol-capabilities.txt | 13 +++++++++++--
> builtin/receive-pack.c | 11 +++++++++++
> 2 files changed, 22 insertions(+), 2 deletions(-)
>
> diff --git a/Documentation/technical/protocol-capabilities.txt b/Documentation/technical/protocol-capabilities.txt
> index 6d5424c..4f8a7bf 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', '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 +245,14 @@ 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
> +------
> +
> +If the server sends the 'atomic' capability it is capable of accepting
> +atomic pushes. If the pushing client requests this capability, the server
> +will update the refs in one atomic transaction. Either all refs are
> +updated or none.
> +
> allow-tip-sha1-in-want
> ----------------------
>
> diff --git a/builtin/receive-pack.c b/builtin/receive-pack.c
> index 362d33f..4c069c5 100644
> --- a/builtin/receive-pack.c
> +++ b/builtin/receive-pack.c
> @@ -37,6 +37,7 @@ static int receive_fsck_objects = -1;
> static int transfer_fsck_objects = -1;
> static int receive_unpack_limit = -1;
> static int transfer_unpack_limit = -1;
> +static int advertise_atomic_push = 1;
> static int unpack_limit = 100;
> static int report_status;
> static int use_sideband;
> @@ -159,6 +160,11 @@ static int receive_pack_config(const char *var, const char *value, void *cb)
> return 0;
> }
>
> + if (strcmp(var, "receive.advertiseatomic") == 0) {
> + advertise_atomic_push = git_config_bool(var, value);
> + return 0;
> + }
> +
> return git_default_config(var, value, cb);
> }
>
> @@ -174,6 +180,8 @@ static void show_ref(const char *path, const unsigned char *sha1)
>
> strbuf_addstr(&cap,
> "report-status delete-refs side-band-64k quiet");
> + if (advertise_atomic_push)
> + strbuf_addstr(&cap, " atomic");
> if (prefer_ofs_delta)
> strbuf_addstr(&cap, " ofs-delta");
> if (push_cert_nonce)
> @@ -1263,6 +1271,9 @@ 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 (advertise_atomic_push
> + && parse_feature_request(feature_list, "atomic"))
> + use_atomic = 1;
> }
>
> if (!strcmp(line, "push-cert")) {
--
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