The pre/post receive hook may be interested in more information from the
user. This information can be transmitted when both client and server
support the "push-options" capability, which when used is a phase directly
after update commands ended by a flush pkt.
Similar to the atomic option, the server capability can be disabled via
the `receive.advertisePushOptions` config variable. While documenting
this, fix a nit in the `receive.advertiseAtomic` wording.
Signed-off-by: Stefan Beller <sbeller@xxxxxxxxxx>
---
Documentation/config.txt | 9 ++-
Documentation/technical/pack-protocol.txt | 10 ++--
Documentation/technical/protocol-capabilities.txt | 9 +++
builtin/receive-pack.c | 69 +++++++++++++++++++++++
4 files changed, 91 insertions(+), 6 deletions(-)
diff --git a/Documentation/config.txt b/Documentation/config.txt
index e208af1..25b5db1 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -2410,8 +2410,13 @@ rebase.instructionFormat
receive.advertiseAtomic::
By default, git-receive-pack will advertise the atomic push
- capability to its clients. If you don't want to this capability
- to be advertised, set this variable to false.
+ capability to its clients. If you don't want to advertise this
+ capability, set this variable to false.
+
+receive.advertisePushOptions::
+ By default, git-receive-pack will advertise the push options
+ capability to its clients. If you don't want to advertise this
+ capability, set this variable to false.
receive.autogc::
By default, git-receive-pack will run "git-gc --auto" after
diff --git a/Documentation/technical/pack-protocol.txt b/Documentation/technical/pack-protocol.txt
index 8b36343..7a2ed30 100644
--- a/Documentation/technical/pack-protocol.txt
+++ b/Documentation/technical/pack-protocol.txt
@@ -454,7 +454,8 @@ The reference discovery phase is done nearly the same way as it is in the
fetching protocol. Each reference obj-id and name on the server is sent
in packet-line format to the client, followed by a flush-pkt. The only
real difference is that the capability listing is different - the only
-possible values are 'report-status', 'delete-refs' and 'ofs-delta'.
+possible values are 'report-status', 'delete-refs', 'ofs-delta' and
+'push-options'.
Reference Update Request and Packfile Transfer
----------------------------------------------
@@ -465,9 +466,10 @@ that it wants to update, it sends a line listing the obj-id currently on
the server, the obj-id the client would like to update it to and the name
of the reference.
-This list is followed by a flush-pkt and then the packfile that should
-contain all the objects that the server will need to complete the new
-references.
+This list is followed by a flush-pkt. Then the push options are transmitted
+one per packet followed by another flush-pkt. After that the packfile that
+should contain all the objects that the server will need to complete the new
+references will be sent.
----
update-request = *shallow ( command-list | push-cert ) [packfile]
diff --git a/Documentation/technical/protocol-capabilities.txt b/Documentation/technical/protocol-capabilities.txt
index eaab6b4..4c28d3a 100644
--- a/Documentation/technical/protocol-capabilities.txt
+++ b/Documentation/technical/protocol-capabilities.txt
@@ -253,6 +253,15 @@ 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.
+push-options
+------------
+
+If the server sends the 'push-options' capability it is able to accept
+push options after the update commands have been sent, but before the
+packfile is streamed. If the pushing client requests this capability,
+the server will pass the options to the pre- and post- receive hooks
+that process this push request.
+
allow-tip-sha1-in-want
----------------------
diff --git a/builtin/receive-pack.c b/builtin/receive-pack.c
index 236417e..754db6e 100644
--- a/builtin/receive-pack.c
+++ b/builtin/receive-pack.c
@@ -44,10 +44,12 @@ static struct strbuf fsck_msg_types = STRBUF_INIT;
static int receive_unpack_limit = -1;
static int transfer_unpack_limit = -1;
static int advertise_atomic_push = 1;
+static int advertise_push_options = 1;
static int unpack_limit = 100;
static int report_status;
static int use_sideband;
static int use_atomic;
+static int use_push_options;
static int quiet;
static int prefer_ofs_delta = 1;
static int auto_update_server_info;
@@ -193,6 +195,11 @@ static int receive_pack_config(const char *var, const char *value, void *cb)
return 0;
}
+ if (strcmp(var, "receive.advertisepushoptions") == 0) {
+ advertise_push_options = git_config_bool(var, value);
+ return 0;
+ }
+
return git_default_config(var, value, cb);
}
@@ -211,6 +218,8 @@ static void show_ref(const char *path, const unsigned char *sha1)
strbuf_addstr(&cap, " ofs-delta");
if (push_cert_nonce)
strbuf_addf(&cap, " push-cert=%s", push_cert_nonce);
+ if (advertise_push_options)
+ strbuf_addstr(&cap, " push-options");
strbuf_addf(&cap, " agent=%s", git_user_agent_sanitized());
packet_write(1, "%s %s%c%s\n",
sha1_to_hex(sha1), path, 0, cap.buf);
@@ -1455,6 +1464,9 @@ static struct command *read_head_info(struct sha1_array *shallow)
if (advertise_atomic_push
&& parse_feature_request(feature_list, "atomic"))
use_atomic = 1;
+ if (advertise_push_options
+ && parse_feature_request(feature_list, "push-options"))
+ use_push_options = 1;
}
if (!strcmp(line, "push-cert")) {
@@ -1487,6 +1499,60 @@ static struct command *read_head_info(struct sha1_array *shallow)
return commands;
}
+static struct string_list *read_push_options(void)
+{
+ int i;
+ struct string_list *ret = xmalloc(sizeof(*ret));
+ string_list_init(ret, 1);
+
+ /* NEEDSWORK: expose the limitations to be configurable. */
+ int max_options = 32;
+
+ /*
+ * NEEDSWORK: expose the limitations to be configurable;
+ * Once the limit can be lifted, include a way for payloads
+ * larger than one pkt, e.g allow a payload of up to
+ * LARGE_PACKET_MAX - 1 only, and reserve the last byte
+ * to indicate whether the next pkt continues with this
+ * push option.
+ */
+ int max_size = 1024;
+
+ for (i = 0; i < max_options; i++) {
+ char *line;
+ int len;
+
+ line = packet_read_line(0, &len);
+
+ if (!line)
+ break;
+
+ if (len > max_size) {
+ /*
+ * NEEDSWORK: The error message in die(..) is not
+ * transmitted in call cases, so ideally all die(..)
+ * calls are prefixed with rp_error and then we can
+ * combine rp_error && die into one helper function.
+ */
+ rp_error("protocol error: server configuration allows push "
+ "options of size up to %d bytes", max_size);
+ die("protocol error: push options too large");
+ }
+
+ len = strcspn(line, "\n");
+ line[len] = '\0';
+
+ string_list_append(ret, line);
+ }
+ if (i == max_options) {
+ rp_error("protocol error: server configuration only allows up "
+ "to %d push options", max_options);
+ die("protocol error: push options too large");
+ }
+
+ return ret;
+}
+
static const char *parse_pack_header(struct pack_header *hdr)
{
switch (read_pack_header(0, hdr)) {
@@ -1774,6 +1840,9 @@ int cmd_receive_pack(int argc, const char **argv, const char *prefix)
const char *unpack_status = NULL;
struct string_list *push_options = NULL;
+ if (use_push_options)
+ push_options = read_push_options();
+
prepare_shallow_info(&si, &shallow);
if (!si.nr_ours && !si.nr_theirs)
shallow_update = 0;
--
2.9.0.247.g176c4f7
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