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Merge branch 'jk/upload-pack-keepalive'

When running "fetch -q", a long silence while the sender side
computes the set of objects to send can be mistaken by proxies as
dropped connection.  The server side has been taught to send a small
empty messages to keep the connection alive.

* jk/upload-pack-keepalive:
  upload-pack: bump keepalive default to 5 seconds
  upload-pack: send keepalive packets during pack computation
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2 parents f406140 + 115dedd commit 7b8315bb593c38ac957486916512e9a5df6df087 @gitster gitster committed Sep 20, 2013
Showing with 35 additions and 1 deletion.
  1. +11 −0 Documentation/config.txt
  2. +24 −1 upload-pack.c
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@@ -2288,6 +2288,17 @@ uploadpack.allowtipsha1inwant::
of a hidden ref (by default, such a request is rejected).
see also `uploadpack.hiderefs`.
+uploadpack.keepalive::
+ When `upload-pack` has started `pack-objects`, there may be a
+ quiet period while `pack-objects` prepares the pack. Normally
+ it would output progress information, but if `--quiet` was used
+ for the fetch, `pack-objects` will output nothing at all until
+ the pack data begins. Some clients and networks may consider
+ the server to be hung and give up. Setting this option instructs
+ `upload-pack` to send an empty keepalive packet every
+ `uploadpack.keepalive` seconds. Setting this option to 0
+ disables keepalive packets entirely. The default is 5 seconds.
+
url.<base>.insteadOf::
Any URL that starts with this value will be rewritten to
start, instead, with <base>. In cases where some site serves a
View
@@ -41,6 +41,7 @@ static struct object_array have_obj;
static struct object_array want_obj;
static struct object_array extra_edge_obj;
static unsigned int timeout;
+static int keepalive = 5;
/* 0 for no sideband,
* otherwise maximum packet size (up to 65520 bytes).
*/
@@ -134,6 +135,7 @@ static void create_pack_file(void)
while (1) {
struct pollfd pfd[2];
int pe, pu, pollsize;
+ int ret;
reset_timeout();
@@ -156,7 +158,8 @@ static void create_pack_file(void)
if (!pollsize)
break;
- if (poll(pfd, pollsize, -1) < 0) {
+ ret = poll(pfd, pollsize, 1000 * keepalive);
+ if (ret < 0) {
if (errno != EINTR) {
error("poll failed, resuming: %s",
strerror(errno));
@@ -218,6 +221,21 @@ static void create_pack_file(void)
if (sz < 0)
goto fail;
}
+
+ /*
+ * We hit the keepalive timeout without saying anything; send
+ * an empty message on the data sideband just to let the other
+ * side know we're still working on it, but don't have any data
+ * yet.
+ *
+ * If we don't have a sideband channel, there's no room in the
+ * protocol to say anything, so those clients are just out of
+ * luck.
+ */
+ if (!ret && use_sideband) {
+ static const char buf[] = "0005\1";
+ write_or_die(1, buf, 5);
+ }
}
if (finish_command(&pack_objects)) {
@@ -722,6 +740,11 @@ static int upload_pack_config(const char *var, const char *value, void *unused)
{
if (!strcmp("uploadpack.allowtipsha1inwant", var))
allow_tip_sha1_in_want = git_config_bool(var, value);
+ else if (!strcmp("uploadpack.keepalive", var)) {
+ keepalive = git_config_int(var, value);
+ if (!keepalive)
+ keepalive = -1;
+ }
return parse_hide_refs_config(var, value, "uploadpack");
}

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