Config option to disable side-band-64k for transport

Since commit 0c499ea the send-pack builtin uses the side-band-64k
capability if advertised by the server.

Unfortunately this breaks pushing over the dump git protocol if used
over a network connection.

The detailed reasons for this breakage are (by courtesy of Jeff Preshing,
quoted from ttps://groups.google.com/d/msg/msysgit/at8D7J-h7mw/eaLujILGUWoJ):
----------------------------------------------------------------------------
MinGW wraps Windows sockets in CRT file descriptors in order to mimic the
functionality of POSIX sockets. This causes msvcrt.dll to treat sockets as
Installable File System (IFS) handles, calling ReadFile, WriteFile,
DuplicateHandle and CloseHandle on them. This approach works well in simple
cases on recent versions of Windows, but does not support all usage patterns.
In particular, using this approach, any attempt to read & write concurrently
on the same socket (from one or more processes) will deadlock in a scenario
where the read waits for a response from the server which is only invoked after
the write. This is what send_pack currently attempts to do in the use_sideband
codepath.
----------------------------------------------------------------------------

The new config option "sendpack.sideband" allows to override the side-band-64k
capability of the server, and thus makes the dump git protocol work.

Other transportation methods like ssh and http/https still benefit from
the sideband channel, therefore the default value of "sendpack.sideband"
is still true.

Signed-off-by: Thomas Braun <thomas.braun@byte-physics.de>

Documentation/config.txt

@@ -2459,3 +2459,9 @@ web.browser::
 	Specify a web browser that may be used by some commands.
 	Currently only linkgit:git-instaweb[1] and linkgit:git-help[1]
 	may use it.
+
+sendpack.sideband::
+  Allows to disable the side-band-64k capability for send-pack even
+  when it is advertised by the server. Makes it possible to work
+  around a limitation in the git for windows implementation together
+  with the dump git protocol. Defaults to true.

send-pack.c

@@ -12,6 +12,16 @@
 #include "version.h"
 #include "sha1-array.h"
 
+static int config_use_sideband = 1;
+
+static int send_pack_config(const char *var, const char *value, void *unused)
+{
+	if (!strcmp("sendpack.sideband", var))
+		config_use_sideband = git_config_bool(var, value);
+
+	return 0;
+}
+
 static int feed_object(const unsigned char *sha1, int fd, int negative)
 {
 	char buf[42];
@@ -209,14 +219,16 @@ int send_pack(struct send_pack_args *args,
 	int ret;
 	struct async demux;
 
+	git_config(send_pack_config, NULL);
+
 	/* Does the other end support the reporting? */
 	if (server_supports("report-status"))
 		status_report = 1;
 	if (server_supports("delete-refs"))
 		allow_deleting_refs = 1;
 	if (server_supports("ofs-delta"))
 		args->use_ofs_delta = 1;
-	if (server_supports("side-band-64k"))
+	if (config_use_sideband && server_supports("side-band-64k"))
 		use_sideband = 1;
 	if (server_supports("quiet"))
 		quiet_supported = 1;