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sub-process: refactor handshake to common function

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Refactor, into a common function, the version and capability negotiation
done when invoking a long-running process as a clean or smudge filter.
This will be useful for other Git code that needs to interact similarly
with a long-running process.

As you can see in the change to t0021, this commit changes the error
message reported when the long-running process does not introduce itself
with the expected "server"-terminated line. Originally, the error
message reports that the filter "does not support filter protocol
version 2", differentiating between the old single-file filter protocol
and the new multi-file filter protocol - I have updated it to something
more generic and useful.

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jonathan Tan
2017-07-26 11:17:29 -07:00
committed by Junio C Hamano
parent 7e2e1bbb24
commit fa64a2fdbe
6 changed files with 138 additions and 90 deletions
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19
pkt-line.c
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@ -171,25 +171,6 @@ int packet_write_fmt_gently(int fd, const char *fmt, ...)
return status;
}
int packet_writel(int fd, const char *line, ...)
{
va_list args;
int err;
va_start(args, line);
for (;;) {
if (!line)
break;
if (strlen(line) > LARGE_PACKET_DATA_MAX)
return -1;
err = packet_write_fmt_gently(fd, "%s\n", line);
if (err)
return err;
line = va_arg(args, const char*);
}
va_end(args);
return packet_flush_gently(fd);
}
static int packet_write_gently(const int fd_out, const char *buf, size_t size)
{
static char packet_write_buffer[LARGE_PACKET_MAX];