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simple-ipc: work around issues with Cygwin's Unix socket emulation

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Cygwin emulates Unix sockets by writing files with custom contents and
then marking them as system files.

The tricky problem is that while the file is written and its `system`
bit is set, it is still identified as a file. This caused test failures
when Git is too fast looking for the Unix sockets and then complains
that there is a plain file in the way.

Let's work around this by adding a delayed retry loop, specifically for
Cygwin.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Tested-by: Ramsay Jones <ramsay@ramsayjones.plus.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Johannes Schindelin 2021-11-10 11:09:10 +00:00 committed by Junio C Hamano
parent 6c220937e2
commit 974ef7ced2
1 changed files with 22 additions and 0 deletions
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22
compat/simple-ipc/ipc-unix-socket.c
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@ -35,6 +35,28 @@ enum ipc_active_state ipc_get_active_state(const char *path)
}
}
#ifdef __CYGWIN__
/*
* Cygwin emulates Unix sockets by writing special-crafted files whose
* `system` bit is set.
*
* If we are too fast, Cygwin might still be in the process of marking
* the underlying file as a system file. Until then, we will not see a
* Unix socket here, but a plain file instead. Just in case that this
* is happening, wait a little and try again.
*/
{
static const int delay[] = { 1, 10, 20, 40, -1 };
int i;
for (i = 0; S_ISREG(st.st_mode) && delay[i] > 0; i++) {
sleep_millisec(delay[i]);
if (lstat(path, &st) == -1)
return IPC_STATE__INVALID_PATH;
}
}
#endif
/* also complain if a plain file is in the way */
if ((st.st_mode & S_IFMT) != S_IFSOCK)
return IPC_STATE__INVALID_PATH;