t6500(mingw): use the Windows PID of the shell

In Git for Windows, we use the MSYS2 Bash which inherits a non-standard
PID model from Cygwin's POSIX emulation layer: every MSYS2 process has a
regular Windows PID, and in addition it has an MSYS2 PID (which
corresponds to a shadow process that emulates Unix-style signal
handling).

With the upgrade to the MSYS2 runtime v3.x, this shadow process cannot
be accessed via `OpenProcess()` any longer, and therefore t6500 thought
incorrectly that the process referenced in `gc.pid` (which is not
actually a real `gc` process in this context, but the current shell) no
longer exists.

Let's fix this by making sure that the Windows PID is written into
`gc.pid` in this test script so that `git.exe` is able to understand
that that process does indeed still exist.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/t6500-gc.sh b/t/t6500-gc.sh
index 4684d06552ac2eeafff19cfd696fd36d20cef5d4..53258d45a1255305e05307451cc5272c95f85d6a 100755 (executable)
--- a/t/t6500-gc.sh
+++ b/t/t6500-gc.sh
@@ -162,7 +162,15 @@ test_expect_success 'background auto gc respects lock for all operations' '
        # now fake a concurrent gc that holds the lock; we can use our
        # shell pid so that it looks valid.
        hostname=$(hostname || echo unknown) &&
-       printf "$$ %s" "$hostname" >.git/gc.pid &&
+       shell_pid=$$ &&
+       if test_have_prereq MINGW && test -f /proc/$shell_pid/winpid
+       then
+               # In Git for Windows, Bash (actually, the MSYS2 runtime) has a
+               # different idea of PIDs than git.exe (actually Windows). Use
+               # the Windows PID in this case.
+               shell_pid=$(cat /proc/$shell_pid/winpid)
+       fi &&
+       printf "%d %s" "$shell_pid" "$hostname" >.git/gc.pid &&
 
        # our gc should exit zero without doing anything
        run_and_wait_for_auto_gc &&