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mingw: improve performance of mingw_unlink() 

Update mingw_unlink() to first try to delete the file with existing
permissions before trying to force it.

Windows throws an error when trying to delete a read-only file.  The
mingw_unlink() compatibility wrapper always tries to _wchmod(666) the
file before calling _wunlink() to avoid that error.  However, since
most files in the worktree are already writable, this is usually
wasted effort.

Update mingw_unlink() to just call DeleteFileW() directly and if that
succeeds return.  If that fails, fall back into the existing code path
to update the permissions and use _wunlink() to get the existing
error code mapping.

Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff Hostetler 2020-08-17 10:37:02 +00:00 committed by Junio C Hamano
parent 47ae905ffb
commit 680e0b4524
1 changed files with 3 additions and 0 deletions
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3
compat/mingw.c
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@ -290,6 +290,9 @@ int mingw_unlink(const char *pathname)
if (xutftowcs_path(wpathname, pathname) < 0)
return -1;
if (DeleteFileW(wpathname))
return 0;
/* read-only files cannot be removed */
_wchmod(wpathname, 0666);
while ((ret = _wunlink(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {