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mingw: do resolve symlinks in `getcwd()` 

As pointed out in https://github.com/git-for-windows/git/issues/1676,
the `git rev-parse --is-inside-work-tree` command currently fails when
the current directory's path contains symbolic links.

The underlying reason for this bug is that `getcwd()` is supposed to
resolve symbolic links, but our `mingw_getcwd()` implementation did not.

We do have all the building blocks for that, though: the
`GetFinalPathByHandleW()` function will resolve symbolic links. However,
we only called that function if `GetLongPathNameW()` failed, for
historical reasons: the latter function was supported for a long time,
but the former API function was introduced only with Windows Vista, and
we used to support also Windows XP. With that support having been
dropped, we are free to call the symbolic link-resolving function right
away.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
maint
Johannes Schindelin 2026-01-09 20:05:05 +00:00 committed by Junio C Hamano
parent 3d86511c12
commit f0af8b4aae
1 changed files with 7 additions and 11 deletions
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18
compat/mingw.c
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@ -1239,18 +1239,16 @@ char *mingw_getcwd(char *pointer, int len)
{
wchar_t cwd[MAX_PATH], wpointer[MAX_PATH];
DWORD ret = GetCurrentDirectoryW(ARRAY_SIZE(cwd), cwd);
HANDLE hnd;

if (!ret || ret >= ARRAY_SIZE(cwd)) {
errno = ret ? ENAMETOOLONG : err_win_to_posix(GetLastError());
return NULL;
}
ret = GetLongPathNameW(cwd, wpointer, ARRAY_SIZE(wpointer));
if (!ret && GetLastError() == ERROR_ACCESS_DENIED) {
HANDLE hnd = CreateFileW(cwd, 0,
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, NULL,
OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
if (hnd == INVALID_HANDLE_VALUE)
return NULL;
hnd = CreateFileW(cwd, 0,
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, NULL,
OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
if (hnd != INVALID_HANDLE_VALUE) {
ret = GetFinalPathNameByHandleW(hnd, wpointer, ARRAY_SIZE(wpointer), 0);
CloseHandle(hnd);
if (!ret || ret >= ARRAY_SIZE(wpointer))
@ -1259,13 +1257,11 @@ char *mingw_getcwd(char *pointer, int len)
return NULL;
return pointer;
}
if (!ret || ret >= ARRAY_SIZE(wpointer))
return NULL;
if (GetFileAttributesW(wpointer) == INVALID_FILE_ATTRIBUTES) {
if (GetFileAttributesW(cwd) == INVALID_FILE_ATTRIBUTES) {
errno = ENOENT;
return NULL;
}
if (xwcstoutf(pointer, wpointer, len) < 0)
if (xwcstoutf(pointer, cwd, len) < 0)
return NULL;
convert_slashes(pointer);
return pointer;