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authorJohannes Sixt <j6t@kdbg.org>2008-11-19 17:25:27 +0100
committerJunio C Hamano <gitster@pobox.com>2008-11-23 19:26:42 -0800
commit632f70178784291bd2974e07fdcd2b8e8608f252 (patch)
treef47e781f5332c4cca45dde264a4b700e0b53a2ee /compat/mingw.c
parent3eb91bfc0d2e0c8c67bd4ec62523deb849919dd9 (diff)
downloadgit-632f70178784291bd2974e07fdcd2b8e8608f252.tar.gz
git-632f70178784291bd2974e07fdcd2b8e8608f252.tar.xz
compat/mingw.c: Teach mingw_rename() to replace read-only files
On POSIX, rename() can replace files that are not writable. On Windows, however, read-only files cannot be replaced without additional efforts: We have to make the destination writable first. Since the situations where the destination is read-only are rare, we do not make the destination writable on every invocation, but only if the first try to rename a file failed with an "access denied" error. Signed-off-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'compat/mingw.c')
-rw-r--r--compat/mingw.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/compat/mingw.c b/compat/mingw.c
index 772cad510..45733f9e0 100644
--- a/compat/mingw.c
+++ b/compat/mingw.c
@@ -865,6 +865,8 @@ int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
#undef rename
int mingw_rename(const char *pold, const char *pnew)
{
+ DWORD attrs;
+
/*
* Try native rename() first to get errno right.
* It is based on MoveFile(), which cannot overwrite existing files.
@@ -876,12 +878,19 @@ int mingw_rename(const char *pold, const char *pnew)
if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
return 0;
/* TODO: translate more errors */
- if (GetLastError() == ERROR_ACCESS_DENIED) {
- DWORD attrs = GetFileAttributes(pnew);
- if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY)) {
+ if (GetLastError() == ERROR_ACCESS_DENIED &&
+ (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
+ if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
errno = EISDIR;
return -1;
}
+ if ((attrs & FILE_ATTRIBUTE_READONLY) &&
+ SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
+ if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
+ return 0;
+ /* revert file attributes on failure */
+ SetFileAttributes(pnew, attrs);
+ }
}
errno = EACCES;
return -1;