From 632f70178784291bd2974e07fdcd2b8e8608f252 Mon Sep 17 00:00:00 2001 From: Johannes Sixt Date: Wed, 19 Nov 2008 17:25:27 +0100 Subject: [PATCH] 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 Signed-off-by: Junio C Hamano --- compat/mingw.c | 15 ++++++++++++--- 1 file 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; -- 2.26.2