Re: [PATCH] t1410: fix breakage on case-insensitive filesystems

Johannes Sixt [off-list ref] writes:

O_WRONLY and O_RDWR aren't flags, but two values of a 2-bit field
(O_ACCMODE).

Andreas.

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Am 14.11.2014 um 22:04 schrieb Andreas Schwab:

Johannes Sixt [off-list ref] writes:

quoted

diff --git a/compat/mingw.c b/compat/mingw.c
index 2ee3fe3..fc64b73 100644
--- a/compat/mingw.c
+++ b/compat/mingw.c

@@ -312,7 +312,7 @@ int mingw_open (const char *filename, int oflags, ...)
 		return -1;
 	fd = _wopen(wfilename, oflags, mode);
 
-	if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
+	if (fd < 0 && (oflags & (O_WRONLY|O_RDWR)) && errno == EACCES) {

O_WRONLY and O_RDWR aren't flags, but two values of a 2-bit field
(O_ACCMODE).

Hrm... I wondered why O_RDONLY can be zero. If I find O_ACCMODE on
Windows, I'll use it, otherwise, the patch as is will have to do - we
don't have to be particularly portable in this corner of the code.

-- Hannes

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According to the Linux open(2) man page, open() returns EISDIR if a
directory was attempted to be opened for writing. Our emulation in
mingw_open() does not get this right: it checks only for O_CREAT. Fix
it to check for a write request.

This fixes a failure in reflog handling, which opens files with
O_APPEND|O_WRONLY, but without O_CREAT, and expects EISDIR when the
named file happens to be a directory.

Signed-off-by: Johannes Sixt <redacted>
---
 This version of the patch uses O_ACCMODE.

 compat/mingw.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/compat/mingw.c b/compat/mingw.c
index 2ee3fe3..c702731 100644
--- a/compat/mingw.c
+++ b/compat/mingw.c

@@ -312,7 +312,7 @@ int mingw_open (const char *filename, int oflags, ...)
 		return -1;
 	fd = _wopen(wfilename, oflags, mode);
 
-	if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
+	if (fd < 0 && (oflags & O_ACCMODE) != O_RDONLY && errno == EACCES) {
 		DWORD attrs = GetFileAttributesW(wfilename);
 		if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 			errno = EISDIR;

-- 
2.0.0.12.gbcf935e

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