The wrapper does two things:
- Requests to open /dev/null are redirected to open the nul pseudo file.
- A request to open a file that currently exists as a directory on
  Windows fails with EACCES; this is changed to EISDIR.

Signed-off-by: Johannes Sixt <johannes.sixt@telecom.at>
---
 compat/mingw.c    |   20 ++++++++++++++++++++
 git-compat-util.h |    7 +++++++
 2 files changed, 27 insertions(+), 0 deletions(-)

diff --git a/compat/mingw.c b/compat/mingw.c
index 0c87e43..faa6df3 100644
--- a/compat/mingw.c
+++ b/compat/mingw.c
@@ -2,6 +2,26 @@
 
 unsigned int _CRT_fmode = _O_BINARY;
 
+#undef open
+int mingw_open (const char *filename, int oflags, ...)
+{
+	va_list args;
+	unsigned mode;
+	va_start(args, oflags);
+	mode = va_arg(args, int);
+	va_end(args);
+
+	if (!strcmp(filename, "/dev/null"))
+		filename = "nul";
+	int fd = open(filename, oflags, mode);
+	if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
+		DWORD attrs = GetFileAttributes(filename);
+		if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
+			errno = EISDIR;
+	}
+	return fd;
+}
+
 unsigned int sleep (unsigned int seconds)
 {
 	Sleep(seconds*1000);
diff --git a/git-compat-util.h b/git-compat-util.h
index b1f3f92..672c074 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -577,6 +577,13 @@ struct passwd *getpwuid(int uid);
 int setitimer(int type, struct itimerval *in, struct itimerval *out);
 int sigaction(int sig, struct sigaction *in, struct sigaction *out);
 
+/*
+ * replacements of existing functions
+ */
+
+int mingw_open (const char *filename, int oflags, ...);
+#define open mingw_open
+
 #endif /* __MINGW32__ */
 
 #endif
-- 
1.5.4.1.126.ge5a7d

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