mingw.c: ignore EACCES from mkdir if directory exists

Microsoft Windows has a strange issue with access permissions such that
mkdir will sometimes return EACESS for an existing directory.  This is
mentioned here:

   http://www.apijunkie.com/APIJunkie/blog/post/2009/12/22/_mkdir-C-runtime-library-function-might-return-unexpected-error-values.aspx

This was causing mkdir -p to fail on a particular machine.  Ignoring the
EACCES error if the directory exists fixes the problem.

1 files changed, 14 insertions, 1 deletions

diff --git a/win32/mingw.c b/win32/mingw.c
index 8045fb996..dfdbecc85 100644
--- a/win32/mingw.c
+++ b/win32/mingw.c
@@ -762,7 +762,20 @@ const char *get_busybox_exec_path(void)
 #undef mkdir
 int mingw_mkdir(const char *path, int mode UNUSED_PARAM)
 {
-        return mkdir(path);
+        int ret;
+        struct stat st;
+        int lerrno = 0;
+
+        if ( (ret=mkdir(path)) < 0 ) {
+                lerrno = errno;
+                if ( lerrno == EACCES && stat(path, &st) == 0 ) {
+                        ret = 0;
+                        lerrno = 0;
+                }
+        }
+
+        errno = lerrno;
+        return ret;
 }
 
 int fcntl(int fd, int cmd, ...)