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Make core.sharedRepository work under cygwin 1.7

When core.sharedRepository is used, set_shared_perm() in path.c
needs lstat() to return the correct POSIX permissions.

The default for cygwin is core.ignoreCygwinFSTricks = false, which
means that the fast implementation in do_stat() is used instead of
lstat().

lstat() under cygwin uses the Windows security model to implement
POSIX-like permissions.  The user, group or everyone bits can be set
individually.

do_stat() simplifes the file permission bits, and may return a wrong
value.  The read-only attribute of a file is used to calculate the
permissions, resulting in either rw-r--r-- or r--r--r--

One effect of the simplified do_stat() is that t1301 fails.

Add a function cygwin_get_st_mode_bits() which returns the POSIX
permissions.  When not compiling for cygwin, true_mode_bits() in
path.c is used.

Side note:

t1301 passes under cygwin 1.5.

The "user write" bit is synchronized with the "read only" attribute
of a file:

    $ chmod 444 x
    $ attrib x
    A    R     C:\temp\pt\x

    cygwin 1.7 would show
    A          C:\temp\pt\x

Signed-off-by: Torsten Bögershausen <tboegi@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
  • Loading branch information...
1 parent 7b592fa commit 0117c2f043183fb99e9b046b0df7d64c1b296624 @tboegi tboegi committed with gitster Mar 23, 2013
Showing with 36 additions and 3 deletions.
  1. +13 −0 compat/cygwin.c
  2. +5 −0 compat/cygwin.h
  3. +1 −0 git-compat-util.h
  4. +17 −3 path.c
View
13 compat/cygwin.c
@@ -1,3 +1,4 @@
+#define CYGWIN_C
#define WIN32_LEAN_AND_MEAN
#ifdef CYGWIN_V15_WIN32API
#include "../git-compat-util.h"
@@ -10,6 +11,18 @@
#endif
#include "../cache.h" /* to read configuration */
+/*
+ * Return POSIX permission bits, regardless of core.ignorecygwinfstricks
+ */
+int cygwin_get_st_mode_bits(const char *path, int *mode)
+{
+ struct stat st;
+ if (lstat(path, &st) < 0)
+ return -1;
+ *mode = st.st_mode;
+ return 0;
+}
+
static inline void filetime_to_timespec(const FILETIME *ft, struct timespec *ts)
{
long long winTime = ((long long)ft->dwHighDateTime << 32) +
View
5 compat/cygwin.h
@@ -4,6 +4,11 @@
typedef int (*stat_fn_t)(const char*, struct stat*);
extern stat_fn_t cygwin_stat_fn;
extern stat_fn_t cygwin_lstat_fn;
+int cygwin_get_st_mode_bits(const char *path, int *mode);
+#define get_st_mode_bits(p,m) cygwin_get_st_mode_bits((p),(m))
+#ifndef CYGWIN_C
+/* cygwin.c needs the original lstat() */
#define stat(path, buf) (*cygwin_stat_fn)(path, buf)
#define lstat(path, buf) (*cygwin_lstat_fn)(path, buf)
+#endif
View
1 git-compat-util.h
@@ -163,6 +163,7 @@
typedef long intptr_t;
typedef unsigned long uintptr_t;
#endif
+int get_st_mode_bits(const char *path, int *mode);
#if defined(__CYGWIN__)
#undef _XOPEN_SOURCE
#include <grp.h>
View
20 path.c
@@ -14,6 +14,22 @@
#include "strbuf.h"
#include "string-list.h"
+#ifndef get_st_mode_bits
+/*
+ * The replacement lstat(2) we use on Cygwin is incomplete and
+ * may return wrong permission bits. Most of the time we do not care,
+ * but the callsites of this wrapper do care.
+ */
+int get_st_mode_bits(const char *path, int *mode)
+{
+ struct stat st;
+ if (lstat(path, &st) < 0)
+ return -1;
+ *mode = st.st_mode;
+ return 0;
+}
+#endif
+
static char bad_path[] = "/bad-path/";
static char *get_pathname(void)
@@ -391,7 +407,6 @@ const char *enter_repo(const char *path, int strict)
int set_shared_perm(const char *path, int mode)
{
- struct stat st;
int tweak, shared, orig_mode;
if (!shared_repository) {
@@ -400,9 +415,8 @@ int set_shared_perm(const char *path, int mode)
return 0;
}
if (!mode) {
- if (lstat(path, &st) < 0)
+ if (get_st_mode_bits(path, &mode) < 0)
return -1;
- mode = st.st_mode;
orig_mode = mode;
} else
orig_mode = 0;

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