mingw: fix launching of externals from Unicode paths

If Git were installed in a path containing non-ASCII characters,
commands such as `git am` and `git submodule`, which are implemented as
externals, would fail to launch with the following error:

> fatal: 'am' appears to be a git command, but we were not
> able to execute it. Maybe git-am is broken?

This was due to lookup_prog not being Unicode-aware. It was somehow
missed in 85faec9d3a (Win32: Unicode file name support (except dirent),
2012-03-15).

Note that the only problem in this function was calling
`GetFileAttributes()` instead of `GetFileAttributesW()`. The calls to
`access()` were fine because `access()` is a macro which resolves to
`mingw_access()`, which already handles Unicode correctly. But
`lookup_prog()` was changed to use `_waccess()` directly so that we only
convert the path to UTF-16 once.

To make things work correctly, we have to maintain UTF-8 and UTF-16
versions in tandem in `lookup_prog()`.

Signed-off-by: Adam Roben <adam@roben.org>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/compat/mingw.c b/compat/mingw.c
index 738f0a826a51b850fcc93f0cadbf707c7eb0b492..a417a3b1ae09397ec702f8b56d13655c2c75a6d3 100644 (file)
--- a/compat/mingw.c
+++ b/compat/mingw.c
@@ -1161,14 +1161,21 @@ static char *lookup_prog(const char *dir, int dirlen, const char *cmd,
                         int isexe, int exe_only)
 {
        char path[MAX_PATH];
+       wchar_t wpath[MAX_PATH];
        snprintf(path, sizeof(path), "%.*s\\%s.exe", dirlen, dir, cmd);
 
-       if (!isexe && access(path, F_OK) == 0)
+       if (xutftowcs_path(wpath, path) < 0)
+               return NULL;
+
+       if (!isexe && _waccess(wpath, F_OK) == 0)
                return xstrdup(path);
-       path[strlen(path)-4] = '\0';
-       if ((!exe_only || isexe) && access(path, F_OK) == 0)
-               if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
+       wpath[wcslen(wpath)-4] = '\0';
+       if ((!exe_only || isexe) && _waccess(wpath, F_OK) == 0) {
+               if (!(GetFileAttributesW(wpath) & FILE_ATTRIBUTE_DIRECTORY)) {
+                       path[strlen(path)-4] = '\0';
                        return xstrdup(path);
+               }
+       }
        return NULL;
 }