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cutils: Fix get_relocated_path on Windows 

get_relocated_path() did not have error handling for PathCchSkipRoot()
because a path given to get_relocated_path() was expected to be a valid
path containing a drive letter or UNC server/share path elements on
Windows, but sometimes it turned out otherwise.

The paths passed to get_relocated_path() are defined by macros generated
by Meson. Meson in turn uses a prefix given by the configure script to
generate them. For Windows, the script passes /qemu as a prefix to
Meson by default.

As documented in docs/about/build-platforms.rst, typically MSYS2 is used
for the build system, but it is also possible to use Linux as well. When
MSYS2 is used, its Bash variant recognizes /qemu as a MSYS2 path, and
converts it to a Windows path, adding the MSYS2 prefix including a drive
letter or UNC server/share path elements. Such a conversion does not
happen on a shell on Linux however, and /qemu will be passed as is in
the case.

Implement a proper error handling of PathCchSkipRoot() in
get_relocated_path() so that it can handle a path without a drive letter
or UNC server/share path elements.

Reported-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20231005064726.6945-1-akihiko.odaki@daynix.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
master
Akihiko Odaki 2023-10-05 15:47:25 +09:00 committed by Philippe Mathieu-Daudé
parent e257b8ca49
commit dfd3bb0a99
1 changed files with 11 additions and 7 deletions
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18
util/cutils.c
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@ -1163,17 +1163,21 @@ char *get_relocated_path(const char *dir)
g_string_append(result, "/qemu-bundle");
if (access(result->str, R_OK) == 0) {
#ifdef G_OS_WIN32
size_t size = mbsrtowcs(NULL, &dir, 0, &(mbstate_t){0}) + 1;
const char *src = dir;
size_t size = mbsrtowcs(NULL, &src, 0, &(mbstate_t){0}) + 1;
PWSTR wdir = g_new(WCHAR, size);
mbsrtowcs(wdir, &dir, size, &(mbstate_t){0});
mbsrtowcs(wdir, &src, size, &(mbstate_t){0});
PCWSTR wdir_skipped_root;
PathCchSkipRoot(wdir, &wdir_skipped_root);
if (PathCchSkipRoot(wdir, &wdir_skipped_root) == S_OK) {
size = wcsrtombs(NULL, &wdir_skipped_root, 0, &(mbstate_t){0});
char *cursor = result->str + result->len;
g_string_set_size(result, result->len + size);
wcsrtombs(cursor, &wdir_skipped_root, size + 1, &(mbstate_t){0});
} else {
g_string_append(result, dir);
}
size = wcsrtombs(NULL, &wdir_skipped_root, 0, &(mbstate_t){0});
char *cursor = result->str + result->len;
g_string_set_size(result, result->len + size);
wcsrtombs(cursor, &wdir_skipped_root, size + 1, &(mbstate_t){0});
g_free(wdir);
#else
g_string_append(result, dir);