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util-lib: beef path_is_os_tree() up a bit

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Let's use chase_symlinks() when looking for /etc/os-release and
/usr/lib/os-release as these files might be symlinks (and actually are IRL on
some distros).
This commit is contained in:
Lennart Poettering
2016-12-20 20:00:08 +01:00
parent 245f1d244b
commit 7dcdb24e19
2 changed files with 24 additions and 9 deletions
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src/basic/stat-util.c
+17 -9
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@@ -28,6 +28,7 @@
#include "dirent-util.h"
#include "fd-util.h"
#include "fs-util.h"
#include "macro.h"
#include "missing.h"
#include "stat-util.h"
@@ -143,22 +144,29 @@ int path_is_read_only_fs(const char *path) {
}
int path_is_os_tree(const char *path) {
char *p;
int r;
assert(path);
/* Does the path exist at all? If not, generate an error immediately. This is useful so that a missing root dir
* always results in -ENOENT, and we can properly distuingish the case where the whole root doesn't exist from
* the case where just the os-release file is missing. */
if (laccess(path, F_OK) < 0)
return -errno;
/* We use /usr/lib/os-release as flag file if something is an OS */
p = strjoina(path, "/usr/lib/os-release");
r = access(p, F_OK);
if (r >= 0)
return 1;
r = chase_symlinks("/usr/lib/os-release", path, CHASE_PREFIX_ROOT, NULL);
if (r == -ENOENT) {
/* Also check for the old location in /etc, just in case. */
p = strjoina(path, "/etc/os-release");
r = access(p, F_OK);
/* Also check for the old location in /etc, just in case. */
r = chase_symlinks("/etc/os-release", path, CHASE_PREFIX_ROOT, NULL);
if (r == -ENOENT)
return 0; /* We got nothing */
}
if (r < 0)
return r;
return r >= 0;
return 1;
}
int files_same(const char *filea, const char *fileb) {