1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3 #include "alloc-util.h"
4 #include "glob-util.h"
5 #include "log.h"
6 #include "nspawn-util.h"
7 #include "parse-util.h"
8 #include "path-util.h"
9 #include "string-util.h"
10
systemd_installation_has_version(const char * root,const char * minimal_version)11 int systemd_installation_has_version(const char *root, const char *minimal_version) {
12 int r;
13
14 /* Try to guess if systemd installation is later than the specified version. This
15 * is hacky and likely to yield false negatives, particularly if the installation
16 * is non-standard. False positives should be relatively rare.
17 */
18
19 FOREACH_STRING(pattern,
20 /* /lib works for systems without usr-merge, and for systems with a sane
21 * usr-merge, where /lib is a symlink to /usr/lib. /usr/lib is necessary
22 * for Gentoo which does a merge without making /lib a symlink.
23 */
24 "/lib/systemd/libsystemd-shared-*.so",
25 "/lib64/systemd/libsystemd-shared-*.so",
26 "/usr/lib/systemd/libsystemd-shared-*.so",
27 "/usr/lib64/systemd/libsystemd-shared-*.so") {
28
29 _cleanup_strv_free_ char **names = NULL;
30 _cleanup_free_ char *path = NULL;
31 char *c;
32
33 path = path_join(root, pattern);
34 if (!path)
35 return -ENOMEM;
36
37 r = glob_extend(&names, path, 0);
38 if (r == -ENOENT)
39 continue;
40 if (r < 0)
41 return r;
42
43 assert_se(c = endswith(path, "*.so"));
44 *c = '\0'; /* truncate the glob part */
45
46 STRV_FOREACH(name, names) {
47 /* This is most likely to run only once, hence let's not optimize anything. */
48 char *t, *t2;
49
50 t = startswith(*name, path);
51 if (!t)
52 continue;
53
54 t2 = endswith(t, ".so");
55 if (!t2)
56 continue;
57 *t2 = '\0';
58
59 r = strverscmp_improved(t, minimal_version);
60 log_debug("Found libsystemd shared at \"%s.so\", version %s (%s).",
61 *name, t,
62 r >= 0 ? "OK" : "too old");
63 if (r >= 0)
64 return true;
65 }
66 }
67
68 return false;
69 }
70