1 files changed, 72 insertions, 0 deletions
diff --git a/src/nspawn/nspawn-util.c b/src/nspawn/nspawn-util.c
new file mode 100644
index 0000000..830ac39
--- /dev/null
+++ b/src/nspawn/nspawn-util.c
@@ -0,0 +1,72 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "alloc-util.h"
+#include "glob-util.h"
+#include "log.h"
+#include "nspawn-util.h"
+#include "parse-util.h"
+#include "path-util.h"
+#include "string-util.h"
+
+int systemd_installation_has_version(const char *root, const char *minimal_version) {
+        int r;
+
+        /* Try to guess if systemd installation is later than the specified version. This
+         * is hacky and likely to yield false negatives, particularly if the installation
+         * is non-standard. False positives should be relatively rare.
+         */
+
+        FOREACH_STRING(pattern,
+                       /* /lib works for systems without usr-merge, and for systems with a sane
+                        * usr-merge, where /lib is a symlink to /usr/lib. /usr/lib is necessary
+                        * for Gentoo which does a merge without making /lib a symlink.
+                        * Also support multiarch paths von Debian/Ubuntu; *-linux-* is a small
+                        * optimization based on the naming scheme of existing multiarch tuples.
+                        */
+                       "/lib/systemd/libsystemd-shared-*.so",
+                       "/lib64/systemd/libsystemd-shared-*.so",
+                       "/usr/lib/*-linux-*/systemd/libsystemd-shared-*.so",
+                       "/usr/lib/systemd/libsystemd-shared-*.so",
+                       "/usr/lib64/systemd/libsystemd-shared-*.so") {
+
+                _cleanup_strv_free_ char **names = NULL;
+                _cleanup_free_ char *path = NULL;
+                char *c;
+
+                path = path_join(root, pattern);
+                if (!path)
+                        return -ENOMEM;
+
+                r = glob_extend(&names, path, 0);
+                if (r == -ENOENT)
+                        continue;
+                if (r < 0)
+                        return r;
+
+                assert_se(c = endswith(path, "*.so"));
+                *c = '\0'; /* truncate the glob part */
+
+                STRV_FOREACH(name, names) {
+                        /* This is most likely to run only once, hence let's not optimize anything. */
+                        char *t, *t2;
+
+                        t = startswith(basename(*name), "libsystemd-shared-");
+                        if (!t)
+                                continue;
+
+                        t2 = endswith(t, ".so");
+                        if (!t2)
+                                continue;
+                        *t2 = '\0';
+
+                        r = strverscmp_improved(t, minimal_version);
+                        log_debug("Found libsystemd shared at \"%s.so\", version %s (%s).",
+                                  *name, t,
+                                  r >= 0 ? "OK" : "too old");
+                        if (r >= 0)
+                                return true;
+                }
+        }
+
+        return false;
+}