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authorZbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>2016-10-02 15:51:27 +0200
committerZbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>2016-10-08 14:48:41 -0400
commit5a46d55fc8f3dc4a86f3994f96369d169c0b96bb (patch)
tree655e36a64c3a5f0f001708e1ad6a8a26206a813b /src
parent16441027352ba442c6664c03af852606035c4a45 (diff)
path-util: add a function to peek into a container and guess systemd version
This is a bit crude and only works for new systemd versions which have libsystemd-shared.
Diffstat (limited to 'src')
-rw-r--r--src/basic/path-util.c68
-rw-r--r--src/basic/path-util.h2
-rw-r--r--src/test/test-path-util.c19
3 files changed, 89 insertions, 0 deletions
diff --git a/src/basic/path-util.c b/src/basic/path-util.c
index b2fa81a294..c32e961af4 100644
--- a/src/basic/path-util.c
+++ b/src/basic/path-util.c
@@ -34,9 +34,11 @@
#include "alloc-util.h"
#include "extract-word.h"
#include "fs-util.h"
+#include "glob-util.h"
#include "log.h"
#include "macro.h"
#include "missing.h"
+#include "parse-util.h"
#include "path-util.h"
#include "stat-util.h"
#include "string-util.h"
@@ -814,3 +816,69 @@ bool is_device_path(const char *path) {
path_startswith(path, "/dev/") ||
path_startswith(path, "/sys/");
}
+
+int systemd_installation_has_version(const char *root, unsigned minimal_version) {
+ const char *pattern;
+ 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.
+ */
+
+ NULSTR_FOREACH(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.
+ */
+ "lib/systemd/libsystemd-shared-*.so\0"
+ "usr/lib/systemd/libsystemd-shared-*.so\0") {
+
+ _cleanup_strv_free_ char **names = NULL;
+ _cleanup_free_ char *path = NULL;
+ char *c, **name;
+
+ path = prefix_root(root, pattern);
+ if (!path)
+ return -ENOMEM;
+
+ r = glob_extend(&names, path);
+ 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;
+ unsigned version;
+
+ t = startswith(*name, path);
+ if (!t)
+ continue;
+
+ t2 = endswith(t, ".so");
+ if (!t2)
+ continue;
+
+ t2[0] = '\0'; /* truncate the suffix */
+
+ r = safe_atou(t, &version);
+ if (r < 0) {
+ log_debug_errno(r, "Found libsystemd shared at \"%s.so\", but failed to parse version: %m", *name);
+ continue;
+ }
+
+ log_debug("Found libsystemd shared at \"%s.so\", version %u (%s).",
+ *name, version,
+ version >= minimal_version ? "OK" : "too old");
+ if (version >= minimal_version)
+ return true;
+ }
+ }
+
+ return false;
+}
diff --git a/src/basic/path-util.h b/src/basic/path-util.h
index a27c13fcc3..78472f0961 100644
--- a/src/basic/path-util.h
+++ b/src/basic/path-util.h
@@ -125,3 +125,5 @@ char *file_in_same_dir(const char *path, const char *filename);
bool hidden_or_backup_file(const char *filename) _pure_;
bool is_device_path(const char *path);
+
+int systemd_installation_has_version(const char *root, unsigned minimal_version);
diff --git a/src/test/test-path-util.c b/src/test/test-path-util.c
index 164a10d8a8..0b10d8e25e 100644
--- a/src/test/test-path-util.c
+++ b/src/test/test-path-util.c
@@ -511,7 +511,24 @@ static void test_hidden_or_backup_file(void) {
assert_se(!hidden_or_backup_file("test.dpkg-old.foo"));
}
+static void test_systemd_installation_has_version(const char *path) {
+ int r;
+ const unsigned versions[] = {0, 231, atoi(PACKAGE_VERSION), 999};
+ unsigned i;
+
+ for (i = 0; i < ELEMENTSOF(versions); i++) {
+ r = systemd_installation_has_version(path, versions[i]);
+ assert_se(r >= 0);
+ log_info("%s has systemd >= %u: %s",
+ path ?: "Current installation", versions[i], yes_no(r));
+ }
+}
+
int main(int argc, char **argv) {
+ log_set_max_level(LOG_DEBUG);
+ log_parse_environment();
+ log_open();
+
test_path();
test_find_binary(argv[0]);
test_prefixes();
@@ -526,5 +543,7 @@ int main(int argc, char **argv) {
test_filename_is_valid();
test_hidden_or_backup_file();
+ test_systemd_installation_has_version(argv[1]); /* NULL is OK */
+
return 0;
}