path-util: unify code for detecting OS trees

[elogind.git] / src / shared / path-util.c

diff --git a/src/shared/path-util.c b/src/shared/path-util.c
index 52ce65de6d9a8b8e65f6a533ab896c317129c628..b623fc3dd5adeb9cad7034ee05425b73dd29ab7b 100644 (file)
--- a/src/shared/path-util.c
+++ b/src/shared/path-util.c
@@ -215,6 +215,16 @@ char **path_strv_canonicalize(char **l) {
         return l;
 }
 
+char **path_strv_canonicalize_uniq(char **l) {
+        if (strv_isempty(l))
+                return l;
+
+        if (!path_strv_canonicalize(l))
+                return NULL;
+
+        return strv_uniq(l);
+}
+
 char *path_kill_slashes(char *path) {
         char *f, *t;
         bool slash = false;
@@ -403,3 +413,15 @@ int path_is_read_only_fs(const char *path) {
 
         return !!(st.f_flag & ST_RDONLY);
 }
+
+int path_is_os_tree(const char *path) {
+        char *p;
+        int r;
+
+        /* We use /etc/os-release as flag file if something is an OS */
+
+        p = strappenda(path, "/etc/os-release");
+        r = access(p, F_OK);
+
+        return r < 0 ? 0 : 1;
+}