+static int find_shell(const char *path, const char *root) {
+ int r;
+
+ assert(path);
+
+ if (!valid_shell(path))
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "%s is not a valid shell", path);
+
+ r = chase_symlinks(path, root, CHASE_PREFIX_ROOT, NULL, NULL);
+ if (r < 0) {
+ const char *p;
+ p = prefix_roota(root, path);
+ return log_error_errno(r, "Failed to resolve shell %s: %m", p);
+ }
+
+ return 0;
+}
+