+static char *specifier_user_shell(char specifier, void *data, void *userdata) {
+ Service *s = userdata;
+ int r;
+ const char *username, *shell;
+
+ /* return HOME if set, otherwise from passwd */
+ if (!s->exec_context.user) {
+ char *sh;
+
+ r = get_shell(&sh);
+ if (r < 0)
+ return strdup("/bin/sh");
+
+ return sh;
+ }
+
+ username = s->exec_context.user;
+ r = get_user_creds(&username, NULL, NULL, NULL, &shell);
+ if (r < 0)
+ return strdup("/bin/sh");
+
+ return strdup(shell);
+}
+