sysusers: allow the shell to be specified

This is necessary for some system users where the "login shell" is
set to a specific binary.

1 files changed, 9 insertions, 0 deletions

diff --git a/src/basic/user-util.h b/src/basic/user-util.h
index 6b2f1af52..2bd1ee9a7 100644
--- a/src/basic/user-util.h
+++ b/src/basic/user-util.h
@@ -108,6 +108,15 @@ bool valid_user_group_name_or_id(const char *u);
 bool valid_gecos(const char *d);
 bool valid_home(const char *p);
 
+static inline bool valid_shell(const char *p) {
+        /* We have the same requirements, so just piggy-back on the home check.
+         *
+         * Let's ignore /etc/shells because this is only applicable to real and
+         * not system users. It is also incompatible with the idea of empty /etc.
+         */
+        return valid_home(p);
+}
+
 int maybe_setgroups(size_t size, const gid_t *list);
 
 bool synthesize_nobody(void);