From d12d300c983d9444f8f9c57827bc7f408e334ba7 Mon Sep 17 00:00:00 2001
From: Ludwig Nussel <ludwig.nussel@suse.de>
Date: Tue, 30 Nov 2021 17:14:14 +0100
Subject: [PATCH] useradd: assume uid 0 == root as fallback

In absence of /etc/passwd, eg when bootstrapping a chroot, resolving
uid 0 to a name may not work. Therefore just assume "root".
---
 src/useradd.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/useradd.c b/src/useradd.c
index f7c97958..16447671 100644
--- a/src/useradd.c
+++ b/src/useradd.c
@@ -2507,14 +2507,14 @@ int main (int argc, char **argv)
 	{
 		struct passwd *pampw;
 		pampw = getpwuid (getuid ()); /* local, no need for xgetpwuid */
-		if (pampw == NULL) {
+		if (pampw == NULL && getuid ()) {
 			fprintf (stderr,
 			         _("%s: Cannot determine your user name.\n"),
 			         Prog);
 			fail_exit (1);
 		}
 
-		retval = pam_start ("useradd", pampw->pw_name, &conv, &pamh);
+		retval = pam_start ("useradd", pampw?pampw->pw_name:"root", &conv, &pamh);
 	}
 
 	if (PAM_SUCCESS == retval) {