From 9df16b85784fc6eb494444b04b04890c5c6ef0f8 Mon Sep 17 00:00:00 2001
From: bol-van <k@vodka.home.kg>
Date: Sat, 6 Nov 2021 11:45:59 +0300
Subject: [PATCH] init.d: sysv adduser_compat check readonly /etc

---
 init.d/sysv/functions | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/init.d/sysv/functions b/init.d/sysv/functions
index da5c361..1d88bcc 100644
--- a/init.d/sysv/functions
+++ b/init.d/sysv/functions
@@ -31,14 +31,18 @@ user_exists()
 useradd_compat()
 {
 	# $1 - username
-	if exists useradd ; then
-		useradd --no-create-home --system --shell /bin/false $1
-	elif is_linked_to_busybox adduser ; then
-		# busybox has special adduser syntax
-		adduser -S -H -D $1
-	elif exists adduser; then
-		adduser --no-create-home --system --disabled-login $1
-	fi
+
+	# skip for readonly systems
+	[ -w "/etc" ] && {
+		if exists useradd ; then
+			useradd --no-create-home --system --shell /bin/false $1
+		elif is_linked_to_busybox adduser ; then
+			# busybox has special adduser syntax
+			adduser -S -H -D $1
+		elif exists adduser; then
+			adduser --no-create-home --system --disabled-login $1
+		fi
+	}
 	user_exists $1
 }
 prepare_user()