From ae327cc50fd9d3e59e9f60088243adfc69cb312e Mon Sep 17 00:00:00 2001
From: lonkaars <loek@pipeframe.xyz>
Date: Tue, 6 Feb 2024 10:46:39 +0100
Subject: fix busybox booting into root shell

---
 rootfs/etc/init.d/rcS |  3 +++
 rootfs/etc/inittab    |  7 +++----
 rootfs/etc/passwd     |  0
 rootfs/etc/profile    |  1 +
 rootfs/etc/shadow     |  0
 state/gen             |  5 +++++
 util/mkrootfs         | 17 +++++++----------
 7 files changed, 19 insertions(+), 14 deletions(-)
 delete mode 100644 rootfs/etc/passwd
 delete mode 100644 rootfs/etc/shadow

diff --git a/rootfs/etc/init.d/rcS b/rootfs/etc/init.d/rcS
index fc699e4..be9ca09 100755
--- a/rootfs/etc/init.d/rcS
+++ b/rootfs/etc/init.d/rcS
@@ -1,2 +1,5 @@
 #!/bin/sh
+# mount all drives in /etc/fstab
 /bin/mount -a
+# set the system hostname
+/bin/hostname -F /etc/hostname
diff --git a/rootfs/etc/inittab b/rootfs/etc/inittab
index 5f4a5fa..805a39d 100644
--- a/rootfs/etc/inittab
+++ b/rootfs/etc/inittab
@@ -1,9 +1,8 @@
 # /etc/inittab init(8)
-
 ::sysinit:/etc/init.d/rcS
 ::shutdown:/bin/umount -a -r
 ::restart:/sbin/init
 
-# this could be really unsafe in production
-::respawn:/sbin/getty -L ttyS0 115200 vt100
-ttyS0::respawn:-/bin/login -f root
+# put a shell on ttyS0 (serial header on board)
+ttyS0::respawn:/bin/sh
+
diff --git a/rootfs/etc/passwd b/rootfs/etc/passwd
deleted file mode 100644
index e69de29..0000000
diff --git a/rootfs/etc/profile b/rootfs/etc/profile
index 3c2be89..557b21a 100644
--- a/rootfs/etc/profile
+++ b/rootfs/etc/profile
@@ -1,4 +1,5 @@
 # /etc/profile
 umask 022
 export PATH="$PATH:/usr/bin"
+cd "$HOME"
 
diff --git a/rootfs/etc/shadow b/rootfs/etc/shadow
deleted file mode 100644
index e69de29..0000000
diff --git a/state/gen b/state/gen
index ddaf9d1..720c1d3 100755
--- a/state/gen
+++ b/state/gen
@@ -77,6 +77,11 @@ if [ -n "$SDCARD_DISK" ] ; then
 					if ($6 != "ROOTFS") exit(1)
 				}' && SDCARD_FMT_OK=0
 		fi
+	else
+		# assume sd card is formatted correctly if SDCARD_PART_BOOT and
+		# SDCARD_PART_ROOTFS are already set
+		SDCARD_PART_OK=0
+		SDCARD_FMT_OK=0
 	fi
 fi
 set_state sdcard_part $SDCARD_PART_OK
diff --git a/util/mkrootfs b/util/mkrootfs
index 5818fdb..91eff68 100755
--- a/util/mkrootfs
+++ b/util/mkrootfs
@@ -28,13 +28,10 @@ cp $CPFLAGS "$OVERLAY_FS/." .
 # setuid busybox
 chmod a=xrs,u+w bin/busybox
 
-# # create /etc/passwd
-# if ! [ -e etc/passwd ] ; then
-# 	# TODO: add root to a group
-# 	echo "root:x:0:0::/root:/bin/sh" > etc/passwd
-# fi
-# # and /etc/shadow
-# if ! [ -e etc/shadow ] ; then
-# 	echo "root:$(mkpasswd alpine):::::::" > etc/shadow
-# fi
-# 
+# create a root user
+! [ -e etc/passwd ] && echo "root:x:0:0::/root:/bin/sh" > etc/passwd
+! [ -e etc/shadow ] && echo "root:!:0:0:99999:0:::" > etc/shadow
+! [ -e etc/group ] && echo "root:x:0:root" > etc/shadow
+
+# exit safely (continue makefile)
+exit 0
-- 
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