From 975b96699e4bd93d14f2d15fc2ba581574b5e68f Mon Sep 17 00:00:00 2001
From: John Klug <john.klug@multitech.com>
Date: Mon, 26 Jul 2021 18:10:53 -0500
Subject: Adopts overlay for ubifs

---
 .../multitech/overlayfs-init/overlayfs.init        | 59 +++++++++++++++++-----
 1 file changed, 45 insertions(+), 14 deletions(-)

(limited to 'recipes-core')

diff --git a/recipes-core/multitech/overlayfs-init/overlayfs.init b/recipes-core/multitech/overlayfs-init/overlayfs.init
index 4da6217..72a6217 100644
--- a/recipes-core/multitech/overlayfs-init/overlayfs.init
+++ b/recipes-core/multitech/overlayfs-init/overlayfs.init
@@ -1,4 +1,10 @@
 #!/bin/bash
+# To turn on systemd debug:
+# setenv bootargs "systemd.log_level=debug console=ttymxc0,115200 ubi.mtd=nandubi root=ubi0:rootfs rootfstype=ubifs ro
+# rootflags=chk_data_crc mtdparts=gpmi-nand:4m(nandboot),-(nandubi)"
+
+# Command to erase user data file system
+# Modified for ubifs, secure boot (no U-Boot access)
 
 MNT_USER="/mnt/user"
 OVERLAY="$MNT_USER/overlay"
@@ -6,22 +12,32 @@ WORKDIR="$MNT_USER/work"
 UPPERDIR="$MNT_USER/upper"
 LOWERDIR="/"
 USER_ORIG="$UPPERDIR/orig"
-USER_PARTITION="/dev/mtdblock9"
+USER_PARTITION="ubi0:user-data"
 DO_ERASE_USERDATA_FILE="/mnt/user/.persistent/mts_do_erase_userdata"
+DO_CLEAR_USERDATA_FILE="/mnt/user/.persistent/mts_do_clear_userdata"
 
-loginfo()  { logger -s -t overlayfs "info: $@" 1>&2 ; }
+pid=$$
+prefix="<3>overlayrootfs-generator[${pid}]: "
+loginfo()  { echo "${prefix}$@" >/dev/kmsg ; }
+logpipe() { cat <(echo -n "${prefix}") - >/dev/kmsg ; }
 
 mnt_user() {
     mkdir -p $MNT_USER
-    mount -t jffs2 $USER_PARTITION $MNT_USER
+    mount -t ubifs $USER_PARTITION $MNT_USER
 }
 
-switch_root() {
+fs="/run /dev /proc /sys /sys/kernel/security /dev/shm /dev/pts /run /sys/fs/cgroup /sys/fs/cgroup/unified
+ /sys/fs/cgroup/systemd /sys/fs/cgroup/devices /sys/fs/cgroup/freezer /sys/fs/cgroup/pids /sys/fs/cgroup/memory
+ /dev/mqueue /sys/kernel/debug /tmp /sys/fs/fuse/connections /sys/kernel/config /var/volatile"
+ 
+my_switch_root() {
     NEW_ROOT=$1
-    mount -o noatime,move --bind /run $NEW_ROOT/run
-    mount -o noatime,move --bind /dev $NEW_ROOT/dev
-    mount -o noatime,move --bind /proc $NEW_ROOT/proc
-    mount -o noatime,move --bind /sys $NEW_ROOT/sys
+    echo mountinfo >&2
+    cat /proc/mounts >&2
+    mount --make-rprivate /
+    for f in $fs ; do
+        mount -o noatime,move --bind $f $NEW_ROOT/$f
+    done
     /sbin/pivot_root $NEW_ROOT $NEW_ROOT/orig
 }
 
@@ -57,21 +73,36 @@ do_rw_mount() {
     mnt_user
 
     do_remove_old
-
-    if u-boot printenv default_reset_f; then
+    if [[ -f $DO_CLEAR_USERDATA_FILE ]] || [[ -f $DO_ERASE_USERDATA_FILE ]] ; then
         do_select_old
         do_remove_old
-        u-boot setenv default_reset_f
+        rm -f $DO_CLEAR_USERDATA_FILE 
     fi
 
     mkdir -p $UPPERDIR $WORKDIR $OVERLAY $USER_ORIG ${MNT_USER}/.persistent
     loginfo "Mounting..."
-    mount -o noatime,lowerdir=$LOWERDIR,upperdir=$UPPERDIR,workdir=$WORKDIR -t overlay overlay $OVERLAY
+    set -x
+    mount -o noatime,lowerdir=$LOWERDIR,upperdir=$UPPERDIR,workdir=$WORKDIR,rw -t overlay overlay $OVERLAY
+    loginfo "JAK: What does overlay look like in /proc/mounts?"
+    cat /proc/mounts | grep overlay | logpipe
 
     mkdir -p ${OVERLAY}/var/persistent
-    mount --bind ${MNT_USER}/.persistent ${OVERLAY}/var/persistent
 
-    switch_root $OVERLAY
+    mount --bind ${MNT_USER}/.persistent ${OVERLAY}/var/persistent
+    loginfo "Switch root to $OVERLAY"
+    my_switch_root $OVERLAY
+    cat /proc/mounts | grep overlay >&2
+    mount -o remount,rw /
+    cat /proc/mounts | grep overlay | logpipe
+    cat /proc/mounts | grep tmp | logpipe
+    umount -l /tmp
+    umount -l /var/volatile
+    cgroupmnts=$(sed -r -e 's/[^[:space:]]*[[:space:]]//'  -e 's/[[:space:]]+.*//g' /proc/mounts | grep '^/orig')
+    for mp in ${cgroupmnts} ; do
+        if [[ $mp != /orig ]] ; then
+            umount -l $mp
+        fi
+    done
 }
 
 do_start() {
-- 
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