From 776d0e4e15cf0ac96730b15cdb505ccbd1e06371 Mon Sep 17 00:00:00 2001
From: Serhii Voloshynov <serhii.voloshynov@globallogic.com>
Date: Tue, 6 Jun 2023 11:25:02 +0300
Subject: failed to perform reset to factory defaults and user defaults when
 there is no space on /var/persistent GP-1997

---
 .../multitech/overlayfs-init-jffs2/overlayfs.init  | 55 +++++++++-------------
 1 file changed, 22 insertions(+), 33 deletions(-)

diff --git a/recipes-core/multitech/overlayfs-init-jffs2/overlayfs.init b/recipes-core/multitech/overlayfs-init-jffs2/overlayfs.init
index 7a4d26d..5714fa3 100644
--- a/recipes-core/multitech/overlayfs-init-jffs2/overlayfs.init
+++ b/recipes-core/multitech/overlayfs-init-jffs2/overlayfs.init
@@ -12,9 +12,9 @@ TABLE=$'\n'"$(cat /proc/mtd)"
 
 
 # Erase the file system
-DO_ERASE_PERSISTENT="/mnt/user/.persistent/mts_do_erase_persistent"
+DO_ERASE_PERSISTENT=$(u-boot printenv erase_persistent_f | cut -d '"' -f2 | grep -Eo '[0-9]+$' || true)
 # Remove files not hidden
-DO_CLEAR_PERSISTENT="/mnt/user/.persistent/mts_do_clear_persistent"
+DO_ERASE_ALL_EXCEPT_PERSISTENT=$(u-boot printenv default_reset_f | cut -d '"' -f2 | grep -Eo '[0-9]+$' || true)
 
 pid=$$
 prefix="<3>overlayrootfs-generator[${pid}]: "
@@ -37,7 +37,7 @@ else
 fi
 
 fs="/dev /proc /sys /run /var/volatile /dev/pts /sys/kernel/debug /sys/kernel/config"
- 
+
 
 mnt_user() {
     mkdir -p $MNT_USER
@@ -52,37 +52,27 @@ my_switch_root() {
     for f in $fs ; do
         if [[ -d $NEW_ROOT/$f ]] ; then
             loginfo "my_switch_root: mount -o noatime,move --bind $f $NEW_ROOT/$f"
-            mount -o noatime,move --bind $f $NEW_ROOT/$f
+            mount -o noatime,move --bind "$f" "$NEW_ROOT/$f"
         else
             # loginfo "my_switch_root: Skipping $NEW_ROOT/$f"
             :
         fi
     done
-    /sbin/pivot_root $NEW_ROOT $NEW_ROOT/orig
-}
-
-do_remove_old() {
-    shopt -s dotglob
-    rm -rf $MNT_USER/*.old
-    shopt -u dotglob
+    /sbin/pivot_root "$NEW_ROOT" "$NEW_ROOT"/orig
 }
 
-# select files for deletion
-do_clear_old() {
-    # when "clear user data" is requested - mark all non-hidden files for deletion
+do_erase_all_except_persistent() {
+    # Delete all files and folders except for the "${MNT_USER}/.persistent" directory.
     loginfo "Clearing user data. Persistent data will be left "
-
-    for FILE_PATH in "$MNT_USER"/*; do
-        FILE_NAME=$(basename "$FILE_PATH")
-        # rename all files and folders that exist in /mnt/user
-        mv "$FILE_PATH" "$MNT_USER/$FILE_NAME.old" 2>&1 | logpipe
-    done
-    do_remove_old
-    rm -f $DO_CLEAR_PERSISTENT
+    #UPPERDIR has to be cleared except 'orig' folder
+    #erasing folders in ${UPPERDIR}
+    find ${UPPERDIR} -maxdepth 1 -type d | grep "${UPPERDIR}/" | grep -v orig | xargs rm -rf
+    #erasing rest (files, if they are there) in ${UPPERDIR}
+    rm ${UPPERDIR}/* >/dev/null 2>&1
 }
 
 # Most efficient way to clear UBIFS file system
-do_erase_old() {
+do_erase_persistent() {
     loginfo "Erasing user data"
     # Sys must be mounted to use ubifs utilities
     mount -t sysfs sysfs /sys
@@ -98,12 +88,13 @@ do_rw_mount() {
     mount -t tmpfs inittemp /mnt
 
     mnt_user # user_data is now accessible
-    do_remove_old
-
-    if [[ -f $DO_ERASE_PERSISTENT ]] ; then
-        do_erase_old
-    elif [[ -f $DO_CLEAR_PERSISTENT ]] ; then
-        do_clear_old
+    if [[ "$DO_ERASE_PERSISTENT" -eq 1 ]] ; then
+        do_erase_persistent
+        u-boot setenv default_reset_f
+        u-boot setenv erase_persistent_f 0
+    elif [[ "$DO_ERASE_ALL_EXCEPT_PERSISTENT" -eq 1 ]] ; then
+        do_erase_all_except_persistent
+        u-boot setenv default_reset_f
     fi
 
     mkdir -p $UPPERDIR $WORKDIR $OVERLAY $USER_ORIG ${MNT_USER}/.persistent
@@ -112,11 +103,9 @@ do_rw_mount() {
     loginfo "/proc/mounts:"
     cat /proc/mounts | grep overlay | logpipe
 
-    mkdir -p ${OVERLAY}/var/persistent
-
-    mount --bind ${MNT_USER}/.persistent ${OVERLAY}/var/persistent
     loginfo "Switch root to $OVERLAY"
     my_switch_root $OVERLAY
+    mount --bind /orig/mnt/user/.persistent/ /var/persistent
     cat /proc/mounts | grep overlay | logpipe
     mount -o remount,rw /
     cat /proc/mounts | grep overlay | logpipe
@@ -126,7 +115,7 @@ do_rw_mount() {
     cgroupmnts=$(sed -r -e 's/[^[:space:]]*[[:space:]]//'  -e 's/[[:space:]]+.*//g' /proc/mounts | grep '^/orig')
     for mp in ${cgroupmnts} ; do
         if [[ $mp != /orig ]] && [[ -d $mp ]] ; then
-            umount -l $mp >/dev/null 2>&1
+            umount -l "$mp" >/dev/null 2>&1
         fi
     done
 }
-- 
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