1 files changed, 157 insertions, 0 deletions
diff --git a/recipes-core/multitech/overlayfs-init-jffs2/overlayfs b/recipes-core/multitech/overlayfs-init-jffs2/overlayfs
new file mode 100755
index 0000000..1bf0a58
--- /dev/null
+++ b/recipes-core/multitech/overlayfs-init-jffs2/overlayfs
@@ -0,0 +1,157 @@
+#!/bin/bash
+# Command to erase user data file system
+
+MNT_USER="/mnt/user"
+OVERLAY="$MNT_USER/overlay"
+WORKDIR="$MNT_USER/work"
+UPPERDIR="$MNT_USER/upper"
+LOWERDIR="/"
+USER_ORIG="$UPPERDIR/orig"
+USER_PARTITION="User data"
+TABLE=$'\n'"$(cat /proc/mtd)"
+
+
+# Erase the file system
+DO_ERASE_PERSISTENT="/mnt/user/.persistent/mts_do_erase_persistent"
+# Remove files not hidden
+DO_CLEAR_PERSISTENT="/mnt/user/.persistent/mts_do_clear_persistent"
+
+pid=$$
+prefix="<3>overlayrootfs-generator[${pid}]: "
+loginfo()  { echo "${prefix}$@" >/dev/kmsg ; }
+logpipe() {
+   OIFS="${IFS}"
+   IFS=$'\n'
+   while read ln ; do
+        echo -n "${prefix}${ln}" >/dev/kmsg
+   done
+   IFS="${OIFS}"
+}
+
+if [[ $TABLE =~ [[:space:]]mtd([[:digit:]]+)[^\"]*\"$USER_PARTITION\" ]] ; then
+   USER_DEV=/dev/mtd${BASH_REMATCH[1]}
+else
+   loginfo "Cannot find a User data partition"
+   exit 0
+fi
+
+fs="/dev /proc /sys /run /var/volatile /dev/pts /sys/kernel/debug /sys/kernel/config"
+ 
+
+mnt_user() {
+    mkdir -p $MNT_USER
+    mount -t jffs2 $USER_DEV $MNT_USER
+}
+
+my_switch_root() {
+    NEW_ROOT=$1
+    loginfo mountinfo
+    mount --make-rprivate /
+    loginfo "my_switch_root: Mount file systems"
+    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
+        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 $MNT_USER/*.old
+    shopt -u dotglob
+}
+
+# select files for deletion
+do_clear_old() {
+    # when "clear user data" is requested - mark all non-hidden files for deletion
+    loginfo "Clearing user data. Persistent data will be left "
+
+    for FILE_PATH in "$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
+}
+
+# Most efficient way to clear UBIFS file system
+do_erase_old() {
+    loginfo "Erasing user data"
+    # Sys must be mounted to use ubifs utilities
+    mount -t sysfs sysfs /sys
+
+    umount -l $MNT_USER
+    loginfo "Erase user-data partition $USER_DEV"
+    ls -l ${USER_DEV} 2>&1 | logpipe
+    flash_erase -j ${USER_DEV} 0 0 2>&1 | logpipe
+    mnt_user
+}
+
+do_rw_mount() {
+    loginfo "Starting RW overlayfs"
+    mount -t tmpfs inittemp /mnt
+
+    mnt_user # user_data is now accessible
+    do_remove_old
+    cat /proc/mounts | logpipe
+    loginfo "ls -lad /mnt"
+    ls -lad /mnt 2>&1 | logpipe
+    loginfo "ls -lad /mnt/user"
+    ls -lad /mnt/user 2>&1 | logpipe
+    loginfo "ls -lad /mnt/user/.persistent"
+    ls -lad /mnt/user/.persistent 2>&1 | logpipe
+    loginfo "ls -la /mnt/user/.persistent"
+    ls -la /mnt/user/.persistent 2>&1 | logpipe
+    loginfo "ls -lad $DO_ERASE_PERSISTENT"
+    ls -lad "$DO_ERASE_PERSISTENT" 2>&1 | logpipe
+    
+    if [[ -f $DO_ERASE_PERSISTENT ]] ; then
+        loginfo "do_erase_old is next"
+        do_erase_old
+    elif [[ -f $DO_CLEAR_PERSISTENT ]] ; then
+        do_clear_old
+    fi
+
+    mkdir -p $UPPERDIR $WORKDIR $OVERLAY $USER_ORIG ${MNT_USER}/.persistent
+    loginfo "Mounting..."
+    mount -o index=off,metacopy=off,noatime,lowerdir=$LOWERDIR,upperdir=$UPPERDIR,workdir=$WORKDIR,rw -t overlay overlay $OVERLAY
+    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 $OVERLAY
+    cat /proc/mounts | grep overlay | logpipe
+    mount -o remount,rw /
+    cat /proc/mounts | grep overlay | logpipe
+    cat /proc/mounts | grep tmp | logpipe
+    umount -l /tmp >/dev/null 2>&1
+    umount -l /var/volatile >/dev/null 2>&1
+    cgroupmnts=$(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
+        fi
+    done
+}
+
+do_start() {
+    do_rw_mount
+}
+
+case $1 in
+start)
+    do_start
+;;
+*)
+    echo "Usage: $0 {start}"
+;;
+esac