1 files changed, 88 insertions, 0 deletions
diff --git a/recipes-core/multitech/overlayfs-init/overlayfs.init b/recipes-core/multitech/overlayfs-init/overlayfs.init
new file mode 100644
index 0000000..4da6217
--- /dev/null
+++ b/recipes-core/multitech/overlayfs-init/overlayfs.init
@@ -0,0 +1,88 @@
+#!/bin/bash
+
+MNT_USER="/mnt/user"
+OVERLAY="$MNT_USER/overlay"
+WORKDIR="$MNT_USER/work"
+UPPERDIR="$MNT_USER/upper"
+LOWERDIR="/"
+USER_ORIG="$UPPERDIR/orig"
+USER_PARTITION="/dev/mtdblock9"
+DO_ERASE_USERDATA_FILE="/mnt/user/.persistent/mts_do_erase_userdata"
+
+loginfo()  { logger -s -t overlayfs "info: $@" 1>&2 ; }
+
+mnt_user() {
+    mkdir -p $MNT_USER
+    mount -t jffs2 $USER_PARTITION $MNT_USER
+}
+
+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
+    /sbin/pivot_root $NEW_ROOT $NEW_ROOT/orig
+}
+
+# remove old hidden and non-hidden files and folders
+do_remove_old() {
+    shopt -s dotglob
+    rm -rf $MNT_USER/*.old
+    shopt -u dotglob
+}
+
+# select files for deletion
+do_select_old() {
+    if [[ -f $DO_ERASE_USERDATA_FILE ]]; then
+        # when "erase user data" is requested - mark all hidden and non-hidden files for deletion
+        shopt -s dotglob
+        trap  "shopt -u dotglob" RETURN
+        loginfo "Erasing user data"
+    else
+        # when "clear user data" is requested - mark all non-hidden files for deletion
+        loginfo "Clearing user data"
+    fi
+
+    for FILE_PATH in "$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"
+    done
+}
+
+do_rw_mount() {
+    loginfo "Starting RW overlayfs"
+    mount -t tmpfs inittemp /mnt
+    mnt_user
+
+    do_remove_old
+
+    if u-boot printenv default_reset_f; then
+        do_select_old
+        do_remove_old
+        u-boot setenv default_reset_f
+    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
+
+    mkdir -p ${OVERLAY}/var/persistent
+    mount --bind ${MNT_USER}/.persistent ${OVERLAY}/var/persistent
+
+    switch_root $OVERLAY
+}
+
+do_start() {
+    do_rw_mount
+}
+
+case $1 in
+start)
+    do_start
+;;
+*)
+    echo "Usage: $0 {start}"
+;;
+esac