diff options
Diffstat (limited to 'recipes-core/multitech/overlayfs-init-ubi/overlayfs.init')
-rw-r--r-- | recipes-core/multitech/overlayfs-init-ubi/overlayfs.init | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/recipes-core/multitech/overlayfs-init-ubi/overlayfs.init b/recipes-core/multitech/overlayfs-init-ubi/overlayfs.init new file mode 100644 index 0000000..72a6217 --- /dev/null +++ b/recipes-core/multitech/overlayfs-init-ubi/overlayfs.init @@ -0,0 +1,119 @@ +#!/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="$MNT_USER/overlay" +WORKDIR="$MNT_USER/work" +UPPERDIR="$MNT_USER/upper" +LOWERDIR="/" +USER_ORIG="$UPPERDIR/orig" +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" + +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 ubifs $USER_PARTITION $MNT_USER +} + +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 + 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 +} + +# 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 [[ -f $DO_CLEAR_USERDATA_FILE ]] || [[ -f $DO_ERASE_USERDATA_FILE ]] ; then + do_select_old + do_remove_old + rm -f $DO_CLEAR_USERDATA_FILE + fi + + mkdir -p $UPPERDIR $WORKDIR $OVERLAY $USER_ORIG ${MNT_USER}/.persistent + loginfo "Mounting..." + set -x + mount -o noatime,lowerdir=$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 + 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() { + do_rw_mount +} + +case $1 in +start) + do_start +;; +*) + echo "Usage: $0 {start}" +;; +esac |