From 426b1a7f7619e863ae0b25c6dd92ea0cee806854 Mon Sep 17 00:00:00 2001
From: John Klug <john.klug@multitech.com>
Date: Fri, 13 Aug 2021 11:12:32 -0500
Subject: Use file system for clearing user-data since U-Boot environment does
 not exist

---
 .../multitech/overlayfs-init-ubi/overlayfs.init    | 44 +++++++++++++++-------
 1 file changed, 31 insertions(+), 13 deletions(-)

(limited to 'recipes-core/multitech')

diff --git a/recipes-core/multitech/overlayfs-init-ubi/overlayfs.init b/recipes-core/multitech/overlayfs-init-ubi/overlayfs.init
index 72a6217..4b97968 100644
--- a/recipes-core/multitech/overlayfs-init-ubi/overlayfs.init
+++ b/recipes-core/multitech/overlayfs-init-ubi/overlayfs.init
@@ -1,8 +1,4 @@
 #!/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)
 
@@ -19,7 +15,14 @@ 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 ; }
+logpipe() {
+   OIFS="${IFS}"
+   IFS=$'\n'
+   while read ln ; do
+        echo -n "${prefix}${ln}" >/dev/kmsg
+   done
+   IFS="${OIFS}"
+}
 
 mnt_user() {
     mkdir -p $MNT_USER
@@ -32,8 +35,8 @@ fs="/run /dev /proc /sys /sys/kernel/security /dev/shm /dev/pts /run /sys/fs/cgr
  
 my_switch_root() {
     NEW_ROOT=$1
-    echo mountinfo >&2
-    cat /proc/mounts >&2
+    loginfo mountinfo
+    cat /proc/mounts | logpipe
     mount --make-rprivate /
     for f in $fs ; do
         mount -o noatime,move --bind $f $NEW_ROOT/$f
@@ -43,9 +46,25 @@ my_switch_root() {
 
 # remove old hidden and non-hidden files and folders
 do_remove_old() {
-    shopt -s dotglob
-    rm -rf $MNT_USER/*.old
-    shopt -u dotglob
+    if [[ -f $DO_ERASE_USERDATA_FILE ]] ; then
+        do_clear_old
+    else
+        shopt -s dotglob
+        rm -rf $MNT_USER/*.old
+        shopt -u dotglob
+    fi
+}
+
+# Most efficient way to clear UBIFS file system
+do_clear_old() {
+    umount -l $MNT_USER
+    ubiattach -m 1 || true
+    [[ $(ubinfo -d 0 -N user-data | grep 'Volume ID') =~ .*[[:space:]]+([0-9]+) ]]
+    DEV="/dev/ubi_${BASH_REMATCH[1]}"
+    loginfo "Erase user-data partition $DEV"
+    # Would be nice if ubiupdatevol took volume names instead of numbers
+    ubiupdatevol ${DEV} -t
+    mnt_user
 }
 
 # select files for deletion
@@ -81,9 +100,8 @@ do_rw_mount() {
 
     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?"
+    loginfo "/proc/mounts:"
     cat /proc/mounts | grep overlay | logpipe
 
     mkdir -p ${OVERLAY}/var/persistent
@@ -91,7 +109,7 @@ do_rw_mount() {
     mount --bind ${MNT_USER}/.persistent ${OVERLAY}/var/persistent
     loginfo "Switch root to $OVERLAY"
     my_switch_root $OVERLAY
-    cat /proc/mounts | grep overlay >&2
+    cat /proc/mounts | grep overlay | logpipe
     mount -o remount,rw /
     cat /proc/mounts | grep overlay | logpipe
     cat /proc/mounts | grep tmp | logpipe
-- 
cgit v1.2.3