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131 lines
2.8 KiB
131 lines
2.8 KiB
#!/sbin/sh
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#
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# Backup and restore addon /system files
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#
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export C=/tmp/backupdir
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export S=$2
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export V=17.1
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export ADDOND_VERSION=1
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# Scripts in /system/addon.d expect to find backuptool.functions in /tmp
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cp -f /tmp/install/bin/backuptool.functions /tmp
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# Preserve /system/addon.d in /tmp/addon.d
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preserve_addon_d() {
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if [ -d $S/addon.d/ ]; then
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mkdir -p /tmp/addon.d/
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cp -a $S/addon.d/* /tmp/addon.d/
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# Discard any scripts that aren't at least our version level
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for f in /postinstall/tmp/addon.d/*sh; do
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SCRIPT_VERSION=$(grep "^# ADDOND_VERSION=" $f | cut -d= -f2)
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if [ -z "$SCRIPT_VERSION" ]; then
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SCRIPT_VERSION=1
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fi
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if [ $SCRIPT_VERSION -lt $ADDOND_VERSION ]; then
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rm $f
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fi
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done
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chmod 755 /tmp/addon.d/*.sh
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fi
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}
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# Restore /system/addon.d from /tmp/addon.d
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restore_addon_d() {
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if [ -d /tmp/addon.d/ ]; then
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mkdir -p $S/addon.d/
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cp -a /tmp/addon.d/* $S/addon.d/
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rm -rf /tmp/addon.d/
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fi
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}
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# Proceed only if /system is the expected major and minor version
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check_prereq() {
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# If there is no build.prop file the partition is probably empty.
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if [ ! -r $S/build.prop ]; then
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return 0
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fi
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if ! grep -q "^ro.lineage.version=$V.*" $S/build.prop; then
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echo "Not backing up files from incompatible version: $V"
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return 0
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fi
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return 1
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}
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check_blacklist() {
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if [ -f $S/addon.d/blacklist -a -d /$1/addon.d/ ]; then
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## Discard any known bad backup scripts
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cd /$1/addon.d/
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for f in *sh; do
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[ -f $f ] || continue
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s=$(md5sum $f | cut -c-32)
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grep -q $s $S/addon.d/blacklist && rm -f $f
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done
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fi
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}
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check_whitelist() {
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found=0
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if [ -f $S/addon.d/whitelist ];then
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## forcefully keep any version-independent stuff
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cd /$1/addon.d/
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for f in *sh; do
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s=$(md5sum $f | cut -c-32)
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grep -q $s $S/addon.d/whitelist
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if [ $? -eq 0 ]; then
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found=1
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else
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rm -f $f
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fi
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done
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fi
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return $found
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}
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# Execute /system/addon.d/*.sh scripts with $1 parameter
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run_stage() {
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if [ -d /tmp/addon.d/ ]; then
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for script in $(find /tmp/addon.d/ -name '*.sh' |sort -n); do
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$script $1
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done
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fi
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}
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case "$1" in
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backup)
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mkdir -p $C
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if check_prereq; then
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if check_whitelist system; then
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exit 127
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fi
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fi
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check_blacklist system
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preserve_addon_d
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run_stage pre-backup
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run_stage backup
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run_stage post-backup
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;;
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restore)
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if check_prereq; then
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if check_whitelist tmp; then
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exit 127
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fi
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fi
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check_blacklist tmp
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run_stage pre-restore
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run_stage restore
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run_stage post-restore
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restore_addon_d
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rm -rf $C
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sync
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;;
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*)
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echo "Usage: $0 {backup|restore}"
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exit 1
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esac
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exit 0
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