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102 lines
2.6 KiB
102 lines
2.6 KiB
#!/system/bin/sh
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#
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# Backup and restore addon /system files
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#
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export S=/system
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export C=/postinstall/tmp/backupdir
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export V=18.0
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export ADDOND_VERSION=2
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# Scripts in /system/addon.d expect to find backuptool.functions in /tmp
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mkdir -p /postinstall/tmp/
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cp -f /postinstall/system/bin/backuptool_ab.functions /postinstall/tmp/backuptool.functions
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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 /system/addon.d/ ]; then
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mkdir -p /postinstall/tmp/addon.d/
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cp -a /system/addon.d/* /postinstall/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 $f
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fi
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done
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chmod 755 /postinstall/tmp/addon.d/*.sh
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fi
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}
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# Restore /postinstall/system/addon.d from /postinstall/tmp/addon.d
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restore_addon_d() {
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if [ -d /postinstall/tmp/addon.d/ ]; then
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mkdir -p /postinstall/system/addon.d/
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cp -a /postinstall/tmp/addon.d/* /postinstall/system/addon.d/
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rm -rf /postinstall/tmp/addon.d/
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fi
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}
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# Proceed only if /system is the expected major and minor version
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check_prereq() {
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# If there is no build.prop file the partition is probably empty.
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if [ ! -r /system/build.prop ]; then
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echo "Backup/restore is not possible. Partition is probably empty"
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return 1
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fi
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if ! grep -q "^ro.lineage.version=$V.*" /system/build.prop; then
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echo "Backup/restore is not possible. Incompatible ROM version: $V"
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return 2
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fi
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return 0
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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 /postinstall/tmp/addon.d/ ]; then
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for script in $(find /postinstall/tmp/addon.d/ -name '*.sh' |sort -n); do
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# we have no /sbin/sh in android, only recovery
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# use /system/bin/sh here instead
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sed -i '0,/#!\/sbin\/sh/{s|#!/sbin/sh|#!/system/bin/sh|}' $script
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# we can't count on /tmp existing on an A/B device, so utilize /postinstall/tmp
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# as a pseudo-/tmp dir
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sed -i 's|. /tmp/backuptool.functions|. /postinstall/tmp/backuptool.functions|g' $script
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$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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if check_prereq; then
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mkdir -p $C
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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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fi
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;;
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restore)
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if check_prereq; then
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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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rm -rf /postinstall/tmp
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sync
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fi
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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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