4a049b563c
* A/B OTA devices wont run backuptools in recovery (because they don't go in to recovery to do an OTA). In these cases let's use a modified version to backup/restore from within android upon postinstall. * Add backuptool_postinstall.sh which will be run prior to the normal postinstall script in order to backup/restore via addon.d scripts. * This needs to be done in such a manner because we need /postinstall mounted rw instead of the ro with context= options which are used for the normal postinstall (dexopt) script. Change-Id: I51511870634dd1ec5388adafddb446f95cc5a950
125 lines
3.1 KiB
Bash
Executable File
125 lines
3.1 KiB
Bash
Executable File
#!/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=15.1
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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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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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return 0
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fi
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grep -q "^ro.lineage.version=$V.*" /system/etc/prop.default /system/build.prop && return 1
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echo "Not backing up files from incompatible version: $V"
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return 0
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}
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check_blacklist() {
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if [ -f /system/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 /system/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 /system/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 /system/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 /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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mkdir -p $C
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if check_prereq; then
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if check_whitelist postinstall/system; then
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exit 127
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fi
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fi
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check_blacklist postinstall/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 postinstall/tmp; then
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exit 127
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fi
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fi
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check_blacklist postinstall/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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rm -rf /postinstall/tmp
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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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