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Support A only System-as-root Devices

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Most Chinese devices (and supposedly Galaxy S10) running Android Pie
is using system-as-root without A/B partition.

https://source.android.com/devices/bootloader/system-as-root#about-system-as-root

According to the docs above, these devices will have a ramdisk block
with size 0 in their boot images. Since magiskinit can run independently
on system-as-root devices, we simply just create an empty ramdisk with
magiskinit added as init.

Huge thanks to @vvb2060 for the heads up and original PR.
Close #980, close #1102
This commit is contained in:
topjohnwu
2019-02-28 05:46:36 -05:00
parent 99d6bd8efc
commit e72c6685ed
4 changed files with 43 additions and 20 deletions
Download Patch File Download Diff File Expand all files Collapse all files

26
scripts/boot_patch.sh
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@ -87,10 +87,15 @@ esac
# Ramdisk restores
##########################################################################################
# Test patch status and do restore, after this section, ramdisk.cpio.orig is guaranteed to exist
# Test patch status and do restore
ui_print "- Checking ramdisk status"
./magiskboot --cpio ramdisk.cpio test
STATUS=$?
if [ -e ramdisk.cpio ]; then
./magiskboot --cpio ramdisk.cpio test
STATUS=$?
else
# Stock A only system-as-root
STATUS=0
fi
case $((STATUS & 3)) in
0 ) # Stock boot
ui_print "- Stock boot image detected"
@ -98,18 +103,24 @@ case $((STATUS & 3)) in
SHA1=`./magiskboot --sha1 "$BOOTIMAGE" 2>/dev/null`
STOCKDUMP=stock_boot_${SHA1}.img.gz
./magiskboot --compress "$BOOTIMAGE" $STOCKDUMP
cp -af ramdisk.cpio ramdisk.cpio.orig
cp -af ramdisk.cpio ramdisk.cpio.orig 2>/dev/null
;;
1 ) # Magisk patched
ui_print "- Magisk patched boot image detected"
# Find SHA1 of stock boot image
[ -z $SHA1 ] && SHA1=`./magiskboot --cpio ramdisk.cpio sha1 2>/dev/null`
./magiskboot --cpio ramdisk.cpio restore
cp -af ramdisk.cpio ramdisk.cpio.orig
if ./magiskboot --cpio ramdisk.cpio "exists init.rc"; then
# Normal boot image
cp -af ramdisk.cpio ramdisk.cpio.orig
else
# A only system-as-root
rm -f ramdisk.cpio
fi
;;
2 ) # Other patched
2 ) # Unsupported
ui_print "! Boot image patched by unsupported programs"
abort "! Please restore stock boot image"
abort "! Please restore back to stock boot image"
;;
esac
@ -127,6 +138,7 @@ echo "KEEPFORCEENCRYPT=$KEEPFORCEENCRYPT" >> config
"add 750 init magiskinit" \
"patch $KEEPVERITY $KEEPFORCEENCRYPT" \
"backup ramdisk.cpio.orig" \
"mkdir 000 .backup" \
"add 000 .backup/.magisk config"
if [ $((STATUS & 4)) -ne 0 ]; then