Magisk/scripts/update_binary.sh
osm0sis ce84f1762c scripts: fix sloppy/unpredictable cmd && this || that statements
- be a bit more POSIX to avoid any potential issues when full shell stdout/err are redirected
- actual logic chains remain unchanged
2020-12-06 23:48:43 -08:00

38 lines
805 B
Bash

#!/sbin/sh
X86_CNT=__X86_CNT__
extract_bb() {
touch "$BBBIN"
chmod 755 "$BBBIN"
dd if="$0" of="$BBBIN" bs=1024 skip=1 count=$X86_CNT
"$BBBIN" >/dev/null 2>&1 || dd if="$0" of="$BBBIN" bs=1024 skip=$(($X86_CNT + 1))
}
setup_bb() {
mkdir -p $TMPDIR 2>/dev/null
BBBIN=$TMPDIR/busybox
extract_bb
}
export BBBIN
case "$1" in
"extract"|"-x")
BBBIN=./busybox
[ -z "$2" ] || BBBIN="$2"
extract_bb
;;
"sh")
TMPDIR=.
setup_bb
shift
exec ./busybox sh -o standalone "$@"
;;
*)
TMPDIR=/dev/tmp
rm -rf $TMPDIR 2>/dev/null
setup_bb
export INSTALLER=$TMPDIR/install
$BBBIN mkdir -p $INSTALLER
$BBBIN unzip -o "$3" -d $INSTALLER >&2
exec $BBBIN sh -o standalone $INSTALLER/META-INF/com/google/android/updater-script "$@"
;;
esac
exit