Add halium-chroot script

Simple script that:
- Mounts rootfs.img, system.img and /target/data
- Opens an interactive shell or executes a non-interactive
  command in the chroot /target
- Umounts everything again

Author: ZeroPointEnergy

halium-chroot

@@ -0,0 +1,61 @@
+#!/bin/bash
+#
+# This script will:
+# - mount rootfs.img, system.img and /data
+# - enter an interactive shell in the chroot or execute
+#   a given command
+# - umount rootfs, system and /data
+#
+# Usage:
+#
+# To get an interactive shell in the chroot simply enter:
+# ./halium-chroot
+#
+# To directly execute a non-interactive program run:
+# ./halium-chroot my-program
+#
+
+mount_all()
+{
+	adb shell <<-SHELL
+		mkdir -p /target
+		mount /data/rootfs.img /target
+		mount /data/system.img /target/system
+		mount --bind /data /target/data
+		exit
+	SHELL
+}
+
+umount_all()
+{
+	adb shell <<-SHELL
+		umount -rl /target
+		exit
+	SHELL
+}
+
+mount_all > /dev/null
+
+CHROOT='TERM=linux HOME=/root PATH=/sbin:/bin:/usr/sbin:/usr/bin:$PATH chroot /target'
+
+if [ $# -eq 0 ]
+then # Interactive shell
+	if [ $(which tmux) ]
+	then # with tmux installed
+		tmux new-session -s halium-adb -d 'adb shell'
+		sleep 1
+		tmux send-keys -t halium-adb "${CHROOT} /bin/bash; exit"$'\n'
+		tmux attach -t halium-adb
+	else # without tmux installed
+		echo 'To automatically get an interactive chroot session, install'
+		echo 'The program "tmux". To enter the chroot environment run:'
+		echo
+		echo "${CHROOT} /bin/bash"
+		echo
+		adb shell
+	fi
+else # Non-interactive command
+	adb shell "${CHROOT} /bin/bash -c \"${@}\""
+fi
+
+umount_all > /dev/null