scripts: add script to get a shell inside the Android container

scripts/anbox-shell.sh

@@ -0,0 +1,36 @@
+#!/bin/sh
+
+if [ "$(id -u)" -ne 0 ]; then
+    echo "ERROR: You need to run this script as root!"
+    exit 1
+fi
+
+CONTAINER_PATH="$SNAP_COMMON/containers"
+CONTAINER_NAME=default
+
+if [ -z "$SNAP" ] ; then
+    CONTAINER_PATH=/var/lib/anbox/containers
+fi
+
+state=$(lxc-info -P "$CONTAINER_PATH" -n "$CONTAINER_NAME" -s | cut -d':' -f 2 | tr -d '[:space:]')
+if [ "$state" != "RUNNING" ] ; then
+    echo "ERROR: Cannot attach to container as it is not running"
+    exit 1
+fi
+
+echo "NOTE: This shell will give you full root access inside the Android"
+echo "      container. Be careful with what you're doing!"
+echo
+
+exec lxc-attach \
+    -q \
+    --clear-env \
+    -P "$CONTAINER_PATH" \
+    -n "$CONTAINER_NAME" \
+    -v PATH=/sbin:/system/bin:/system/sbin:/system/xbin \
+    -v ANDROID_ASSETS=/assets \
+    -v ANDROID_DATA=/data \
+    -v ANDROID_ROOT=/system \
+    -v ANDROID_STORAGE=/storage \
+    -v ASEC_MOUNTPOINT=/mnt/asec \
+    -v EXTERNAL_STORAGE=/sdcard -- /system/bin/sh

snap/snapcraft.yaml

@@ -37,6 +37,8 @@ apps:
     daemon: simple
   collect-bug-info:
     command: bin/collect-bug-info.sh
+  shell:
+    command: bin/anbox-shell.sh
   android-settings:
     command: desktop-launch $SNAP/bin/app-android-settings.sh
     desktop: desktop/android-settings.desktop
@@ -159,8 +161,10 @@ parts:
       collect-bug-info.sh: bin/collect-bug-info.sh
       app-android-settings.sh: bin/app-android-settings.sh
       app-appmgr.sh: bin/app-appmgr.sh
+      anbox-shell.sh: bin/anbox-shell.sh
     prime:
       - bin/anbox-bridge.sh
+      - bin/anbox-shell.sh
       - bin/anbox-wrapper.sh
       - bin/container-manager.sh
       - bin/collect-bug-info.sh