remote_install.sh

#!/usr/bin/env bash
FILENAME=$1
USERDATA_DEVICE=/dev/block/by-name/userdata
FORWARD_PORT=5555
# check if filename has been provided
if [ $# -ne 1 ]; then
  echo "Usage: $(basename $0) FILENAME"
  exit 1
fi
# check if adb is available
if ! [ -x "$(command -v adb)" ]; then
  echo "Error: adb is not installed" >&2
  exit 1
fi
# check if pv is available
if ! [ -x "$(command -v pv)" ]; then
  echo "Error: pv is not installed" >&2
  exit 1
fi
# check if nc is available
if ! [ -x "$(command -v nc)" ]; then
  echo "Error: nc is not installed" >&2
  exit 1
fi
# check if file(system.img) exists and is readable
if ! [ -r $FILENAME ]; then
  echo "Error: $FILENAME is not readable!" >&2
  exit 1
fi
# check if device is available via adb
adb_state=$(adb get-state 2>/dev/null)
if [ "$adb_state" != "recovery" ]; then
  echo "Error: did not find a device in recovery mode!" >&2
  exit 1
fi
# check if device has twrp
adb shell "command -v twrp > /dev/null"
if [ $? -ne 0 ]; then
  echo "Error: device is not running twrp!" >&2
  exit 1
fi
# check if userdata-device exists
adb shell "[ -w $USERDATA_DEVICE ]"
if [ $? -ne 0 ]; then
  echo "Error: could not find userdata-partition on device!" >&2
  exit 1
fi

cleanup() {
  # remove adb forward
  echo "+ removing port-forward"
  adb forward --remove tcp:$FORWARD_PORT &>/dev/null
}

main() {
  # create adb forward
  echo "+ creating port-forward"
  adb forward tcp:$FORWARD_PORT tcp:$FORWARD_PORT
  sleep 1
  # run nc|gunzip|dd on device
  echo "+ starting receiver"
  $(adb shell "nc -l -p $FORWARD_PORT|gunzip|dd of=$USERDATA_DEVICE") &
  sleep 1
  # run pv|gzip|on local device
  echo "+ starting sender"
  pv $FILENAME|gzip|nc -N 127.0.0.1 $FORWARD_PORT
  echo "+ done"
  exit 0
}

trap exit INT TERM ERR
trap cleanup EXIT
main