Fetches a ChromeOS image for ARM and extracts the Widevine and Flash binaries, saving them in a compressed archive

widevine-flash_armhf.sh

#!/bin/sh -eu

# Make sure we have wget or curl
available () {
  command -v "$1" >/dev/null 2>&1
}
if available wget; then
  DL="wget -O-"
  DL_SL="wget -qO-"
elif available curl; then
  DL="curl -L"
  DL_SL="curl -s"
else
  echo "Install Wget or cURL" >&2
  exit 1
fi

# Find a URL to a suitable armhf ChromeOS recovery image
CHROMEOS_URL="$($DL_SL https://dl.google.com/dl/edgedl/chromeos/recovery/recovery.conf | grep -A11 CB5-312T | sed -n 's/^url=//p')"
CHROMEOS_IMG="$(basename "$CHROMEOS_URL" .zip)"
if [ -e "$CHROMEOS_IMG" ]; then
  CHROMEOS_IMG_PATH="./"
  DEL_IMG=N
else
  CHROMEOS_IMG_PATH="$(mktemp -td ChromeOS-IMG.XXXXXX)"
  DEL_IMG=Y
  # Fetch the recovery image (2Gb+ on disk after download)
  $DL "$CHROMEOS_URL" | zcat > "$CHROMEOS_IMG_PATH/$CHROMEOS_IMG"
fi

# Note the next free loop device in a variable
LOOPD="$(losetup -f)"

# If root, we can mount silently (no popup windows after mount)
if [ "$USER" = "root" ]; then
  MNTPNT="$(mktemp -d -t ChromeOS.XXXXXX)"
  losetup -Pf "$CHROMEOS_IMG_PATH/$CHROMEOS_IMG"
  mount -o ro "${LOOPD}p3" "$MNTPNT"
else
  # Associate all the partitions on the disk image with loop devices:
  udisksctl loop-setup -rf "$CHROMEOS_IMG_PATH/$CHROMEOS_IMG"
  sleep 1
  # Mount the third partition of the disk image (if the previous did not do it automatically)
  if ! lsblk -lo MOUNTPOINT "${LOOPD}p3" | tail -n1 | grep -q \.; then
    udisksctl mount -b "${LOOPD}p3"
  fi
  # Note the mount point in a variable
  MNTPNT="$(lsblk -lo MOUNTPOINT "${LOOPD}p3" | tail -n1)"
fi

# Extract the libs out and copy them to a compressed tar archive
ARCHIVE_NAME="widevine-flash-$(date '+%Y%m%d')_armhf.tgz"
echo "Extracting and compressing files"
tar -C"$MNTPNT" -caf "$ARCHIVE_NAME" opt/google/chrome/libwidevinecdm.so opt/google/chrome/pepper/libpepflashplayer.so --xform 's/pepper/PepperFlash/' --format ustar
echo "Created: $ARCHIVE_NAME"

# Cleanup
if [ "$USER" = "root" ]; then
  umount "$MNTPNT"
  losetup -d "$LOOPD"
  rmdir "$MNTPNT"
else
  ALLMNTS="$(lsblk -lo NAME,MOUNTPOINT "$LOOPD" | sed -n '/\//s/^\(loop[0-9]\+p[0-9]\+\).*/\1/p')"
  echo "$ALLMNTS" | xargs -I{} -n1 udisksctl unmount -b /dev/{}
  if [ "$LOOPD" != "$(losetup -f)" ]; then
    udisksctl loop-delete -b "$LOOPD"
  fi
fi
if [ "$DEL_IMG" = "N" ] || [ "${1:-EMPTY}" = "-k" ]; then
  :
else
  rm "$CHROMEOS_IMG_PATH/$CHROMEOS_IMG"
  rmdir -v "$CHROMEOS_IMG_PATH"
fi

# Inform the user how to proceed
cat <<EOF

To install the contents of these files on an ARMhf device, copy the tar archive over to the target machine and issue the following:

  sudo tar -C/ -xf $ARCHIVE_NAME

EOF