Embed TAR file in a shell script

README.md

README.md

embeddedPayload-example.sh

embeddedPayload.sh

#!/usr/bin/env bash

# Instructions:
#       1) Create your TAR archive
#               tar -czpf file.tar <file1> <file2> ... <fileN>
#       2) Append the TAR file contents to the script
#               cat file.tar >> embeddedPayload.sh
#       3) Run script. (./embeddedPayload.sh)


SCRIPT_PATH="${BASH_SOURCE[0]:-$0}"
echo "Bash Source: ${SCRIPT_PATH}"


# Script Varibles
SCRIPT_DIR="$(cd -P "$(dirname "$SCRIPT_PATH")" && pwd)"
MARKER_PREFIX="__TARFILE_"
MARKER_SUFFIX="FOLLOWS__"
PAYLOAD_MARKER="${MARKER_PREFIX}${MARKER_SUFFIX}"
PAYLOAD_SIZE="$(
  PAYLOAD_MARKER="$PAYLOAD_MARKER" \
  perl -0777ne '
    my $marker = $ENV{PAYLOAD_MARKER} // exit 1;
    my $offset = rindex($_, $marker);
    exit 1 if $offset < 0;
    my $payload = substr($_, $offset + length($marker));
    exit 1 if length($payload) < 3 || substr($payload, 0, 3) ne "\x1f\x8b\x08";
    print length($payload);
  ' "$SCRIPT_PATH"
)"

echo "Script Dir: ${SCRIPT_DIR}"
echo "Payload Size: ${PAYLOAD_SIZE}"

# Extract
echo "Extracting install ... "
cd "$SCRIPT_DIR" || exit 1
if [ "${PAYLOAD_SIZE:-0}" -le 0 ]; then
  echo "No embedded payload found. Append a tar.gz archive to ${SCRIPT_PATH##*/} first." >&2
  exit 1
fi

PAYLOAD_MARKER="$PAYLOAD_MARKER" \
perl -0777ne '
  BEGIN { binmode STDOUT; }
  my $marker = $ENV{PAYLOAD_MARKER} // exit 1;
  my $offset = rindex($_, $marker);
  exit 1 if $offset < 0;
  print substr($_, $offset + length($marker));
' "$SCRIPT_PATH" | tar -xzpvf -

exit 0
# NOTE: Don't place any newline characters after the last line below.
__TARFILE_FOLLOWS__

file.tar