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#!/bin/sh
#
# vigpg - edit an encrypted file
# Copyright (C) 2010-2015 Dustin Kirkland
#
# Authors: Dustin Kirkland <kirkland@ubuntu.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, version 3 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
set -e
# Create a temporary workspace, in memory
# Note that this unfortunately is not mlock(2)-able
cleartext_file=$(mktemp /dev/shm/.vigpg-XXXXXXXXXXXX)
# Ensure that we always remove the cleartext_file on any exit
trap "shred -f ${cleartext_file} ${cleartext_file}.gpg 2>/dev/null || true" EXIT HUP INT QUIT TERM
# Encrypted file from argv
encrypted_file="$1"
# Define our bail out function
error() {
# Log to stderr
echo "ERROR: $1" 1>&2
# Remove our cleartext files, just in case the trap misses them somehow
rm -f "$cleartext_file" "$cleartext_file".gpg
# Exit non-zero to note the error condition
exit 1
}
if ! which gpg >/dev/null 2>&1; then
echo "ERROR: gpg not found, hint..." 1>&2
echo " sudo apt-get install gnupg" 2>&1
exit 1
fi
# Try to decrypt the target file
if [ -e "$encrypted_file" ]; then
rm -f "$cleartext_file"
gpg -o "$cleartext_file" -d "$encrypted_file" || error "Unable to decrypt target"
fi
# Grab a checksum of the cleartext data before modification
before=$(sha512sum "$cleartext_file")
# Open the target cleartext file in your editor of choice
# It's up to this editor to save the file, if edited
sensible-editor "$cleartext_file" || error "Unable to edit target"
# Calculate a checksum afterward, to dectect modification
after=$(sha512sum "$cleartext_file")
if [ "$before" != "$after" ]; then
# File was modified, so we need to re-encrypt and overwrite our previous file
run-one-until-success gpg --default-recipient-self -s -e "$cleartext_file" || error "Unable to re-encrypt target"
cat "$cleartext_file".gpg > "$1" || error "Unable to write new encrypted file"
echo
echo "Successfully encrypted update file [$encrypted_file]"
else
# File was not modified, so do not re-encrypt/overwrite
echo
echo "The encrypted file was not modified [$encrypted_file]"
fi
rm -f "$cleartext_file" "$cleartext_file".gpg