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Edit File

#!/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