#!/bin/sh

# Copyright (c) 2008 Jonathan McDowell <noodles@earth.li>
# GNU GPL; v2 or later
# Updates an existing key in a keyring dir

set -e

if [ "x$1" = "x--no-clean" ]; then
	NOCLEAN=1
	shift
else
	NOCLEAN=0
fi


if [ -z "$1" ] || [ -z "$2" ]; then
	echo "Usage: update-key keyfile dir" >&2
	exit 1
fi

# avoid gnupg touching ~/.gnupg
GNUPGHOME=$(mktemp -d -t jetring.XXXXXXXX)
export GNUPGHOME
cat > "$GNUPGHOME"/gpg.conf <<EOF
keyid-format 0xlong
no-auto-check-trustdb
no-autostart
EOF

if [ "$NOCLEAN" = "0" ]; then
	echo "import-options import-clean" >> "$GNUPGHOME"/gpg.conf
	echo "export-options export-clean,no-export-attributes" >> "$GNUPGHOME"/gpg.conf
	cat output/keyrings/debian-keyring.gpg \
		output/keyrings/debian-nonupload.gpg \
		output/keyrings/debian-maintainers.gpg > $GNUPGHOME/pubring.gpg
fi

trap cleanup exit
cleanup () {
	rm -rf "$GNUPGHOME"
}

keyfile=$(readlink -f "$1") # gpg works better with absolute keyring paths
keydir="$2"

basename=$(basename "$keyfile")
date=`date -R`

keyid=$(gpg --quiet --with-colons < $keyfile | grep '^pub' | head -n 1 | cut -d : -f 5)
name=$(gpg --quiet --with-colons < $keyfile | grep '^uid' | head -n 1 | cut -d : -f 10 | sed -e 's/ <.*//')

if [ ! -e $keydir/0x$keyid ]; then
	echo "0x$keyid isn't already in $keydir - new key or error."
	exit 1
fi

gpg --quiet --import $keydir/0x$keyid
summary=$(gpg --import $keyfile 2>&1 | \
		scripts/parse-gpg-update 0x$keyid "$name")
gpg --export $keyid > $GNUPGHOME/0x$keyid

case "$summary" in
  *:*)
	# Something changed
	;;
  *)
	# Nothing changed, exit
	echo "No changes to $summary"
	exit
esac

if cmp -s $GNUPGHOME/0x$keyid $keydir/0x$keyid; then
	echo "No changes to 0x$keyid"
	exit
fi

n='a'
while [ "x$n" = "xa" -o "x$n" = "xA" ]; do
    echo "Running gpg-diff:"
    (
	echo $summary 
	echo
	scripts/gpg-diff $keydir/0x$keyid $GNUPGHOME/0x$keyid
    ) | sensible-pager

    echo "Are you sure you want to update this key? (y/n/a: Yes/No/Again)"
    read n
done

if [ "x$n" = "xy" -o "x$n" = "xY" ]; then
	mv $GNUPGHOME/0x$keyid $keydir/0x$keyid
	git add $keydir/0x$keyid
	echo "Updated key."
	echo $summary >> update.log
else
	echo "Not updating key."
fi