#!/bin/bash

# Copyright (c) 2008 Jonathan McDowell <noodles@earth.li>
# GNU GPL; v2 or later
# Adds a new key to a keyring directory

set -e

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

# avoid gnupg touching ~/.gnupg
GNUPGHOME=$(mktemp -d -t jetring.XXXXXXXX)
export GNUPGHOME
trap cleanup exit
cleanup () {
	rm -rf "$GNUPGHOME"
}

if echo -n "$1" | egrep -q '^[[:xdigit:]]{40}$'; then
    fpr=$1
    keyserver=${KEYSERVER:=pool.sks-keyservers.net}
    keyfile=$(mktemp -p $GNUPGHOME newkyXXXXXX)
    echo "Retrieving key $fpr from keyserver $keyserver"
    gpg --keyserver $keyserver --recv-key "$fpr"
    gpg --export "$fpr" > $keyfile
else
    keyfile=$(readlink -f "$1") # gpg works better with absolute keyring paths
fi
keydir="$2"

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

if [ -f $keyfile ]; then
	keyid=$(gpg --with-colons --keyid long --options /dev/null --no-auto-check-trustdb < $keyfile | grep '^pub' | cut -d : -f 5)
else
	keyid=${1: -16:16}
fi

for keyring in *-pgp/ *-gpg/; do
	if [ -e $keyring/0x$keyid ]; then
		echo "0x$keyid already exists in $keyring - existing key or error."
		exit 1
	fi
done

# Check we have our keyrings available for checking the signatures
if [ ! -e output/keyrings/debian-keyring.gpg ]; then
	make
fi

if [ -f $keyfile ]; then
	gpg --quiet --import $keyfile
else
	gpg --quiet --keyserver the.earth.li --recv-key $1 || true
	gpg --quiet --keyserver pgp.mit.edu --recv-key $1 || true
	gpg --quiet --keyserver keyserver.ubuntu.com --recv-key $1 || true
	gpg --quiet --keyserver the.earth.li --send-key $1
fi
gpg --keyring output/keyrings/debian-keyring.gpg \
        --keyring output/keyrings/debian-nonupload.gpg --check-sigs \
        --with-fingerprint --keyid-format 0xlong 0x$keyid | \
sensible-pager

echo "We want signatures from at least two other DDs."
echo "If this is a key transition, we also want a signature from the DD's old key."
echo "Are you sure you want to update this key? (y/n)"
read n

if ( echo $keydir | egrep -q '^(\./)?debian-keyring-gpg/?$' ); then
    dest=DD
elif ( echo $keydir | egrep -q '^(\./)?debian-nonupload-gpg/?$' ); then
    dest=DN
elif ( echo $keydir | egrep -q '^(\./)?debian-maintainers-gpg/?$' ); then
    dest=DM
fi

if [ "x$n" = "xy" -o "x$n" = "xY" ]; then
	gpg --no-auto-check-trustdb --options /dev/null \
		--keyring output/keyrings/debian-keyring.gpg \
		--keyring output/keyrings/debian-nonupload.gpg \
		--keyring output/keyrings/debian-maintainers.gpg \
		--export-options export-clean,no-export-attributes \
		--export $keyid > $keydir/0x$keyid
	git add $keydir/0x$keyid
	echo -n "Enter full name of new key: "
	read name
	echo -n 'RT issue ID this change closes, if any: '
	read rtid
	if [ "$dest" = DD -o "$dest" = DN ]; then
		echo -n "Enter Debian login of new key: "
		read login
		echo "0x$keyid $name <$login>" >> keyids
		sort keyids > keyids.$$ && mv keyids.$$ keyids
		git add keyids
	fi

	log="Add new $dest key 0x${fpr:24:16} ($name) (RT #$rtid)"
	VERSION=$(head -1 debian/changelog | awk '{print $2}' | sed 's/[\(\)]//g')
	RELEASE=$(head -1 debian/changelog | awk '{print $3}' | sed 's/;$//')
	case $RELEASE in
            UNRELEASED)
		dch  --multimaint-merge -D UNRELEASED -a "$log"
		;;
            unstable)
		NEWVER=$(date +%Y.%m.xx)
		if [ "$VERSION" = "$NEWVER" ]
		then
                    echo '* Warning: New version and previous released version are'
                    echo "  the same: $VERSION. This should not be so!"
                    echo '  Check debian/changelog'
		fi
		dch -D UNRELEASED -v $NEWVER "$log"
		;;
            *)
		echo "Last release $VERSION for unknown distribution «$RELEASE»."
		echo "Not calling dch, do it manually."
		;;
	esac
	git add debian/changelog

	cat > git-commit-template <<EOF
$log

Action: add
Subject: $name
Username: $login
Role: $dest
Key: $fpr
Key-type: 
RT-Ticket: $rtid
Request-signed-by: 
Key-certified-by: 
Details: 
EOF

else
	echo "Not adding key."
        exit 1
fi