#!/bin/sh
# SPDX-License-Identifier: GPL-2.0-only

# Based on apt-key from apt-0.6.25
# Licensed under GPL Version 2

set -e

usage() {
    echo "Usage: opkg-key [options] command [arguments]"
    echo
    echo "Manage opkg's list of trusted keys"
    echo
    echo "Commands and arguments:"
    echo "  add <file>          - Add the key contained in <file> ('-' for stdin)"
    echo "  del <keyid>         - Remove the key <keyid>"
    echo "  list                - List keys"
    echo "  fingerprint         - List keys with fingerprints"
    echo "  reset               - Remove all keys, resetting the keyring"
    echo "  populate            - Import keys from /usr/share/opkg/keyrings"
    echo "  help                - Print this usage message and exit"
    echo
    echo "Options:"
    echo "  -o <root>           - Use <root> as the offline root directory"
    echo
}

if [ "$1" = "-o" ]; then
  ROOT=$2
  shift 2
  echo "Note: using \"$ROOT\" as root path"
else
  ROOT=""
fi

GPGHOMEDIR="$ROOT/etc/opkg/gpg"

command="$1"
if [ -z "$command" ]; then
    usage
    exit 1
fi
shift

# For the particular use case we have in importing/trusting keys the
# differences between gpg and gpg2 are moot.
if [ -f "$(which gpg)" ]; then
    GPGCMD="gpg"
elif [ -f "$(which gpg2)" ]; then
    GPGCMD="gpg2"
else
    echo >&2 "Error: gnupg does not appear to be installed."
    exit 1
fi

GPG="$GPGCMD --no-options --homedir $GPGHOMEDIR"

# Gpg home dir isn't created automatically when --homedir option is used
if [ ! -e "$GPGHOMEDIR" ]; then
    mkdir -m 0700 "$GPGHOMEDIR"
    echo "Created gpg homedir"
fi

case "$command" in
    add)
        $GPG --quiet --batch --import "$1"
        ret=$?
        if [ $ret -eq 0 ]; then
            echo "OK"
        else
            echo "Failed"
        fi
        ;;
    del|rm|remove)
        $GPG --quiet --batch --delete-key --yes "$1"
        ret=$?
        if [ $ret -eq 0 ]; then
            echo "OK"
        else
            echo "Failed"
        fi
        ;;
    list)
        $GPG --batch --list-keys
        ;;
    finger*)
        $GPG --batch --fingerprint
        ;;
    adv*)
        echo "Executing: $GPG $*"
        $GPG $*
        ;;
    reset)
        find "$GPGHOMEDIR" ! -path "$GPGHOMEDIR/gpg.conf" ! -path "$GPGHOMEDIR" -prune -exec rm -r {} \;
        echo "OK"
        ;;
    populate)
        for f in $ROOT/usr/share/opkg/keyrings/*.gpg; do
            echo "Importing keys from '`basename $f`'..."
            $GPG --quiet --batch --import "$f"
        done
        echo "OK"
        ;;
    help)
        usage
        ;;
    *)
        usage
        exit 1
        ;;
esac