#!/bin/bash

#VERSION=x.x.x

BINDIR=/srv/gitea/bin
GITEA_URL='http://127.0.0.1:3000'

function err_report() {
    echo "FAILURE while executing '$1' step" 1>&2
}

function verify() {
    set -e
    current=$(wget -qO- --header="accept: application/json" "${GITEA_URL}/api/v1/version"  | jq -r .version)
    if dpkg --compare-versions $current ge $VERSION; then
        echo "Already at version $current" 1>&2
        return 1
    fi
}

function download() {
    set -ex
    wget -nv -P $BINDIR -c https://dl.gitea.io/gitea/$VERSION/gitea-$VERSION-linux-amd64
    wget -nv -qP $BINDIR -c https://dl.gitea.io/gitea/$VERSION/gitea-$VERSION-linux-amd64.asc
    wget -nv -P $BINDIR -c https://dl.gitea.io/gitea/$VERSION/gitea-$VERSION-linux-amd64.sha256
    find $BINDIR -type f -name gitea-$VERSION-linux-amd64.sha256 -exec sha256sum {} \; | sha256sum
    gpg --keyserver keys.openpgp.org --recv 7C9E68152594688862D62AF62D9AE806EC1592E2
    gpg --verify $BINDIR/gitea-$VERSION-linux-amd64.asc $BINDIR/gitea-$VERSION-linux-amd64
    set +x
}

function stop() {
    set -ex
    systemctl stop gitea
    set +x
}

function backup() {
    set -ex
    su - gitea -c "cd /srv/gitea/bin ; /srv/gitea/bin/gitea dump --tempdir /var/tmp/ -c /etc/gitea/gitea.ini"
    set +x
}

function upgrade() {
    set -ex
    chmod u+x $BINDIR/gitea-$VERSION-linux-amd64
    chown gitea.gitea $BINDIR/gitea-$VERSION-linux-amd64
    ln --force $BINDIR/gitea-$VERSION-linux-amd64 $BINDIR/gitea
    set +x
}

function start() {
    set -ex
    systemctl start gitea
    set +x
}

#Available steps: verify download stop backup upgrade start
if [[ -z "$VERSION" ]]; then
    echo "VERSION isn't defined" 1>&2
else
    set -o errtrace # otherwise trap on ERR isn't inherited by shell functions
    set -o pipefail
    for fun in ${@:-verify download} ; do
        trap "err_report $fun" ERR
        echo -e "\nExecute $fun ..."
        $fun
        echo -e "\n'$fun' step was successfully executed."
    done
    set +e
fi