Add an upgrade shell script for Gitea

upgrade.sh

@@ -0,0 +1,71 @@
+#!/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