Handle Gitea version upgrade in pretemplate script

Check for version update with script expected version versus installed
version

pretemplate/01-gitea-init

@@ -21,76 +21,115 @@ APPNAME="gitea"
 APPBINARY="gitea"
 APPSIG="7C9E68152594688862D62AF62D9AE806EC1592E2"
 APPASC="${APPNAME}-${APPVERSION}-${OS}-${ARCH}.asc"
-KEYSERV="pgp.mit.edu"
+KEYSERV="hkp://p80.pool.sks-keyservers.net:80"
 DLSERV="dl.gitea.io"
 APPDIR="${WKDIR}/gitea"
 APPBINDIR="${APPDIR}/bin"
 APPCONFDIR="/etc/${APPNAME}"
 
-if [[ -d ${APPCONFDIR} ]]
-then
-   exit 0
-fi
-
-proxy=$(CreoleGet activer_proxy_client non)
-
-if [[ ${proxy} == "oui" ]]
-then
+function configure_proxy {
+   proxy=$(CreoleGet activer_proxy_client non)
+   if [[ ${proxy} == "oui" ]]
+   then
       prAddr=$(CreoleGet proxy_client_adresse)
       prPort=$(CreoleGet proxy_client_port)
       export HTTP_PROXY=http://${prAddr}:${prPort}
       export http_proxy=http://${prAddr}:${prPort}
       export HTTPS_PROXY=http://${prAddr}:${prPort}
       export https_proxy=http://${prAddr}:${prPort}
-fi
+   fi
+}
 
-if [[ ! -d ${APPDIR} ]] 
-then
-   mkdir -p ${APPDIR}
-   chown ${USER}:${GROUP} ${APPDIR} -R
-fi
+function create_app_dir {
    
-# Create app user and group
-groupadd ${GROUP}
-adduser \
+   mkdir -p "${APPDIR}"
+   chown ${USER}:${GROUP} "${APPDIR}" -R
+
+   # Create app structure
+   mkdir -p ${APPDIR}/{custom,data,indexers,public,log}
+   chown ${USER}:${GROUP} ${APPDIR}/{data,indexers,log}
+   chmod 750 ${APPDIR}/{data,indexers,log}
+   mkdir -p "${APPCONFDIR}"
+   chown root:${GROUP} ${APPCONFDIR}
+   chmod 770 "${APPCONFDIR}"
+
+   mkdir -p "${APPBINDIR}"
+   chown ${USER}:${GROUP} "${APPBINDIR}"
+
+}
+
+function create_user_and_group {
+   local existing_group=$(getent group ${GROUP})
+   if [ -z "${existing_group}" ]; then
+      groupadd ${GROUP}
+   fi
+
+   local existing_user=$(getent passwd ${USER})
+   if [ -z "${existing_user}" ]; then
+      adduser \
          --shell ${USERSHELL} \
          --gecos "${GECOS}" \
          --ingroup ${GROUP} \
          --disabled-password \
          --home ${HOMEDIR} \
          ${USER}
+   fi
+}
 
-# Create app structure
-mkdir -p ${APPDIR}/{custom,data,indexers,public,log}
-chown ${USER}:${GROUP} ${APPDIR}/{data,indexers,log}
-chmod 750 ${APPDIR}/{data,indexers,log}
-mkdir ${APPCONFDIR}
-chown root:${GROUP} ${APPCONFDIR}
-chmod 770 ${APPCONFDIR}
+function download_binary {
+   local temp_bin=$(mktemp)
 
-if [[ ! -d ${APPBINDIR} ]]
-then
-   mkdir -p ${APPBINDIR}
-   chown ${USER}:${GROUP} ${APPBINDIR}
-fi
-
-cd $APPBINDIR
-if [[ ! -f ${APPBINARY} ]]
-then
-  wget -O ${APPBINARY} https://${DLSERV}/${APPNAME}/${APPVERSION}/${APPNAME}-${APPVERSION}-${OS}-${ARCH}
-  if [[ $? -eq  0 ]]
+   wget -O "${temp_bin}" https://${DLSERV}/${APPNAME}/${APPVERSION}/${APPNAME}-${APPVERSION}-${OS}-${ARCH}
+   if [[ $? -ne  0 ]]
    then
-     chmod +x ${APPBINARY}
-  else
       echo "Error downloading binary for ${APPNAME}"
       return 123
    fi
-fi
 
-if [[ ! -f ${APPASC} ]] 
-then
-   wget -O ${APPASC} https://${DLSERV}/${APPNAME}/${APPVERSION}/${APPASC}
+   wget -O "${temp_bin}.asc" https://${DLSERV}/${APPNAME}/${APPVERSION}/${APPASC}
    gpg --keyserver ${KEYSERV} --recv ${APPSIG}
-   gpg --verify ${APPNAME}-${APPVERSION}-${OS}-${ARCH}.asc ${APPBINARY}
-fi
-cd -
+   gpg --verify "${temp_bin}.asc" "${temp_bin}"
+
+   if [[ $? -ne  0 ]]
+   then
+      echo "Error downloading binary for ${APPNAME}"
+      return 123
+   fi
+
+   cd $APPBINDIR
+   chmod +x "${temp_bin}"
+   mv -f "${temp_bin}" ${APPBINARY}
+   cd -
+}
+
+function current_gitea_version {
+   if [[ ! -f "${APPBINDIR}/${APPBINARY}" ]]
+   then
+      return
+   fi
+   "${APPBINDIR}/${APPBINARY}" --version | cut -d' ' -f 3
+}
+
+function main {
+   
+   # Check that installed version if ok
+   local current_version=$(current_gitea_version)
+   if [ "$current_version" == "$APPVERSION" ]; then
+      exit 0
+   fi
+   
+   if [ -z "$current_version" ]
+   then
+      echo "Installing Gitea ${APPVERSION}..."
+   else
+      echo "Upgrade Gitea from ${current_version} to ${APPVERSION}..."
+   fi
+   
+   configure_proxy
+   create_user_and_group
+   create_app_dir
+   download_binary
+   
+}
+
+main