Simplify install state checking

src/freedombone-app-babel

 }
 
 function install_babel {
-    if [[ $(app_is_installed babel) == "1" ]]; then
-        return
-    fi
     if [[ $ENABLE_BABEL != "yes" ]]; then
         return
     fi
 
     function_check configure_firewall_for_babel
     configure_firewall_for_babel
-    install_completed babel
 }
 
 # NOTE: deliberately there is no "exit 0"

src/freedombone-app-batman

         mesh_install_batman
         return
     fi
-    if [[ $(app_is_installed batman) == "1" ]]; then
-        return
-    fi
     if [[ $ENABLE_BATMAN != "yes" ]]; then
         return
     fi
 
     function_check configure_firewall_for_batman
     configure_firewall_for_batman
-    install_completed batman
 }
 
 # NOTE: deliberately no exit 0

src/freedombone-app-blog

 }
 
 function install_blog {
-    if [[ $(app_is_installed blog) == "1" ]]; then
-        return
-    fi
-
     if [ ! $ONION_ONLY ]; then
         ONION_ONLY='no'
     fi
     if ! grep -q "Blog domain:" $COMPLETION_FILE; then
         echo "Blog domain:$FULLBLOG_DOMAIN_NAME" >> $COMPLETION_FILE
     fi
-
-    install_completed blog
 }
 
 # NOTE: deliberately no exit 0

src/freedombone-app-blogstatic

         return
     fi
 
-    if [[ $(app_is_installed blogstatic) == "1" ]]; then
-        return
-    fi
-
     apt-get -y install python-pip
     pip install ipython
     pip install Markdown
 
     chown -R $MY_USERNAME:$MY_USERNAME $STATIC_BLOG_INSTALL_DIR
     chown -R www-data:www-data $STATIC_BLOG_PATH
-
-    install_completed blogstatic
 }
 
 # NOTE: deliberately no exit 0

src/freedombone-app-cjdns

     # initialise from the cjdns config
     /usr/bin/cjdcmd cjdnsadmin -file /etc/cjdns/cjdroute.conf
 
-    echo 'install_cjdns_tools' >> $COMPLETION_FILE
+    install_completed cjdns_tools
 }
 
 function install_cjdns {
-    if [[ $(app_is_installed cjdns) == "1" ]]; then
-        return
-    fi
     install_cjdns_main
     install_cjdns_tools
     install_completed cjdns

src/freedombone-app-dlna

 }
 
 function install_dlna {
-    if [[ $(app_is_installed dlna) == "1" ]]; then
-        return
-    fi
     install_dlna_main
     script_for_attaching_usb_drive
-    install_completed dlna
 }
 
 # NOTE: deliberately no exit 0

src/freedombone-app-emacs

 }
 
 function install_emacs {
-    if [[ $(app_is_installed emacs) == "1" ]]; then
-        return
-    fi
     update-alternatives --set editor /usr/bin/emacs24
 
     # A minimal emacs configuration
     echo '(epa-file-enable)' >> /home/$MY_USERNAME/.emacs
     cp /home/$MY_USERNAME/.emacs /root/.emacs
     chown $MY_USERNAME:$MY_USERNAME /home/$MY_USERNAME/.emacs
-
-    install_completed emacs
 }
 
 # NOTE: deliberately no exit 0

src/freedombone-app-gnusocial

 }
 
 function install_gnusocial {
-    if [[ $(app_is_installed gnusocial) == "1" ]]; then
-        return
-    fi
-
     if [ ! $ONION_ONLY ]; then
         ONION_ONLY='no'
     fi
     install_gnusocial_plugin_sharings
     install_gnusocial_plugin_sharings_theme
     install_gnusocial_plugin_nsfw
-    install_completed gnusocial
 }
 
 # NOTE: deliberately there is no "exit 0"

src/freedombone-app-gogs

         return
     fi
 
-    if [[ $(app_is_installed gogs) == "1" ]]; then
-        return
-    fi
-
     adduser --disabled-login --gecos 'Gogs' $GOGS_USERNAME
 
     gogs_parameters
     else
         sed -i "s|Gogs version.*|Gogs version:$GOGS_VERSION|g" $COMPLETION_FILE
     fi
-    install_completed gogs
 }
 
 # NOTE: deliberately no exit 0

src/freedombone-app-hubzilla

         return
     fi
 
-    if [[ $(app_is_installed hubzilla) == "1" ]]; then
-        return
-    fi
-
     HUBZILLA_PATH=/var/www/$HUBZILLA_DOMAIN_NAME/htdocs
 
     function_check install_mariadb
     ${PROJECT_NAME}-addemail -u $MY_USERNAME -e "noreply@$HUBZILLA_DOMAIN_NAME" -g hubzilla --public no
 
     echo "Hubzilla domain:${HUBZILLA_DOMAIN_NAME}" >> $COMPLETION_FILE
-    install_completed hubzilla
 }
 
 # NOTE: deliberately there is no "exit 0"

src/freedombone-app-irc

 }
 
 function install_irc {
-    if [[ $(app_is_installed irc) == "1" ]]; then
-        return
-    fi
     install_irc_server
     install_irc_client
-    install_completed irc
 }
 
 # NOTE: deliberately no exit 0

src/freedombone-app-librevault

         return
     fi
 
-    if [[ $(app_is_installed librevault) == "1" ]]; then
-        return
-    fi
-
     install_tracker
     install_cmake
     install_cryptopp
 
     systemctl enable librevault-daemon
     systemctl start librevault-daemon
-
-    install_completed librevault
 }
 
 # NOTE: deliberately no exit 0

src/freedombone-app-mediagoblin

 }
 
 function upgrade_mediagoblin {
-    echo -n ''
+    if [ ! $ONION_ONLY ]; then
+        ONION_ONLY='no'
+    fi
+    if grep -q "ONION_ONLY" $CONFIGURATION_FILE; then
+        ONION_ONLY=$(grep "ONION_ONLY" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
+    fi
+    if grep -q "MEDIAGOBLIN_DOMAIN_NAME" $CONFIGURATION_FILE; then
+        MEDIAGOBLIN_DOMAIN_NAME=$(grep "MEDIAGOBLIN_DOMAIN_NAME" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
+    fi
+    if grep -q "MEDIAGOBLIN_CODE" $CONFIGURATION_FILE; then
+        MEDIAGOBLIN_CODE=$(grep "MEDIAGOBLIN_CODE" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
+    fi
+    if grep -q "DDNS_PROVIDER" $CONFIGURATION_FILE; then
+        DDNS_PROVIDER=$(grep "DDNS_PROVIDER" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
+    fi
+
+    if [ ! $MEDIAGOBLIN_DOMAIN_NAME ]; then
+        return
+    fi
+
+    MEDIAGOBLIN_WORKING_DIRECTORY=/var/www/$MEDIAGOBLIN_DOMAIN_NAME/htdocs
+
+    # update to a new commit if needed
+    function_check set_repo_commit
+    set_repo_commit $MEDIAGOBLIN_WORKING_DIRECTORY "Mediagoblin commit" "$MEDIAGOBLIN_COMMIT" $MEDIAGOBLIN_REPO
+    if [ -d $MEDIAGOBLIN_WORKING_DIRECTORY ]; then
+        chown -hR mediagoblin:www-data $MEDIAGOBLIN_WORKING_DIRECTORY
+    fi
 }
 
 function backup_local_mediagoblin {
         chown -hR mediagoblin:www-data $MEDIAGOBLIN_WORKING_DIRECTORY
     fi
 
-    if [[ $(app_is_installed mediagoblin) == "1" ]]; then
-        return
-    fi
-
     apt-get -y install git-core python python-dev python-lxml python-pil
     apt-get -y install python-virtualenv npm nodejs-legacy automake
     apt-get -y install fcgiwrap
     else
         sed -i "s/Mediagoblin domain.*/Mediagoblin domain:$MEDIAGOBLIN_DOMAIN_NAME/g" $COMPLETION_FILE
     fi
-
-    install_completed mediagoblin
 }
 
 # NOTE: deliberately no exit 0

src/freedombone-app-mumble

 }
 
 function install_mumble {
-    if [[ $(app_is_installed mumble) == "1" ]]; then
-        return
-    fi
     apt-get -y install mumble-server
 
     function_check get_voip_server_password
 
     function_check configure_firewall_for_voip
     configure_firewall_for_voip
-    install_completed mumble
 }
 
 # NOTE: deliberately no exit 0

src/freedombone-app-rss

 }
 
 function install_rss {
-    if [[ $(app_is_installed rss) == "1" ]]; then
-        return
-    fi
     install_rss_main
     install_rss_gnusocial
     install_rss_mobile_reader
-    install_completed rss
 }
 
 # NOTE: deliberately no exit 0

src/freedombone-app-searx

         exit 62429
     fi
 
-    if [[ $(app_is_installed searx) == "1" ]]; then
-        return
-    fi
-
     apt-get -y install python-pip libyaml-dev python-werkzeug python-babel python-lxml apache2-utils
     apt-get -y install git build-essential libxslt-dev python-dev python-virtualenv python-pybabel zlib1g-dev uwsgi uwsgi-plugin-python libapache2-mod-uwsgi
 
         chown $MY_USERNAME:$MY_USERNAME /home/$MY_USERNAME/README
         chmod 600 /home/$MY_USERNAME/README
     fi
-
-    install_completed searx
 }
 
 # NOTE: deliberately no exit 0

src/freedombone-app-sip

 }
 
 function install_sip {
-    if [[ $(app_is_installed sip) == "1" ]]; then
-        return
-    fi
     install_sip_main
     update_sipwitch_daemon
-    install_completed sip
 }
 
 # NOTE: deliberately no exit 0

src/freedombone-app-syncthing

         return
     fi
 
-    if [[ $(app_is_installed syncthing) == "1" ]]; then
-        return
-    fi
-
     apt-get -y install curl
 
     curl -s https://syncthing.net/release-key.txt | apt-key add -
 
     function_check configure_firewall_for_syncthing
     configure_firewall_for_syncthing
-    install_completed syncthing
 }
 
 # NOTE: deliberately no exit 0

src/freedombone-app-tahoelafs

         return
     fi
 
-    if [[ $(app_is_installed tahoelafs) == "1" ]]; then
-        return
-    fi
-
     apt-get -y install build-essential python-pip python-dev libffi-dev libssl-dev python-virtualenv
 
     # create a user to run the introducer
     systemctl enable tahoelafs
     systemctl daemon-reload
     systemctl start tahoelafs
-
-    install_completed tahoelafs
 }
 
 # NOTE: deliberately no exit 0

src/freedombone-app-tox

 }
 
 function install_tox {
-    if [ ! $INSTALLING_MESH ]; then
-        if [[ $(app_is_installed tox) == "1" ]]; then
-            return
-        fi
-    fi
-
     configure_firewall_for_tox
 
     if [ $INSTALLING_MESH ]; then
         tox_avahi
         install_tox_client
     fi
-
-    install_completed tox
 }
 
 # NOTE: deliberately no exit 0

src/freedombone-app-vpn

 }
 
 function install_vpn {
-    if [[ $(app_is_installed vpn) == "1" ]]; then
-        return
-    fi
     if ! grep -q "repo.universe-factory.net" /etc/apt/sources.list; then
         echo 'deb http://repo.universe-factory.net/debian/ sid main' >> /etc/apt/sources.list
         gpg --keyserver pgpkeys.mit.edu --recv-key 16EF3F64CB201D9C
             exit 52026
         fi
     fi
-    install_completed vpn
 }
 
 # NOTE: deliberately there is no "exit 0"

src/freedombone-app-webmail

 }
 
 function install_webmail {
-    if [[ $(app_is_installed webmail) == "1" ]]; then
-        return
-    fi
     if [ -d /etc/apache2 ]; then
         rm -rf /etc/apache2
         echo $'Removed Apache installation after Dokuwiki install'
         chown $MY_USERNAME:$MY_USERNAME /home/$MY_USERNAME/README
         chmod 600 /home/$MY_USERNAME/README
     fi
-
-    install_completed webmail
 }
 
 # NOTE: deliberately no exit 0

src/freedombone-app-wiki

 }
 
 function install_wiki {
-    if [[ $(app_is_installed wiki) == "1" ]]; then
-        return
-    fi
-
     if [ ! $ONION_ONLY ]; then
         ONION_ONLY='no'
     fi
     fi
 
     echo "Wiki domain:$WIKI_DOMAIN_NAME" >> $COMPLETION_FILE
-    install_completed wiki
 }
 
 # NOTE: deliberately no exit 0

src/freedombone-app-xmpp

 }
 
 function install_xmpp {
-    if [[ $(app_is_installed xmpp) == "1" ]]; then
-        return
-    fi
     install_xmpp_main
     install_xmpp_client
-    install_completed xmpp
 }
 
 # NOTE: deliberately no exit 0

src/freedombone-app-zeronet

         mesh_zeronet_forum
         return
     fi
-    if [[ $(app_is_installed zeronet) == "1" ]]; then
-        return
-    fi
     install_zeronet_main
     install_zeronet_blog
     install_zeronet_mail
     install_zeronet_forum
-    install_completed zeronet
 }
 
 # NOTE: deliberately no exit 0

src/freedombone-utils-selector

                     # clears any removal indicator
                     reinstall_app ${a}
 
-                    echo $"Installing application from interactive: ${a}"
-                    install_${a}
-                    echo $"${a} was installed from interactive"
+                    if [[ $(app_is_installed ${a}) == "1" ]]; then
+                        echo $"Upgrading application from interactive: ${a}"
+                        upgrade_${a}
+                        echo $"${a} was upgraded from interactive"
+                    else
+                        echo $"Installing application from interactive: ${a}"
+                        install_${a}
+                        install_completed ${a}
+                        echo $"${a} was installed from interactive"
+                    fi
                 else
                     # check if the app was removed
                     if [[ $(app_is_removed ${a}) == "0" ]]; then
-                        echo $"Installing application: ${a}"
-                        install_${a}
-                        echo $"${a} was installed"
+                        if [[ $(app_is_installed ${a}) == "1" ]]; then
+                            echo $"Upgrading application: ${a}"
+                            upgrade_${a}
+                            echo $"${a} was upgraded"
+                        else
+                            echo $"Installing application: ${a}"
+                            install_${a}
+                            install_completed ${a}
+                            echo $"${a} was installed"
+                        fi
                     else
                         echo $"${a} has been removed and so will not be reinstalled"
                     fi