Set a customised background image for the microblog

src/freedombone

 MICROBLOG_THEME_REPO="https://git.gnu.io/h2p/Qvitter.git"
 MICROBLOG_THEME_COMMIT='8abbdeb3c0a6a34754411452ae832d2f19cef7ab'
 MICROBLOG_WELCOME_MESSAGE=$'<h1>Welcome to $MICROBLOG_DOMAIN_NAME – a federated microblog</h1><p>Another Freedombone site</p>'
+MICROBLOG_BACKGROUND_IMAGE_URL=
 
 # Domain name for hubzilla installation
 HUBZILLA_DOMAIN_NAME=
         if [[ $CONFIGURATION_FILE != "/root/${PROJECT_NAME}.cfg" ]]; then
             cp $CONFIGURATION_FILE /root/${PROJECT_NAME}.cfg
         fi
+        if grep -q "MICROBLOG_BACKGROUND_IMAGE_URL" $CONFIGURATION_FILE; then
+            MICROBLOG_BACKGROUND_IMAGE_URL=$(grep "MICROBLOG_BACKGROUND_IMAGE_URL" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
+        fi
         if grep -q "MICROBLOG_WELCOME_MESSAGE" $CONFIGURATION_FILE; then
             MICROBLOG_WELCOME_MESSAGE=$(grep "MICROBLOG_WELCOME_MESSAGE" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
         fi
         return
     fi
 
+    apt-get -y install wget
+
     if [ ! -d /var/www/$MICROBLOG_DOMAIN_NAME/htdocs/local/plugins ]; then
         mkdir -p /var/www/$MICROBLOG_DOMAIN_NAME/htdocs/local/plugins
     fi
     cd /var/www/$MICROBLOG_DOMAIN_NAME/htdocs/local/plugins/Qvitter
     git checkout $MICROBLOG_THEME_COMMIT -b $MICROBLOG_THEME_COMMIT
 
+    # download a custom background image
+    if [ $MICROBLOG_BACKGROUND_IMAGE_URL ]; then
+        MICROBLOG_BACKGROUND_IMAGE_URL_EXT=$(echo $MICROBLOG_BACKGROUND_IMAGE_URL | awk -F '.' '{print $2}')
+        wget $MICROBLOG_BACKGROUND_IMAGE_URL -o img/custom.${MICROBLOG_BACKGROUND_IMAGE_URL_EXT}
+        if [ ! -f img/custom.${MICROBLOG_BACKGROUND_IMAGE_URL_EXT} ]; then
+            echo "$MICROBLOG_BACKGROUND_IMAGE_URL"
+            echo $'Custom background image for microblog could not be downloaded'
+            exit 87524
+        fi
+    fi
+
     microblog_config_file=/var/www/$MICROBLOG_DOMAIN_NAME/htdocs/config.php
     if ! grep -q "addPlugin('Qvitter')" $microblog_config_file; then
         MICROBLOG_WELCOME_MESSAGE=$(echo $MICROBLOG_WELCOME_MESSAGE | sed "s|\$MICROBLOG_DOMAIN_NAME|$MICROBLOG_DOMAIN_NAME|g")
         echo "\$config['site']['qvitter']['timebetweenpolling'] = 120000; // two minutes" >> $microblog_config_file
         echo "\$config['site']['qvitter']['urlshortenerapiurl'] = 'http://qttr.at/shortener.php';" >> $microblog_config_file
         echo "\$config['site']['qvitter']['urlshortenersignature'] = 'b6afeec983';" >> $microblog_config_file
-        echo "\$config['site']['qvitter']['sitebackground'] = 'img/vagnsmossen.jpg';" >> $microblog_config_file
+        if [ $MICROBLOG_BACKGROUND_IMAGE_URL ]; then
+            echo "\$config['site']['qvitter']['sitebackground'] = 'img/custom.${MICROBLOG_BACKGROUND_IMAGE_URL_EXT}';" >> $microblog_config_file
+        else
+            echo "\$config['site']['qvitter']['sitebackground'] = 'img/vagnsmossen.jpg';" >> $microblog_config_file
+        fi
         echo "\$config['site']['qvitter']['favicon'] = 'img/favicon.ico?v=4';" >> $microblog_config_file
         echo "\$config['site']['qvitter']['sprite'] = Plugin::staticPath('Qvitter', '').'img/sprite.png?v=40';" >> $microblog_config_file
         echo "\$config['site']['qvitter']['enablewelcometext'] = true;" >> $microblog_config_file
         echo "\$config['site']['qvitter']['customwelcometext']['fr'] = '$MICROBLOG_WELCOME_MESSAGE';" >> $microblog_config_file
         echo "\$config['site']['qvitter']['customwelcometext']['es'] = '$MICROBLOG_WELCOME_MESSAGE';" >> $microblog_config_file
         echo "\$config['site']['qvitter']['blocked_ips'] = array();" >> $microblog_config_file
+    else
+        if [ -f img/custom.${MICROBLOG_BACKGROUND_IMAGE_URL_EXT} ]; then
+            sed -i "s|\$config['site']['qvitter']['sitebackground'].*|\$config['site']['qvitter']['sitebackground'] = 'img/custom.${MICROBLOG_BACKGROUND_IMAGE_URL_EXT}';|g" $microblog_config_file
+        fi
     fi
 
     if ! grep -q "GNU Social theme commit" $COMPLETION_FILE; then

src/freedombone-config

 MICROBLOG_DOMAIN_NAME=
 MICROBLOG_CODE=
 MICROBLOG_WELCOME_MESSAGE=$"<h1>Welcome to \$MICROBLOG_DOMAIN_NAME – a federated microblog</h1><p>Another $PROJECT_NAME site</p>"
+MICROBLOG_BACKGROUND_IMAGE_URL=
 GIT_DOMAIN_NAME=
 GIT_CODE=
 MEDIAGOBLIN_DOMAIN_NAME=
     if [ $MICROBLOG_WELCOME_MESSAGE ]; then
         echo "MICROBLOG_WELCOME_MESSAGE=$MICROBLOG_WELCOME_MESSAGE" >> $CONFIGURATION_FILE
     fi
+    if [ $MICROBLOG_BACKGROUND_IMAGE_URL ]; then
+        echo "MICROBLOG_BACKGROUND_IMAGE_URL=$MICROBLOG_BACKGROUND_IMAGE_URL" >> $CONFIGURATION_FILE
+    fi
     if [ $GIT_DOMAIN_NAME ]; then
         echo "GIT_DOMAIN_NAME=$GIT_DOMAIN_NAME" >> $CONFIGURATION_FILE
     fi
                 if [[ $DDNS_PROVIDER == "default@freedns.afraid.org" ]]; then
                     dialog --backtitle $"Freedombone Configuration" \
                            --title $"Microblog Configuration" \
-                           --form $"\nPlease enter your Microblog details\n\nIMPORTANT: This should be a domain name which is supported by Let's Encrypt:" 14 65 3 \
-                           $"Domain:" 1 1 "$(grep 'MICROBLOG_DOMAIN_NAME' temp.cfg | awk -F '=' '{print $2}')" 1 20 25 30 \
-                           $"Welcome Message:" 2 1 "$(grep '$MICROBLOG_WELCOME_MESSAGE' temp.cfg | awk -F '=' '{print $2}')" 3 20 50 30 \
-                           $"Code:" 3 1 "$(grep 'MICROBLOG_CODE' temp.cfg | awk -F '=' '{print $2}')" 2 20 25 30 \
+                           --form $"\nPlease enter your Microblog details. Welcome message and background image URL can be left blank.\n\nIMPORTANT: This should be a domain name which is supported by Let's Encrypt:" 16 65 4 \
+                           $"Domain:" 1 1 "$(grep 'MICROBLOG_DOMAIN_NAME' temp.cfg | awk -F '=' '{print $2}')" 1 25 25 30 \
+                           $"Welcome Message:" 2 1 "$(grep '$MICROBLOG_WELCOME_MESSAGE' temp.cfg | awk -F '=' '{print $2}')" 2 25 255 30 \
+                           $"Background image URL:" 3 1 "$(grep '$MICROBLOG_BACKGROUND_IMAGE_URL' temp.cfg | awk -F '=' '{print $2}')" 3 25 255 30 \
+                           $"Code:" 4 1 "$(grep 'MICROBLOG_CODE' temp.cfg | awk -F '=' '{print $2}')" 4 25 25 30 \
                            2> $data
                 else
                     dialog --backtitle $"Freedombone Configuration" \
                            --title $"Microblog Configuration" \
-                           --form $"\nPlease enter your Microblog details\n\nIMPORTANT: This should be a domain name which is supported by Let's Encrypt:" 13 65 3 \
-                           $"Domain:" 1 1 "$(grep 'MICROBLOG_DOMAIN_NAME' temp.cfg | awk -F '=' '{print $2}')" 1 20 25 30 \
-                           $"Welcome Message:" 2 1 "$(grep '$MICROBLOG_WELCOME_MESSAGE' temp.cfg | awk -F '=' '{print $2}')" 2 20 50 30 \
+                           --form $"\nPlease enter your Microblog details. Welcome message and background image URL can be left blank.\n\nIMPORTANT: This should be a domain name which is supported by Let's Encrypt:" 16 65 4 \
+                           $"Domain:" 1 1 "$(grep 'MICROBLOG_DOMAIN_NAME' temp.cfg | awk -F '=' '{print $2}')" 1 25 25 30 \
+                           $"Welcome Message:" 2 1 "$(grep '$MICROBLOG_WELCOME_MESSAGE' temp.cfg | awk -F '=' '{print $2}')" 2 25 255 30 \
+                           $"Background image URL:" 3 1 "$(grep '$MICROBLOG_BACKGROUND_IMAGE_URL' temp.cfg | awk -F '=' '{print $2}')" 3 25 255 30 \
                            2> $data
                 fi
                 sel=$?
                 if [ ${#welcome_msg} -gt 1 ]; then
                     MICROBLOG_WELCOME_MESSAGE=$welcome_msg
                 fi
+				img_url=$(cat $data | sed -n 3p)
+                if [ ${#img_url} -gt 1 ]; then
+                    MICROBLOG_BACKGROUND_IMAGE_URL=$img_url
+                fi
                 if [ $MICROBLOG_DOMAIN_NAME ]; then
                     if [[ $MICROBLOG_DOMAIN_NAME == "$HUBZILLA_DOMAIN_NAME" ]]; then
                         MICROBLOG_DOMAIN_NAME=""
                         dialog --title $"Domain name validation" --msgbox "$TEST_DOMAIN_NAME" 15 50
                     else
                         if [[ $DDNS_PROVIDER == "default@freedns.afraid.org" ]]; then
-                            MICROBLOG_CODE=$(cat $data | sed -n 3p)
+                            MICROBLOG_CODE=$(cat $data | sed -n 4p)
                             if [ ${#MICROBLOG_CODE} -lt 30 ]; then
                                 MICROBLOG_DOMAIN_NAME=
                                 dialog --title $"FreeDNS code" --msgbox "$FREEDNS_MESSAGE" 15 50
         if grep -q "MICROBLOG_WELCOME_MESSAGE" $CONFIGURATION_FILE; then
             MICROBLOG_WELCOME_MESSAGE=$(grep "MICROBLOG_WELCOME_MESSAGE" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
         fi
+        if grep -q "MICROBLOG_BACKGROUND_IMAGE_URL" $CONFIGURATION_FILE; then
+            MICROBLOG_BACKGROUND_IMAGE_URL=$(grep "MICROBLOG_BACKGROUND_IMAGE_URL" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
+        fi
         if grep -q "HUBZILLA_DOMAIN_NAME" $CONFIGURATION_FILE; then
             HUBZILLA_DOMAIN_NAME=$(grep "HUBZILLA_DOMAIN_NAME" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
         fi