Username validation function

src/freedombone-app-blog

         fi
         for d in /home/*/ ; do
             USERNAME=$(echo "$d" | awk -F '/' '{print $3}')
-            if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+            if [[ $(is_valid_user $USERNAME) == "1" ]]; then
                 if [ -d /var/www/${FULLBLOG_DOMAIN_NAME}/htdocs/content/$USERNAME/blog/uncategorized/post ]; then
                     mv /var/www/${FULLBLOG_DOMAIN_NAME}/htdocs/content/$USERNAME/blog/*.md /var/www/${FULLBLOG_DOMAIN_NAME}/htdocs/content/$USERNAME/blog/uncategorized/post
                 fi
         fi
         for d in /home/*/ ; do
             USERNAME=$(echo "$d" | awk -F '/' '{print $3}')
-            if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+            if [[ $(is_valid_user $USERNAME) == "1" ]]; then
                 if [ -d /var/www/${FULLBLOG_DOMAIN_NAME}/htdocs/content/$USERNAME/blog/uncategorized/post ]; then
                     mv /var/www/${FULLBLOG_DOMAIN_NAME}/htdocs/content/$USERNAME/blog/*.md /var/www/${FULLBLOG_DOMAIN_NAME}/htdocs/content/$USERNAME/blog/uncategorized/post
                 fi

src/freedombone-app-emacs

 function backup_local_emacs {
     for d in /home/*/ ; do
         USERNAME=$(echo "$d" | awk -F '/' '{print $3}')
-        if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+        if [[ $(is_valid_user $USERNAME) == "1" ]]; then
             if [ -d /home/$USERNAME/.emacs.d ]; then
                 echo $"Backing up Emacs config for $USERNAME"
                 if [ -f /home/$USERNAME/.emacs ]; then
     if [ -d $USB_MOUNT/backup/emacs ]; then
         for d in $USB_MOUNT/backup/emacs/*/ ; do
             USERNAME=$(echo "$d" | awk -F '/' '{print $6}')
-            if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+            if [[ $(is_valid_user $USERNAME) == "1" ]]; then
                 if [ ! -d /home/$USERNAME ]; then
                     ${PROJECT_NAME}-adduser $USERNAME
                 fi

src/freedombone-app-irc

             # replace the password for all users
             for d in /home/*/ ; do
                 IRC_USERNAME=$(echo "$d" | awk -F '/' '{print $3}')
-                if [[ $IRC_USERNAME != "git" && $IRC_USERNAME != "mirrors" && $IRC_USERNAME != "sync" && $IRC_USERNAME != "tahoelafs" ]]; then
+                if [[ $(is_valid_user $IRC_USERNAME) == "1" ]]; then
                     if [ -f /home/$IRC_USERNAME/.irssi/config ]; then
                         sed -i "s|$EXISTING_IRC_PASSWORD|$NEW_IRC_PASSWORD|g" /home/$IRC_USERNAME/.irssi/config
                         chown -R $IRC_USERNAME:$IRC_USERNAME /home/$IRC_USERNAME/.irssi

src/freedombone-app-syncthing

     if [ -d $USB_MOUNT/backup/syncthing ]; then
         for d in $USB_MOUNT/backup/syncthing/*/ ; do
             USERNAME=$(echo "$d" | awk -F '/' '{print $6}')
-            if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+            if [[ $(is_valid_user $USERNAME) == "1" ]]; then
                 if [ ! -d /home/$USERNAME ]; then
                     ${PROJECT_NAME}-adduser $USERNAME
                 fi
     if [ -d $SERVER_DIRECTORY/backup/syncthing ]; then
         for d in $SERVER_DIRECTORY/backup/syncthing/*/ ; do
             USERNAME=$(echo "$d" | awk -F '/' '{print $6}')
-            if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+            if [[ $(is_valid_user $USERNAME) == "1" ]]; then
                 if [ ! -d /home/$USERNAME ]; then
                     ${PROJECT_NAME}-adduser $USERNAME
                 fi

src/freedombone-app-tahoelafs

 function reconfigure_tahoelafs {
     for d in /home/*/ ; do
         USERNAME=$(echo "$d" | awk -F '/' '{print $3}')
-        if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+        if [[ $(is_valid_user $USERNAME) == "1" ]]; then
             if [ -d /home/$USERNAME/.tahoe ]; then
                 su -c "$TAHOE_COMMAND stop" - $USERNAME
                 rm -rf /home/$USERNAME/.tahoe

src/freedombone-app-xmpp

 function xmpp_email_headers {
     for d in /home/*/ ; do
         USERNAME=$(echo "$d" | awk -F '/' '{print $3}')
-        if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+        if [[ $(is_valid_user $USERNAME) == "1" ]]; then
             if [ -f /home/$USERNAME/.muttrc ]; then
                 if ! grep -q "Jabber-ID" /home/$USERNAME/.muttrc; then
                     echo "my_hdr Jabber-ID: ${USERNAME}@${HOSTNAME}" >> /home/$USERNAME/.muttrc

src/freedombone-archive-mail

 export TEXTDOMAIN=${PROJECT_NAME}-archive-mail
 export TEXTDOMAINDIR="/usr/share/locale"
 
+source /usr/share/${PROJECT_NAME}/utils/${PROJECT_NAME}-utils-validation
+
 for d in /home/*/ ; do
     USERNAME=$(echo "$d" | awk -F '/' '{print $3}')
-    if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+    if [[ $(is_valid_user $USERNAME) == "1" ]]; then
         # for every user who has a mail directory
         if [ -d /home/$USERNAME/Maildir ]; then
             MUTTRC=/home/$USERNAME/.muttrc

src/freedombone-backup-local

     # Backup user files
     for d in /home/*/ ; do
         USERNAME=$(echo "$d" | awk -F '/' '{print $3}')
-        if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+        if [[ $(is_valid_user $USERNAME) == "1" ]]; then
 
             # Backup any gpg keys
             if [ -d /home/$USERNAME/.gnupg ]; then

src/freedombone-backup-remote

 function backup_users {
     for d in /home/*/ ; do
         USERNAME=$(echo "$d" | awk -F '/' '{print $3}')
-        if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+        if [[ $(is_valid_user $USERNAME) == "1" ]]; then
 
             # personal settings
             if [ -d /home/$USERNAME/personal ]; then
         # Social key management
         for d in /home/*/ ; do
             USERNAME=$(echo "$d" | awk -F '/' '{print $3}')
-            if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+            if [[ $(is_valid_user $USERNAME) == "1" ]]; then
                 disperse_key_shares $USERNAME $REMOTE_DOMAIN $REMOTE_SSH_PORT "$REMOTE_PASSWORD" $REMOTE_SERVER
             fi
         done

src/freedombone-base-email

     echo '#!/bin/bash' > /usr/bin/filterspam
     echo 'for d in /home/*/ ; do' >> /usr/bin/filterspam
     echo '    USERNAME=$(echo "$d" | awk -F '"'"'/'"'"' '"'"'{print $3}'"'"')' >> /usr/bin/filterspam
-    echo '    if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then' >> /usr/bin/filterspam
+    echo '    if [[ $USERNAME != "git" && $USERNAME != "go" && $USERNAME != "gogs" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then' >> /usr/bin/filterspam
     echo '        MAILDIR=/home/$USERNAME/Maildir/.learn-spam' >> /usr/bin/filterspam
     echo '        if [ ! -d "$MAILDIR" ]; then' >> /usr/bin/filterspam
     echo '           exit' >> /usr/bin/filterspam
     echo '#!/bin/bash' > /usr/bin/filterham
     echo 'for d in /home/*/ ; do' >> /usr/bin/filterham
     echo '    USERNAME=$(echo "$d" | awk -F '"'"'/'"'"' '"'"'{print $3}'"'"')' >> /usr/bin/filterham
-    echo '    if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then' >> /usr/bin/filterham
+    echo '    if [[ $USERNAME != "git" && $USERNAME != "go" && $USERNAME != "gogs" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then' >> /usr/bin/filterham
     echo '        MAILDIR=/home/$USERNAME/Maildir/.learn-ham' >> /usr/bin/filterham
     echo '        if [ ! -d "$MAILDIR" ]; then' >> /usr/bin/filterham
     echo '            exit' >> /usr/bin/filterham

src/freedombone-controlpanel

     echo '--------------------------------------------------------------------------'
     for d in /home/*/ ; do
         USRNAME=$(echo "$d" | awk -F '/' '{print $3}')
-        if [[ $USRNAME != "git" && $USRNAME != "mirrors" && $USRNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+        if [[ $(is_valid_user $USRNAME) == "1" ]]; then
             echo -n -e "$(pad_string ${USRNAME})"
             # get the SIP extension
             SIPEXT=

src/freedombone-restore-local

     if [ -d $USB_MOUNT/backup/mutt ]; then
         for d in $USB_MOUNT/backup/mutt/*/ ; do
             USERNAME=$(echo "$d" | awk -F '/' '{print $6}')
-            if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+            if [[ $(is_valid_user $USERNAME) == "1" ]]; then
                 if [ ! -d /home/$USERNAME ]; then
                     ${PROJECT_NAME}-adduser $USERNAME
                 fi
     if [ -d $USB_MOUNT/backup/gnupg ]; then
         for d in $USB_MOUNT/backup/gnupg/*/ ; do
             USERNAME=$(echo "$d" | awk -F '/' '{print $6}')
-            if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+            if [[ $(is_valid_user $USERNAME) == "1" ]]; then
                 if [ ! -d /home/$USERNAME ]; then
                     ${PROJECT_NAME}-adduser $USERNAME
                 fi
     if [ -d $USB_MOUNT/backup/procmail ]; then
         for d in $USB_MOUNT/backup/procmail/*/ ; do
             USERNAME=$(echo "$d" | awk -F '/' '{print $6}')
-            if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+            if [[ $(is_valid_user $USERNAME) == "1" ]]; then
                 if [ ! -d /home/$USERNAME ]; then
                     ${PROJECT_NAME}-adduser $USERNAME
                 fi
     if [ -d $USB_MOUNT/backup/spamassassin ]; then
         for d in $USB_MOUNT/backup/spamassassin/*/ ; do
             USERNAME=$(echo "$d" | awk -F '/' '{print $6}')
-            if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+            if [[ $(is_valid_user $USERNAME) == "1" ]]; then
                 if [ -d $USB_MOUNT/backup/spamassassin/$USERNAME ]; then
                     if [ ! -d /home/$USERNAME ]; then
                         ${PROJECT_NAME}-adduser $USERNAME
     if [ -d $USB_MOUNT/backup/ssh ]; then
         for d in $USB_MOUNT/backup/ssh/*/ ; do
             USERNAME=$(echo "$d" | awk -F '/' '{print $6}')
-            if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+            if [[ $(is_valid_user $USERNAME) == "1" ]]; then
                 if [ ! -d /home/$USERNAME ]; then
                     ${PROJECT_NAME}-adduser $USERNAME
                 fi
     if [ -d $USB_MOUNT/backup/config ]; then
         for d in $USB_MOUNT/backup/config/*/ ; do
             USERNAME=$(echo "$d" | awk -F '/' '{print $6}')
-            if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+            if [[ $(is_valid_user $USERNAME) == "1" ]]; then
                 if [ ! -d /home/$USERNAME ]; then
                     ${PROJECT_NAME}-adduser $USERNAME
                 fi
     if [ -d $USB_MOUNT/backup/monkeysphere ]; then
         for d in $USB_MOUNT/backup/monkeysphere/*/ ; do
             USERNAME=$(echo "$d" | awk -F '/' '{print $6}')
-            if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+            if [[ $(is_valid_user $USERNAME) == "1" ]]; then
                 if [ ! -d /home/$USERNAME ]; then
                     ${PROJECT_NAME}-adduser $USERNAME
                 fi
     if [ -d $USB_MOUNT/backup/fin ]; then
         for d in $USB_MOUNT/backup/fin/*/ ; do
             USERNAME=$(echo "$d" | awk -F '/' '{print $6}')
-            if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+            if [[ $(is_valid_user $USERNAME) == "1" ]]; then
                 if [ ! -d /home/$USERNAME ]; then
                     ${PROJECT_NAME}-adduser $USERNAME
                 fi
     if [ -d $USB_MOUNT/backup/local ]; then
         for d in $USB_MOUNT/backup/local/*/ ; do
             USERNAME=$(echo "$d" | awk -F '/' '{print $6}')
-            if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+            if [[ $(is_valid_user $USERNAME) == "1" ]]; then
                 if [ ! -d /home/$USERNAME ]; then
                     ${PROJECT_NAME}-adduser $USERNAME
                 fi
     if [ -d $USB_MOUNT/backup/personal ]; then
         for d in $USB_MOUNT/backup/personal/*/ ; do
             USERNAME=$(echo "$d" | awk -F '/' '{print $6}')
-            if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+            if [[ $(is_valid_user $USERNAME) == "1" ]]; then
                 if [ -d $USB_MOUNT/backup/personal/$USERNAME ]; then
                     if [ ! -d /home/$USERNAME ]; then
                         ${PROJECT_NAME}-adduser $USERNAME
     if [ -d $USB_MOUNT/backup/mail ]; then
         for d in $USB_MOUNT/backup/mail/*/ ; do
             USERNAME=$(echo "$d" | awk -F '/' '{print $6}')
-            if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+            if [[ $(is_valid_user $USERNAME) == "1" ]]; then
                 if [ ! -d /home/$USERNAME ]; then
                     ${PROJECT_NAME}-adduser $USERNAME
                 fi

src/freedombone-restore-remote

 export TEXTDOMAIN=${PROJECT_NAME}-restore-remote
 export TEXTDOMAINDIR="/usr/share/locale"
 
+source /usr/share/${PROJECT_NAME}/utils/${PROJECT_NAME}-utils-validation
+
 SERVER_NAME=$1
 
 # whether to restore everything or just a specific application
     fi
     for d in $SERVER_DIRECTORY/backup/mutt/*/ ; do
         USERNAME=$(echo "$d" | awk -F '/' '{print $6}')
-        if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+        if [[ $(is_valid_user $USERNAME) == "1" ]]; then
             if [ -d $SERVER_DIRECTORY/backup/mutt/$USERNAME ]; then
                 if [ ! -d /home/$USERNAME ]; then
                     ${PROJECT_NAME}-adduser $USERNAME
     fi
     for d in $SERVER_DIRECTORY/backup/gnupg/*/ ; do
         USERNAME=$(echo "$d" | awk -F '/' '{print $6}')
-        if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+        if [[ $(is_valid_user $USERNAME) == "1" ]]; then
             if [ -d $SERVER_DIRECTORY/backup/gnupg/$USERNAME ]; then
                 if [ ! -d /home/$USERNAME ]; then
                     ${PROJECT_NAME}-adduser $USERNAME
     fi
     for d in $SERVER_DIRECTORY/backup/procmail/*/ ; do
         USERNAME=$(echo "$d" | awk -F '/' '{print $6}')
-        if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+        if [[ $(is_valid_user $USERNAME) == "1" ]]; then
             if [ -d $SERVER_DIRECTORY/backup/procmail/$USERNAME ]; then
                 if [ ! -d /home/$USERNAME ]; then
                     ${PROJECT_NAME}-adduser $USERNAME
     fi
     for d in $SERVER_DIRECTORY/backup/spamassassin/*/ ; do
         USERNAME=$(echo "$d" | awk -F '/' '{print $6}')
-        if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+        if [[ $(is_valid_user $USERNAME) == "1" ]]; then
             if [ -d $SERVER_DIRECTORY/backup/spamassassin/$USERNAME ]; then
                 if [ ! -d /home/$USERNAME ]; then
                     ${PROJECT_NAME}-adduser $USERNAME
     fi
     for d in $SERVER_DIRECTORY/backup/ssh/*/ ; do
         USERNAME=$(echo "$d" | awk -F '/' '{print $6}')
-        if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+        if [[ $(is_valid_user $USERNAME) == "1" ]]; then
             if [ -d $SERVER_DIRECTORY/backup/ssh/$USERNAME ]; then
                 if [ ! -d /home/$USERNAME ]; then
                     ${PROJECT_NAME}-adduser $USERNAME
     fi
     for d in $SERVER_DIRECTORY/backup/config/*/ ; do
         USERNAME=$(echo "$d" | awk -F '/' '{print $6}')
-        if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+        if [[ $(is_valid_user $USERNAME) == "1" ]]; then
             if [ -d $SERVER_DIRECTORY/backup/config/$USERNAME ]; then
                 if [ ! -d /home/$USERNAME ]; then
                     ${PROJECT_NAME}-adduser $USERNAME
     fi
     for d in $SERVER_DIRECTORY/backup/monkeysphere/*/ ; do
         USERNAME=$(echo "$d" | awk -F '/' '{print $6}')
-        if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+        if [[ $(is_valid_user $USERNAME) == "1" ]]; then
             if [ -d $SERVER_DIRECTORY/backup/monkeysphere/$USERNAME ]; then
                 if [ ! -d /home/$USERNAME ]; then
                     ${PROJECT_NAME}-adduser $USERNAME
     fi
     for d in $SERVER_DIRECTORY/backup/fin/*/ ; do
         USERNAME=$(echo "$d" | awk -F '/' '{print $6}')
-        if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+        if [[ $(is_valid_user $USERNAME) == "1" ]]; then
             if [ -d $SERVER_DIRECTORY/backup/fin/$USERNAME ]; then
                 if [ ! -d /home/$USERNAME ]; then
                     ${PROJECT_NAME}-adduser $USERNAME
     fi
     for d in $SERVER_DIRECTORY/backup/local/*/ ; do
         USERNAME=$(echo "$d" | awk -F '/' '{print $6}')
-        if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+        if [[ $(is_valid_user $USERNAME) == "1" ]]; then
             if [ -d $SERVER_DIRECTORY/backup/local/$USERNAME ]; then
                 if [ ! -d /home/$USERNAME ]; then
                     ${PROJECT_NAME}-adduser $USERNAME
     fi
     for d in $SERVER_DIRECTORY/backup/personal/*/ ; do
         USERNAME=$(echo "$d" | awk -F '/' '{print $6}')
-        if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+        if [[ $(is_valid_user $USERNAME) == "1" ]]; then
             if [ -d $SERVER_DIRECTORY/backup/personal/$USERNAME ]; then
                 if [ ! -d /home/$USERNAME ]; then
                     ${PROJECT_NAME}-adduser $USERNAME
     fi
     for d in $SERVER_DIRECTORY/backup/mail/*/ ; do
         USERNAME=$(echo "$d" | awk -F '/' '{print $6}')
-        if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+        if [[ $(is_valid_user $USERNAME) == "1" ]]; then
             if [ -d $SERVER_DIRECTORY/backup/mail/$USERNAME ]; then
                 if [ ! -d /home/$USERNAME ]; then
                     ${PROJECT_NAME}-adduser $USERNAME

src/freedombone-sec

 CONFIGURATION_FILE=/root/${PROJECT_NAME}.cfg
 COMPLETION_FILE=$HOME/${PROJECT_NAME}-completed.txt
 
+source /usr/share/${PROJECT_NAME}/utils/${PROJECT_NAME}-utils-validation
+
 SSL_PROTOCOLS=
 SSL_CIPHERS=
 SSH_CIPHERS=
     monkeysphere_server_keys=$(monkeysphere-host show-key | grep $"OpenPGP fingerprint" | awk -F ' ' '{print $3}')
     for d in /home/*/ ; do
         USERNAME=$(echo "$d" | awk -F '/' '{print $3}')
-        if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+        if [[ $(is_valid_user $USERNAME) == "1" ]]; then
             if [ ! -d /home/$USERNAME/.monkeysphere ]; then
                 mkdir /home/$USERNAME/.monkeysphere
             fi
 function refresh_gpg_keys {
     for d in /home/*/ ; do
         USERNAME=$(echo "$d" | awk -F '/' '{print $3}')
-        if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+        if [[ $(is_valid_user $USERNAME) == "1" ]]; then
             su -c 'gpg --refresh-keys' - $USERNAME
         fi
     done

src/freedombone-syncthing

 export TEXTDOMAIN=$PROJECT_NAME-syncthing
 export TEXTDOMAINDIR="/usr/share/locale"
 
+source /usr/share/${PROJECT_NAME}/utils/${PROJECT_NAME}-utils-validation
+
 # File which keeps track of what has already been installed
 COMPLETION_FILE=$HOME/${PROJECT_NAME}-completed.txt
 
 
     for d in /home/*/ ; do
         USERNAME=$(echo "$d" | awk -F '/' '{print $3}')
-        if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+        if [[ $(is_valid_user $USERNAME) == "1" ]]; then
             echo "    <folder id=\"$USERNAME\" path=\"/home/$USERNAME/Sync/\" ro=\"false\" rescanIntervalS=\"60\" ignorePerms=\"false\" autoNormalize=\"true\">" >> $SYNCTHING_CONFIG_FILE
             # include any specified device IDs for this user
             if [ -f /home/$USERNAME/$SYNCTHING_USER_IDS_FILE ]; then
     echo "" > $TEMP_IDS_FILE
     for d in /home/*/ ; do
         USERNAME=$(echo "$d" | awk -F '/' '{print $3}')
-        if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+        if [[ $(is_valid_user $USERNAME) == "1" ]]; then
             if [ -f /home/$USERNAME/$SYNCTHING_USER_IDS_FILE ]; then
                 while read -r line || [[ -n "$line" ]]; do
                     line2="$(echo -e "${line}" | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//')"
     echo "" > $TEMP_IDS_FILE
     for d in /home/*/ ; do
         USERNAME=$(echo "$d" | awk -F '/' '{print $3}')
-        if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+        if [[ $(is_valid_user $USERNAME) == "1" ]]; then
             if [ -f /home/$USERNAME/$SYNCTHING_USER_IDS_FILE ]; then
                 while read -r line || [[ -n "$line" ]]; do
                     line2="$(echo -e "${line}" | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//')"
     # This allows it to appear within the user control panel
     for d in /home/*/ ; do
         USERNAME=$(echo "$d" | awk -F '/' '{print $3}')
-        if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+        if [[ $(is_valid_user $USERNAME) == "1" ]]; then
             echo "$SYNCTHING_ID" > /home/$USERNAME/.syncthing-server-id
             chown $USERNAME:$USERNAME /home/$USERNAME/.syncthing-server-id
         fi
 
     for d in /home/*/ ; do
         USERNAME=$(echo "$d" | awk -F '/' '{print $3}')
-        if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+        if [[ $(is_valid_user $USERNAME) == "1" ]]; then
             if [ -f /home/$USERNAME/$SYNCTHING_UPDATE_FILE ]; then
                 CHANGED=1
             fi

src/freedombone-utils-backup

     echo $"Setting permissions"
     for d in /home/*/ ; do
         USERNAME=$(echo "$d" | awk -F '/' '{print $3}')
-        if [[ $USERNAME != "git" && $USERNAME != "mirrors" && $USERNAME != "sync" && $USERNAME != "tahoelafs" ]]; then
+        if [[ $(is_valid_user $USERNAME) == "1" ]]; then
             chown -R $USERNAME:$USERNAME /home/$USERNAME
         fi
     done

src/freedombone-utils-validation

     VALID_CODE='yes'
 }
 
+function is_valid_user {
+    USRNAME="$1"
+    if [[ "$USRNAME" != "go" && "$USRNAME" != "gogs" && "$USRNAME" != "git" && "$USRNAME" != "mirrors" && "$USRNAME" != "sync" && "$USERNAME" != "tahoelafs" ]]; then
+        echo "1"
+    else
+        echo "0"
+    fi
+}
+
 # NOTE: deliberately no exit 0