Set minimum disk space free for synthing

src/freedombone-app-syncthing

@@ -43,6 +43,7 @@ SYNCTHING_RELEASES='https://api.github.com/repos/syncthing/syncthing/releases?pe
 SYNCTHING_PORT=22000
 SYNCTHING_SHARED_DATA=/var/lib/syncthing/SyncShared
 SYNCTHING_USER_IDS_FILE='.syncthingids'
+SYNCTHING_MIN_DISK_SPACE_FREE_PERCENT=20
 
 SYNCTHING_SHORT_DESCRIPTION=$'File synchronization'
 SYNCTHING_DESCRIPTION=$'File synchronization'
@@ -272,6 +273,12 @@ function reconfigure_syncthing {
 
 function upgrade_syncthing {
     echo -n ''
+    if [ -f /root/.config/syncthing/config.xml ]; then
+        if ! grep -q "minDiskFree unit=\"%\">$SYNCTHING_MIN_DISK_SPACE_FREE_PERCENT<" /root/.config/syncthing/config.xml; then
+            sed -i "s|minDiskFree unit=.*|minDiskFree unit=\"%\">$SYNCTHING_MIN_DISK_SPACE_FREE_PERCENT</minDiskFree>|g" /root/.config/syncthing/config.xml
+            systemctl restart syncthing
+        fi
+    fi
 }
 
 function backup_local_syncthing {
@@ -480,6 +487,10 @@ function install_syncthing {
     function_check configure_firewall_for_syncthing
     configure_firewall_for_syncthing
 
+    if [ -f /root/.config/syncthing/config.xml ]; then
+        sed -i "s|minDiskFree unit=.*|minDiskFree unit=\"%\">$SYNCTHING_MIN_DISK_SPACE_FREE_PERCENT</minDiskFree>|g" /root/.config/syncthing/config.xml
+    fi
+
     APP_INSTALLED=1
 }