Upgrade scripts


After each sysupgrade (including the initial installation), Gluon will execute all scripts under /lib/gluon/upgrade. These scripts’ filenames usually begin with a 3-digit number specifying the order of execution.

To get an overview of the ordering of all scripts of all packages, the helper script contrib/lsupgrade.sh in the Gluon repository can be used, which will print all upgrade scripts’ filenames and directories. If executed on a TTY, the filename will be highlighted in green, the repository in blue and the package in red.

Best practices

  • Most upgrade scripts are written in Lua. This allows using lots of helper functions provided by LuCi and Gluon, e.g. to access the site configuration or edit UCI configuration files.
  • Whenever possible, scripts shouldn’t check if they are running for the first time, but just edit configuration files to achive a valid configuration (without overwriting configuration changes made by the user where desirable). This allows using the same code to create the initial configuration and upgrade configurations on upgrades.
  • If it is unavoidable to run different code during the initial installation, the sysconfig.gluon_version variable can be checked. This variable is nil during the initial installation and contains the previously install Gluon version otherwise. The package gluon-legacy (which is responsible for upgrades from the old firmwares of Hamburg/Kiel/Lübeck) uses the special value legacy; other packages should handle this value just as any other string.

Script ordering

These are some guidelines for the script numbers:

  • 0xx: Basic sysconfig setup
  • 1xx: Basic system setup (including basic network configuration)
  • 2xx: Wireless setup
  • 3xx: Advanced network and system setup
  • 4xx: Extended network and system setup (e.g. mesh VPN and next-node)
  • 5xx: Miscellaneous (everything not fitting into any other category)
  • 6xx .. 8xx: Currently unused
  • 9xx: Upgrade finalization