44 lines
2.1 KiB
ReStructuredText
44 lines
2.1 KiB
ReStructuredText
Upgrade scripts
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===============
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Basics
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------
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After each sysupgrade (including the initial installation), Gluon will execute all scripts
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under ``/lib/gluon/upgrade``. These scripts' filenames usually begin with a 3-digit number
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specifying the order of execution.
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To get an overview of the ordering of all scripts of all packages, the helper script ``contrib/lsupgrade.sh``
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in the Gluon repository can be used, which will print all upgrade scripts' filenames and directories. If executed
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on a TTY, the filename will be highlighted in green, the repository in blue and the package in red.
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Best practices
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--------------
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* Most upgrade scripts are written in Lua. This allows using lots of helper functions provided
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by Gluon, e.g. to access the site configuration or edit UCI configuration files.
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* Whenever possible, scripts shouldn't check if they are running for the first time, but just edit configuration
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files to achive a valid configuration (without overwriting configuration changes made by the user where desirable).
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This allows using the same code to create the initial configuration and upgrade configurations on upgrades.
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* If it is unavoidable to run different code during the initial installation, the ``sysconfig.gluon_version`` variable
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can be checked. This variable is ``nil`` during the initial installation and contains the previously install Gluon
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version otherwise. The package ``gluon-legacy`` (which is responsible for upgrades from the old firmwares of
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Hamburg/Kiel/Lübeck) uses the special value ``legacy``; other packages should handle this value just as any other
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string.
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Script ordering
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---------------
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These are some guidelines for the script numbers:
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* ``0xx``: Basic ``sysconfig`` setup
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* ``1xx``: Basic system setup (including basic network configuration)
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* ``2xx``: Wireless setup
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* ``3xx``: Advanced network and system setup
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* ``4xx``: Extended network and system setup (e.g. mesh VPN and next-node)
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* ``5xx``: Miscellaneous (everything not fitting into any other category)
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* ``6xx`` .. ``8xx``: Currently unused
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* ``9xx``: Upgrade finalization
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