Best practice – Git + Build automation – Keeping configs separate

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That is called content filter driver, and it allows you to declare, in a .gitattributes file (and only for your config files type) a smudge script which will automatically on checkout:

  • combine a config file template file (config.tpl)
  • with the right config file value (config.dev, config.prod, …)
  • in order to produced a non-versioned config file (private file)

Smudge filter

See “Customizing Git – Git Attributes“:

echo '*.cfg.tpl filter=config' >> .gitattributes
git config --global filter.config.smudge yourScript

With that approach, you don’t need submodules, but you can generate as many config file you need depending on your environment, like for instance your branch:
A bit like in “Find Git branch name in post-update hook“, your smudge script can find out in which branch it is currently executing with:

#!/bin/sh
branch=$(git rev-parse --symbolic --abbrev-ref HEAD)

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