https://blog.scottlowe.org/2023/12/15/conditional-git-configuration/

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Conditional Git Configuration

 Published on 15 Dec 2023 *  Filed in Explanation *  304 words
(estimated 2 minutes to read)

Building on the earlier article on automatically transforming Git
URLs, I'm back with another article on a (potentially powerful)
feature of Git--the ability to conditionally include Git configuration
files. This means you can configure Git to be configured (and behave)
differently based on certain conditions, simply by including or not
including Git configuration files. Let's look at a pretty
straightforward example taken from my own workflow.

Here's a configuration stanza from my own system-wide Git
configuration:

[includeIf "gitdir:~/Work/Code/Repos/"]
    path = ~/Work/Code/Repos/.gitconfig

The key here is the includeIf keyword. In this case, Git will include
the referenced configuration file specified by path, if the location
of the Git repository matches the path specification after gitdir.
Basically, what this means is that all repositories under ~/Work/Code
/Repos will trigger the inclusion of the additional configuration
file.

Here's the additional configuration file:

[user]
    email = name@work-domain.com
    name = Scott Lowe
[commit]
    gpgsign = false

As long as I group all work-relatd repositories in the specified
directory path, these values override the system-wide values. This
means I can specify my work e-mail address as the e-mail address to
be associated with commits to work-related repositories while all
others use a different e-mail address. This configuration also allows
me to disable GPG signing of commits for work-related repositories
(i.e., repositories in the specified path), since I don't have a GPG
key associated with my work e-mail address.

Could you do this with per-repository configuration settings?
Absolutely. This configuration mechanism allows you to apply
configuration settings to groups of repositories based on their
filesystem location, instead of having to do the same thing on a
per-repository basis.

I hope you find this information useful. Do feel free to hit me up--on
the Fediverse, on Twitter, or in any of a variety of Slack
communities--if you have any questions or any feedback!

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