How to switch git email based on host?

Question

I have accounts in three different Git service providers - GitHub, GitLab and BitBucket. I want to ensure that my commits are signed via SSH in all of the mentioned providers, which is not possible since I have assigned a GitLab email at the moment, and all of my accounts use unique emails. This only verifies signed commits for GitLab successfully. How do I make it so that GitHub/BitBucket repositories will be assigned to their respective email?

Haven't found anything online that deals with this. There is a "gitdir" method, but I am not looking for this. I am expecting that Git understands what host I am using (if on GitHub, use [email protected], if on GitLab, use [email protected] and so on), and based on that, assign emails.

Answer 1

Unfortunately, Git config does not support conditionals directly, but includes other config files. I was able to resolve my issue by using hasconfig:remote.*.url condition for includeIf. You may remove the email variable under [user] block - this is your global email. Create four new blocks for the same (two for each remote - one for HTTPS one for SSH). Here's an example of how my .gitconfig file looks like:

.gitconfig

[user]
  name = <Your name>

[includeIf "hasconfig:remote.*.url:[email protected]:**/**"]
    path = github

[includeIf "hasconfig:remote.*.url:https://github.com/**/**"]
    path = github

[includeIf "hasconfig:remote.*.url:[email protected]:**/**"]
    path = gitlab

[includeIf "hasconfig:remote.*.url:https://gitlab.com/**/**"]
    path = gitlab

[init]
  defaultBranch = main

[core]
  editor = vim 

[color]
  ui = auto

[gpg]
  format = ssh 

[commit]
  gpgsign = true

Now create config files for the respective remotes. I've created .github, and .gitlab in the same directory as .gitconfig:

.github

[user]
  email = [email protected]
  signingkey = ~/.ssh/github-key.pub

.gitlab

[user]
  email = [email protected]
  signingkey = ~/.ssh/gitlab-key.pub

Edit 1: Initially, there were three different configs, one for GitHub, GitLab and Bitbucket, I've removed Bitbucket for simplicity.