We created accounts on GitHub, Gitlab and Bitbucket. In Github and GitLab we set our email addresses to private to have the warehouses generate a commit email address.

Gitconfig

We cannot configure git globally with two different email addresses at the same time (mutually exclusive).

We can either configure each github or gitlab repository locally with whichever commit email address applies OR we can create, github, gitlab and bitbucket folders in a Development folder for the respective repositories and put in the user's root folder a .gitconfig:

    [includeIf "gitdir/i:~/Development/github/"]
    path = .gitconfig-hub
    [includeIf "gitdir/i:~/Development/gitlab/"]
    path = .gitconfig-lab
    [includeIf "gitdir/i:~/Development/bitbucket/"]
    path = .gitconfig-bitbucket

And in the same root folder as the .gitconfig, we created a .gitconfig-hub, a .gitconfig-lab, and a .gitconfig-bitbucket. These contain:

For the github gitdir:

    [user]
        name=[github username]
        email=[number]+[username]@users.noreply.github.com

For the gitlab gitdir (mind the minus sign):

    [user]
        name=[gitlab username]
        email=[number]-[username]@users.noreply.gitlab.com

For the bitbucket gitdir:

    [user]
        name= [bitbucket username]
        email=[user@email.address]

If this is a change of name and/or email address, reset the author information on the last commit with:

    $ git commit --amend --reset-author

SSH keys

Create a set of SSH keys for each warehouse, and connect those with the warehouse accounts

    $ ssh-keygen -f ~/github-key-ed25519 -t ed25519 -C "[number]+[username]@users.noreply.github.com"

    $ ssh-keygen -f ~/gitlab-key-ed25519 -t ed25519 -C "[number]-[username]@users.noreply.gitlab.com"

    $ ssh-keygen -f ~/bitbucket-key-ed25519 -t ed25519 -C "[username]@email.com"

SSH configuration

Check to see if ~/.ssh/config exists:

    $ ls ~/.ssh/

If not create it, and create the default keys. Either way, move all key pairs into that folder. Create or change the `~/.ssh/config`:

    Host github.com
        HostName github.com
        IdentityFile ~/.ssh/github-key-ed25519
        IdentitiesOnly yes
        User [github username]

    Host gitlab.com
        HostName gitlab.com
        IdentityFile ~/.ssh/gitlab-key-ed25519
        IdentitiesOnly yes
        User [gitlab username]

    Host bitbucket.org
        Hostname bitbucket.org
        IdentityFile ~/.ssh/bitbucket-key-ed25519
        IdentitiesOnly yes
        User [bitbucket username]

    Host *
        IdentityFile ~/.ssh/key-ed25519
        User [username]

Start the ssh-agent in the background:

    $ eval "$(ssh-agent -s)"

For each warehouse, add the private keys to the ssh-agent:

    $ ssh-add -k ~/.ssh/[warehouse]-key-ed25519

And add public key (content of clipboard) to the warehouse:

• Go to your warehouse Account Settings
• Find the section where SSH and GPG Keys can be added.
• Click New SSH Key button.
• Add a label (any) and paste the public key into the big text box.

Check the connection:

    $ ssh -T git@[warehouse].[tld]

Now you can clone repos with:

    [warehouse] $ git clone git@[warehouse].[tld]:[name]/[repo-name]

cd into repo directory and connect local and remote repo:

    [warehouse]/repo-name $ git remote set-url origin git@[warehouse].[tld]:[name]/[repo-name].git

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