debctl is a CLI tool for managing apt repositories. It's intended as a replacement for add-apt-repository and apt-key that supports the newer deb822 format and implements modern best practices for managing signing keys.

What's wrong with the existing tools?

• add-apt-repository adds repository entries to /etc/apt/sources.list, which is being phased out by the newer deb822 format.
• apt-key is deprecated because it trusts signing keys for all apt repositories instead of just the ones they're meant to be signing.

This tool tries to encourage best practices while providing escape hatches for doing weird stuff.

Install Rust and run:

cargo install debctl

This tool shells out to GnuPG for working with PGP keys, so you must have gpg installed and available on your PATH.

Let's add the Docker apt repository to your system:

debctl new \
    --name docker \
    --uri https://download.docker.com/linux/ubuntu \
    --key https://download.docker.com/linux/ubuntu/gpg \
    --component stable

This downloads the signing key for the repository and installs it under /etc/apt/keyrings/. It can fetch the signing key from a URL, a local file path, or a keyserver and install it to a keyring or inline it into the .sources file.

This command creates the repository entry at /etc/apt/sources.list.d/docker.sources. Here's what that file looks like:

Enabled: yes
Types: deb
URIs: https://download.docker.com/linux/ubuntu
Suites: jammy
Components: stable
Signed-By: /etc/apt/keyrings/docker.gpg

Most documentation for third-party apt repositories directs users to use add-apt-repository. This tool accepts the old-style syntax used by add-apt-repository and converts it to deb822 syntax:

debctl add \
    --name docker \
    --key https://download.docker.com/linux/ubuntu/gpg \
    'deb [arch=amd64 lang=en,de] https://download.docker.com/linux/ubuntu jammy stable'

Here's the file that command generates:

Enabled: yes
Types: deb
URIs: https://download.docker.com/linux/ubuntu
Suites: jammy
Components: stable
Signed-By: /etc/apt/keyrings/docker.gpg
Architectures: amd64
Languages: en de

You can also convert existing old-style .list files to deb822-style .sources files:

debctl convert --name docker

This replaces /etc/apt/sources.list.d/docker.list with /etc/apt/sources.list.d/docker.sources.

Entries that are commented out in the .list file are included in the .sources file, but with the Enabled: no option set. Regular comments in the .list file are preserved and included in the .sources file.