What is aptly?

Aptly is a tool for managing Debian and Ubuntu software repositories. If you've ever needed to host your own packages, create a local mirror of an upstream repository, or carefully control which versions of software are available to your servers, this tool handles those tasks. At a high level, it lets you create a copy (or "mirror") of a remote software repository so you can access those packages locally. You can then take snapshots of that mirror at specific points in time, which freezes the state of the repository. This means you can capture a known-good set of software versions and keep them stable, even as the original remote repository updates and changes. You can also merge multiple snapshots together, selectively update individual packages while tracking their dependencies, and publish the result as a repository that standard package managers (like apt) can use. System administrators and DevOps teams are the primary users. For example, if a company runs a fleet of Ubuntu servers and wants to ensure they all install the exact same versions of software without relying on the public internet, they would use this tool to create a local mirror, snapshot it, and point their servers at that snapshot. It's also useful for teams that build their own internal software packages and need a way to publish them as a repository that their servers can pull from. The project is written in Go and compiles to a standalone binary with minimal dependencies, making it straightforward to deploy. The README is sparse on architectural detail, but the feature list is clear: the tool already handles core repository tasks like mirroring, snapshotting, merging, and publishing. A few features are still marked as planned, including the ability to mirror repositories without resigning them and support for yum repositories (used by other Linux distributions like CentOS or Red Hat).