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Designing multiple architecture environments

Flox makes it simple to have the same environment on multiple systems and CPU architectures. This guide walks through an example between two coworkers who have different system types, and shows how to customize your environment with system-specific dependencies.

Creating an environment

To get started, let's create an environment from a Linux laptop. This laptop is using an ARM CPU (aarch64) which makes its full system type aarch64-linux.

When using flox search you may see packages that won't immediately work with your manifest, but finding and allowing system specific packages is very easy. Flox shows software from the following systems: aarch64-darwin, x86_64-darwin, aarch64-linux, and x86_64-linux.

Some packages may support only a subset of system types. You can inspect a package with flox show to see what system types are supported:

$ flox show gdb
gdb - The GNU Project debugger
    gdb@14.2 (aarch64-linux, x86_64-darwin, x86_64-linux only)
    gdb@14.1 (aarch64-linux, x86_64-darwin, x86_64-linux only)
    gdb@13.2 (aarch64-linux, x86_64-darwin, x86_64-linux only)
    gdb@13.1 (aarch64-linux, x86_64-darwin, x86_64-linux only)
...

First let's install some packages to our environment running on Linux:

$ flox init --name eng-team-tools
✨ Created environment eng-team-tools (aarch64-linux)
...
$ flox install gnupg vim
✅ 'gnupg' installed to environment eng-team-tools at /home/youruser
✅ 'vim' installed to environment eng-team-tools at /home/youruser

To make it easy to share this system across platforms we are going to share it on FloxHub with flox push. 

$ flox push
✅  eng-team-tools successfully pushed to FloxHub

    Use 'flox pull youruser/eng-team-tools' to get this environment in any other location.

Learn more about this and other sharing options in the sharing environments guide.

Using the environment from a different system type

Many packages in Flox will work without any issue across system types.

To test this out, run flox pull from another system such as an Apple machine with an M-series processor. This system type is aarch64-darwin. Then lets run the a simple gpg --version command to test everything is working. 

$ flox pull youruser/eng-team-tools
✨  Pulled youruser/eng-team-tools from https://hub.flox.dev

    You can activate this environment with 'flox activate'
$ flox activate -- gpg --version
gpg (GnuPG) 2.4.5
libgcrypt 1.10.3
Copyright (C) 2024 g10 Code GmbH
...

Looks like the environment works cross-platform, nice!

Handling unsupported packages

However, some packages only work with a subset of systems. To demonstrate this let's install a package that isn't compatible with an Apple machine and set a system-specific option for these packages.

From the Linux machine...

$ flox install systemd # (1)!
❌ ERROR: resolution failed: package 'systemd' not available for
    - aarch64-darwin
    - x86_64-darwin
  but it is available for
    - aarch64-linux
    - x86_64-linux
  1. systemd is only available on Linux systems

To install systemd for compatible systems, flox edit the manifest.

$ flox edit

We will add systemd and include its systems attribute to filter only for the supported systems.

manifest.toml
[install]
...
gnupg.pkg-path = "gnupg" # (1)!
vim.pkg-path = "vim"

systemd.pkg-path = "systemd" # (2)!
systemd.systems = ["aarch64-linux", "x86_64-linux"] # (3)!
  1. These packages were installed using flox install earlier.
  2. Here we are declaring a new installation, systemd.
  3. To allow non-Linux users to use this environment, the system attribute filters for just Linux systems.

With the edits complete, save and quit your editor. The environment should update successfully!

$ flox edit
✅ Environment successfully updated.

Finally, we can push this update so we can list packages from the Apple machine to verify everything works.

$ flox push
✅  Updates to eng-team-tools successfully pushed to FloxHub

    Use 'flox pull youruser/eng-team-tools' to get this environment in any other location.

Then, from the Apple machine, lets pull the latest.

$ flox pull
✅ Pulled ghudgins/default from https://hub.flox.dev/

You can activate this environment with 'flox activate' 
$ flox list
gnupg: gnupg (2.4.5)
vim: vim (9.1.0377)
$ flox list -c
...
[install]
gnupg.pkg-path = "gnupg"
vim.pkg-path = "vim"
systemd.pkg-path = "systemd"
systemd.systems = ["aarch64-linux"]
...

The Apple machine does not have systemd despite it appearing in the manifest. This environment will activate on both machines and the Apple machine won't get the systemd package.

Where to next?