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home-manager/doc/release-notes/rl-2111.adoc
Robert Helgesson 5f433eb164
Move platform check into modules
Before, loading a module would be guarded by an optional platform
condition. This made it possible to avoid loading and evaluating a
module if it did not support the host platform.

Unfortunately, this made it impossible to share a single configuration
between GNU/Linux and Darwin hosts, which some wish to do.

This removes the conditional load and instead inserts host platform
assertions in the modules that are platform specific.

Fixes #1906
2021-07-18 20:43:22 +02:00

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[[sec-release-21.11]]
== Release 21.11
This is the current unstable branch and the information in this
section is therefore not final.
[[sec-release-21.11-highlights]]
=== Highlights
This release has the following notable changes:
* All Home Manager modules are now loaded on all platforms. With this
change you will get a more descriptive error message if you attempt to
enable a module that is incompatible with the host platform.
+
Previously, modules that were platform specific would only be loaded
on that particular platform. For example, a module defining a
https://systemd.io/[systemd] service would only be loaded when the
host platform was Linux. This reduced evaluation times, simplified the
generated documentation, and made it impossible to accidentally use
modules that do not support the host platform.
+
While the above benefits are quite nice, avoiding module loads also
brings a few problems. For example, the
https://nix-community.github.io/home-manager/[public documentation]
will only show the options available for Linux hosts and the
documentation cannot make references to options within modules that
are unavailable on some hosts. Finally, users who wish to use the same
configuration file for different platforms cannot do so, even if the
platform incompatible options are unused.
+
Ultimately, the benefits of loading all modules won and the behavior
has now changed. For associated discussion see
https://github.com/nix-community/home-manager/issues/1906[issue #1906].
[[sec-release-21.11-state-version-changes]]
=== State Version Changes
The state version in this release includes the changes below. These
changes are only active if the `home.stateVersion` option is set to
"21.11" or later.
* Nothing has happened.