link to search.nixos.org instead of pulling package metadata out of pkgs. this
lets us cache docs of a few more modules and provides easier access to package
info from the HTML manual, but makes the manpage slightly less useful since
package description are no longer rendered.
most modules can be evaluated for their documentation in a very
restricted environment that doesn't include all of nixpkgs. this
evaluation can then be cached and reused for subsequent builds, merging
only documentation that has changed into the cached set. since nixos
ships with a large number of modules of which only a few are used in any
given config this can save evaluation a huge percentage of nixos
options available in any given config.
in tests of this caching, despite having to copy most of nixos/, saves
about 80% of the time needed to build the system manual, or about two
second on the machine used for testing. build time for a full system
config shrank from 9.4s to 7.4s, while turning documentation off
entirely shortened the build to 7.1s.
Previously, this was only implicitly enabled if xserver.enable = true.
However, Wayland-based desktops do not require this, and so configuring
SSH_ASKPASS on a Wayland desktop becomes cumbersome. This simplifies
that by adding a new option that defaults to the old conditional.
easiest way to do this is to move the default expression out and
abstract over what is substituted into it, using a dependent value for
the default and a descriptive value for defaultText
some options have default that are best described in prose, such as
defaults that depend on the system stateVersion, defaults that are
derivations specific to the surrounding context, or those where the
expression is much longer and harder to understand than a simple text
snippet.
bcc doesn't really need kernel itself, it just cares about module path.
It's actually better to use /run/booted-system/kernel-modules/lib/modules
for two reasons:
- no need to rebuild bcc for each new kernel
- can use a newer bcc with a booted kernel that doesn't match the current
system
* less: enable by default and set LESS=-R via lesskey
* since we set PAGER=less, programs.less.enable should default to
true.
* some programs, notably git, set a custom LESS environment if none is
present. using the lesskey mechanism to set LESS=-R lets such
programs continue to run less as they see fit.
This reverts commit 0e7b4e60a8.
* less: remove use of deprecated lesskey binary format
* less: enable in environment.nix rather than less.nix
per discussion in #139988
This module allows setting global configuration for htop in /etc/htoprc,
for example to disable showing userland threads by default
Co-authored-by: pennae <82953136+pennae@users.noreply.github.com>
Co-authored-by: Aaron Andersen <aaron@fosslib.net>
Apparently setting a variable via `environment.variables` when the same
is already present in `environment.sessionVariables` (that is merged
into the former option) creates a conflict.
For reference: this started with the change in #101274.
