Format all Nix files using the officially approved formatter,
making the CI check introduced in the previous commit succeed:
nix-build ci -A fmt.check
This is the next step of the of the [implementation](https://github.com/NixOS/nixfmt/issues/153)
of the accepted [RFC 166](https://github.com/NixOS/rfcs/pull/166).
This commit will lead to merge conflicts for a number of PRs,
up to an estimated ~1100 (~33%) among the PRs with activity in the past 2
months, but that should be lower than what it would be without the previous
[partial treewide format](https://github.com/NixOS/nixpkgs/pull/322537).
Merge conflicts caused by this commit can now automatically be resolved while rebasing using the
[auto-rebase script](8616af08d9/maintainers/scripts/auto-rebase).
If you run into any problems regarding any of this, please reach out to the
[formatting team](https://nixos.org/community/teams/formatting/) by
pinging @NixOS/nix-formatting.
This allows for instance to reject switching into a configuration, while
still allowing to reboot into that same configuration.
This can be useful for instance to reject switching to a configuration
with a new systemd major version, but setting that same configuration as
the new boot default with `switch-to-configuration boot` is fine.
A couple of improvements:
1. Avoid the generally discouraged apply argument to options, as it has
quite weird semantics
2. Avoid issues when a user calls a preSwitchCheck `script`, which
would've been silently overridden by the existing implementation.
Reliance on a special attribute name like that is bound to lead to a
very-hard-to-debug problem for someone at some point
3. Use writeShellApplication so that the preSwitchChecks are checked by
shellcheck and and so that they run with basic bash guardrails
4. Fix shellcheck issue (testing the value of $?)
5. Add a positive preSwitchCheck to the nixos test, to make sure that
that works as intended
The newer runTest handler uses a single nixpkgs instance to eval all the
specialisations, reducing the memory usage and eval time of the test
drastically compared to handleTest which creates a new nixpkgs instance
for every specialisation.
Add an option for shell script fragments that are ran before switching
to a new NixOS system configuration (pre installation of bootloader or
system activation). Also add a new subcommand for
switch-to-configuration called "check" that will cause the program to
always exit after checks are ran.
Previously, the base system had grub in `systemPackages` but the
specialisations did not. This is because of a few factors:
- Grub was enabled in the nixos config
- Specialisations set `grub.device = "nodev"` (see: system/activation/no-clone.nix)
- Grub is added to `systemPackages` depending on whether `devices == ["nodev"]`
This meant that switching between the base system and a specialisation
always changed `system-path.drv`, which is a reload trigger for
dbus. With grub disabled in this test, this no longer happens.
This adds an implementation of switch-to-configuration that allows for
closer interaction with the lifecycle of systemd units by using DBus
APIs directly instead of using systemctl. It is disabled by default, but
can be enabled by specifying `{ system.switch = { enable = false; enableNg = true; }; }`.
We should sometimes restart the units rather than reloading them so the
changes are actually applied. / and /nix are explicitly excluded because
there was some very old issue where these were unmounted. I don't think
this will affect many people since most people use fstab mounts instead
but I plan to adapt this behavior for fstab mounts as well in the future
(once I wrote a test for the fstab thingies).
Currently the test-watch.service gets started in a loop as long as
/testpath exists, so `rm /testpath /testpath-modified` runs into a race
condition where if the service was just getting activated, it will
create /testpath-modified and make the test fail.
This is fixed by making the service RemainAfterExit so that it only
starts once, and stopping it manually after we remove /testpath.
systemd needs this so special characters (like the ones in wireguard
units that appear because they are part of base64) can be escaped using
the \x syntax.
Root of the issue is that `glob()` handles the backslash internally
which is obviously not what we want here.
Also add a test case and fix some perlcritic issues in the subroutine.
- Fully get rid of `parseKeyValues` and use systemctl features for that
- Add some regex modifiers recommended by perlcritic
- Get rid of a postfix if
- Sort units when showing their status
- Clean the logic for showing what failed from `elif` to `next`
- Switch from `state` to `substate` for `auto-restart` because that's
actually where the value is stored
- Show status of units with one single systemctl call and get rid of
COLUMNS in favor of --full
- Add a test for failing units
This removes `/run/nixos/activation-reload-list` (which we will need in
the future when reworking the reload logic) and makes
`/run/nixos/activation-restart-list` honor `restartIfChanged` and
`reloadIfChanged`. This way activation scripts don't have to bother with
choosing between reloading and restarting.
This reverts commit 57961d2b83, reversing
changes made to b04f913afc.
(I.e. this reverts PR #141192.)
While well-intended, this change does unfortunately introduce very
serious regressions that are especially disruptive/noticeable on desktop
systems (e.g. users of Sway will loose their graphical session when
running "nixos-rebuild switch").
Therefore, this change has to be reverted ASAP instead of trying to fix
it in "production".
Note: An updated version should be extensively discussed, reviewed, and
tested before re-landing this change as an earlier version also had to
be reverted for the exact same issues [0].
Fix: #146727
[0]: https://github.com/NixOS/nixpkgs/pull/73871#issuecomment-559783752
