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When something changes in nixos-rebuild, we must make sure the
installers still work, otherwise it might break existing setups.
The installer tests check whether nixos-rebuild works, so they are a
good lithmus test.
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nixos-rebuild would forward all verbose flags to nix, but not actually
increase its own verbosity.
Which would make it hard to see what’s going on without resorting to
tools like strace or adding `set -x` to the script.
We add a simple exec wrapper around the most “interesting” commands,
that is nix tool invocations. If any verbosity flag is given, it will
set the verbosity flag of the nixos-rebuild script all commands
wrapped into `runCmd` will start logging their invocation.
This is done via a `logVerbose` function, which can also be used to
print logging messages when in verbose mode, to aid debugging why
nixos-rebuild does what it does. A few messages are added, but
potentially we could log a lot more details.
Now, testing all of the changed code paths turns out to be rather
hard, so I am unsure how to verify that for all changed commands
behaviour stays indeed the same.
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remotely and impurely
It doesn't work and it's not required for building.
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Mostly for more readability in shell scripts.
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Was only used in the code removed in commit
c274d045ac254afe96b1f8139e974ada2c42059e.
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The removed lines converted the flake path passed by the command line
from `/some/path` to `git+file:///some/path`.
This technically shouldn't cause any issues, however running
`nixos-rebuild switch` inside a directory `/nix/store` will cause the
switch to fail and leave a partially construct generation (see issue #144811
for details).
By itself this shouldn't be too much of an issue, however thanks to
another issue in `systemd-boot-builder.py` this can leave the system
in a broken state for those using `boot.loader.systemd-boot` (AFAIK the
default), where future `nixos-rebuild switch` will fail
(see issue #93694 for details).
The issue can be fixed by running
`nix-env -p /nix/var/nix/profiles/system --delete-generations old`,
however this makes newbies very confused and it is showing in our
support threads in Matrix and Discourse (see
https://discourse.nixos.org/t/need-help-on-failure-of-building-my-configuration/16842).
Keep in mind this is a workaround. The actual issue seems to be in nix
itself (see: https://github.com/NixOS/nix/issues/5510).
See also #150065 for an alternative fix that caused other issues.
Kudos for @figsoda for figuring out this fix.
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This seems to break
`boot.kernelPackages = config.boot.zfs.package.latestCompatibleLinuxPackages`
causing it to use `linuxPackages`.
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This is a workaround for issue #144811 until this issue is either fixed
on nix itself.
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nixos-rebuild relies on setting an environment variable to change
behaviour during nixos-rebuild boot/switch between calling update or
install via systemd bootctl. Adding sudo -- as a prefix to various exec
calls does not preserve the environment breaking this mechanism.
This is a some what ugly fix that works.
Closes https://github.com/NixOS/nixpkgs/pull/144429
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nixos-rebuild: add --use-substitutes option
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nixos-rebuild: default buildHost to localhost
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Prior to #119540, the toplevel output was built
locally then pushed to the remote host when using
the command:
nixos-rebuild --flake <flake> --target-host remote.host
However, buildHost would default to targetHost when
only --target-host was supplied. This caused the .drv
closure to always be transferred unless --build-host=localhost
is supplied.
This change restores the previous build local default behavior.
TargetHost can still build the outputs, if explicitly mentioned:
nixos-rebuild --flake <flake> \
--target-host remote.host \
--build-host remote.host
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Previously when doing a nixos-rebuild build-vm we see a message saying how to
run the VM, but with nixos-rebuild build-vm-with-bootloader we did not. We
now show it in both cases.
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Without this, failure of nixBuild() and nixFlakeBuild() was ignored
(since bash doesn't inherit 'set -e' in subshells by default), so the
script would proceed with a bogus ./result link, e.g.
++ readlink -f /tmp/nixos-rebuild.NfHKxx/result
+ pathToConfig='/nix/store/m7dvk6an18cpr95qn5wnig2600qhv6w7-nix-2.4pre20210727_706777a/bin/nix
/tmp/nixos-rebuild.NfHKxx/result'
+ '[' test = switch -o test = boot ']'
+ copyToTarget '/nix/store/m7dvk6an18cpr95qn5wnig2600qhv6w7-nix-2.4pre20210727_706777a/bin/nix
/tmp/nixos-rebuild.NfHKxx/result'
+ '[' '' = '' ']'
+ '[' test = switch -o test = boot -o test = test -o test = dry-activate ']'
+ targetHostCmd /nix/store/m7dvk6an18cpr95qn5wnig2600qhv6w7-nix-2.4pre20210727_706777a/bin/nix /tmp/nixos-rebuild.NfHKxx/result/bin/switch-to-configuration test
+ '[' -z '' ']'
+ sudo -- /nix/store/m7dvk6an18cpr95qn5wnig2600qhv6w7-nix-2.4pre20210727_706777a/bin/nix /tmp/nixos-rebuild.NfHKxx/result/bin/switch-to-configuration test
error: '/tmp/nixos-rebuild.NfHKxx/result/bin/switch-to-configuration' is not a recognised command
Try '/nix/store/m7dvk6an18cpr95qn5wnig2600qhv6w7-nix-2.4pre20210727_706777a/bin/nix --help' for more information.
+ echo 'warning: error(s) occurred while switching to the new configuration'
warning: error(s) occurred while switching to the new configuration
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Currently fails with:
$ nixos-rebuild test --target-host myhost --use-remote-sudo
building Nix...
sudo: /run/current-system/sw/bin/sudo must be owned by uid 0 and have the setuid bit set
It seems setting an explicit PATH in the ssh command overrides the
remote setuid wrappers.
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There is no logical reason for --fast to imply --show-trace, and this
seems to be a historical accident. Using --show-trace by default is
bad UX since it can give very long error messages (e.g. 550 lines for
a non-existent attribute in environment.systemPackages).
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nixos-rebuild: support prebuilt Nix on aarch64
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We have a fallback hashes entry for aarch64-linux, but it was unused
by nixos-rebuild.
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Make sure that the Nix `experimental-features` set by a user aren’t overwritten when running `nixos-rebuild --flake` by using `--extra-experimental-features` rather than `--experimental-features`.
Fix https://github.com/NixOS/nix/issues/4784
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As of
https://github.com/NixOS/nix/commit/66fa1c7375e4b3073a16df4678cf1d37446ed20b,
the `nix flake info` and `nix flake list-inputs` commands were merged into
`nix flake metadata`.
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nixos-rebuild: Remove ambient systemctl dependency
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The use of systemctl makes this incompatible with darwin even though
building/deploying a nixos closure from darwin is a perfectly valid use case.
NIX_DAEMON is pretty much unnecessary nowadays as nix uses other
indicators for deciding whether to use the daemon or not.
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this fixes the issue when using
nixos-rebuild switch --target-host <target> --use-remote-sudo
when the local machine does not have anything in `$PATH` that would
resolve to `sudo` on the remote machine.
the single quotes prevent expansion of `$PATH` on the local machine,
such that the remote machine's value of that variable is used.
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