'nix build' is an experimental command so we shouldn't use it
yet. (nixos-rebuild also uses 'nix', but only when using flakes, which
are themselves an experimental feature.)
nix build should store it's temporary files on target filesystem.
This should fix 'No space left on device' on systems
with low amount of RAM when there is a need to build something
like Linux kernel
For imports, it is better to use ‘modulesPath’ than rely on <nixpkgs>
being correctly set. Some users may not have <nixpkgs> set correctly.
In addition, when ‘pure-eval=true’, <nixpkgs> is unset.
When trying to build a VM using `nixos-build-vms` with a configuration
that doesn't evaluate, an error "at `<unknown-file>`" is usually shown.
This happens since the `build-vms.nix` creates a VM-network of
NixOS-configurations that are attr-sets or functions and don't contain
any file information. This patch manually adds the `_file`-attribute to
tell the module-system which file contained broken configuration:
```
$ cat vm.nix
{ vm.invalid-option = 1; }
$ nixos-build-vms vm.nix
error: The option `invalid-option' defined in `/home/ma27/Projects/nixpkgs/vm.nix@node-vm' does not exist.
(use '--show-trace' to show detailed location information)
```
Instead of making the configuration less portable by hard coding the number of
jobs equal to the cores we can also let nix set the same number at runtime.
In 0945178b3c we decided that Perl-based
VM tests should be deprecated and will be removed between 20.03 and
20.09. So let's switch `nixos-build-vms(8)` to python as well (which is
entirely interactive, so other scripts won't break).
In my experience, the test-driver isn't used most of the time, so this
patch is mainly supposed to get rid of the (probably misleading)
deprecation warning when running `nixos-build-vms`. Apart from that, the
interface for python's test-driver is way nicer.
In some cases, /dev/stderr may not point to a sensible location. For
example, running nixos-enter inside a systemd unit where the unit's
StandardOutput and StandardError are set to be sockets. In these
cases, this line would fail.
Piping to fd2 directly works just as well, even under strange and
twisted executions.
Co-authored-by: Michael Bishop <michael.bishop@iohk.io>
"master" is not a valid SHA-1 commit hash, and it's not even
necessarily the branch used. 'nixos-version --revision' now returns an
error if the commit hash is not known.
When installing a fresh NixOS system it occasionally happens that you
encounter issues that are rather hard to track down since
`nixos-install(8)` doesn't provide any debugging flags.
This patch adds `-L` to force `nix build` to display the build-log on
stderr and `-v` to increase the log-level of Nix.
1. This makes aggregates of submodules (including the very important
"nixos-option users.users.<username>" case) behave the same way as any
other you-need-to-keep-typing-to-get-to-an-option-leaf (eg:
"nixos-option environment").
Before e0780c5:
$ nixos-option users.users.root
error: At 'root' in path 'users.users.root': Attribute not found
An error occurred while looking for attribute names. Are you sure that 'users.users.root' exists?
After e0780c5 but before this change, this query just printed out a raw
thing, which is behavior that belongs in "nix eval", "nix-instantiate
--eval", or "nix repl <<<":
$ nixos-option users.users.root
{
_module = {
args = { name = "root"; };
check = true;
};
createHome = false;
cryptHomeLuks = null;
description = "System administrator";
...
After this change:
$ nixos-option users.users.root
This attribute set contains:
createHome
cryptHomeLuks
description
extraGroups
group
hashedPassword
...
2. For aggregates of other types (not submodules), print out the option
that contains them rather than printing an error message.
Before:
$ nixos-option environment.shellAliases.l
error: At 'l' in path 'environment.shellAliases.l': Attribute not found
An error occurred while looking for attribute names. Are you sure that 'environment.shellAliases.l' exists?
After:
$ nixos-option environment.shellAliases.l
Note: showing environment.shellAliases instead of environment.shellAliases.l
Value:
{
l = "ls -alh";
ll = "ls -l";
ls = "ls --color=tty";
}
...
When running e.g. `nixos-option users.users.ma27`, the evaluation breaks
since `ma27` is the attribute name in `attrsOf (submodule {})`, but not
a part of the option tree and therefore breaks with the following
errors:
```
error: At 'ma27' in path 'users.users.ma27': Attribute not found
An error occurred while looking for attribute names. Are you sure that 'users.users.ma27' exists?
```
This happens since the option evaluator expects that either the option
exists or the option is a submodule and the "next" token in the
attribute path points to an option (e.g. `users.users.ma27.createHome`).
This patch checks in the `Attribute not found` condition if the attribute-path
actually exists in the config tree. If that's true, a dummy-attrset is created
which contains `{_type = "__nixos-option-submodule-attr";}`, in that case, the
entire entry of the submodule will be displayed.
Add --use-remote-sudo option. When set, remote commands will be prefixed
with 'sudo'. This allows using sudo remotely _without_ having to use
sudo locally (when using --build-host/--taget-host).
Automated consumers can use 'sed 1d' or similar to remove this header.
This probably makes this output *easier* to consume correctly. Having
this header show up in consumers' terminal or log output is probably not
useful, but hiding it without hiding all error messages would have been
more troublesome that just stripping it from stdout.
I.e., previously, unsophisticated use would show undesired output:
$ some-other-tool
This attribute set contains:
This attribute set contains:
This attribute set contains:
This attribute set contains:
<Actual some-other-tool output>
The simplest way to hide this undesired output would have been
nixos-option ... 2>/dev/null, which would hide all error messages.
We do not wish to encourage that.
Correct use would have been something like:
nixos-option ... 2> >( grep --line-buffered -v 'This attribute set contains:')
After this change, correct use is simpler:
nixos-option ... | sed 1d
or
nixos-option ... | sed '1/This attribute set contains:/d'
if the caller don't know if this invocation of nixos-option will yield
an attribute listing or an option description.
