Closes#9343
See that issue for motivation.
Installing these is disabled by default, but we enable it (and the
additional output we want isntall these too so as not to clutter the
existing ones) to use in cross builds and dev shells.
This adds simple tests of the commit signature verification mechanism of
fetchGit and its flake input wrapper.
OpenSSH is added to the build dependencies since it's needed to create
a key when testing the functionality. It is neither a built- nor a
runtime dependency.
Progress breaking up `flake.nix` by introducing separate `default.nix`
files which make sense on their own. (This one is a regular
`callPackage`-able package.)
Additionally this skipping of the building is reimplemented to be a bit
more robust and use the same idioms as the functionality for skipping
the tests. In particular, it will now work even if the source files
exist, so we can do this during development too.
I think the our `flake.nix` is currently too large and too scary looking.
I think this matters --- if Nix cannot dog-food itself in a way that is
elegant, why should other people have confidence that their own code can
be elegant and easy to maintain?
We could do this at many points in time, but I think around now, when we
are thinking about stabilizing parts of Flakes, is an especially good
time.
This is a first step to make the `flake.nix` smaller, and make
individual components responsible for their own packaging. I hope we can
do this many more follow-ups like it, until the top-level `flake.nix` is
very small and just coordinates between other things.
I think it is bad for these reasons when `tests/` contains a mix of
functional and integration tests
- Concepts is harder to understand, the documentation makes a good
unit vs functional vs integration distinction, but when the
integration tests are just two subdirs within `tests/` this is not
clear.
- Source filtering in the `flake.nix` is more complex. We need to
filter out some of the dirs from `tests/`, rather than simply pick
the dirs we want and take all of them. This is a good sign the
structure of what we are trying to do is not matching the structure
of the files.
With this change we have a clean:
```shell-session
$ git show 'HEAD:tests'
tree HEAD:tests
functional/
installer/
nixos/
```
A couple of tests require building some libraries that depend on Nix,
and assume it to be built locally.
Don't run these if we only want to run the install tests.
This prevents the CI from rebuilding several times Nix (like in
https://github.com/NixOS/nix/actions/runs/6404422275/job/17384964033#step:6:6412), thus removing a fair amount of build time.
Continue with the characterization testing idioms begun in
c70484454f, but this time for unit tests.
Co-authored-by: Andreas Rammhold <andreas@rammhold.de>
Interface has changed upstream.
It *should* be fine to test 23.05's other Nix versions as those
*should* succeed, but that's not the case and it's obfuscating
our terrible CI setup's log.
Source filtering is a really cool Nix feature that lets us avoid a
lot of rebuilds, which speeds up the iteration cycle a lot in cases
where the relevant source files aren't actually modified.
We used to have a source filter that marked a few files as irrelevant,
but this is the wrong approach, as we have many more files that are
irrelevant. We may call this negative filtering.
This commit switches the source filtering to positive filtering, which
is a lot more robust. Instead of marking which files we don't need
we marked the files that we do need.
It's a superior approach because it is fail safe. Instead of allowing
build performance problems to creep in over time, we require that all
source inputs are declared.
I shouldn't have to explain that declaring inputs is a good practice,
so I'll stop over-explaining here.
I do have to acknowledge that this will cause a build failure when the
filter is incomplete. This is *good*, because it's the only realistic
way we could be reminded of these problems. These events will be
infrequent, so the small cost of extending the filter is worth it,
compared to the hidden cost of longer dev cycles for things like tests,
docker image, etc, etc.
(Also rebuilding Nix for stupid unnecessary reasons makes my blood boil)
Previously, for tarball flakes, we recorded the original URL of the
tarball flake, rather than the URL to which it ultimately
redirects. Thus, a flake URL like
http://example.org/patchelf-latest.tar that redirects to
http://example.org/patchelf-<revision>.tar was not really usable. We
couldn't record the redirected URL, because sites like GitHub redirect
to CDN URLs that we can't rely on to be stable.
So now we use the redirected URL only if the server returns the
`x-nix-is-immutable` or `x-amz-meta-nix-is-immutable` headers in its
response.
