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A new test, edge-cases, covers paths that work but have no scenario yet:
a flake given by an indirect reference, which the target fetches by its
locked reference; a remote flake in a subdirectory; a flake in a
subdirectory drawing inputs from sources; a dirty Git work tree; a flake
whose lock file needs updating; drawing inputs from a source that isn't
a directory; nested names of missing inputs; several sources sharing one
flake; and an input locked to a path that the target has.
The deploying machine gets a registry entry for the indirect reference.
Resolving it fails if the global registry can't be downloaded, which it
can't in the VM, and disabling the global registry with flake-registry
needs flakes, so the deploying machine enables them, like any deploying
machine using indirect references does. The target doesn't, so checks
for flake support on targets still mean something.
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Several weaknesses let checks pass although the feature under test is
broken:
- Nix restores fetched inputs from its fetcher cache, so evaluating a
delivered flake offline after collecting garbage succeeds even if
populate rooted none of its inputs. nix_eval uses an empty cache
directory.
- Scenarios share target directories and stores, so store paths and roots
of earlier scenarios stand in for missing ones, and uploads of flakes
never run in a passing scenario. Scenarios of the flake, flake-input,
and features tests are isolated now: they start without target
directories and with a collected store on both machines.
- Phases expecting evaluation to fail pass on any evaluation failure,
e.g. a misspelt option. Each such phase has a control now: sources
differing only in what makes evaluation fail, which must evaluate.
Further, populate runs with a time limit, so a hang fails its scenario
instead of the whole test, phases can run steps on the deploying machine
before and after, and evaluating the scenarios fails if the remote
target counts as local for whoever evaluates them.
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For targets using sudo, writeDeploy runs nixos-rebuild on the target via
sudo, so --use-remote-sudo has no effect there. It only matters when
nixos-rebuild runs on a separate build target and activates the system
on the target, so writeDeploy passes it only then.
A new VM test, deploy, runs writeDeploy with a stand-in for
nixos-rebuild, which records the user it runs as, NIX_PATH, and its
arguments, for deploying flakes and other sources, with and without a
separate build target, to every kind of target.
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tests/default.nix provides one VM test per source type, and one for
features spanning sources. Each test runs scenarios from
tests/scenarios.nix, which cover every combination of a source type's
options, deployed to the deploying machine itself, to a remote target as
root, and to a remote target using sudo. A scenario prepares the target
directory, deploys, checks the result, and deploys and checks again.
Scenarios expecting populate to fail check its error message, or check
at evaluation time if populate is expected not to evaluate.
The deploying machine creates fixtures using tests/fixtures.sh and serves
them via HTTP and git daemon, so flakes can be fetched on the target
without further network access. Checks evaluate delivered flakes without
network access to the fixtures after collecting garbage, so they verify
that the delivered store paths are complete and rooted.
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