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Add test case for catching caching of transient flake evaluation error

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Co-authored-by: Robert Hensing <robert@roberthensing.nl>
This commit is contained in:
Shahar "Dawn" Or 2025-03-21 17:34:11 +00:00
parent 2172c17b5e
commit cee75fbf64
2 changed files with 54 additions and 0 deletions
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34
tests/functional/flakes/eval-cache.sh
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@ -28,6 +28,8 @@ cat >"$flake1Dir/flake.nix" <<EOF
in
assert (f 100); self.drv;
ifd = assert (import self.drv); self.drv;
artificialTwoDifferentThrows = builtins.testThrowErrorMaybe (throw "real throw");
artificialThrowOrDrv = builtins.testThrowErrorMaybe self.drv;
};
}
EOF
@ -48,3 +50,35 @@ nix build --no-link "$flake1Dir#stack-depth"
expect 1 nix build "$flake1Dir#ifd" --option allow-import-from-derivation false 2>&1 \
| grepQuiet 'error: cannot build .* during evaluation because the option '\''allow-import-from-derivation'\'' is disabled'
nix build --no-link "$flake1Dir#ifd"
# make sure this builtin does not reach production
nix eval --expr 'assert ! (builtins ? testThrowErrorMaybe); null'
# and that it does reach the testing environment
export _NIX_TEST_PRIMOPS=1
nix eval --expr 'assert (builtins.testThrowErrorMaybe true); null'
# and that it works
_NIX_TEST_DO_THROW_ERROR=1 expect 1 nix eval --expr 'builtins.testThrowErrorMaybe true' 2>&1 \
| grepQuiet 'this is a dummy error'
# make sure error details do not get cached
_NIX_TEST_DO_THROW_ERROR=1 expect 1 nix eval "$flake1Dir#artificialTwoDifferentThrows" 2>&1 \
| grepQuiet "this is a dummy error"
expect 1 nix eval "$flake1Dir#artificialTwoDifferentThrows" 2>&1 \
| grepQuiet "real throw"
# If a cached error cannot be reproduced, do not continue as usual.
# Instead, throw an error.
#
# To be clear, the following test case should never occur in production.
# But it might, due to an implementation error in Nix or plugins.
# create an artificial exception cache entry
_NIX_TEST_DO_THROW_ERROR=1 expect 1 nix build "$flake1Dir#artificialThrowOrDrv" 2>&1 \
| grepQuiet "this is a dummy error"
# Invoke again but without the artificial throwing of an exception
expect 1 nix build "$flake1Dir#artificialThrowOrDrv" 2>&1 \
| grepQuiet "unexpected evaluation success despite the existence of a cached error. This should not happen. It is a bug in the implementation of Nix or a plugin. A transient exception should not have been cached."