lix/tests/fixed.sh
Maximilian Bosch bb1a851bcf
build: also throw hash-mismatch errors if buildMode == bmCheck
This actually bit me quite recently in `nixpkgs` because I assumed that
`nix-build --check` would also error out if hashes don't match anymore[1]
and so I wrongly assumed that I couldn't reproduce the mismatch error.

The fix is rather simple, during the output registration a so-called
`delayedException` is instantiated e.g. if a FOD hash-mismatch occurs.
However, in case of `nix-build --check` (or `--rebuild` in case of `nix
build`), the code-path where this exception is thrown will never be
reached.

By adding that check to the if-clause that causes an early exit in case
of `bmCheck`, the issue is gone. Also added a (previously failing)
test-case to demonstrate the problem.

[1] https://github.com/NixOS/nixpkgs/pull/139238, the underlying issue
    was that `nix-prefetch-git` returns different hashes than `fetchgit`
    because the latter one fetches submodules by default.
2021-09-27 15:44:39 +02:00

59 lines
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source common.sh
clearStore
path=$(nix-store -q $(nix-instantiate fixed.nix -A good.0))
echo 'testing bad...'
nix-build fixed.nix -A bad --no-out-link && fail "should fail"
# Building with the bad hash should produce the "good" output path as
# a side-effect.
[[ -e $path ]]
nix path-info --json $path | grep fixed:md5:2qk15sxzzjlnpjk9brn7j8ppcd
echo 'testing good...'
nix-build fixed.nix -A good --no-out-link
if isDaemonNewer "2.4pre20210927"; then
echo 'testing --check...'
nix-build fixed.nix -A check --check && fail "should fail"
fi
echo 'testing good2...'
nix-build fixed.nix -A good2 --no-out-link
echo 'testing reallyBad...'
nix-instantiate fixed.nix -A reallyBad && fail "should fail"
# While we're at it, check attribute selection a bit more.
echo 'testing attribute selection...'
test $(nix-instantiate fixed.nix -A good.1 | wc -l) = 1
# Test parallel builds of derivations that produce the same output.
# Only one should run at the same time.
echo 'testing parallelSame...'
clearStore
nix-build fixed.nix -A parallelSame --no-out-link -j2
# Fixed-output derivations with a recursive SHA-256 hash should
# produce the same path as "nix-store --add".
echo 'testing sameAsAdd...'
out=$(nix-build fixed.nix -A sameAsAdd --no-out-link)
# This is what fixed.builder2 produces...
rm -rf $TEST_ROOT/fixed
mkdir $TEST_ROOT/fixed
mkdir $TEST_ROOT/fixed/bla
echo "Hello World!" > $TEST_ROOT/fixed/foo
ln -s foo $TEST_ROOT/fixed/bar
out2=$(nix-store --add $TEST_ROOT/fixed)
[ "$out" = "$out2" ]
out3=$(nix-store --add-fixed --recursive sha256 $TEST_ROOT/fixed)
[ "$out" = "$out3" ]
out4=$(nix-store --print-fixed-path --recursive sha256 "1ixr6yd3297ciyp9im522dfxpqbkhcw0pylkb2aab915278fqaik" fixed)
[ "$out" = "$out4" ]