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Make nix why-depends quieter by default

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Unless `--precise` is passed, make `nix why-depends` only show the
dependencies between the store paths, without introspecting them to
find the actual references.

This also makes it ~3x faster
This commit is contained in:
regnat 2022-01-19 14:15:45 +01:00
parent 2ad2678c0b
commit dd7c2e0695
4 changed files with 34 additions and 11 deletions
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12
tests/why-depends.sh
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@ -9,5 +9,13 @@ cd $TEST_HOME
nix-build ./dependencies.nix -A input0_drv -o dep
nix-build ./dependencies.nix -o toplevel
nix why-depends ./toplevel ./dep |
grep input-2
FAST_WHY_DEPENDS_OUTPUT=$(nix why-depends ./toplevel ./dep)
PRECISE_WHY_DEPENDS_OUTPUT=$(nix why-depends ./toplevel ./dep --precise)
# Both outputs should show that `input-2` is in the dependency chain
echo "$FAST_WHY_DEPENDS_OUTPUT" | grep -q input-2
echo "$PRECISE_WHY_DEPENDS_OUTPUT" | grep -q input-2
# But only the “precise” one should refere to `reference-to-input-2`
echo "$FAST_WHY_DEPENDS_OUTPUT" | (! grep -q reference-to-input-2)
echo "$PRECISE_WHY_DEPENDS_OUTPUT" | grep -q reference-to-input-2