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Handle gc-keep-outputs and gc-keep-derivations both enabled

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If the options gc-keep-outputs and gc-keep-derivations are both
enabled, you can get a cycle in the liveness graph.  There was a hack
to handle this, but it didn't work with multiple-output derivations,
causing the garbage collector to fail with errors like ‘error: cannot
delete path `...' because it is in use by `...'’.  The garbage
collector now handles strongly connected components in the liveness
graph as a unit and decides whether to delete all or none of the paths
in an SCC.
This commit is contained in:
Eelco Dolstra 2012-09-12 18:49:35 -04:00
parent 479e9172b3
commit 4fca02077c
2 changed files with 101 additions and 96 deletions
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4
tests/multiple-outputs.sh
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@ -55,4 +55,6 @@ if nix-build multiple-outputs.nix -A cyclic --no-out-link; then
fi
echo "collecting garbage..."
nix-store --gc
rm $TEST_ROOT/result*
nix-store --gc --option gc-keep-derivations true --option gc-keep-outputs true
nix-store --gc --print-roots