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source common.sh
$NIX_BIN_DIR/nix-collect-garbage -vvvvv
drvPath1=$($nixinstantiate gc-concurrent.nix)
outPath1=$($nixstore -q $drvPath1)
drvPath2=$($nixinstantiate gc-concurrent2.nix)
outPath2=$($nixstore -q $drvPath2)
rm -f "$NIX_STATE_DIR"/gcroots/foo
ln -s $drvPath2 "$NIX_STATE_DIR"/gcroots/foo
# Start build #1 in the background. It starts immediately.
$nixstore -rvv "$drvPath1" &
pid1=$!
# Start build #2 in the background after 6 seconds.
(sleep 6 && $nixstore -rvv "$drvPath2") &
pid2=$!
# Run the garbage collector while the build is running.
sleep 4
$NIX_BIN_DIR/nix-collect-garbage -vvvvv
# Wait for build #1/#2 to finish.
echo waiting for pid $pid1 to finish...
wait $pid1
echo waiting for pid $pid2 to finish...
wait $pid2
# Check that the root of build #1 and its dependencies haven't been
# deleted. The should not be deleted by the GC because they were
# being built during the GC.
cat $outPath1/foobar
cat $outPath1/input-2/bar
# Check that build #2 has succeeded. It should succeed because the
# derivation is a GC root.
cat $outPath2/foobar
rm "$NIX_STATE_DIR"/gcroots/foo
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