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Properly lock the builds of CA derivations

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Make sure that we can’t build the same derivation twice at the same
time.

Fix https://github.com/NixOS/nix/issues/5029
This commit is contained in:
regnat 2021-07-20 06:57:56 +02:00
parent 1af3f63be5
commit 8707773965
4 changed files with 42 additions and 2 deletions
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18
tests/ca/concurrent-builds.sh Executable file
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@ -0,0 +1,18 @@
#!/usr/bin/env bash
# Ensure that we can’t build twice the same derivation concurrently.
# Regression test for https://github.com/NixOS/nix/issues/5029
source common.sh
sed -i 's/experimental-features .*/& ca-derivations ca-references/' "$NIX_CONF_DIR"/nix.conf
export NIX_TESTS_CA_BY_DEFAULT=1
clearStore
for i in {0..5}; do
nix build --no-link --file ./racy.nix &
done
wait