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Fix testing fixed-output derivations in double sandboxes

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What happened was that Nix was trying to unconditionally mount these
paths in fixed-output derivations, but since the outer derivation was
pure, those paths did not exist. The solution is to only mount those
paths when they exist.
This commit is contained in:
John Ericson 2021-02-27 05:23:14 +00:00
parent 5b42e5b177
commit ae1441e548
1 changed files with 8 additions and 8 deletions
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12
src/libstore/build/local-derivation-goal.cc
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@ -1703,18 +1703,18 @@ void LocalDerivationGoal::runChild()
network, so give them access to /etc/resolv.conf and so
on. */
if (derivationIsImpure(derivationType)) {
ss.push_back("/etc/resolv.conf");
// Only use nss functions to resolve hosts and
// services. Don’t use it for anything else that may
// be configured for this system. This limits the
// potential impurities introduced in fixed-outputs.
writeFile(chrootRootDir + "/etc/nsswitch.conf", "hosts: files dns\nservices: files\n");
ss.push_back("/etc/services");
ss.push_back("/etc/hosts");
if (pathExists("/var/run/nscd/socket"))
ss.push_back("/var/run/nscd/socket");
/* N.B. it is realistic that these paths might not exist. It
happens when testing Nix building fixed-output derivations
within a pure derivation. */
for (auto & path : { "/etc/resolv.conf", "/etc/services", "/etc/hosts", "/var/run/nscd/socket" })
if (pathExists(path))
ss.push_back(path);
}
for (auto & i : ss) dirsInChroot.emplace(i, i);