Merge pull request #2975 from matthewbauer/fix-nsswitch-issue

Don’t use entire /etc/nsswitch.conf file

1 files changed, 7 insertions, 1 deletions

diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index 350ac4092854..cf6428e12467 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -2734,7 +2734,13 @@ void DerivationGoal::runChild()
                on. */
             if (fixedOutput) {
                 ss.push_back("/etc/resolv.conf");
-                ss.push_back("/etc/nsswitch.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"))