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-rw-r--r--src/libstore/build/local-derivation-goal.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libstore/build/local-derivation-goal.cc b/src/libstore/build/local-derivation-goal.cc
index 6d2d458da..a50fe1a28 100644
--- a/src/libstore/build/local-derivation-goal.cc
+++ b/src/libstore/build/local-derivation-goal.cc
@@ -910,7 +910,7 @@ void LocalDerivationGoal::startBuilder()
after we've created the new user namespace. */
if (settings.dropSupplementaryGroups)
if (setgroups(0, 0) == -1)
- throw SysError("setgroups failed");
+ throw SysError("setgroups failed. Set the drop-supplementary-groups option to false to skip this step.");
ProcessOptions options;
options.cloneFlags = CLONE_NEWPID | CLONE_NEWNS | CLONE_NEWIPC | CLONE_NEWUTS | CLONE_PARENT | SIGCHLD;