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-rw-r--r--src/libstore/build.cc3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index c970fbdcaa65..eaa9128d8f37 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -2165,7 +2165,8 @@ void DerivationGoal::startBuilder()
                namespace, we can't drop additional groups; they will
                be mapped to nogroup in the child namespace. There does
                not seem to be a workaround for this. (But who can tell
-               from reading user_namespaces(7)?)*/
+               from reading user_namespaces(7)?)
+               See also https://lwn.net/Articles/621612/. */
             if (getuid() == 0 && setgroups(0, 0) == -1)
                 throw SysError("setgroups failed");