https://git.savannah.gnu.org/cgit/rcs.git/commit/?h=p&id=5df4567e69fc7f46d14cfbf396525c3d05bcf970
https://bugs.gentoo.org/820230

From: Thien-Thi Nguyen <ttn@gnu.org>
Date: Sat, 24 Oct 2020 19:14:26 -0400
Subject: [v] Try to handle whoami(1) returning no info.
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* tests/t808 (user): If whoami(1) returns no info, no longer error out.
Instead, jam a value, and set env vars ‘LOGNAME’ and ‘USER’, as well.
--- a/tests/t808
+++ b/tests/t808
@@ -24,8 +24,14 @@ rerr=$wd/rerr
 
 user=`whoami`
 
-test "$user" \
-    || problem 'far out, man ... whoami failed!'
+if ! test "$user" ; then
+   : 'far out, man ... whoami failed!'
+   user=jrluser
+   USER=$user
+   export USER
+   LOGNAME=$user
+   export LOGNAME
+fi
 
 must 'sed -e s/ttn/trulynobody/g \
           -e s/zurg/$user/g      \
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