tests: use predetermined NON_ROOT_GID

* HACKING: GID is more useful in tests than group name, so rename
input param from NON_ROOT_GROUP to NON_ROOT_GID to make it obvious
that only a group ID is now acceptable, thus allowing GID lookups
to be avoided throughout the tests.
* init.cfg (require_root_): Likewise.
* tests/misc/truncate-owned-by-other.sh: Avoid looking up the GID.
* tests/touch/now-owned-by-other.sh: Likewise.
* tests/misc/chroot-credentials.sh: Likewise.  Also fix an instance
of comparison against NON_ROOT_GROUP which would have given a false
failure if a non numeric value was passed in.
* tests/id/setgid.sh: Use previously looked up gid as a more
accurate base for the subsequent adjustment, and move
the uid lookup within chroot, rather than having the overhead
of a separate `id` invocation.

1 files changed, 9 insertions, 10 deletions

diff --git a/tests/id/setgid.sh b/tests/id/setgid.sh
index 0664c47a2..6d9d74f43 100755
--- a/tests/id/setgid.sh
+++ b/tests/id/setgid.sh
@@ -20,21 +20,20 @@
 print_ver_ id
 require_root_
 
-u=$(id -u $NON_ROOT_USERNAME) || framework_failure_
-g=$u
-
-# Construct a different group number.
-gp1=$(expr $g + 1)
+# Construct a different group number
+gp1=$(expr $NON_ROOT_GID + 1)
 
 echo $gp1 > exp || framework_failure_
 
-# With coreutils-8.16 and earlier, id -G would print both: $gp1 $g
-chroot --user=+$u:+$gp1 --groups='' / env PATH="$PATH" \
+# With coreutils-8.16 and earlier, id -G would print both:
+#  $gp1 $NON_ROOT_GID
+chroot --user=$NON_ROOT_USERNAME:+$gp1 --groups='' / env PATH="$PATH" \
   id -G > out || fail=1
-compare exp out || { cat out; fail=1; }
+compare exp out || fail=1
 
-# With coreutils-8.22 and earlier, id would erroneously print groups=$g
-chroot --user=+$u:+$gp1 --groups='' / env PATH="$PATH" \
+# With coreutils-8.22 and earlier, id would erroneously print
+#  groups=$NON_ROOT_GID
+chroot --user=$NON_ROOT_USERNAME:+$gp1 --groups='' / env PATH="$PATH" \
   id > out || fail=1
 grep -F "groups=$gp1" out || { cat out; fail=1; }