parent-perm: avoid a bizarre test failure.

* tests/cp/parent-perm: Accommodate the situation in which
chmod ("dir", 02755) returns 0 yet fails to set the S_ISGID bit.

1 files changed, 10 insertions, 1 deletions

diff --git a/tests/cp/parent-perm b/tests/cp/parent-perm
index 1c7a222bb..cedcac4df 100755
--- a/tests/cp/parent-perm
+++ b/tests/cp/parent-perm
@@ -33,6 +33,15 @@ cp -p --parent a/b/d/foo e || fail=1
 
 # Ensure that permissions on just-created directory, e/a/,
 # are the same as those on original, a/.
-test $(stat --printf %A a) = $(stat --printf %A e/a) || fail=1
+
+# The sed filter maps any 's' from an inherited set-GID bit
+# to the usual 'x'.  Otherwise, under unusual circumstances, this
+# test would fail with e.g., drwxr-sr-x != drwxr-xr-x .
+# For reference, the unusual circumstances is: build dir is set-gid,
+# so "a/" inherits that.  However, when the user does not belong to
+# the group of the build directory, chmod ("a/e", 02755) returns 0,
+# yet fails to set the S_ISGID bit.
+test $(stat --printf %A a|sed s/s/x/g) = $(stat --printf %A e/a|sed s/s/x/g) ||
+  fail=1
 
 (exit $fail); exit $fail