ls --color: Don't stat symlinks when neither ORPHAN nor MISSING attribute has a color.

* src/ls.c (main): Don't set check_symlink_color when C_EXEC is
colored, unless ln=target (aka color_symlink_as_referent) is set.
(gobble_file): Set f->linkok = true also when !check_symlink_color.
http://thread.gmane.org/gmane.comp.gnu.coreutils.bugs/10608/focus=10927
Reported by Jeremy Maitin-Shepard.
* tests/strace: New file, contents extracted from...
* tests/mv/atomic: ...here.  Source strace.
* tests/ls/stat-free-symlinks: New file.  Test for the above.
Use strace to ensure that in this corner case, ls does not call stat.
* tests/ls/Makefile.am (TESTS): Add stat-free-symlinks.
* tests/Makefile.am (EXTRA_DIST): Add strace.

1 files changed, 2 insertions, 13 deletions

diff --git a/tests/mv/atomic b/tests/mv/atomic
index 2b49fdeb7..69374b984 100755
--- a/tests/mv/atomic
+++ b/tests/mv/atomic
@@ -23,6 +23,8 @@ if test "$VERBOSE" = yes; then
   mv --version
 fi
 
+. $srcdir/../strace
+
 pwd=`pwd`
 t0=`echo "$0"|sed 's,.*/,,'`.tmp; tmp=$t0/$$
 trap 'status=$?; cd "$pwd" && chmod -R u+rwx $t0 && rm -rf $t0 && exit $status' 0
@@ -48,19 +50,6 @@ if test $framework_failure = 1; then
   (exit 1); exit 1
 fi
 
-# Skip this test on systems without strace.
-strace -V < /dev/null > ver 2>&1 || skip=1
-if test "$skip" = 1; then
-  echo "$0: no strace program, so skipping this test" 1>&2
-  (exit 77); exit 77
-fi
-
-strace -qe unlink echo > /dev/null 2>&1 || skip=1
-if test "$skip" = 1; then
-  echo "$0: strace doesn't work, so skipping this test" 1>&2
-  (exit 77); exit 77
-fi
-
 fail=0
 
 strace -qe unlink mv -T s1 s2 > out 2>&1 || fail=1