Do not depend on readlink(1) or -q

Solaris 10 lacks readlink(1). Additionally, its different grep(1) and
diff(1) do not take a `-q` flag.

Use a Perl one-liner instead of readlink(1) which is missing on Solaris 10.
Also because /usr/bin/grep and diff(1) don't understand the `-q` option, make
them go quiet by redirecting stdout to `/dev/null` instead.

The Perl dependency only exists in the test suite, so it does not incur
a runtime penalty for end users.

This is to work around the fact that readlink(1) is missing on Solaris.
The tradeoff is: on Solaris, installing third-party software (readlink)
is a pain, whereas on e.g. FreeBSD installing third-party software
(Perl) is simple and common.

1 files changed, 2 insertions, 2 deletions

diff --git a/bin/rcup.in b/bin/rcup.in
index f818258..bdae664 100755
--- a/bin/rcup.in
+++ b/bin/rcup.in
@@ -123,11 +123,11 @@ replace_file() {
 }
 
 is_nested() {
-  echo "$1" | sed "s:$DEST_DIR/::" | grep -q '/'
+  echo "$1" | sed "s:$DEST_DIR/::" | grep '/' >/dev/null
 }
 
 is_identical() {
-  diff -q -s "$1" "$2" > /dev/null
+  diff -c "$1" "$2" > /dev/null 2>&1
 }
 
 handle_dir() {