[PATCH v2] common/rc: fix MKSWAP_PROG quoting

[Murphy Zhou <xzhou@redhat.com>]

After commit
  0e4dd8b9 common/rc: fix ignoring of errors on
we are getting this error message when running swapfiles tests:
  +./common/rc: line 2553: MKSWAP_PROG: command not found

Rewrite the line and add a filter for mkswap.

Signed-off-by: Murphy Zhou <xzhou@redhat.com>
---

Thanks all for the suggestions!

v2:
  rewrite the line and add a filter
  source filters for generic/643

 common/filter     | 6 ++++++
 common/rc         | 2 +-
 tests/generic/643 | 1 +
 3 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/common/filter b/common/filter
index 2efbbd99..0883a3fd 100644
--- a/common/filter
+++ b/common/filter
@@ -661,5 +661,11 @@ _filter_quota_report()
 		s|^(.*?) (\d+) (\d+) (\d+)|$1 @{[$2 * 1024 /'$bsize']} @{[$3 * 1024 /'$bsize']} @{[$4 * 1024 /'$bsize']}|'
 }
 
+# Filter mkswap warning about the permissions
+_filter_mkswap_stderr()
+{
+	grep -v "insecure permission"
+}
+
 # make sure this script returns success
 /bin/true
diff --git a/common/rc b/common/rc
index 46b6b220..0a3933a5 100644
--- a/common/rc
+++ b/common/rc
@@ -2550,7 +2550,7 @@ _format_swapfile() {
 	$CHATTR_PROG +C "$fname" > /dev/null 2>&1
 	_pwrite_byte 0x61 0 "$sz" "$fname" >> $seqres.full
 	# Ignore permission complaints on filesystems that don't support perms
-	$(MKSWAP_PROG "$fname" 2> >(grep -v 'insecure permission' >&2)) >> $seqres.full
+	$MKSWAP_PROG "$fname" 2>&1 >> $seqres.full | _filter_mkswap_stderr
 }
 
 _swapon_file() {
diff --git a/tests/generic/643 b/tests/generic/643
index 2bb9d220..9b067ea2 100755
--- a/tests/generic/643
+++ b/tests/generic/643
@@ -21,6 +21,7 @@ _cleanup()
 	rm -f $tmp.*
 	test -n "$swapfile" && swapoff $swapfile &> /dev/null
 }
+. ./common/filter
 
 # real QA test starts here
 _supported_fs generic
-- 
2.20.1