btrfs: add function _require_fssum()

To avoid repeating detection of fssum presence in many btrfs tests, as
suggested by Dave Chinner.

Also exported the variable "here" from the main control script, to avoid
repeating its declaration in every single testcase file. Also removed the
declaration of "here" from btrfs test cases that require the fssum program
only. Removing it from all other test cases will be a separate change.

Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

check

@@ -32,7 +32,7 @@ diff="diff -u"
 showme=false
 have_test_arg=false
 randomize=false
-here=`pwd`
+export here=`pwd`
 xfile=""
 
 # start the initialisation work now

common/rc

@@ -2158,6 +2158,12 @@ _require_cp_reflink()
                _notrun "This test requires a cp with --reflink support."
 }
 
+_require_fssum()
+{
+	FSSUM_PROG=$here/src/fssum
+	[ -x $FSSUM_PROG ] || _notrun "fssum not built"
+}
+
 # Given 2 files, verify that they have the same mapping but different
 # inodes - i.e. an undisturbed reflink
 # Silent if so, make noise if not

tests/btrfs/007

@@ -31,7 +31,6 @@ seq=`basename $0`
 seqres=$RESULT_DIR/$seq
 echo "QA output created by $seq"
 
-here=`pwd`
 tmp=`mktemp -d`
 status=1
 
@@ -52,11 +51,9 @@ _need_to_be_root
 _supported_fs btrfs
 _supported_os Linux
 _require_scratch
+_require_fssum
 _require_seek_data_hole
 
-FSSUM_PROG=$here/src/fssum
-[ -x $FSSUM_PROG ] || _notrun "fssum not built"
-
 rm -f $seqres.full
 
 workout()

tests/btrfs/016

@@ -26,7 +26,6 @@ seq=`basename $0`
 seqres=$RESULT_DIR/$seq
 echo "QA output created by $seq"
 
-here=`pwd`
 tmp=`mktemp -d`
 tmp_dir=send_temp_$seq
 
@@ -51,9 +50,7 @@ trap "_cleanup ; exit \$status" 0 1 2 3 15
 _supported_fs btrfs
 _supported_os Linux
 _require_scratch
-
-FSSUM_PROG=$here/src/fssum
-[ -x $FSSUM_PROG ] || _notrun "fssum not built"
+_require_fssum
 
 _scratch_mkfs > /dev/null 2>&1
 

tests/btrfs/030

@@ -36,7 +36,6 @@ seq=`basename $0`
 seqres=$RESULT_DIR/$seq
 echo "QA output created by $seq"
 
-here=`pwd`
 tmp=`mktemp -d`
 status=1	# failure is the default!
 trap "_cleanup; exit \$status" 0 1 2 3 15
@@ -54,11 +53,9 @@ _cleanup()
 _supported_fs btrfs
 _supported_os Linux
 _require_scratch
+_require_fssum
 _need_to_be_root
 
-FSSUM_PROG=$here/src/fssum
-[ -x $FSSUM_PROG ] || _notrun "fssum not built"
-
 rm -f $seqres.full
 
 _scratch_mkfs >/dev/null 2>&1

tests/btrfs/038

@@ -32,7 +32,6 @@ seq=`basename $0`
 seqres=$RESULT_DIR/$seq
 echo "QA output created by $seq"
 
-here=`pwd`
 tmp=`mktemp -d`
 status=1	# failure is the default!
 trap "_cleanup; exit \$status" 0 1 2 3 15
@@ -50,11 +49,9 @@ _cleanup()
 _supported_fs btrfs
 _supported_os Linux
 _require_scratch
+_require_fssum
 _need_to_be_root
 
-FSSUM_PROG=$here/src/fssum
-[ -x $FSSUM_PROG ] || _notrun "fssum not built"
-
 rm -f $seqres.full
 
 _scratch_mkfs >/dev/null 2>&1

tests/btrfs/039

@@ -35,7 +35,6 @@ seq=`basename $0`
 seqres=$RESULT_DIR/$seq
 echo "QA output created by $seq"
 
-here=`pwd`
 tmp=`mktemp -d`
 status=1	# failure is the default!
 trap "_cleanup; exit \$status" 0 1 2 3 15
@@ -53,11 +52,9 @@ _cleanup()
 _supported_fs btrfs
 _supported_os Linux
 _require_scratch
+_require_fssum
 _need_to_be_root
 
-FSSUM_PROG=$here/src/fssum
-[ -x $FSSUM_PROG ] || _notrun "fssum not built"
-
 rm -f $seqres.full
 
 _scratch_mkfs >/dev/null 2>&1

tests/btrfs/040

@@ -35,7 +35,6 @@ seq=`basename $0`
 seqres=$RESULT_DIR/$seq
 echo "QA output created by $seq"
 
-here=`pwd`
 tmp=`mktemp -d`
 status=1	# failure is the default!
 trap "_cleanup; exit \$status" 0 1 2 3 15
@@ -53,11 +52,9 @@ _cleanup()
 _supported_fs btrfs
 _supported_os Linux
 _require_scratch
+_require_fssum
 _need_to_be_root
 
-FSSUM_PROG=$here/src/fssum
-[ -x $FSSUM_PROG ] || _notrun "fssum not built"
-
 rm -f $seqres.full
 
 _scratch_mkfs >/dev/null 2>&1