[PATCH 1/3] xfstests: Fix SCRATCH_DEV_POOL handling

[Lukas Czerner]

With changes introduced in 667308dd97bf41382d4ab299fa5b56c235cfeb27
it is no longer possible to use SCRATCH_DEV_POOL variable because of
error:

 common/config: Error: $SCRATCH_DEV should be unset when
 $SCRATCH_DEV_POOL is set

This was because get_next_config() would get called twice and hence it
would complain on the second run that SCRATCH_DEV is already set. Fix
it by making sure that we call get_next_config() only once if there
are no sections in the config file.

Also make sure that we export SCRATCH_DEV in the case we're deducing it
from SCRATCH_DEV_POOL.

Signed-off-by: Lukas Czerner <lczerner at redhat.com>
Reported-by: Filipe David Manana <fdmanana at gmail.com>
---
 common/config | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/common/config b/common/config
index 4178c27..6fa18e2 100644
--- a/common/config
+++ b/common/config
@@ -360,6 +360,10 @@ parse_config_section() {
 }
 
 get_next_config() {
+	if [ ! -z "$CONFIG_INCLUDED" ] && ! $OPTIONS_HAVE_SECTIONS; then
+		return 0
+	fi
+
 	local OLD_FSTYP=$FSTYP
 	local OLD_MOUNT_OPTIONS=$MOUNT_OPTIONS
 	local OLD_MKFS_OPTIONS=$MKFS_OPTIONS
@@ -414,10 +418,11 @@ get_next_config() {
 	# to SCRATCH_DEV and rest to SCRATCH_DEV_POOL to maintain the backward compatibility
 	if [ ! -z "$SCRATCH_DEV_POOL" ]; then
 		if [ ! -z "$SCRATCH_DEV" ]; then
-			echo "common/config: Error: \$SCRATCH_DEV should be unset when \$SCRATCH_DEV_POOL is set"
+			echo "common/config: Error: \$SCRATCH_DEV ($SCRATCH_DEV) should be unset when \$SCRATCH_DEV_POOL ($SCRATCH_DEV_POOL) is set"
 			exit 1
 		fi
 		SCRATCH_DEV=`echo $SCRATCH_DEV_POOL | awk '{print $1}'`
+		export SCRATCH_DEV
 	fi
 
 	echo $SCRATCH_DEV | grep -q ":" > /dev/null 2>&1
-- 
1.8.3.1