[PATCH 1/2] common/rc: helper functions to handle block devices via sysfs

[Anand Jain <anajain.sg@gmail.com>]

From: Anand Jain <anand.jain@oracle.com>

_bdev_handle(dev)
	get sysfs handle for a given block device.

_has_bdev_sysfs_delete(dev_path)
	Checks if the block device supports sysfs-based delete.

_require_scratch_bdev_delete()
	Test if the scratch device does not support sysfs delete.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
---
 common/rc | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/common/rc b/common/rc
index 81587dad500c..627ddcc02fb8 100644
--- a/common/rc
+++ b/common/rc
@@ -4388,6 +4388,32 @@ _get_file_extent_sector()
 	echo "$result"
 }
 
+_bdev_handle()
+{
+	local device=$(echo $1 | rev | cut -d"/" -f1 | rev)
+
+	test -e /sys/class/block/${device}/device/scsi_disk/ || \
+			_notrun "Failed to obtain sys block handle"
+
+	ls /sys/class/block/${device}/device/scsi_disk/
+}
+
+_has_bdev_sysfs_delete()
+{
+	local dev_path=$1
+	local device=$(echo $dev_path | rev | cut -d"/" -f1 | rev)
+	local delete_path=/sys/class/block/${device}/device/delete
+
+	test -e $delete_path
+}
+
+_require_scratch_bdev_delete()
+{
+	if ! _has_bdev_sysfs_delete $SCRATCH_DEV; then
+		_notrun "require scratch device sys delete support"
+	fi
+}
+
 # arg 1 is dev to remove and is output of the below eg.
 # ls -l /sys/class/block/sdd | rev | cut -d "/" -f 3 | rev
 _devmgt_remove()
-- 
2.51.0