ceph-disk: Reporting /sys directory in get_partition_dev()

When get_partition_dev() fails, it reports the following message :
    ceph_disk.main.Error: Error: partition 2 for /dev/sdb does not appear to exist
The code search for a directory inside the /sys/block/get_dev_name(os.path.realpath(dev)).

The issue here is the error message doesn't report that path when failing while it might be involved in.

This patch is about reporting where the code was looking at when trying to estimate if the partition was available.

Signed-off-by: Erwan Velu <erwan@redhat.com>

diff --git a/src/ceph-disk/ceph_disk/main.py b/src/ceph-disk/ceph_disk/main.py
index 4a5e1af518a7b4bc58134baf248bba0aba48e480..96676997f0c1aa85813079245a2ec63eea7e1f10 100755 (executable)
--- a/src/ceph-disk/ceph_disk/main.py
+++ b/src/ceph-disk/ceph_disk/main.py
@@ -689,11 +689,14 @@ def get_partition_dev(dev, pnum):
        cciss/c0d1 1 -> cciss!c0d1p1
     """
     partname = None
+    error_msg = ""
     if is_mpath(dev):
         partname = get_partition_mpath(dev, pnum)
     else:
         name = get_dev_name(os.path.realpath(dev))
-        for f in os.listdir(os.path.join('/sys/block', name)):
+        sys_entry = os.path.join('/sys/block', name)
+        error_msg = " in %s" % sys_entry
+        for f in os.listdir(sys_entry):
             if f.startswith(name) and f.endswith(str(pnum)):
                 # we want the shortest name that starts with the base name
                 # and ends with the partition number
@@ -702,8 +705,8 @@ def get_partition_dev(dev, pnum):
     if partname:
         return get_dev_path(partname)
     else:
-        raise Error('partition %d for %s does not appear to exist' %
-                    (pnum, dev))
+        raise Error('partition %d for %s does not appear to exist%s' %
+                    (pnum, dev, error_msg))
 
 
 def list_all_partitions():