[blivet:master 6/8] Add a method to extract information about an mdraid array

mulhern amulhern at redhat.com
Fri Jul 25 16:39:25 UTC 2014


mdadm --detail can give useful information about the number of spare devices
and other things that mdadm --examine can not. According to the man page
--examine applies to devices which are components of an array, while --detail
applies to a whole array which is currently active.

Signed-off-by: mulhern <amulhern at redhat.com>
---
 blivet/devicelibs/mdraid.py | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/blivet/devicelibs/mdraid.py b/blivet/devicelibs/mdraid.py
index af04aa2..a2745b6 100644
--- a/blivet/devicelibs/mdraid.py
+++ b/blivet/devicelibs/mdraid.py
@@ -21,6 +21,7 @@
 #
 
 import os
+import re
 import uuid
 
 from .. import util
@@ -269,6 +270,35 @@ def mdexamine(device):
 
     return info
 
+def mddetail(device):
+    """Run mdadm --detail in order to read information about an array.
+
+       Note: The --export flag is not used. According to the man pages
+       the export flag just formats the output as key=value pairs for
+       easy import, but in the case of --detail it also omits the majority
+       of the information, including information of real use like the
+       number of spares in the array.
+
+       :rtype: a dict of strings
+       :returns: a dict containing labels and values extracted from output
+    """
+    lines = util.capture_output(["mdadm", "--detail", device]).split("\n")
+    info = {}
+    for (name, equals, value) in (line.strip().partition(":") for line in lines):
+        if equals and value.strip():
+            name = name.strip().upper()
+            value = value.strip()
+
+            info[name] = value
+
+    # extract the UUID proper
+    the_uuid = re.match(r"(([a-f0-9]){8}:){3}([a-f0-9]){8}", info['UUID'])
+
+    # canonicalize the extracted UUID
+    info['UUID'] = canonicalizeUUID(the_uuid.group())
+
+    return info
+
 def md_node_from_name(name):
     named_path = "/dev/md/" + name
     try:
-- 
1.9.3



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