[blivet:master 11/14] Add a method to extract information about an mdraid array
mulhern
amulhern at redhat.com
Wed Jul 16 16:56:42 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 | 33 +++++++++++++++++++++++++++++++++
1 file changed, 33 insertions(+)
diff --git a/blivet/devicelibs/mdraid.py b/blivet/devicelibs/mdraid.py
index 2f0ac86..83f87cf 100644
--- a/blivet/devicelibs/mdraid.py
+++ b/blivet/devicelibs/mdraid.py
@@ -21,6 +21,7 @@
#
import os
+import re
import uuid
from .. import util
@@ -286,6 +287,38 @@ 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.
+
+ :param str device: path of the array device
+ :rtype: a dict of strings
+ :returns: a dict containing labels and values extracted from output
+ """
+ lines = mdadm(["--detail", device], capture=True).split("\n")
+ info = {}
+ for (name, colon, value) in (line.strip().partition(":") for line in lines):
+ value = value.strip()
+ name = name.strip().upper()
+ if colon and value and name:
+ info[name] = value
+
+ for k, v in ((k,info[k]) for k in ('UUID',) if k in info):
+ try:
+ # extract the UUID proper
+ the_uuid = re.match(r"(([a-f0-9]){8}:){3}([a-f0-9]){8}", v)
+ info[k] = canonicalizeUUID(the_uuid.group())
+ except (ValueError, AttributeError) as e:
+ log.warning('uuid value %s could not be canonicalized: %s', v, e)
+ info[k] = v # record the value, since mdadm provided something
+
+ return info
+
def md_node_from_name(name):
named_path = "/dev/md/" + name
try:
--
1.9.3
More information about the anaconda-patches
mailing list