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Old 12-13-2011, 09:58 PM
David Lehman
 
Default Handle device name generation and checking in a more generic way.

---
pyanaconda/storage/__init__.py | 141 ++++++++++++++++++++--------------
pyanaconda/storage/devicelibs/lvm.py | 15 ----
pyanaconda/storage/devicetree.py | 21 +++++-
3 files changed, 102 insertions(+), 75 deletions(-)

diff --git a/pyanaconda/storage/__init__.py b/pyanaconda/storage/__init__.py
index 6c51c63..b38ac21 100644
--- a/pyanaconda/storage/__init__.py
+++ b/pyanaconda/storage/__init__.py
@@ -44,7 +44,6 @@ from deviceaction import *
from formats import getFormat
from formats import get_device_format_class
from formats import get_default_filesystem_type
-from devicelibs.lvm import safeLvmName
from devicelibs.dm import name_from_dm_node
from devicelibs.crypto import generateBackupPassphrase
from devicelibs.mpath import MultipathConfigWriter
@@ -697,6 +696,10 @@ class Storage(object):
_platform = getattr(self.anaconda, "platform", None)
return _platform

+ @property
+ def names(self):
+ return self.devicetree.names
+
def exceptionDisks(self):
""" Return a list of removable devices to save exceptions to.

@@ -862,9 +865,9 @@ class Storage(object):
hostname = ""
if hasattr(self.anaconda, "network"):
hostname = self.anaconda.network.hostname
- name = self.createSuggestedVGName(hostname=hostname)
+ name = self.suggestContainerName(hostname=hostname, prefix="vg")

- if name in [d.name for d in self.devices]:
+ if name in self.names:
raise ValueError("name already in use")

return LVMVolumeGroupDevice(name, pvs, *args, **kwargs)
@@ -886,11 +889,12 @@ class Storage(object):
swap = True
else:
swap = False
- name = self.createSuggestedLVName(vg,
- swap=swap,
- mountpoint=mountpoint)
+ name = self.suggestDeviceName(prefix="lv",
+ parent=vg,
+ swap=swap,
+ mountpoint=mountpoint)

- if name in [d.name for d in self.devices]:
+ if name in self.names:
raise ValueError("name already in use")

return LVMLogicalVolumeDevice(name, vg, *args, **kwargs)
@@ -964,71 +968,90 @@ class Storage(object):
return True
return False

- def createSuggestedVGName(self, hostname=None):
- """ Return a reasonable, unused VG name. """
- # try to create a volume group name incorporating the hostname
+ def safeDeviceName(self, name):
+ """ Convert a device name to something safe and return that.
+
+ LVM limits lv names to 128 characters. I don't know the limits for
+ the other various device types, so I'm going to pick a number so
+ that we don't have to have an entire fucking library to determine
+ device name limits.
+ """
+ max_len = 96 # No, you don't need longer names than this. Really.
+ tmp = name.strip()
+ tmp = tmp.replace("/", "_")
+ tmp = re.sub("[^0-9a-zA-Z._-]", "", tmp)
+ tmp = tmp.lstrip("_")
+
+ if len(tmp) > max_len:
+ tmp = tmp[:max_len]
+
+ return tmp
+
+ def suggestContainerName(self, hostname=None, prefix=""):
+ """ Return a reasonable, unused device name. """
+ # try to create a device name incorporating the hostname
if hostname not in (None, "", 'localhost', 'localhost.localdomain'):
- template = "vg_%s" % (hostname.split('.')[0].lower(),)
- vgtemplate = safeLvmName(template)
+ template = "%s_%s" % (prefix, hostname.split('.')[0].lower())
+ template = self.safeDeviceName(template)
elif flags.imageInstall:
- vgtemplate = "vg_image"
+ template = "%s_image" % prefix
else:
- vgtemplate = "VolGroup"
-
- vgnames = [vg.name for vg in self.vgs]
- if vgtemplate not in vgnames and
- vgtemplate not in lvm.lvm_vg_blacklist:
- return vgtemplate
- else:
- i = 0
- while 1:
- tmpname = "%s%02d" % (vgtemplate, i,)
- if not tmpname in vgnames and
- tmpname not in lvm.lvm_vg_blacklist:
+ template = prefix
+
+ names = self.names
+ name = template
+ if name in names:
+ name = None
+ for i in range(100):
+ tmpname = "%s%02d" % (template, i,)
+ if tmpname not in names:
+ name = tmpname
break

- i += 1
- if i > 99:
- tmpname = ""
+ if not name:
+ log.error("failed to create device name based on prefix "
+ "'%s' and hostname '%s'" % (prefix, hostname))
+ raise RuntimeError("unable to find suitable device name")

- return tmpname
+ return name

- def createSuggestedLVName(self, vg, swap=None, mountpoint=None):
+ def suggestDeviceName(self, parent=None, swap=None,
+ mountpoint=None, prefix=""):
""" Return a suitable, unused name for a new logical volume. """
- # FIXME: this is not at all guaranteed to work
+ body = ""
if mountpoint:
- # try to incorporate the mountpoint into the name
- if mountpoint == '/':
- lvtemplate = 'lv_root'
+ if mountpoint == "/":
+ body = "_root"
else:
- if mountpoint.startswith("/"):
- template = "lv_%s" % mountpoint[1:]
+ body = mountpoint.replace("/", "_")
+ elif swap:
+ body = "_swap"
+
+ template = self.safeDeviceName(prefix + body)
+ names = self.names
+ name = template
+ def full_name(name, parent):
+ full = ""
+ if parent:
+ full = "%s-" % parent.name
+ full += name
+ return full
+
+ if full_name(name, parent) in names:
+ for i in range(100):
+ name = "%s%02d" % (template, i)
+ if name not in names:
+ break
else:
- template = "lv_%s" % (mountpoint,)
+ name = ""

- lvtemplate = safeLvmName(template)
- else:
- if swap:
- if len([s for s in self.swaps if s in vg.lvs]):
- idx = len([s for s in self.swaps if s in vg.lvs])
- while True:
- lvtemplate = "lv_swap%02d" % idx
- if lvtemplate in [lv.lvname for lv in vg.lvs]:
- idx += 1
- else:
- break
- else:
- lvtemplate = "lv_swap"
- else:
- idx = len(vg.lvs)
- while True:
- lvtemplate = "LogVol%02d" % idx
- if lvtemplate in [l.lvname for l in vg.lvs]:
- idx += 1
- else:
- break
+ if not name:
+ log.error("failed to create device name based on parent '%s', "
+ "prefix '%s', mountpoint '%s', swap '%s'"
+ % (parent.name, prefix, mountpoint, swap))
+ raise RuntimeError("unable to find suitable device name")

- return lvtemplate
+ return name

def doEncryptionPassphraseRetrofits(self):
""" Add the global passphrase to all preexisting LUKS devices.
diff --git a/pyanaconda/storage/devicelibs/lvm.py b/pyanaconda/storage/devicelibs/lvm.py
index 121c896..feb1216 100644
--- a/pyanaconda/storage/devicelibs/lvm.py
+++ b/pyanaconda/storage/devicelibs/lvm.py
@@ -122,21 +122,6 @@ def getMaxLVSize():
else:
return (16*1024*1024) #Max is 16TiB

-# LVM sources set the maximum length limit on VG and LV names at 128. Set
-# our default to 2 below that to account for 0 through 99 entries we may
-# make with this name as a prefix. LVM doesn't seem to impose a limit of
-# 99, but we do in anaconda.
-def safeLvmName(name, maxlen=126):
- tmp = name.strip()
- tmp = tmp.replace("/", "_")
- tmp = re.sub("[^0-9a-zA-Z._]", "", tmp)
- tmp = tmp.lstrip("_")
-
- if len(tmp) > maxlen:
- tmp = tmp[:maxlen]
-
- return tmp
-
def clampSize(size, pesize, roundup=None):
if roundup:
round = math.ceil
diff --git a/pyanaconda/storage/devicetree.py b/pyanaconda/storage/devicetree.py
index 7b411e6..6914c6e 100644
--- a/pyanaconda/storage/devicetree.py
+++ b/pyanaconda/storage/devicetree.py
@@ -1,7 +1,7 @@
# devicetree.py
# Device management for anaconda's storage configuration module.
#
-# Copyright (C) 2009 Red Hat, Inc.
+# Copyright (C) 2009, 2010, 2011 Red Hat, Inc.
#
# This copyrighted material is made available to anyone wishing to use,
# modify, copy, or redistribute it subject to the terms and conditions of
@@ -158,6 +158,9 @@ class DeviceTree(object):
self._devices = []
self._actions = []

+ # a list of all device names we encounter
+ self.names = []
+
# indicates whether or not the tree has been fully populated
self.populated = False

@@ -343,6 +346,12 @@ class DeviceTree(object):
raise DeviceTreeError("parent device not in tree")

self._devices.append(newdev)
+
+ # don't include "req%d" partition names
+ if ((newdev.type != "partition" or
+ not newdev.name.startswith("req")) and
+ newdev.name not in self.names):
+ self.names.append(newdev.name)
log.info("added %s %s (id %d) to device tree" % (newdev.type,
newdev.name,
newdev.id))
@@ -380,6 +389,8 @@ class DeviceTree(object):
device.updateName()

self._devices.remove(dev)
+ if dev.name in self.names:
+ self.names.remove(dev.name)
log.info("removed %s %s (id %d) from device tree" % (dev.type,
dev.name,
dev.id))
@@ -940,6 +951,10 @@ class DeviceTree(object):
uuid = udev_device_get_uuid(info)
sysfs_path = udev_device_get_sysfs_path(info)

+ # make sure we note the name of every device we see
+ if name not in self.names:
+ self.names.append(name)
+
if self.isIgnored(info):
log.info("ignoring %s (%s)" % (name, sysfs_path))
if name not in self._ignoredDisks:
@@ -1376,6 +1391,10 @@ class DeviceTree(object):
vg_device.lv_sizes.append(lv_sizes[i])
vg_device.lv_attr.append(lv_attr[i])

+ name = "%s-%s" % (vg_name, lv_names[i])
+ if name not in self.names:
+ self.names.append(name)
+
def handleUdevMDMemberFormat(self, info, device):
log_method_call(self, name=device.name, type=device.format.type)
# either look up or create the array device
--
1.7.3.4

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