本文整理汇总了Python中util.pathexists函数的典型用法代码示例。如果您正苦于以下问题：Python pathexists函数的具体用法？Python pathexists怎么用？Python pathexists使用的例子？那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。
在下文中一共展示了pathexists函数的15个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: _find_path_with_retries
def _find_path_with_retries(self, vdi_uuid, maxretry=5, period=2.0):
vhd_path = os.path.join(self.sr.path, "%s.%s" % \
(vdi_uuid, self.PARAM_VHD))
raw_path = os.path.join(self.sr.path, "%s.%s" % \
(vdi_uuid, self.PARAM_RAW))
cbt_path = os.path.join(self.sr.path, "%s.%s" %
(vdi_uuid, CBTLOG_TAG))
found = False
tries = 0
while tries < maxretry and not found:
tries += 1
if util.ioretry(lambda: util.pathexists(vhd_path)):
self.vdi_type = vhdutil.VDI_TYPE_VHD
self.path = vhd_path
found = True
elif util.ioretry(lambda: util.pathexists(raw_path)):
self.vdi_type = vhdutil.VDI_TYPE_RAW
self.path = raw_path
self.hidden = False
found = True
elif util.ioretry(lambda: util.pathexists(cbt_path)):
self.vdi_type = CBTLOG_TAG
self.path = cbt_path
self.hidden = False
found = True
if not found:
util.SMlog("VHD %s not found, retry %s of %s" % (vhd_path, tries, maxretry))
time.sleep(period)
return found示例2: _checkActive
def _checkActive(path):
if util.pathexists(path):
return True
util.SMlog("_checkActive: %s does not exist!" % path)
symlinkExists = os.path.lexists(path)
util.SMlog("_checkActive: symlink exists: %s" % symlinkExists)
mapperDeviceExists = False
mapperDevice = path[5:].replace("-", "--").replace("/", "-")
cmd = [CMD_DMSETUP, "status", mapperDevice]
try:
ret = util.pread2(cmd)
mapperDeviceExists = True
util.SMlog("_checkActive: %s: %s" % (mapperDevice, ret))
except util.CommandException:
util.SMlog("_checkActive: device %s does not exist" % mapperDevice)
mapperPath = "/dev/mapper/" + mapperDevice
mapperPathExists = util.pathexists(mapperPath)
util.SMlog("_checkActive: path %s exists: %s" % \
(mapperPath, mapperPathExists))
if mapperDeviceExists and mapperPathExists and not symlinkExists:
# we can fix this situation manually here
try:
util.SMlog("_checkActive: attempt to create the symlink manually.")
os.symlink(mapperPath, path)
except OSError, e:
util.SMlog("ERROR: failed to symlink!")
if e.errno != errno.EEXIST:
raise
if util.pathexists(path):
util.SMlog("_checkActive: created the symlink manually")
return True示例3: _checkmount
def _checkmount(self):
mount_path = self.path
if self.handles("cifs"):
mount_path = self.mountpoint
return util.ioretry(lambda: util.pathexists(mount_path) and \
(util.ismount(mount_path) or \
util.pathexists(self.remotepath) and self._isbind()))示例4: __init__
def __init__(self, ns):
self.ns = ns
self.nsDir = os.path.join(self.BASE_DIR, self.ns)
if not util.pathexists(self.nsDir):
try:
os.makedirs(self.nsDir)
except OSError:
pass
if not util.pathexists(self.nsDir):
raise IPCFlagException("failed to create %s" % self.nsDir)示例5: createJournalDir
def createJournalDir():
if util.pathexists(VHD_JOURNAL_LOCATION):
return
try:
os.makedirs(VHD_JOURNAL_LOCATION)
except OSError:
pass
if not util.pathexists(VHD_JOURNAL_LOCATION):
raise util.SMException("Failed to create dirs %s" % \
VHD_JOURNAL_LOCATION)示例6: _reset
def _reset(ns, obj = None):
nsDir = os.path.join(RefCounter.BASE_DIR, ns)
if not util.pathexists(nsDir):
return
if obj:
if not util.pathexists(os.path.join(nsDir, obj)):
return
objList = [obj]
else:
try:
objList = os.listdir(nsDir)
except OSError:
raise RefCounterException("failed to list '%s'" % ns)
for obj in objList:
RefCounter._removeObject(ns, obj)示例7: _get
def _get(ns, obj):
"""Get the ref count values for 'obj' in namespace 'ns'"""
objFile = os.path.join(RefCounter.BASE_DIR, ns, obj)
(count, binaryCount) = (0, 0)
if util.pathexists(objFile):
(count, binaryCount) = RefCounter._readCount(objFile)
return (count, binaryCount)示例8: delete
def delete(self, sr_uuid):
if not self._checkpath(self.path):
raise xs_errors.XenError("SRUnavailable", opterr="no such directory %s" % self.path)
cleanup.gc_force(self.session, self.uuid)
# check to make sure no VDIs are present; then remove old
# files that are non VDI's
try:
if util.ioretry(lambda: util.pathexists(self.path)):
# Load the VDI list
self._loadvdis()
for uuid in self.vdis:
if not self.vdis[uuid].deleted:
raise xs_errors.XenError("SRNotEmpty", opterr="VDIs still exist in SR")
# remove everything else, there are no vdi's
for name in util.ioretry(lambda: util.listdir(self.path)):
fullpath = os.path.join(self.path, name)
try:
util.ioretry(lambda: os.unlink(fullpath))
except util.CommandException, inst:
if inst.code != errno.ENOENT and inst.code != errno.EISDIR:
raise xs_errors.XenError(
"FileSRDelete", opterr="failed to remove %s error %d" % (fullpath, inst.code)
)
except util.CommandException, inst:
raise xs_errors.XenError("FileSRDelete", opterr="error %d" % inst.code)示例9: load
def load(self, vdi_uuid):
self.vdi_type = SR.DEFAULT_TAP
self.path = os.path.join(self.sr.path, "%s.%s" % \
(vdi_uuid,self.vdi_type))
if util.ioretry(lambda: util.pathexists(self.path)):
try:
st = util.ioretry(lambda: os.stat(self.path))
self.utilisation = long(st.st_size)
except util.CommandException, inst:
if inst.code == errno.EIO:
raise xs_errors.XenError('VDILoad', \
opterr='Failed load VDI information %s' % self.path)
else:
raise xs_errors.XenError('VDIType', \
opterr='Invalid VDI type %s' % self.vdi_type)
try:
diskinfo = util.ioretry(lambda: self._query_info(self.path))
if diskinfo.has_key('parent'):
self.parent = diskinfo['parent']
else:
self.parent = ''
self.size = long(diskinfo['size']) * 1024 * 1024
self.hidden = long(diskinfo['hidden'])
except util.CommandException, inst:
raise xs_errors.XenError('VDILoad', \
opterr='Failed load VDI information %s' % self.path)示例10: create
def create(self, sr_uuid, vdi_uuid, size):
if util.ioretry(lambda: util.pathexists(self.path)):
raise xs_errors.XenError('VDIExists')
overhead = 0
if self.vdi_type == vhdutil.VDI_TYPE_VHD:
overhead = vhdutil.calcOverheadFull(long(size))
# Test the amount of actual disk space
if ENFORCE_VIRT_ALLOC:
self.sr._loadvdis()
reserved = self.sr.virtual_allocation
sr_size = self.sr._getsize()
if (sr_size - reserved) < (long(size) + overhead):
raise xs_errors.XenError('SRNoSpace')
if self.vdi_type == vhdutil.VDI_TYPE_VHD:
try:
mb = 1024L * 1024L
size_mb = util.roundup(VHD_SIZE_INC, long(size)) / mb
if size_mb < 1 or (size_mb + (overhead / mb)) >= MAX_DISK_MB:
raise xs_errors.XenError('VDISize', opterr='VDI size ' + \
'must be between 1 MB and %d MB' % \
((MAX_DISK_MB - MAX_DISK_METADATA) - 1))
util.ioretry(lambda: self._create(str(size_mb), self.path))
self.size = util.ioretry(lambda: self._query_v(self.path))
except util.CommandException, inst:
raise xs_errors.XenError('VDICreate',
opterr='error %d' % inst.code)示例11: _createNamespace
def _createNamespace(ns):
nsDir = os.path.join(RefCounter.BASE_DIR, ns)
if not util.pathexists(nsDir):
try:
os.makedirs(nsDir)
except OSError:
raise RefCounterException("failed to makedirs '%s'" % nsDir)示例12: _checkpath
def _checkpath(self, path):
try:
if not util.ioretry(lambda: util.pathexists(path)):
return False
return True
except util.CommandException, inst:
raise xs_errors.XenError("EIO", opterr="IO error checking path %s" % path)示例13: delete
def delete(self, sr_uuid):
self.attach(sr_uuid)
cleanup.gc_force(self.session, self.uuid)
# check to make sure no VDIs are present; then remove old
# files that are non VDI's
try:
if util.ioretry(lambda: util.pathexists(self.path)):
#Load the VDI list
self._loadvdis()
for uuid in self.vdis:
if not self.vdis[uuid].deleted:
raise xs_errors.XenError('SRNotEmpty', \
opterr='VDIs still exist in SR')
# remove everything else, there are no vdi's
for name in util.ioretry(lambda: util.listdir(self.path)):
fullpath = os.path.join(self.path,name)
try:
util.ioretry(lambda: os.unlink(fullpath))
except util.CommandException, inst:
if inst.code != errno.ENOENT and \
inst.code != errno.EISDIR:
raise xs_errors.XenError('FileSRDelete', \
opterr='failed to remove %s error %d' \
% (fullpath, inst.code))
self.detach(sr_uuid)示例14: create
def create(self, sr_uuid, vdi_uuid, size):
if util.ioretry(lambda: util.pathexists(self.path)):
raise xs_errors.XenError('VDIExists')
overhead = 0
if self.vdi_type == vhdutil.VDI_TYPE_VHD:
overhead = vhdutil.calcOverheadFull(long(size))
# Test the amount of actual disk space
if ENFORCE_VIRT_ALLOC:
self.sr._loadvdis()
reserved = self.sr.virtual_allocation
sr_size = self.sr._getsize()
if (sr_size - reserved) < (long(size) + overhead):
raise xs_errors.XenError('SRNoSpace')
if self.vdi_type == vhdutil.VDI_TYPE_VHD:
try:
size = vhdutil.validate_and_round_vhd_size(long(size))
mb = 1024L * 1024L
size_mb = long(size) / mb
util.ioretry(lambda: self._create(str(size_mb), self.path))
self.size = util.ioretry(lambda: self._query_v(self.path))
except util.CommandException, inst:
raise xs_errors.XenError('VDICreate',
opterr='error %d' % inst.code)示例15: create
def create(self, sr_uuid, size):
if util.ioretry(lambda: self._checkmount()):
raise xs_errors.XenError('NFSAttached')
# Set the target path temporarily to the base dir
# so that we can create the target SR directory
self.remotepath = self.dconf['serverpath']
try:
self.attach(sr_uuid)
except:
try:
os.rmdir(self.path)
except:
pass
raise xs_errors.XenError('NFSMount')
newpath = os.path.join(self.path, sr_uuid)
if util.ioretry(lambda: util.pathexists(newpath)):
if len(util.ioretry(lambda: util.listdir(newpath))) != 0:
self.detach(sr_uuid)
raise xs_errors.XenError('SRExists')
else:
try:
util.ioretry(lambda: util.makedirs(newpath))
except util.CommandException, inst:
if inst.code != errno.EEXIST:
self.detach(sr_uuid)
raise xs_errors.XenError('NFSCreate', \
opterr='remote directory creation error is %d' \
% inst.code)