def list(path=None):
"""Return a list of all the tapdisks on a system (if path == None) or
only those which have opened a file in a particular directory tree
(if path == "/some/tree")."""
cmd = [TAP_CTL, "list"]
output = util.ioretry(lambda: util.pread2(cmd), errlist=[errno.EPROTO, errno.ENOENT])
results = []
for line in output.split("\n"):
# FIXME: tap-ctl writes error messages to stdout and
# confuses this parser
if line == "blktap kernel module not installed\n":
# This isn't pretty but (a) neither is confusing stdout/stderr
# and at least causes the error to describe the fix
raise Exception, "blktap kernel module not installed: try 'modprobe blktap'"
minor = None
pid = None
file = None
# pid=16775 minor=0 state=0 args=vhd:/foo/data/108.vhd
# line = [minor=1]
for field in line.rstrip().split(" "):
bits = field.split("=")
if len(bits) == 2:
key, val = field.split("=")
if key == "pid":
pid = int(val, 10)
elif key == "minor":
minor = int(val, 10)
elif key == "args":
x = val.split(":", 2)
file = (x[0], x[1])
else:
log("Ignoring unexpected tap-ctl output: %s" % repr(field))
if minor or pid:
if not path or (file and file[1].startswith(path)):
c = Tapdisk(minor=minor, pid=pid, file=file)
results.append(c)
return results
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
import os
import util, errno, os.path
from xcp import log, MissingDependency
MOUNT_NFS = "/sbin/mount.nfs"
UMOUNT = "/bin/umount"
MTAB = "/etc/mtab"
MKDIR = "/bin/mkdir"
if not(os.path.exists(MOUNT_NFS)):
log("%s does not exist: do you need to install nfs-utils?" % MOUNT_NFS)
raise MissingDependency(MOUNT_NFS)
if not(os.path.exists(UMOUNT)):
log("%s does not exist: do you need to install util-linux?" % UMOUNT)
raise MissingDependency(UMOUNT)
if not(os.path.exists(MTAB)):
log("%s does not exist: this environment is too strange?" % MTAB)
raise MissingDependency(MTAB)
if not(os.path.exists(MKDIR)):
log("%s does not exist: do you need to install coreutils?" % MKDIR)
raise MissingDependency(MKDIR)
class Mount:
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
import util, errno, os.path
from xcp import log, MissingDependency
TAP_CTL = "/usr/sbin/tap-ctl"
if not (os.path.exists(TAP_CTL)):
log("%s does not exist: do you need to install tapdisk/blktap?" % TAP_CTL)
raise MissingDependency(TAP_CTL)
class Tapdisk:
def __init__(self, minor=None, pid=None, file=None):
if minor == None:
minor = self._allocate()
if pid == None:
pid = self._spawn()
self._attach(minor, pid)
self.minor = minor
self.pid = pid
self.file = file
self.mirror = None
