def attach(env):
"""Map an existing vlmc Image to a block device
This function maps an existing vlmc Image to a block device
e.g. /dev/xsegbd{X} and returns the device path. If the mapping
already exists, it returns the corresponding device path.
"""
name = env.get("name")
# Check if the mapping already exists
d_id = vlmc.is_mapped(name)
if d_id is not None:
sys.stderr.write("The mapping exists for %s\n" % name)
# The mapping exists. Return it.
sys.stdout.write("%s" % str(DEVICE_PREFIX + str(d_id)))
return 0
# The mapping doesn't exist. Create it.
d_id = vlmc.map_volume(name=name)
# The device was successfully mapped. Return it.
#maybe assert (d_id == vlmc.is_mapped(name)
sys.stdout.write("%s" % str(DEVICE_PREFIX + str(d_id)))
sys.stderr.write("Create the mapping for %s\n" % name)
return 0
def mkfs_and_mount(volume, mountdir):
d_id = vlmc.map_volume(name=volume)
device = DEVICE_PREFIX + str(d_id)
cmd = ['mkfs.ext3', device]
check_call(cmd, shell=False)
try:
mount(device, mountdir)
umount(device)
finally:
vlmc.unmap_volume(name=device)
def mkfs_and_mount(volume, mountdir):
d_id=vlmc.map_volume(name=volume)
device = DEVICE_PREFIX + str(d_id)
cmd = ['mkfs.ext3', device]
check_call(cmd, shell=False)
try:
mount(device, mountdir)
umount(device)
finally:
vlmc.unmap_volume(name=device)
def write(volume, volumesize):
d_id = vlmc.map_volume(name=volume)
device = DEVICE_PREFIX + str(d_id)
try:
fd = os.open(device, os.O_WRONLY)
os.lseek(fd, (volumesize * 1024 * 1024) + 1, os.SEEK_SET)
os.write(fd, "This should not succeed")
print("wtf")
except OSError, (err, reason):
if err != errno.EINVAL:
raise Error("Cannot write to device %s : %s" % (device, reason))
def write(volume, volumesize):
d_id=vlmc.map_volume(name=volume)
device = DEVICE_PREFIX + str(d_id)
try:
fd = os.open(device, os.O_WRONLY)
os.lseek(fd, (volumesize*1024*1024)+1, os.SEEK_SET)
os.write(fd, "This should not succeed")
print ("wtf")
except OSError, (err, reason):
if err != errno.EINVAL:
raise Error("Cannot write to device %s : %s" % (device,reason))
def write_data(volume, mountdir, randomfiles):
d_id = vlmc.map_volume(name=volume)
device = DEVICE_PREFIX + str(d_id)
try:
mount(device, mountdir)
for rf in randomfiles:
print "writing " + rf[0]
f = open(os.path.join(mountdir, rf[0]), 'w')
f.write(rf[1])
f.close()
finally:
umount(device)
vlmc.unmap_volume(name=device)
def write_data(volume, mountdir, randomfiles):
d_id=vlmc.map_volume(name=volume)
device = DEVICE_PREFIX + str(d_id)
try:
mount(device, mountdir)
for rf in randomfiles:
print "writing " + rf[0]
f = open(os.path.join(mountdir, rf[0]), 'w')
f.write(rf[1])
f.close()
finally:
umount(device)
vlmc.unmap_volume(name=device)
def read_data(volume, mountdir, randomfiles):
d_id = vlmc.map_volume(name=volume)
device = DEVICE_PREFIX + str(d_id)
try:
mount(device, mountdir)
for rf in randomfiles:
print "reading " + rf[0]
f = open(os.path.join(mountdir, rf[0]), 'r')
data = f.read()
f.close()
if data != rf[1]:
raise Error("Data mismatch %s" % rf[0])
finally:
umount(device)
vlmc.unmap_volume(name=device)
def read_data(volume, mountdir, randomfiles):
d_id=vlmc.map_volume(name=volume)
device = DEVICE_PREFIX + str(d_id)
try:
mount(device, mountdir)
for rf in randomfiles:
print "reading " + rf[0]
f = open(os.path.join(mountdir, rf[0]), 'r')
data = f.read()
f.close()
if data != rf[1]:
raise Error("Data mismatch %s" % rf[0])
finally:
umount(device)
vlmc.unmap_volume(name=device)
