# interpreted as representing official policies, either expressed
# or implied, of GRNET S.A.
-from image_creator.util import get_command, warn, progress_generator
-from image_creator import FatalError
-from clint.textui import indent, puts, colored
+from image_creator.util import get_command
+from image_creator.util import warn, progress, success, output, FatalError
import stat
import os
import sys
import guestfs
import time
+from sendfile import sendfile
class DiskError(Exception):
the Disk instance.
"""
- puts("Examining source media `%s'" % self.source)
- with indent(4):
- sourcedev = self.source
- mode = os.stat(self.source).st_mode
- if stat.S_ISDIR(mode):
- puts(colored.green('Looks like a directory'))
- return self._losetup(self._dir_to_disk())
- elif stat.S_ISREG(mode):
- puts(colored.green('Looks like an image file'))
- sourcedev = self._losetup(self.source)
- elif not stat.S_ISBLK(mode):
- raise ValueError("Invalid media source. Only block devices, "
- "regular files and directories are supported.")
- else:
- puts(colored.green('Looks like a block device'))
- #puts()
+ output("Examining source media `%s'..." % self.source, False)
+ sourcedev = self.source
+ mode = os.stat(self.source).st_mode
+ if stat.S_ISDIR(mode):
+ success('looks like a directory')
+ return self._losetup(self._dir_to_disk())
+ elif stat.S_ISREG(mode):
+ success('looks like an image file')
+ sourcedev = self._losetup(self.source)
+ elif not stat.S_ISBLK(mode):
+ raise ValueError("Invalid media source. Only block devices, "
+ "regular files and directories are supported.")
+ else:
+ success('looks like a block device')
# Take a snapshot and return it to the user
- puts("Snapshotting media source")
- with indent(4):
- size = blockdev('--getsize', sourcedev)
- cowfd, cow = tempfile.mkstemp()
- os.close(cowfd)
- self._add_cleanup(os.unlink, cow)
- # Create 1G cow sparse file
- dd('if=/dev/null', 'of=%s' % cow, 'bs=1k', \
- 'seek=%d' % (1024 * 1024))
- cowdev = self._losetup(cow)
-
- snapshot = uuid.uuid4().hex
- tablefd, table = tempfile.mkstemp()
- try:
- os.write(tablefd, "0 %d snapshot %s %s n 8" % \
- (int(size), sourcedev, cowdev))
- dmsetup('create', snapshot, table)
- self._add_cleanup(dmsetup, 'remove', snapshot)
- # Sometimes dmsetup remove fails with Device or resource busy,
- # although everything is cleaned up and the snapshot is not
- # used by anyone. Add a 2 seconds delay to be on the safe side.
- self._add_cleanup(time.sleep, 2)
-
- finally:
- os.unlink(table)
- puts(colored.green('Done'))
- # puts()
+ output("Snapshotting media source...", False)
+ size = blockdev('--getsize', sourcedev)
+ cowfd, cow = tempfile.mkstemp()
+ os.close(cowfd)
+ self._add_cleanup(os.unlink, cow)
+ # Create 1G cow sparse file
+ dd('if=/dev/null', 'of=%s' % cow, 'bs=1k', \
+ 'seek=%d' % (1024 * 1024))
+ cowdev = self._losetup(cow)
+
+ snapshot = uuid.uuid4().hex
+ tablefd, table = tempfile.mkstemp()
+ try:
+ os.write(tablefd, "0 %d snapshot %s %s n 8" % \
+ (int(size), sourcedev, cowdev))
+ dmsetup('create', snapshot, table)
+ self._add_cleanup(dmsetup, 'remove', snapshot)
+ # Sometimes dmsetup remove fails with Device or resource busy,
+ # although everything is cleaned up and the snapshot is not
+ # used by anyone. Add a 2 seconds delay to be on the safe side.
+ self._add_cleanup(time.sleep, 2)
+
+ finally:
+ os.unlink(table)
+ success('done')
new_device = DiskDevice("/dev/mapper/%s" % snapshot)
self._devices.append(new_device)
new_device.enable()
def enable(self):
"""Enable a newly created DiskDevice"""
- self.progressbar = progress_generator("Launching helper VM: ")
- with indent(4):
- self.progressbar.next()
- eh = self.g.set_event_callback(self.progress_callback,
- guestfs.EVENT_PROGRESS)
- self.g.launch()
- self.guestfs_enabled = True
- self.g.delete_event_callback(eh)
- if self.progressbar is not None:
- self.progressbar.send(100)
- self.progressbar = None
- puts(colored.green('Done'))
-
- puts('Inspecting Operating System')
- with indent(4):
- roots = self.g.inspect_os()
- if len(roots) == 0:
- raise FatalError("No operating system found")
- if len(roots) > 1:
- raise FatalError("Multiple operating systems found."
- "We only support images with one filesystem.")
- self.root = roots[0]
- self.ostype = self.g.inspect_get_type(self.root)
- self.distro = self.g.inspect_get_distro(self.root)
- puts(colored.green('Found a %s system' % self.distro))
- puts()
+ self.progressbar = progress("Launching helper VM: ")
+ self.progressbar.next()
+ eh = self.g.set_event_callback(self.progress_callback,
+ guestfs.EVENT_PROGRESS)
+ self.g.launch()
+ self.guestfs_enabled = True
+ self.g.delete_event_callback(eh)
+ if self.progressbar is not None:
+ self.progressbar.send(100)
+ self.progressbar = None
+
+ output('Inspecting Operating System...', False)
+ roots = self.g.inspect_os()
+ if len(roots) == 0:
+ raise FatalError("No operating system found")
+ if len(roots) > 1:
+ raise FatalError("Multiple operating systems found."
+ "We only support images with one filesystem.")
+ self.root = roots[0]
+ self.ostype = self.g.inspect_get_type(self.root)
+ self.distro = self.g.inspect_get_distro(self.root)
+ success('found a %s system' % self.distro)
def destroy(self):
"""Destroy this DiskDevice instance."""
def mount(self):
"""Mount all disk partitions in a correct order."""
+
+ output("Mounting image...", False)
mps = self.g.inspect_get_mountpoints(self.root)
# Sort the keys to mount the fs in a correct order.
try:
self.g.mount(dev, mp)
except RuntimeError as msg:
- print "%s (ignored)" % msg
+ warn("%s (ignored)" % msg)
+ success("done")
def umount(self):
"""Umount all mounted filesystems."""
disk and then updating the partition table. The new disk size
(in bytes) is returned.
"""
- puts("Shrinking image (this may take a while)")
-
+ output("Shrinking image (this may take a while)...", False)
+
dev = self.g.part_to_dev(self.root)
parttype = self.g.part_get_parttype(dev)
if parttype != 'msdos':
warn("Don't know how to resize %s partitions." % vfs_type)
return
- with indent(4):
- self.g.e2fsck_f(part_dev)
- self.g.resize2fs_M(part_dev)
+ self.g.e2fsck_f(part_dev)
+ self.g.resize2fs_M(part_dev)
- output = self.g.tune2fs_l(part_dev)
- block_size = int(
- filter(lambda x: x[0] == 'Block size', output)[0][1])
- block_cnt = int(
- filter(lambda x: x[0] == 'Block count', output)[0][1])
+ out = self.g.tune2fs_l(part_dev)
+ block_size = int(
+ filter(lambda x: x[0] == 'Block size', out)[0][1])
+ block_cnt = int(
+ filter(lambda x: x[0] == 'Block count', out)[0][1])
- sector_size = self.g.blockdev_getss(dev)
+ sector_size = self.g.blockdev_getss(dev)
- start = last_partition['part_start'] / sector_size
- end = start + (block_size * block_cnt) / sector_size - 1
+ start = last_partition['part_start'] / sector_size
+ end = start + (block_size * block_cnt) / sector_size - 1
- self.g.part_del(dev, last_partition['part_num'])
- self.g.part_add(dev, 'p', start, end)
+ self.g.part_del(dev, last_partition['part_num'])
+ self.g.part_add(dev, 'p', start, end)
- new_size = (end + 1) * sector_size
- puts(" New image size is %dMB\n" % (new_size // 2 ** 20))
+ new_size = (end + 1) * sector_size
+ success("new image size is %dMB" %
+ ((new_size + 2 ** 20 - 1) // 2 ** 20))
return new_size
def size(self):
dev = self.g.part_to_dev(self.root)
last = self.g.part_list(dev)[-1]
- return last['part_end']
+ return last['part_end'] + 1
+
+ def dump(self, outfile):
+ """Dumps the content of device into a file.
+
+ This method will only dump the actual payload, found by reading the
+ partition table. Empty space in the end of the device will be ignored.
+ """
+ blocksize = 2 ** 22 # 4MB
+ size = self.size()
+ progress_size = (size + 2 ** 20 - 1) // 2 ** 20 # in MB
+ progressbar = progress("Dumping image file: ", progress_size)
+
+ source = open(self.device, "r")
+ try:
+ dest = open(outfile, "w")
+ try:
+ left = size
+ offset = 0
+ progressbar.next()
+ while left > 0:
+ length = min(left, blocksize)
+ sent = sendfile(dest.fileno(), source.fileno(), offset,
+ length)
+ offset += sent
+ left -= sent
+ for i in range((length + 2 ** 20 - 1) // 2 ** 20):
+ progressbar.next()
+ finally:
+ dest.close()
+ finally:
+ source.close()
+
+ success('Image file %s was successfully created' % outfile)
# vim: set sta sts=4 shiftwidth=4 sw=4 et ai :
projects / snf-image-creator / blobdiff