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Add submount directory to PartitionMount class

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This allows the partition to be mounted on a directory underneath the
temporary directory, eg. /rootfs/, to help support creating other image
types without needed to move the files around.
This commit is contained in:
Brian C. Lane 2015-10-19 15:33:30 -07:00
parent 0b8b74edda
commit b96fd98af3
1 changed files with 30 additions and 9 deletions
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35
src/pylorax/imgutils.py
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@ -27,6 +27,7 @@ import sys
import traceback
import multiprocessing
from time import sleep
import shutil
from pylorax.sysutils import cpfile
from pylorax.executils import execWithRedirect, execWithCapture
@ -305,17 +306,30 @@ class Mount(object):
class PartitionMount(object):
""" Mount a partitioned image file using kpartx """
def __init__(self, disk_img, mount_ok=None):
def __init__(self, disk_img, mount_ok=None, submount=None):
"""
disk_img is the full path to a partitioned disk image
mount_ok is a function that is passed the mount point and
:param str disk_img: The full path to a partitioned disk image
:param mount_ok: A function that is passed the mount point and
returns True if it should be mounted.
:param str submount: Directory inside mount_dir to mount at
If mount_ok is not set it will look for /etc/passwd
If the partition is found it will be mounted under a temporary
directory and self.temp_dir set to it. If submount is passed it will be
created and mounted there instead, with self.mount_dir set to point to
it. self.mount_dev is set to the loop device, and self.mount_size is
set to the size of the partition.
When no subdir is passed self.temp_dir and self.mount_dir will be the same.
"""
self.mount_dev = None
self.mount_size = None
self.mount_dir = None
self.disk_img = disk_img
self.mount_ok = mount_ok
self.submount = submount
self.temp_dir = None
# Default is to mount partition with /etc/passwd
if not self.mount_ok:
@ -339,7 +353,12 @@ class PartitionMount(object):
def __enter__(self):
# Mount the device selected by mount_ok, if possible
mount_dir = tempfile.mkdtemp()
self.temp_dir = tempfile.mkdtemp()
if self.submount:
mount_dir = os.path.normpath(os.path.sep.join([self.temp_dir, self.submount]))
os.makedirs(mount_dir, mode=0o755, exist_ok=True)
else:
mount_dir = self.temp_dir
for dev, size in self.loop_devices:
try:
mount( "/dev/mapper/"+dev, mnt=mount_dir )
@ -355,14 +374,16 @@ class PartitionMount(object):
logger.info("Partition mounted on %s size=%s", self.mount_dir, self.mount_size)
else:
logger.debug("Unable to mount anything from %s", self.disk_img)
os.rmdir(mount_dir)
os.rmdir(self.temp_dir)
self.temp_dir = None
return self
def __exit__(self, exc_type, exc_value, tracebk):
if self.mount_dir:
if self.temp_dir:
umount(self.mount_dir)
os.rmdir(self.mount_dir)
shutil.rmtree(self.temp_dir)
self.mount_dir = None
self.temp_dir = None
execWithRedirect("kpartx", ["-d", "-s", self.disk_img])