def _create_root_dir(container_dir, localdisk):
"""Prepares chrooted environment."""
# Create root directory structure (chroot base).
# container_dir/<subdir>
root_dir = os.path.join(container_dir, 'root')
already_initialized = fs_linux.blk_fs_test(localdisk['block_dev'])
if not already_initialized:
# Format the block device
fs_linux.blk_fs_create(localdisk['block_dev'])
_LOGGER.info('Creating container root directory: %s', root_dir)
# Creates directory that will serve as new root.
fs.mkdir_safe(fs.norm_safe(root_dir))
# Unshare the mount namespace
unshare.unshare(unshare.CLONE_NEWNS)
# Mount the container root volume
fs_linux.mount_filesystem(localdisk['block_dev'], root_dir)
return root_dir
def chroot_init(newroot):
"""Prepares the file system for subsequent chroot.
- Unshares mount subsystem.
- Creates directory that will serve as new root.
:param newroot:
Path to the intended root dir of the chroot environment
:type newroot:
``str``
:returns:
Normalized path to the new root dir
:rtype:
``str``
"""
# Make sure new root is valid argument.
newroot_norm = norm_safe(newroot)
# Creates directory that will serve as new root.
mkdir_safe(newroot_norm)
# Unshare the mount namespace
unshare.unshare(unshare.CLONE_NEWNS)
return newroot_norm
def _create_root_dir(tm_env, container_dir, root_dir, app):
"""Prepares chrooted environment."""
# Generate a unique name for the app
unique_name = appcfg.app_unique_name(app)
# First wait for the block device to be ready
localdisk_client = tm_env.svc_localdisk.make_client(
os.path.join(container_dir, 'localdisk'))
localdisk = localdisk_client.wait(unique_name)
already_initialized = fs.test_filesystem(localdisk['block_dev'])
if not already_initialized:
# Format the block device
fs.create_filesystem(localdisk['block_dev'])
_LOGGER.info('Creating container root directory: %s', root_dir)
# Creates directory that will serve as new root.
fs.mkdir_safe(fs.norm_safe(root_dir))
# Unshare the mount namespace
unshare.unshare(unshare.CLONE_NEWNS)
# Mount the container root volume
fs.mount_filesystem(localdisk['block_dev'], root_dir)