def create_source_overlay(mounts_dir,
scratch_dir,
xfs_info,
storage_info,
mount_target=None):
"""
Context manager that prepares the source system overlay and yields the mount.
"""
api.current_logger().debug(
'Creating source overlay in {scratch_dir} with mounts in {mounts_dir}'.
format(scratch_dir=scratch_dir, mounts_dir=mounts_dir))
try:
_create_mounts_dir(scratch_dir, mounts_dir)
mounts = _prepare_required_mounts(scratch_dir, mounts_dir,
_get_mountpoints(storage_info),
xfs_info)
with mounts.pop('/') as root_mount:
with mounting.OverlayMount(
name='system_overlay', source='/',
workdir=root_mount.target) as root_overlay:
if mount_target:
target = mounting.BindMount(source=root_overlay.target,
target=mount_target)
else:
target = mounting.NullMount(target=root_overlay.target)
with target:
with _build_overlay_mount(root_overlay, mounts) as overlay:
with _mount_dnf_cache(overlay.target):
yield overlay
except Exception:
cleanup_scratch(scratch_dir, mounts_dir)
raise
def create_source_overlay(mounts_dir,
scratch_dir,
xfs_present,
cleanup=True,
detach=False):
"""
Context manager that prepares the source system overlay and yields the mount.
"""
api.current_logger().debug(
'Creating source overlay in {scratch_dir} with mounts in {mounts_dir}'.
format(scratch_dir=scratch_dir, mounts_dir=mounts_dir))
with _prepare_mounts(mounts_dir, scratch_dir, cleanup, detach,
xfs_present) as mounts:
with mounting.OverlayMount(name='source_overlay',
source='/',
workdir=mounts.target) as overlay:
with _mount_dnf_cache(overlay.target):
yield overlay
def _build_overlay_mount(root_mount, mounts):
if not root_mount:
raise StopActorExecutionError(
'Root mount point has not been prepared for overlayfs.')
if not mounts:
yield root_mount
else:
current = mounts.keys()[0]
current_mount = mounts.pop(current)
name = _mount_name(current)
with mounting.OverlayMount(name=name,
source=current,
workdir=current_mount.target) as overlay:
with mounting.BindMount(source=overlay.target,
target=os.path.join(
root_mount.target,
current.lstrip('/'))):
with _build_overlay_mount(root_mount, mounts) as mount:
yield mount
def _overlay_if(condition, name, source, workdir):
if condition:
return mounting.OverlayMount(name=name, source=source, workdir=workdir)
return mounting.NullMount(target=source)