def to_path(
self, *, target_to_path: Mapping[str, str], subvolumes_dir: str,
) -> str:
if self.type == 'layer':
out_path = target_to_path.get(self.source)
if out_path is None:
raise AssertionError(
f'MountItem could not resolve {self.source}'
)
subvol = find_built_subvol(out_path, subvolumes_dir=subvolumes_dir)
# If we allowed mounting a layer that has other mounts inside,
# it would force us to support nested mounts. We don't want to
# do this (yet).
if os.path.exists(subvol.path(META_MOUNTS_DIR)):
raise AssertionError(
f'Refusing to mount {subvol.path()} since that would '
'require the tooling to support nested mounts.'
)
return subvol.path()
elif self.type == 'host':
return self.source
else: # pragma: no cover
raise AssertionError(
f'Bad mount source "{self.type}" for {self.source}'
)
def replace_targets_by_paths(x, layer_opts: LayerOpts):
'''
Converts target_tagger.bzl sigils to buck-out paths or Subvol objects.
JSON-serialized image features store single-item dicts of the form
{'__BUCK{_LAYER,}_TARGET': '//target:path'} whenever the compiler
requires a path to another target. This is because actual paths would
break Buck caching, and would not survive repo moves. Then, at runtime,
the compiler receives a dictionary of target-to-path mappings as
`--child-dependencies`, and performs the substitution in any image
feature JSON it consumes.
'''
if type(x) is dict:
if '__BUCK_TARGET' in x or '__BUCK_LAYER_TARGET' in x:
assert len(x) == 1, x
(sigil, target), = x.items()
path = layer_opts.target_to_path.get(target)
if not path:
raise RuntimeError(
f'{target} not in {layer_opts.target_to_path}'
)
return path if sigil == '__BUCK_TARGET' else find_built_subvol(
path, subvolumes_dir=layer_opts.subvolumes_dir,
)
return {
k: replace_targets_by_paths(v, layer_opts) for k, v in x.items()
}
elif type(x) is list:
return [replace_targets_by_paths(v, layer_opts) for v in x]
elif type(x) in [int, float, str, bool, type(None)]:
return x
raise AssertionError(f'Unknown {type(x)} for {x}') # pragma: no cover
def _temp_resource_subvol(self, name: str):
parent_sv = find_built_subvol(load_location(__package__, name))
with TempSubvolumes(sys.argv[0]) as temp_subvols:
# Cannot use `.snapshot()` since that doesn't handle mounts.
child_sv = temp_subvols.caller_will_create(name)
ParentLayerItem.get_phase_builder([
ParentLayerItem(from_target='t', subvol=parent_sv),
], DUMMY_LAYER_OPTS)(child_sv)
yield child_sv
def test_check_layers(self):
meta = {'meta': ['(Dir)', {'private': ['(Dir)', {'opts': ['(Dir)', {
'artifacts_may_require_repo': ['(File d2)'],
}]}]}]}
# The parent has a couple of directories.
self.assertEqual(
['(Dir)', {'a': ['(Dir)', {'b': ['(Dir)', {}]}], **meta}],
render_sendstream(find_built_subvol(
self._resource_path('parent')
).mark_readonly_and_get_sendstream()),
)
# The child is near-empty because the `remove_paths` cleaned it up.
self.assertEqual(
['(Dir)', {**meta}],
render_sendstream(find_built_subvol(
self._resource_path('child')
).mark_readonly_and_get_sendstream()),
)
def test_contents(self):
self.maxDiff = None
sv = find_built_subvol(load_location(__package__, 'install-toy-rpm'))
r = render_sendstream(sv.mark_readonly_and_get_sendstream())
self.assertEqual([
'(Dir)', {'bin': ['(Dir)', {'toy_src_file': ['(File m755 d40)']}]}
], pop_path(r, 'usr'))
check_common_rpm_render(self, r, 'yum')
def test_rpm_metadata_from_subvol(self):
layer_path = os.path.join(os.path.dirname(__file__), 'child-layer')
child_subvol = find_built_subvol(layer_path)
a = RpmMetadata.from_subvol(child_subvol, 'rpm-test-mice')
self.assertEqual(a.name, 'rpm-test-mice')
self.assertEqual(a.epoch, 0)
self.assertEqual(a.version, '0.1')
self.assertEqual(a.release, 'a')
# not installed
with self.assertRaises(RuntimeError):
a = RpmMetadata.from_subvol(child_subvol, 'rpm-test-carrot')
# subvol with no RPM DB
layer_path = os.path.join(os.path.dirname(__file__), 'hello-layer')
hello_subvol = find_built_subvol(layer_path)
with self.assertRaisesRegex(ValueError, ' does not exist$'):
a = RpmMetadata.from_subvol(hello_subvol, 'rpm-test-mice')
def test_install_file_from_layer(self):
layer = find_built_subvol(
Path(__file__).dirname() / 'test-with-one-local-rpm')
path_in_layer = b'rpm_test/cheese2.txt'
item = _install_file_item(
from_target='t',
source={
'layer': layer,
'path': '/' + path_in_layer.decode()
},
dest='cheese2',
)
source_path = layer.path(path_in_layer)
p = _InstallablePath(source_path, ProvidesFile(path='cheese2'), 'a+r')
self.assertEqual((p, ), item.paths)
self.assertEqual(source_path, item.source)
self._check_item(item, {p.provides}, {require_directory('/')})
def test_clone_demo_sendstream(self):
src_subvol = find_built_subvol(load_location(__package__,
'create_ops'))
ci = self._clone_item(
'/',
'/',
omit_outer_dir=True,
pre_existing_dest=True,
subvol=src_subvol,
)
self.assertEqual({require_directory('/')}, set(ci.requires()))
self.assertGreater(len(set(ci.provides())), 1)
with TempSubvolumes(sys.argv[0]) as temp_subvols:
dest_subvol = temp_subvols.create('create_ops')
ci.build(dest_subvol, DUMMY_LAYER_OPTS)
self.assertEqual(
render_subvol(src_subvol),
render_subvol(dest_subvol),
)
def _subvol_from_resource(cls, module, name):
return find_built_subvol(load_location(module, name))
def test_find_built_subvol(self):
with open(find_built_subvol(
# This works in @mode/opt since this artifact is baked into the XAR
os.path.join(os.path.dirname(__file__), 'hello_world_base'),
).path('hello_world')) as f:
self.assertEqual('', f.read())
def layer_resource_subvol(package: AnyStr, name: AnyStr) -> Subvol:
'Docs on the `layer_resource` Buck macro.'
return find_built_subvol(importlib.resources.read_text(package, name))
def get_dummy_layer_opts_ba():
return DUMMY_LAYER_OPTS._replace(
build_appliance=find_built_subvol(load_location(
__package__, 'host-test-build-appliance',
))
)
def _build_appliance() -> Subvol:
return find_built_subvol(load_location(__package__, 'build-appliance'))
def setUpClass(cls):
cls.src_layer = find_built_subvol(
load_location(__package__, 'src-layer'))
