def select_version(versions: List[Version],
*,
spec: NpmSpec = None) -> Optional[Version]:
"""Select a version according to given specification.
Args:
versions: List of versions to parse.
spec: A version specification.
Returns:
The selected version according to ``spec`` or highest version
if ``spec`` is ``None``.
"""
if len(versions) == 0:
return None
if spec is not None:
selected_version = spec.select(versions)
else:
versions.sort()
selected_version = versions[-1]
return selected_version
def checkout_workspace(self, repo: Repository,
repo_info: RepoInfo) -> Workspace:
image_tags = repo.get_all_hashes_tags()
tag_dict = dict((tag, image_hash) for (image_hash, tag) in image_tags
if image_hash) #reverse keys
default_image = repo.images[
tag_dict['latest']] if 'latest' in tag_dict else repo.head
version_list = [
parse_tag(tag)
for tag in sorted(list(tag_dict.keys()), key=len, reverse=True)
]
valid_versions = [version for version in version_list if version]
spec_expr = f'<={repo_info.major}.{repo_info.minor}' if repo_info.minor else f'<={repo_info.major}'
base_ref_spec = NpmSpec(spec_expr)
base_ref = base_ref_spec.select(valid_versions)
if repo_info.prerelease:
assert base_ref, 'Cannot checkout using prerelease until a repo is initialized.'
prerelease_base_version = base_ref.next_patch()
base_ref = NpmSpec(
f'>={str(prerelease_base_version)}-{repo_info.prerelease}'
).select(valid_versions)
image_hash = tag_dict[str(
base_ref)] if base_ref else default_image.image_hash
image = repo.images[image_hash]
image.checkout(force=True)
return Workspace(repo_uri=repo_info.uri,
image_hash=image_hash,
version=base_ref)