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@@ -38,17 +38,28 @@ def find_previous_release_path(
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otherwise returns None.
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"""
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domain_path = current_release_path.parent
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-
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- # list all releases for the same domain
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- releases = [
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- release_path
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- for release_path in (
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- domain_path / release for release in os.listdir(domain_path)
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- )
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- if release_path.is_dir() and release_path != current_release_path
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+ all_releases = [
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+ release_name for release_name in os.listdir(current_release_path.parent)
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]
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- return sorted(releases)[-1] if releases else None
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+ # make sure all directories follow the naming convention
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+ try:
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+ all_releases_datetime = [
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+ datetime.strptime(release, "%Y-%m-%d") for release in all_releases
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+ ]
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+ except ValueError as e:
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+ msg = "All release folders must be in YYYY-MM-DD format"
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+ raise ValueError(msg) from e
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+
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+ all_releases_datetime = sorted(all_releases_datetime)
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+ current_release_datetime = datetime.strptime(current_release_path.name, "%Y-%m-%d")
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+ index = all_releases_datetime.index(current_release_datetime)
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+
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+ # if the current release is the latest or the only one
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+ if index == 0:
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+ return None
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+
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+ return domain_path / all_releases_datetime[index - 1].strftime("%Y-%m-%d")
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def calculate_checksum(file_path) -> str:
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