def validate_merge_bases_with_default_branch(
cli: CLIUX, repo: Repo, active_branch_name: str,
default_branch_name: str) -> Commit:
merge_bases = repo.merge_base(default_branch_name, active_branch_name)
merge_bases_csv = ", ".join(map(lambda c: c.hexsha[0:8], merge_bases))
cli.debug(f"merge_bases: {merge_bases_csv}")
num_merge_bases = len(merge_bases)
if (num_merge_bases == 0):
raise UnhandledSituationException(
'No merge-base commit found',
f"""No merge-base commits between branches {format_branch_name(default_branch_name) } and {
format_branch_name(active_branch_name) } could be found, so validation could not be performed."""
)
if (num_merge_bases > 1):
description = " ".join([
f"Multiple ({format_integer(num_merge_bases)}) merge-base commits between branches",
format_branch_name(default_branch_name), "and",
format_branch_name(active_branch_name), "were found:"
])
commits_description = reduce(lambda a, b: f"{a}\n- {b}",
map(format_commit, merge_bases), "")
raise UnhandledSituationException('Multiple merge-base commits found',
description + commits_description)
return merge_bases[0]
