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Handle SHA-256 zero OIDs in pre-push #3692

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Sean-Kenneth-Doherty wants to merge 1 commit into from
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Handle SHA-256 zero OIDs in pre-push #3692

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10 changes: 8 additions & 2 deletions pre_commit/commands/hook_impl.py
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,8 @@
from pre_commit.store import Store

Z40 = '0' * 40
Z64 = '0' * 64
ZERO_OIDS = frozenset((Z40, Z64))


def _run_legacy(
Expand Down Expand Up @@ -117,6 +119,10 @@ def _rev_exists(rev: str) -> bool:
return not subprocess.call(('git', 'rev-list', '--quiet', rev))


def _is_zero_oid(oid: str) -> bool:
return oid in ZERO_OIDS


def _pre_push_ns(
color: bool,
args: Sequence[str],
Expand All @@ -128,9 +134,9 @@ def _pre_push_ns(
for line in stdin.decode().splitlines():
parts = line.rsplit(maxsplit=3)
local_branch, local_sha, remote_branch, remote_sha = parts
if local_sha == Z40:
if _is_zero_oid(local_sha):
continue
elif remote_sha != Z40 and _rev_exists(remote_sha):
elif not _is_zero_oid(remote_sha) and _rev_exists(remote_sha):
return _ns(
'pre-push', color,
from_ref=remote_sha, to_ref=local_sha,
Expand Down
11 changes: 11 additions & 0 deletions tests/commands/hook_impl_test.py
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Original file line number Diff line number Diff line change
Expand Up @@ -347,6 +347,17 @@ def test_run_ns_pre_push_deleting_branch(push_example):
assert ns is None


def test_run_ns_pre_push_deleting_branch_sha256(push_example):
src, src_head, clone, _ = push_example

with cwd(clone):
args = ('origin', src)
stdin = f'(delete) {hook_impl.Z64} refs/heads/b {src_head}'.encode()
ns = hook_impl._run_ns('pre-push', False, args, stdin)

assert ns is None


def test_hook_impl_main_noop_pre_push(cap_out, store, push_example):
src, src_head, clone, _ = push_example

Expand Down
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