typing: suppress a bunch of potential import-error cases in extensions
As flagged by pytype locally. Either the ImportError is locally handled, or the
imported module was previously determined to be present by `hgave` (for the
phabricator extension), or is handled by the `hgext.convert.subversion` module
when imported (for the `hgext.convert.transport` module).
"""utilities to assist in working with pygit2"""
from mercurial.node import bin, sha1nodeconstants
pygit2_module = None
def get_pygit2():
global pygit2_module
if pygit2_module is None:
try:
import pygit2 as pygit2_module # pytype: disable=import-error
pygit2_module.InvalidSpecError
except (ImportError, AttributeError):
pass
return pygit2_module
def pygit2_version():
mod = get_pygit2()
v = "N/A"
if mod:
try:
v = mod.__version__
except AttributeError:
pass
return b"(pygit2 %s)" % v.encode("utf-8")
def togitnode(n):
"""Wrapper to convert a Mercurial binary node to a unicode hexlified node.
pygit2 and sqlite both need nodes as strings, not bytes.
"""
assert len(n) == 20
return n.hex()
def fromgitnode(n):
"""Opposite of togitnode."""
assert len(n) == 40
return bin(n)
nullgit = togitnode(sha1nodeconstants.nullid)