localrepo: introduce a clone_requirements function
This function take a source repository and return a relevant set of
requirements that should be used by a copy clone.
This will help make the creation of the destination repository during copy
clone simpler.
Differential Revision: https://phab.mercurial-scm.org/D10849
"""utilities to assist in working with pygit2"""
from __future__ import absolute_import
from mercurial.node import bin, hex, sha1nodeconstants
from mercurial import pycompat
pygit2_module = None
def get_pygit2():
global pygit2_module
if pygit2_module is None:
try:
import pygit2 as pygit2_module
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 pycompat.sysstr(hex(n))
def fromgitnode(n):
"""Opposite of togitnode."""
assert len(n) == 40
if pycompat.ispy3:
return bin(n.encode('ascii'))
return bin(n)
nullgit = togitnode(sha1nodeconstants.nullid)