bin/remap-hggit-mapfile @ 34084ee62b4a
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author |
Steve Losh <steve@stevelosh.com> |
date |
Fri, 06 Nov 2020 11:01:07 -0500 |
parents |
dcbf704290a1 |
children |
4e0ee24c82a7 |
#!/usr/bin/env python
from __future__ import print_function
import collections
import sys
import subprocess
import pprint
hg_dir = sys.argv[1]
git_dir = sys.argv[2]
nodetempl = "--template={node}\\n"
prettytempl = '--pretty=format:%H'
def log(msg):
sys.stderr.write(str(msg) + '\n')
sys.stderr.flush()
def die(msg):
sys.stderr.write(msg + '\n')
sys.exit(1)
def hg(*args):
l = ["hg", "--repository", hg_dir] + list(args)
return subprocess.check_output(l).strip()
def git(*args):
l = ["git", "-C", git_dir] + list(args)
return subprocess.check_output(l).strip()
def find_hg_root_revision():
rev = hg('log', '-r', 'roots(all())', nodetempl).split()
if len(rev) != 1:
die("Can't determine a single hg root revision.")
return rev[0]
def find_git_root_revision():
rev = git('log', '--max-parents=0', prettytempl).split()
if len(rev) != 1:
die("Can't determine a single git root revision.")
return rev[0]
def find_git_children_mapping():
result = collections.defaultdict(list)
for l in git('rev-list', '--all', '--parents').split('\n'):
parts = l.split()
for parent in parts[1:]:
result[parent].append(parts[0])
return result
def find_hg_children_mapping():
result = collections.defaultdict(list)
for l in hg('log', '--template', '{node} {p1node} {p2node}\\n').split('\n'):
parts = l.split()
for parent in parts[1:]:
if parent != "0000000000000000000000000000000000000":
result[parent].append(parts[0])
return result
def find_hg_children(rev):
return hg('log', '-r', 'children(%s)' % rev, nodetempl).split()
def get_hg_desc(rev):
return hg('log', '-r', rev, '--template={desc}')
def get_git_desc(rev):
return git('log', '--format=%B', '-n', '1', rev)
hg_root = find_hg_root_revision()
git_root = find_git_root_revision()
hg_children_map = find_hg_children_mapping()
git_children_map = find_git_children_mapping()
# hg -> git
mapping = {hg_root: git_root}
todo = [hg_root]
n = 0
while todo:
h = todo.pop()
g = mapping[h]
log("%4d %s %s" % (n, h[:12], g[:12]))
n += 1
hg_children = hg_children_map[h]
git_children = git_children_map[g]
if len(hg_children) == len(git_children) == 0:
log("Head node, no children...")
elif len(hg_children) == len(git_children) == 1:
if hg_children[0] not in mapping:
mapping[hg_children[0]] = git_children[0]
todo.append(hg_children[0])
else:
log("Multiple (%d hg / %d git) children, attempting to differentiate" %
(len(hg_children), len(git_children)))
for hg_child in hg_children:
hg_desc = get_hg_desc(hg_child)
matching = [
git_child for git_child in git_children
if hg_desc.startswith(get_git_desc(git_child).split('\n')[0])
]
if len(matching) == 1:
log("Found a match based on message for %s" % hg_child)
if hg_child not in mapping:
mapping[hg_child] = matching[0]
todo.append(hg_child)
else:
log("already done, skipping...")
elif len(matching) == 0:
log("no match found...")
else:
log("multiple matches found...")
for h, g in mapping.items():
print(g, h)