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svn2github.py
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svn2github.py
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#!/usr/bin/env python3
import subprocess as proc
from subprocess import DEVNULL, PIPE, Popen
import re
from collections import namedtuple
import os
import tempfile
import shutil
import sys
import argparse
class Svn2GithubException(Exception):
pass
GitSvnInfo = namedtuple('GitSvnInfo', 'svn_url svn_revision svn_uuid')
def get_last_revision_from_svn(svn_url):
result = proc.run(["svn", "info", svn_url], check=True, stderr=DEVNULL, stdin=DEVNULL, stdout=PIPE)
pattern = re.compile("^Revision: ([0-9]+)$".encode())
for line in result.stdout.split("\n".encode()):
m = pattern.match(line)
if m:
return int(m.group(1))
return Svn2GithubException("svn info {} output did not specify the current revision".format(svn_url))
def run_git_cmd(args, git_dir):
return proc.run(["git"] + args, check=True, cwd=git_dir, stderr=DEVNULL, stdin=DEVNULL, stdout=PIPE)
def is_repo_empty(git_dir):
result = proc.run(["ls", ".git/refs/heads"], check=True, cwd=git_dir, stderr=DEVNULL, stdin=DEVNULL, stdout=PIPE)
return len(result.stdout) == 0
def get_svn_info_from_git(git_dir):
result = run_git_cmd(["log", "-1", "HEAD", "--pretty=%b"], git_dir=git_dir)
pattern = re.compile("^git-svn-id: (.*)@([0-9]+) ([0-9a-f-]{36})$".encode())
for line in result.stdout.split("\n".encode()):
m = pattern.match(line)
if m:
return GitSvnInfo(svn_url=m.group(1), svn_revision=int(m.group(2)), svn_uuid=m.group(3))
return Svn2GithubException("git log -1 HEAD --pretty=%b output did not specify the current revision")
def git_svn_init(git_svn_info, git_dir):
if git_svn_info.svn_uuid:
rewrite_uuid = ["--rewrite-uuid", git_svn_info.svn_uuid]
else:
rewrite_uuid = []
run_git_cmd(["svn", "init"] + rewrite_uuid + [git_svn_info.svn_url], git_dir)
def git_svn_rebase(git_dir):
run_git_cmd(["svn", "rebase"], git_dir)
def git_svn_fetch(git_dir):
cmd = Popen(["git", "svn", "fetch"], cwd=git_dir, stdin=DEVNULL, stdout=PIPE, stderr=DEVNULL, universal_newlines=True)
pattern = re.compile("^r([0-9]+) = [0-9a-f]{40}")
while True:
line = cmd.stdout.readline()
if not line:
break
m = pattern.match(line)
if m:
yield int(m.group(1))
def git_clone(git_src, git_dir):
os.makedirs(git_dir, exist_ok=False)
run_git_cmd(["clone", git_src, "."], git_dir)
def git_push(git_dir):
run_git_cmd(["push", "origin", "master"], git_dir)
def unpack_cache(cache_path, git_dir):
dot_git_dir = os.path.join(git_dir, ".git")
os.makedirs(dot_git_dir, exist_ok=False)
proc.run(["tar", "-xf", cache_path], check=True, cwd=dot_git_dir, stderr=DEVNULL, stdin=DEVNULL, stdout=DEVNULL)
run_git_cmd(["config", "core.bare", "false"], git_dir)
run_git_cmd(["checkout", "."], git_dir)
def save_cache(cache_path, tmp_path, git_dir):
dot_git_dir = os.path.join(git_dir, ".git")
proc.run(["tar", "-cf", tmp_path, "."], check=True, cwd=dot_git_dir, stderr=DEVNULL, stdin=DEVNULL, stdout=DEVNULL)
shutil.copyfile(tmp_path, cache_path)
def sync_github_mirror(github_repo, cache_dir, new_svn_url=None):
if cache_dir:
os.makedirs(cache_dir, exist_ok=True)
cache_path = os.path.join(cache_dir, "cache." + github_repo.replace("/", ".") + ".tar")
cached = os.path.exists(cache_path)
else:
cached = False
github_url = "git@github.com:" + github_repo + ".git"
with tempfile.TemporaryDirectory(prefix="svn2github-") as tmp_dir:
git_dir = os.path.join(tmp_dir, "repo")
if cached and not new_svn_url:
print("Using cached Git repository from " + cache_path)
unpack_cache(cache_path, git_dir)
else:
print("Cloning " + github_url)
git_clone(github_url, git_dir)
if new_svn_url:
if not is_repo_empty(git_dir):
raise Svn2GithubException("Specifed new_svn_url, but the destination repo is not empty")
git_svn_info = GitSvnInfo(svn_url=new_svn_url, svn_revision=0, svn_uuid=None)
else:
git_svn_info = get_svn_info_from_git(git_dir)
print("Checking for SVN updates")
upstream_revision = get_last_revision_from_svn(git_svn_info.svn_url)
print("Last upstream revision: " + str(upstream_revision))
print("Last mirrored revision: " + str(git_svn_info.svn_revision))
if upstream_revision == git_svn_info.svn_revision:
print("Everything up to date. Bye!")
return
print("Fetching from SVN", end="")
if not cached or new_svn_url:
git_svn_init(git_svn_info, git_dir)
for rev in git_svn_fetch(git_dir):
print("\rFetching from SVN, revision {}/{}".format(rev, upstream_revision), end="")
print()
print("Rebasing SVN changes")
git_svn_rebase(git_dir)
print("Pushing to GitHub")
git_push(git_dir)
if cache_dir:
print("Saving Git directory to cache")
save_cache(cache_path, os.path.join(tmp_dir, "cache.tar"), git_dir)
def main():
parser = argparse.ArgumentParser(description="Mirror SVN repositories to GitHub")
parser.add_argument("--cache-dir", help="Directory to keep the cached data to avoid re-downloading all SVN and Git history each time. This is optional, but highly recommended")
subparsers = parser.add_subparsers()
subparser_import = subparsers.add_parser("import", help="Import SVN repository to the GitHub repo")
subparser_import.add_argument("github_repo", metavar="GITHUB_REPO", help="GitHub repo in format: user/name")
subparser_import.add_argument("svn_url", metavar="SVN_URL", help="SVN repository to import")
subparser_update = subparsers.add_parser("update", help="Update the GitHub repository from SVN")
subparser_update.add_argument("github_repo", metavar="GITHUB_REPO", help="GitHub repo in format: user/name")
args = parser.parse_args(sys.argv[1:] or ["--help"])
new_svn_url = args.svn_url if "svn_url" in args else None
sync_github_mirror(args.github_repo, args.cache_dir, new_svn_url=new_svn_url)
if __name__ == "__main__":
main()