Diff two repositories, file by file, to verify they're the same. Output all diffs if there are any. Written out of our mutual distrust of destructive, history-modifying mercurial extensions.

diff-repos.py

#!/usr/bin/env python

# authors: @stantonk, @salubriousdave
import os
import sys
import subprocess

def is_hg_repo(path):
    hgchkpath = os.path.join(path, '.hg')
    return os.path.exists(hgchkpath)

def in_ignore_list(filename):
    ignorelist = ('.pyc', '.txt', 'Makefile', 'settings_local.py', '.venv')

    for i in ignorelist:
        if i in filename:
            return True
    return False

def get_rel_paths(repo_root):
    cwd = os.getcwd()
    os.chdir(repo_root)
    inner_path = '.'

    if not is_hg_repo(inner_path):
        print 'not hg repo'
        sys.exit(1)

    filebag = set()
    for dirname, _, files in os.walk(inner_path):
        if '/.hg' in dirname:
            continue

        for f in files:
            if in_ignore_list(f):
                continue
            filebag.add(os.path.join(dirname, f))

    os.chdir(cwd)
    return filebag

def mash_paths(root, fpath):
    return root + fpath

def files_same(a, b):
    args = ['diff', a, b]
    rc = subprocess.call(args, stderr=subprocess.STDOUT)
    return not bool(rc)


if __name__ == '__main__':
    repo_a_root, repo_b_root = sys.argv[1:3]
    repo_a_files = get_rel_paths(repo_a_root)
    repo_b_files = get_rel_paths(repo_b_root)

    if repo_a_files != repo_b_files:
        print 'omergerddd ddiediedie'

        diff = repo_a_files - repo_b_files
        if diff:
            print 'a vs b:'
            for d in diff:
                print d

        diff = repo_b_files - repo_a_files
        if diff:
            print 'b vs a:'
            for d in diff:
                print d

        print 'error: differences!'
        sys.exit(1)

    failures = []
    for f in repo_a_files:
        if not files_same(mash_paths(repo_a_root, f), mash_paths(repo_b_root, f)):
            failures.append(f)

    if not failures:
        print 'repositories are exactly the same'
    else:
        for f in failures:
            print 'not same: %s' % f