view tests/test-simplekeyvaluefile.py @ 41755:a4358f7345b4

context: introduce p[12]copies() methods and debugp[12]copies commands

As mentioned earlier, I'm working on support for storing copy metadata
in the changeset instead of in the filelog.

In order to transition a repo from storing metadata in filelogs to
storing it in the changeset, I'm going to provide a config option for
reading the metadata from the changeset, but falling back to getting
it from the filelog if it's not in the changeset. In this compatiblity
mode, the changeset-optmized algorithms will be used. We will then
need to convert the filelog copy metadata to look like that provided
by changeset copy metadata. This patch introduces methods that do just
that.

By having these methods here, we can start writing changeset-optimized
algorithms that should work already before we add any support for
storing the metadata in the changesets.

This commit also includes new debugp[12]copies commands and exercises
them in test-copies.t.

Differential Revision: https://phab.mercurial-scm.org/D5990

from __future__ import absolute_import

import unittest
import silenttestrunner

from mercurial import (
    error,
    scmutil,
)

class mockfile(object):
    def __init__(self, name, fs):
        self.name = name
        self.fs = fs

    def __enter__(self):
        return self

    def __exit__(self, *args, **kwargs):
        pass

    def write(self, text):
        self.fs.contents[self.name] = text

    def read(self):
        return self.fs.contents[self.name]

class mockvfs(object):
    def __init__(self):
        self.contents = {}

    def read(self, path):
        return mockfile(path, self).read()

    def readlines(self, path):
        # lines need to contain the trailing '\n' to mock the real readlines
        return [l for l in mockfile(path, self).read().splitlines(True)]

    def __call__(self, path, mode, atomictemp):
        return mockfile(path, self)

class testsimplekeyvaluefile(unittest.TestCase):
    def setUp(self):
        self.vfs = mockvfs()

    def testbasicwritingiandreading(self):
        dw = {b'key1': b'value1', b'Key2': b'value2'}
        scmutil.simplekeyvaluefile(self.vfs, b'kvfile').write(dw)
        self.assertEqual(sorted(self.vfs.read(b'kvfile').split(b'\n')),
                         [b'', b'Key2=value2', b'key1=value1'])
        dr = scmutil.simplekeyvaluefile(self.vfs, b'kvfile').read()
        self.assertEqual(dr, dw)

    if not getattr(unittest.TestCase, 'assertRaisesRegex', False):
        # Python 3.7 deprecates the regex*p* version, but 2.7 lacks
        # the regex version.
        assertRaisesRegex = (# camelcase-required
            unittest.TestCase.assertRaisesRegexp)

    def testinvalidkeys(self):
        d = {b'0key1': b'value1', b'Key2': b'value2'}
        with self.assertRaisesRegex(error.ProgrammingError,
                                     'keys must start with a letter.*'):
            scmutil.simplekeyvaluefile(self.vfs, b'kvfile').write(d)

        d = {b'key1@': b'value1', b'Key2': b'value2'}
        with self.assertRaisesRegex(error.ProgrammingError, 'invalid key.*'):
            scmutil.simplekeyvaluefile(self.vfs, b'kvfile').write(d)

    def testinvalidvalues(self):
        d = {b'key1': b'value1', b'Key2': b'value2\n'}
        with self.assertRaisesRegex(error.ProgrammingError,  'invalid val.*'):
            scmutil.simplekeyvaluefile(self.vfs, b'kvfile').write(d)

    def testcorruptedfile(self):
        self.vfs.contents[b'badfile'] = b'ababagalamaga\n'
        with self.assertRaisesRegex(error.CorruptedState,
                                     'dictionary.*element.*'):
            scmutil.simplekeyvaluefile(self.vfs, b'badfile').read()

    def testfirstline(self):
        dw = {b'key1': b'value1'}
        scmutil.simplekeyvaluefile(self.vfs, b'fl').write(dw, firstline=b'1.0')
        self.assertEqual(self.vfs.read(b'fl'), b'1.0\nkey1=value1\n')
        dr = scmutil.simplekeyvaluefile(self.vfs, b'fl')\
                    .read(firstlinenonkeyval=True)
        self.assertEqual(dr, {b'__firstline': b'1.0', b'key1': b'value1'})

if __name__ == "__main__":
    silenttestrunner.main(__name__)