view tests/fakepatchtime.py @ 43494:5d40317d42b7

dirs: reject consecutive slashes in paths

We shouldn't ever see those, and the fuzzer go really excited that if
it gives us a 65k string with 55k slashes in it we use a lot of RAM.

This is a better fix than what I tried in D7105. It was suggested by
Yuya, and I verified it does in fact cause the fuzzer to not OOM.

This is a revision of D7234, but with the missing set of an error
added. I added a unit test of the dirs behavior because I needed to
reason more carefully about the failure modes around consecutive
slashes.

Differential Revision: https://phab.mercurial-scm.org/D7252

# extension to emulate invoking 'patch.internalpatch()' at the time
# specified by '[fakepatchtime] fakenow'

from __future__ import absolute_import

from mercurial import (
    extensions,
    patch as patchmod,
    registrar,
)
from mercurial.utils import dateutil

configtable = {}
configitem = registrar.configitem(configtable)

configitem(
    b'fakepatchtime', b'fakenow', default=None,
)


def internalpatch(
    orig,
    ui,
    repo,
    patchobj,
    strip,
    prefix=b'',
    files=None,
    eolmode=b'strict',
    similarity=0,
):
    if files is None:
        files = set()
    r = orig(
        ui,
        repo,
        patchobj,
        strip,
        prefix=prefix,
        files=files,
        eolmode=eolmode,
        similarity=similarity,
    )

    fakenow = ui.config(b'fakepatchtime', b'fakenow')
    if fakenow:
        # parsing 'fakenow' in YYYYmmddHHMM format makes comparison between
        # 'fakenow' value and 'touch -t YYYYmmddHHMM' argument easy
        fakenow = dateutil.parsedate(fakenow, [b'%Y%m%d%H%M'])[0]
        for f in files:
            repo.wvfs.utime(f, (fakenow, fakenow))

    return r


def extsetup(ui):
    extensions.wrapfunction(patchmod, 'internalpatch', internalpatch)