wireprotov2: client support for following content redirects
And with the server actually sending content redirects, it is finally
time to implement client support for following them!
When a redirect response is seen, we wait until all data for that
request has been received (it should be nearly immediate since no
data is expected to follow the redirect message). Then we use
a URL opener to make a request. We stuff that response into the
client handler and construct a new response object to track it.
When readdata() is called for servicing requests, we attempt to
read data from the first redirected response. During data reading,
data is processed similarly to as if it came from a frame payload.
The existing test for the functionality demonstrates the client
transparently following the redirect and obtaining the command
response data from an alternate URL!
There is still plenty of work to do here, including shoring up
testing. I'm not convinced things will work in the presence of
multiple redirect responses. And we don't yet implement support
for integrity verification or configuring server certificates
to validate the connection. But it's a start. And it should enable
us to start experimenting with "real" caches.
Differential Revision: https://phab.mercurial-scm.org/D4778
# uncommit - undo the actions of a commit
#
# Copyright 2011 Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
# Logilab SA <contact@logilab.fr>
# Pierre-Yves David <pierre-yves.david@ens-lyon.org>
# Patrick Mezard <patrick@mezard.eu>
# Copyright 2016 Facebook, Inc.
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
"""uncommit part or all of a local changeset (EXPERIMENTAL)
This command undoes the effect of a local commit, returning the affected
files to their uncommitted state. This means that files modified, added or
removed in the changeset will be left unchanged, and so will remain modified,
added and removed in the working directory.
"""
from __future__ import absolute_import
from mercurial.i18n import _
from mercurial import (
cmdutil,
commands,
context,
copies,
error,
node,
obsutil,
pycompat,
registrar,
rewriteutil,
scmutil,
)
cmdtable = {}
command = registrar.command(cmdtable)
configtable = {}
configitem = registrar.configitem(configtable)
configitem('experimental', 'uncommitondirtywdir',
default=False,
)
# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
# extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
# be specifying the version(s) of Mercurial they are tested with, or
# leave the attribute unspecified.
testedwith = 'ships-with-hg-core'
def _commitfiltered(repo, ctx, match, keepcommit):
"""Recommit ctx with changed files not in match. Return the new
node identifier, or None if nothing changed.
"""
base = ctx.p1()
# ctx
initialfiles = set(ctx.files())
exclude = set(f for f in initialfiles if match(f))
# No files matched commit, so nothing excluded
if not exclude:
return None
files = (initialfiles - exclude)
# return the p1 so that we don't create an obsmarker later
if not keepcommit:
return ctx.parents()[0].node()
# Filter copies
copied = copies.pathcopies(base, ctx)
copied = dict((dst, src) for dst, src in copied.iteritems()
if dst in files)
def filectxfn(repo, memctx, path, contentctx=ctx, redirect=()):
if path not in contentctx:
return None
fctx = contentctx[path]
mctx = context.memfilectx(repo, memctx, fctx.path(), fctx.data(),
fctx.islink(),
fctx.isexec(),
copied=copied.get(path))
return mctx
new = context.memctx(repo,
parents=[base.node(), node.nullid],
text=ctx.description(),
files=files,
filectxfn=filectxfn,
user=ctx.user(),
date=ctx.date(),
extra=ctx.extra())
return repo.commitctx(new)
def _fixdirstate(repo, oldctx, newctx, status):
""" fix the dirstate after switching the working directory from oldctx to
newctx which can be result of either unamend or uncommit.
"""
ds = repo.dirstate
copies = dict(ds.copies())
s = status
for f in s.modified:
if ds[f] == 'r':
# modified + removed -> removed
continue
ds.normallookup(f)
for f in s.added:
if ds[f] == 'r':
# added + removed -> unknown
ds.drop(f)
elif ds[f] != 'a':
ds.add(f)
for f in s.removed:
if ds[f] == 'a':
# removed + added -> normal
ds.normallookup(f)
elif ds[f] != 'r':
ds.remove(f)
# Merge old parent and old working dir copies
oldcopies = {}
for f in (s.modified + s.added):
src = oldctx[f].renamed()
if src:
oldcopies[f] = src[0]
oldcopies.update(copies)
copies = dict((dst, oldcopies.get(src, src))
for dst, src in oldcopies.iteritems())
# Adjust the dirstate copies
for dst, src in copies.iteritems():
if (src not in newctx or dst in newctx or ds[dst] != 'a'):
src = None
ds.copy(src, dst)
@command('uncommit',
[('', 'keep', False, _('allow an empty commit after uncommiting')),
] + commands.walkopts,
_('[OPTION]... [FILE]...'))
def uncommit(ui, repo, *pats, **opts):
"""uncommit part or all of a local changeset
This command undoes the effect of a local commit, returning the affected
files to their uncommitted state. This means that files modified or
deleted in the changeset will be left unchanged, and so will remain
modified in the working directory.
If no files are specified, the commit will be pruned, unless --keep is
given.
"""
opts = pycompat.byteskwargs(opts)
with repo.wlock(), repo.lock():
if not pats and not repo.ui.configbool('experimental',
'uncommitondirtywdir'):
cmdutil.bailifchanged(repo)
old = repo['.']
rewriteutil.precheck(repo, [old.rev()], 'uncommit')
if len(old.parents()) > 1:
raise error.Abort(_("cannot uncommit merge changeset"))
with repo.transaction('uncommit'):
match = scmutil.match(old, pats, opts)
keepcommit = opts.get('keep') or pats
newid = _commitfiltered(repo, old, match, keepcommit)
if newid is None:
ui.status(_("nothing to uncommit\n"))
return 1
mapping = {}
if newid != old.p1().node():
# Move local changes on filtered changeset
mapping[old.node()] = (newid,)
else:
# Fully removed the old commit
mapping[old.node()] = ()
scmutil.cleanupnodes(repo, mapping, 'uncommit', fixphase=True)
with repo.dirstate.parentchange():
repo.dirstate.setparents(newid, node.nullid)
s = old.p1().status(old, match=match)
_fixdirstate(repo, old, repo[newid], s)
def predecessormarkers(ctx):
"""yields the obsolete markers marking the given changeset as a successor"""
for data in ctx.repo().obsstore.predecessors.get(ctx.node(), ()):
yield obsutil.marker(ctx.repo(), data)
@command('^unamend', [])
def unamend(ui, repo, **opts):
"""undo the most recent amend operation on a current changeset
This command will roll back to the previous version of a changeset,
leaving working directory in state in which it was before running
`hg amend` (e.g. files modified as part of an amend will be
marked as modified `hg status`)
"""
unfi = repo.unfiltered()
with repo.wlock(), repo.lock(), repo.transaction('unamend'):
# identify the commit from which to unamend
curctx = repo['.']
rewriteutil.precheck(repo, [curctx.rev()], 'unamend')
# identify the commit to which to unamend
markers = list(predecessormarkers(curctx))
if len(markers) != 1:
e = _("changeset must have one predecessor, found %i predecessors")
raise error.Abort(e % len(markers))
prednode = markers[0].prednode()
predctx = unfi[prednode]
# add an extra so that we get a new hash
# note: allowing unamend to undo an unamend is an intentional feature
extras = predctx.extra()
extras['unamend_source'] = curctx.hex()
def filectxfn(repo, ctx_, path):
try:
return predctx.filectx(path)
except KeyError:
return None
# Make a new commit same as predctx
newctx = context.memctx(repo,
parents=(predctx.p1(), predctx.p2()),
text=predctx.description(),
files=predctx.files(),
filectxfn=filectxfn,
user=predctx.user(),
date=predctx.date(),
extra=extras)
newprednode = repo.commitctx(newctx)
newpredctx = repo[newprednode]
dirstate = repo.dirstate
with dirstate.parentchange():
dirstate.setparents(newprednode, node.nullid)
s = repo.status(predctx, curctx)
_fixdirstate(repo, curctx, newpredctx, s)
mapping = {curctx.node(): (newprednode,)}
scmutil.cleanupnodes(repo, mapping, 'unamend', fixphase=True)