mirror of
https://github.com/facebook/sapling.git
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652cc9c160
Summary: See also D5271419. Decorators in `bundle2` and `exchange` are not side-effect free. Move them to `uisetup` for better chg compatibility. Reviewed By: StanislavGlebik Differential Revision: D18926783 fbshipit-source-id: 9855b8debe3f809139a9fc3c6eea2775a1562cfd
388 lines
12 KiB
Python
388 lines
12 KiB
Python
# Copyright (c) Facebook, Inc. and its affiliates.
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2.
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# gitlookup.py - server-side support for hg->git and git->hg lookups
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""" extension that will look up hashes from an hg-git map file over the wire.
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This also provides client and server commands to download all the Git
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metadata via bundle2. Example usage:
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- get the git equivalent of hg 47d743e068523a9346a5ea4e429eeab185c886c6
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hg identify --id -r\\
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_gitlookup_hg_47d743e068523a9346a5ea4e429eeab185c886c6\\
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ssh://server/repo
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- get the hg equivalent of git 6916a3c30f53878032dea8d01074d8c2a03927bd
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hg identify --id -r\\
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_gitlookup_git_6916a3c30f53878032dea8d01074d8c2a03927bd\\
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ssh://server/repo
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::
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[gitlookup]
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# Define the location of the map file with the mapfile config option.
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mapfile = <location of map file>
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# The config option onlymapdelta controls how the server handles the hg-git
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# map. A True value corresponds to serving only missing map data while False
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# corresponds to serving the complete map.
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onlymapdelta = False
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# Some repos might have missing hashes in the gitmap and there is no way
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# to go back and fix them. We can safely skip them in the verification part
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# of gitgetmeta.
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skiphashes = []
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"""
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import errno
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import json
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from edenscm.mercurial import (
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bundle2,
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encoding,
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error,
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exchange,
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extensions,
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hg,
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localrepo,
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registrar,
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util,
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wireproto,
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)
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from edenscm.mercurial.i18n import _
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from edenscm.mercurial.node import bin, hex, nullid
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cmdtable = {}
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command = registrar.command(cmdtable)
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def wrapwireprotocommand(command, wrapper):
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"""Wrap the wire proto command named `command' in table
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Just like extensions.wrapcommand, except for wire protocol commands.
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"""
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assert util.safehasattr(wrapper, "__call__")
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origfn, args = wireproto.commands[command]
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def wrap(*args, **kwargs):
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return util.checksignature(wrapper)(
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util.checksignature(origfn), *args, **kwargs
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)
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wireproto.commands[command] = wrap, args
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return wrapper
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def remotelookup(orig, repo, proto, key):
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k = encoding.tolocal(key)
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if k.startswith("_gitlookup_"):
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ret = _dolookup(repo, k)
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if ret is not None:
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success = 1
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else:
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success = 0
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ret = "gitlookup failed"
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return "%s %s\n" % (success, ret)
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return orig(repo, proto, key)
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def locallookup(orig, repo, key):
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gitlookup = _dolookup(repo, key)
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if gitlookup:
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return bin(gitlookup)
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else:
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return orig(repo, key)
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def _dolookup(repo, key):
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mapfile = repo.ui.configpath("gitlookup", "mapfile")
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if mapfile is None:
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return None
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if not isinstance(key, str):
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return None
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# direction: git to hg = g, hg to git = h
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if key.startswith("_gitlookup_git_"):
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direction = "tohg"
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sha = key[15:]
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elif key.startswith("_gitlookup_hg_"):
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direction = "togit"
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sha = key[14:]
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else:
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return None
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if direction == "togit":
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# we've started recording the hg hash in extras.
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try:
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ctx = repo[sha]
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except error.RepoLookupError as e:
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if "unknown revision" in str(e):
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return None
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raise e
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fromextra = ctx.extra().get("convert_revision", "")
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if fromextra:
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return fromextra
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hggitmap = open(mapfile, "rb")
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for line in hggitmap:
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gitsha, hgsha = line.strip().split(" ", 1)
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if direction == "tohg" and sha == gitsha:
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return hgsha
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if direction == "togit" and sha == hgsha:
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return gitsha
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return None
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@command("gitgetmeta", [], "[SOURCE]")
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def gitgetmeta(ui, repo, source="default"):
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"""get git metadata from a server that supports fb_gitmeta"""
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source, branch = hg.parseurl(ui.expandpath(source))
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other = hg.peer(repo, {}, source)
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ui.status(_("getting git metadata from %s\n") % util.hidepassword(source))
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kwargs = {"bundlecaps": exchange.caps20to10(repo)}
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capsblob = bundle2.encodecaps(bundle2.getrepocaps(repo))
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kwargs["bundlecaps"].add("bundle2=" + util.urlreq.quote(capsblob))
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# this would ideally not be in the bundlecaps at all, but adding new kwargs
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# for wire transmissions is not possible as of Mercurial d19164a018a1
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kwargs["bundlecaps"].add("fb_gitmeta")
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kwargs["heads"] = [nullid]
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kwargs["cg"] = False
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kwargs["common"] = _getcommonheads(repo)
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bundle = other.getbundle("pull", **kwargs)
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try:
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op = bundle2.processbundle(repo, bundle)
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except error.BundleValueError as exc:
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raise error.Abort("missing support for %s" % exc)
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writebytes = op.records["fb:gitmeta:writebytes"]
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ui.status(_("wrote %d files (%d bytes)\n") % (len(writebytes), sum(writebytes)))
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hgheadsfile = "git-synced-hgheads"
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gitmapfile = "git-mapfile"
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gitmetafiles = set([gitmapfile, "git-named-branches", "git-tags", "git-remote-refs"])
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def _getfile(repo, filename):
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try:
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return repo.localvfs(filename)
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except (IOError, OSError) as e:
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if e.errno != errno.ENOENT:
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repo.ui.warn(_("warning: unable to read %s: %s\n") % (filename, e))
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return None
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def _getcommonheads(repo):
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commonheads = []
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f = _getfile(repo, hgheadsfile)
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if f:
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commonheads = f.readlines()
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commonheads = [bin(x.strip()) for x in commonheads]
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return commonheads
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def _isheadmissing(repo, heads):
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return not all(repo.known(heads))
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def _getmissinglines(mapfile, missinghashes):
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missinglines = set()
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# Avoid expensive lookup through the map file if there is no missing hash.
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if not missinghashes:
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return missinglines
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linelen = 82
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hashestofind = missinghashes.copy()
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content = mapfile.read()
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if len(content) % linelen != 0:
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raise error.Abort(_("gitmeta: invalid mapfile length (%s)") % len(content))
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# Walk backwards through the map file, since recent commits are added at the
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# end.
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count = len(content) / linelen
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for i in range(count - 1, -1, -1):
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offset = i * linelen
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line = content[offset : offset + linelen]
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hgsha = line[41:81]
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if hgsha in hashestofind:
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missinglines.add(line)
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# Return the missing lines if we found all of them.
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hashestofind.remove(hgsha)
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if not hashestofind:
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return missinglines
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raise error.Abort(_("gitmeta: missing hashes in file %s") % mapfile.name)
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class _githgmappayload(object):
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def __init__(self, needfullsync, newheads, missinglines):
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self.needfullsync = needfullsync
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self.newheads = newheads
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self.missinglines = missinglines
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def _todict(self):
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d = {}
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d["needfullsync"] = self.needfullsync
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d["newheads"] = list(self.newheads)
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d["missinglines"] = list(self.missinglines)
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return d
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def tojson(self):
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return json.dumps(self._todict())
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@classmethod
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def _fromdict(cls, d):
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needfullsync = d["needfullsync"]
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newheads = set(d["newheads"])
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missinglines = set(d["missinglines"])
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return cls(needfullsync, newheads, missinglines)
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@classmethod
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def fromjson(cls, jsonstr):
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d = json.loads(jsonstr)
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return cls._fromdict(d)
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def _exchangesetup():
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@exchange.getbundle2partsgenerator("b2x:fb:gitmeta:githgmap")
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def _getbundlegithgmappart(bundler, repo, source, bundlecaps=None, **kwargs):
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"""send missing git to hg map data via bundle2"""
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if "fb_gitmeta" in bundlecaps:
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# Do nothing if the config indicates serving the complete git-hg map
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# file. _getbundlegitmetapart will handle serving the complete file in
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# this case.
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if not repo.ui.configbool("gitlookup", "onlymapdelta", False):
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return
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mapfile = _getfile(repo, gitmapfile)
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if not mapfile:
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return
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commonheads = kwargs["common"]
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# If there are missing heads, we will sync everything.
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if _isheadmissing(repo, commonheads):
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commonheads = []
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needfullsync = len(commonheads) == 0
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heads = repo.heads()
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newheads = set(hex(head) for head in heads)
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missingcommits = repo.changelog.findmissing(commonheads, heads)
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missinghashes = set(hex(commit) for commit in missingcommits)
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missinghashes.difference_update(
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set(repo.ui.configlist("gitlookup", "skiphashes", []))
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)
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missinglines = _getmissinglines(mapfile, missinghashes)
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payload = _githgmappayload(needfullsync, newheads, missinglines)
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serializedpayload = payload.tojson()
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part = bundle2.bundlepart(
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"b2x:fb:gitmeta:githgmap",
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[("filename", gitmapfile)],
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data=serializedpayload,
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)
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bundler.addpart(part)
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@exchange.getbundle2partsgenerator("b2x:fb:gitmeta")
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def _getbundlegitmetapart(bundler, repo, source, bundlecaps=None, **kwargs):
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"""send git metadata via bundle2"""
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if "fb_gitmeta" in bundlecaps:
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filestooverwrite = gitmetafiles
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# Exclude the git-hg map file if the config indicates that the server
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# should only be serving the missing map data. _getbundle2partsgenerator
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# will serve the missing map data in this case.
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if repo.ui.configbool("gitlookup", "onlymapdelta", False):
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filestooverwrite = filestooverwrite - set([gitmapfile])
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for fname in sorted(filestooverwrite):
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f = _getfile(repo, fname)
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if not f:
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continue
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part = bundle2.bundlepart(
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"b2x:fb:gitmeta", [("filename", fname)], data=f.read()
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)
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bundler.addpart(part)
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def _writefile(op, filename, data):
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with op.repo.localvfs(filename, "w+", atomictemp=True) as f:
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op.repo.ui.note(_("writing .hg/%s\n") % filename)
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f.write(data)
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op.records.add("fb:gitmeta:writebytes", len(data))
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def _validatepartparams(op, params):
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if "filename" not in params:
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raise error.Abort(_("gitmeta: 'filename' missing"))
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fname = params["filename"]
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if fname not in gitmetafiles:
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op.repo.ui.warn(_("warning: gitmeta: unknown file '%s' skipped\n") % fname)
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return False
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return True
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def _bundlesetup():
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@bundle2.parthandler("b2x:fb:gitmeta:githgmap", ("filename",))
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@bundle2.parthandler("fb:gitmeta:githgmap", ("filename",))
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def bundle2getgithgmap(op, part):
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params = dict(part.mandatoryparams)
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if _validatepartparams(op, params):
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filename = params["filename"]
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with op.repo.wlock():
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data = _githgmappayload.fromjson(part.read())
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missinglines = data.missinglines
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# No need to update anything if already in sync.
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if not missinglines:
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return
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if data.needfullsync:
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newlines = missinglines
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else:
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mapfile = _getfile(op.repo, filename)
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if mapfile:
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currentlines = set(mapfile.readlines())
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if currentlines & missinglines:
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msg = "warning: gitmeta: unexpected lines in .hg/%s\n"
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op.repo.ui.warn(_(msg) % filename)
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currentlines.update(missinglines)
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newlines = currentlines
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else:
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raise error.Abort(
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_("gitmeta: could not read from .hg/%s") % filename
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)
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_writefile(op, filename, "".join(newlines))
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_writefile(op, hgheadsfile, "\n".join(data.newheads))
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@bundle2.parthandler("b2x:fb:gitmeta", ("filename",))
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@bundle2.parthandler("fb:gitmeta", ("filename",))
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def bundle2getgitmeta(op, part):
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"""unbundle a bundle2 containing git metadata on the client"""
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params = dict(part.mandatoryparams)
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if _validatepartparams(op, params):
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filename = params["filename"]
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with op.repo.wlock():
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data = part.read()
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_writefile(op, filename, data)
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def extsetup(ui):
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wrapwireprotocommand("lookup", remotelookup)
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extensions.wrapfunction(localrepo.localrepository, "lookup", locallookup)
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_exchangesetup()
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_bundlesetup()
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