hgext/remotefilelog/remotefilelogserver.py
author Martin von Zweigbergk <martinvonz@google.com>
Sat, 09 Feb 2019 22:50:53 -0800
changeset 41676 0531dff73d0b
parent 40842 fbd053af2eda
child 42771 fdeb4c1d23d5
permissions -rw-r--r--
match: delete unused root and cwd arguments from {always,never,exact}() (API) Differential Revision: https://phab.mercurial-scm.org/D5930
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# remotefilelogserver.py - server logic for a remotefilelog server
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#
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# Copyright 2013 Facebook, Inc.
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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 or any later version.
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from __future__ import absolute_import
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import errno
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import os
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import stat
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import time
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import zlib
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from mercurial.i18n import _
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from mercurial.node import bin, hex, nullid
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from mercurial import (
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    changegroup,
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    changelog,
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    context,
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    error,
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    extensions,
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    match,
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    store,
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    streamclone,
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    util,
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    wireprotoserver,
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    wireprototypes,
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    wireprotov1server,
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)
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from .  import (
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    constants,
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    shallowutil,
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)
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_sshv1server = wireprotoserver.sshv1protocolhandler
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def setupserver(ui, repo):
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    """Sets up a normal Mercurial repo so it can serve files to shallow repos.
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    """
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    onetimesetup(ui)
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    # don't send files to shallow clients during pulls
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    def generatefiles(orig, self, changedfiles, linknodes, commonrevs, source,
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                      *args, **kwargs):
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        caps = self._bundlecaps or []
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        if constants.BUNDLE2_CAPABLITY in caps:
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            # only send files that don't match the specified patterns
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            includepattern = None
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            excludepattern = None
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            for cap in (self._bundlecaps or []):
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                if cap.startswith("includepattern="):
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                    includepattern = cap[len("includepattern="):].split('\0')
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                elif cap.startswith("excludepattern="):
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                    excludepattern = cap[len("excludepattern="):].split('\0')
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            m = match.always()
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            if includepattern or excludepattern:
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                m = match.match(repo.root, '', None,
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                    includepattern, excludepattern)
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            changedfiles = list([f for f in changedfiles if not m(f)])
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        return orig(self, changedfiles, linknodes, commonrevs, source,
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                    *args, **kwargs)
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    extensions.wrapfunction(
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        changegroup.cgpacker, 'generatefiles', generatefiles)
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onetime = False
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def onetimesetup(ui):
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    """Configures the wireprotocol for both clients and servers.
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    """
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    global onetime
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    if onetime:
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        return
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    onetime = True
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    # support file content requests
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    wireprotov1server.wireprotocommand(
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        'x_rfl_getflogheads', 'path', permission='pull')(getflogheads)
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    wireprotov1server.wireprotocommand(
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        'x_rfl_getfiles', '', permission='pull')(getfiles)
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    wireprotov1server.wireprotocommand(
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        'x_rfl_getfile', 'file node', permission='pull')(getfile)
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    class streamstate(object):
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        match = None
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        shallowremote = False
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        noflatmf = False
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    state = streamstate()
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    def stream_out_shallow(repo, proto, other):
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        includepattern = None
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        excludepattern = None
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        raw = other.get('includepattern')
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        if raw:
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            includepattern = raw.split('\0')
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        raw = other.get('excludepattern')
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        if raw:
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            excludepattern = raw.split('\0')
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        oldshallow = state.shallowremote
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        oldmatch = state.match
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        oldnoflatmf = state.noflatmf
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        try:
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            state.shallowremote = True
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            state.match = match.always()
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            state.noflatmf = other.get('noflatmanifest') == 'True'
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            if includepattern or excludepattern:
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                state.match = match.match(repo.root, '', None,
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                    includepattern, excludepattern)
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            streamres = wireprotov1server.stream(repo, proto)
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            # Force the first value to execute, so the file list is computed
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            # within the try/finally scope
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            first = next(streamres.gen)
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            second = next(streamres.gen)
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            def gen():
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                yield first
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                yield second
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                for value in streamres.gen:
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                    yield value
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            return wireprototypes.streamres(gen())
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        finally:
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            state.shallowremote = oldshallow
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            state.match = oldmatch
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            state.noflatmf = oldnoflatmf
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    wireprotov1server.commands['stream_out_shallow'] = (stream_out_shallow, '*')
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    # don't clone filelogs to shallow clients
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    def _walkstreamfiles(orig, repo, matcher=None):
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        if state.shallowremote:
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            # if we are shallow ourselves, stream our local commits
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            if shallowutil.isenabled(repo):
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                striplen = len(repo.store.path) + 1
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                readdir = repo.store.rawvfs.readdir
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                visit = [os.path.join(repo.store.path, 'data')]
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                while visit:
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                    p = visit.pop()
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                    for f, kind, st in readdir(p, stat=True):
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                        fp = p + '/' + f
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                        if kind == stat.S_IFREG:
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                            if not fp.endswith('.i') and not fp.endswith('.d'):
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                                n = util.pconvert(fp[striplen:])
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                                yield (store.decodedir(n), n, st.st_size)
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                        if kind == stat.S_IFDIR:
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                            visit.append(fp)
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            if 'treemanifest' in repo.requirements:
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                for (u, e, s) in repo.store.datafiles():
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                    if (u.startswith('meta/') and
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                        (u.endswith('.i') or u.endswith('.d'))):
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                        yield (u, e, s)
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            # Return .d and .i files that do not match the shallow pattern
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            match = state.match
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            if match and not match.always():
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                for (u, e, s) in repo.store.datafiles():
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                    f = u[5:-2]  # trim data/...  and .i/.d
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                    if not state.match(f):
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                        yield (u, e, s)
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            for x in repo.store.topfiles():
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                if state.noflatmf and x[0][:11] == '00manifest.':
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                    continue
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                yield x
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   168
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        elif shallowutil.isenabled(repo):
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            # don't allow cloning from a shallow repo to a full repo
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            # since it would require fetching every version of every
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            # file in order to create the revlogs.
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            raise error.Abort(_("Cannot clone from a shallow repo "
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                                "to a full repo."))
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        else:
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            for x in orig(repo, matcher):
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                yield x
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    extensions.wrapfunction(streamclone, '_walkstreamfiles', _walkstreamfiles)
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    # expose remotefilelog capabilities
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    def _capabilities(orig, repo, proto):
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        caps = orig(repo, proto)
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   184
        if (shallowutil.isenabled(repo) or ui.configbool('remotefilelog',
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                                                         'server')):
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   186
            if isinstance(proto, _sshv1server):
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                # legacy getfiles method which only works over ssh
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                caps.append(constants.NETWORK_CAP_LEGACY_SSH_GETFILES)
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            caps.append('x_rfl_getflogheads')
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            caps.append('x_rfl_getfile')
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        return caps
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    extensions.wrapfunction(wireprotov1server, '_capabilities', _capabilities)
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   193
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   194
    def _adjustlinkrev(orig, self, *args, **kwargs):
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   195
        # When generating file blobs, taking the real path is too slow on large
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   196
        # repos, so force it to just return the linkrev directly.
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        repo = self._repo
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   198
        if util.safehasattr(repo, 'forcelinkrev') and repo.forcelinkrev:
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   199
            return self._filelog.linkrev(self._filelog.rev(self._filenode))
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   200
        return orig(self, *args, **kwargs)
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   201
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   202
    extensions.wrapfunction(
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   203
        context.basefilectx, '_adjustlinkrev', _adjustlinkrev)
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    def _iscmd(orig, cmd):
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   206
        if cmd == 'x_rfl_getfiles':
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            return False
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   208
        return orig(cmd)
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    extensions.wrapfunction(wireprotoserver, 'iscmd', _iscmd)
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   211
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   212
def _loadfileblob(repo, cachepath, path, node):
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    filecachepath = os.path.join(cachepath, path, hex(node))
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   214
    if not os.path.exists(filecachepath) or os.path.getsize(filecachepath) == 0:
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        filectx = repo.filectx(path, fileid=node)
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   216
        if filectx.node() == nullid:
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            repo.changelog = changelog.changelog(repo.svfs)
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            filectx = repo.filectx(path, fileid=node)
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   219
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        text = createfileblob(filectx)
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   221
        # TODO configurable compression engines
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   222
        text = zlib.compress(text)
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   224
        # everything should be user & group read/writable
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        oldumask = os.umask(0o002)
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   226
        try:
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   227
            dirname = os.path.dirname(filecachepath)
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   228
            if not os.path.exists(dirname):
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                try:
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                    os.makedirs(dirname)
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                except OSError as ex:
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                    if ex.errno != errno.EEXIST:
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                        raise
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            f = None
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            try:
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                f = util.atomictempfile(filecachepath, "wb")
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                f.write(text)
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            except (IOError, OSError):
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                # Don't abort if the user only has permission to read,
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                # and not write.
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                pass
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            finally:
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                if f:
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                    f.close()
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        finally:
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            os.umask(oldumask)
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    else:
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        with open(filecachepath, "rb") as f:
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            text = f.read()
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    return text
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def getflogheads(repo, proto, path):
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    """A server api for requesting a filelog's heads
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    """
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    flog = repo.file(path)
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    heads = flog.heads()
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    return '\n'.join((hex(head) for head in heads if head != nullid))
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def getfile(repo, proto, file, node):
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    """A server api for requesting a particular version of a file. Can be used
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    in batches to request many files at once. The return protocol is:
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    <errorcode>\0<data/errormsg> where <errorcode> is 0 for success or
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    non-zero for an error.
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    data is a compressed blob with revlog flag and ancestors information. See
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    createfileblob for its content.
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    """
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    if shallowutil.isenabled(repo):
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        return '1\0' + _('cannot fetch remote files from shallow repo')
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    cachepath = repo.ui.config("remotefilelog", "servercachepath")
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    if not cachepath:
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        cachepath = os.path.join(repo.path, "remotefilelogcache")
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    node = bin(node.strip())
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    if node == nullid:
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        return '0\0'
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    return '0\0' + _loadfileblob(repo, cachepath, file, node)
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def getfiles(repo, proto):
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    """A server api for requesting particular versions of particular files.
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    """
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    if shallowutil.isenabled(repo):
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        raise error.Abort(_('cannot fetch remote files from shallow repo'))
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    if not isinstance(proto, _sshv1server):
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        raise error.Abort(_('cannot fetch remote files over non-ssh protocol'))
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    def streamer():
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        fin = proto._fin
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        cachepath = repo.ui.config("remotefilelog", "servercachepath")
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        if not cachepath:
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            cachepath = os.path.join(repo.path, "remotefilelogcache")
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   294
        while True:
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   295
            request = fin.readline()[:-1]
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   296
            if not request:
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                break
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            node = bin(request[:40])
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   300
            if node == nullid:
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                yield '0\n'
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                continue
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   303
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   304
            path = request[40:]
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   305
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   306
            text = _loadfileblob(repo, cachepath, path, node)
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   307
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   308
            yield '%d\n%s' % (len(text), text)
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   309
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            # it would be better to only flush after processing a whole batch
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            # but currently we don't know if there are more requests coming
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            proto._fout.flush()
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   313
    return wireprototypes.streamres(streamer())
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   314
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   315
def createfileblob(filectx):
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   316
    """
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   317
    format:
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   318
        v0:
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   319
            str(len(rawtext)) + '\0' + rawtext + ancestortext
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   320
        v1:
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diff changeset
   321
            'v1' + '\n' + metalist + '\0' + rawtext + ancestortext
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   322
            metalist := metalist + '\n' + meta | meta
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diff changeset
   323
            meta := sizemeta | flagmeta
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diff changeset
   324
            sizemeta := METAKEYSIZE + str(len(rawtext))
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diff changeset
   325
            flagmeta := METAKEYFLAG + str(flag)
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diff changeset
   326
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   327
            note: sizemeta must exist. METAKEYFLAG and METAKEYSIZE must have a
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   328
            length of 1.
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diff changeset
   329
    """
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diff changeset
   330
    flog = filectx.filelog()
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diff changeset
   331
    frev = filectx.filerev()
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diff changeset
   332
    revlogflags = flog._revlog.flags(frev)
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diff changeset
   333
    if revlogflags == 0:
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diff changeset
   334
        # normal files
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diff changeset
   335
        text = filectx.data()
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diff changeset
   336
    else:
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diff changeset
   337
        # lfs, read raw revision data
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diff changeset
   338
        text = flog.revision(frev, raw=True)
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   339
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   340
    repo = filectx._repo
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diff changeset
   341
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   342
    ancestors = [filectx]
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diff changeset
   343
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   344
    try:
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   345
        repo.forcelinkrev = True
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diff changeset
   346
        ancestors.extend([f for f in filectx.ancestors()])
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diff changeset
   347
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   348
        ancestortext = ""
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   349
        for ancestorctx in ancestors:
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   350
            parents = ancestorctx.parents()
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   351
            p1 = nullid
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   352
            p2 = nullid
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   353
            if len(parents) > 0:
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   354
                p1 = parents[0].filenode()
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   355
            if len(parents) > 1:
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   356
                p2 = parents[1].filenode()
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   357
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   358
            copyname = ""
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   359
            rename = ancestorctx.renamed()
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   360
            if rename:
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   361
                copyname = rename[0]
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   362
            linknode = ancestorctx.node()
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   363
            ancestortext += "%s%s%s%s%s\0" % (
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   364
                ancestorctx.filenode(), p1, p2, linknode,
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   365
                copyname)
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   366
    finally:
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   367
        repo.forcelinkrev = False
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   368
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   369
    header = shallowutil.buildfileblobheader(len(text), revlogflags)
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   370
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   371
    return "%s\0%s%s" % (header, text, ancestortext)
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   372
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   373
def gcserver(ui, repo):
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   374
    if not repo.ui.configbool("remotefilelog", "server"):
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   375
        return
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   376
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   377
    neededfiles = set()
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   378
    heads = repo.revs("heads(tip~25000:) - null")
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   379
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   380
    cachepath = repo.vfs.join("remotefilelogcache")
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   381
    for head in heads:
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   382
        mf = repo[head].manifest()
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   383
        for filename, filenode in mf.iteritems():
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   384
            filecachepath = os.path.join(cachepath, filename, hex(filenode))
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   385
            neededfiles.add(filecachepath)
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   386
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   387
    # delete unneeded older files
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   388
    days = repo.ui.configint("remotefilelog", "serverexpiration")
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   389
    expiration = time.time() - (days * 24 * 60 * 60)
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   390
40842
fbd053af2eda remotefilelog: use progress helper in remotefilelogserver
Martin von Zweigbergk <martinvonz@google.com>
parents: 40614
diff changeset
   391
    progress = ui.makeprogress(_("removing old server cache"), unit="files")
fbd053af2eda remotefilelog: use progress helper in remotefilelogserver
Martin von Zweigbergk <martinvonz@google.com>
parents: 40614
diff changeset
   392
    progress.update(0)
40495
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   393
    for root, dirs, files in os.walk(cachepath):
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   394
        for file in files:
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   395
            filepath = os.path.join(root, file)
40842
fbd053af2eda remotefilelog: use progress helper in remotefilelogserver
Martin von Zweigbergk <martinvonz@google.com>
parents: 40614
diff changeset
   396
            progress.increment()
40495
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   397
            if filepath in neededfiles:
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   398
                continue
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   399
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   400
            stat = os.stat(filepath)
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   401
            if stat.st_mtime < expiration:
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   402
                os.remove(filepath)
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   403
40842
fbd053af2eda remotefilelog: use progress helper in remotefilelogserver
Martin von Zweigbergk <martinvonz@google.com>
parents: 40614
diff changeset
   404
    progress.complete()