hgext/lfs/__init__.py
author Matt Harbison <matt_harbison@yahoo.com>
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parent 41048 84d61fdcefa5
child 41070 8f40e21ca842
permissions -rw-r--r--
exthelper: reintroduce the ability to register templates Same mechanism as revsets earlier in this series. The LFS extension is updated to provide test coverage. This also seems to make the test failure around issue6033 mentioned in 0a7f582f6f1f much less regular on Windows.
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# lfs - hash-preserving large file support using Git-LFS protocol
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#
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# Copyright 2017 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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"""lfs - large file support (EXPERIMENTAL)
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This extension allows large files to be tracked outside of the normal
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repository storage and stored on a centralized server, similar to the
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``largefiles`` extension.  The ``git-lfs`` protocol is used when
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communicating with the server, so existing git infrastructure can be
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harnessed.  Even though the files are stored outside of the repository,
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they are still integrity checked in the same manner as normal files.
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The files stored outside of the repository are downloaded on demand,
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which reduces the time to clone, and possibly the local disk usage.
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This changes fundamental workflows in a DVCS, so careful thought
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should be given before deploying it.  :hg:`convert` can be used to
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convert LFS repositories to normal repositories that no longer
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require this extension, and do so without changing the commit hashes.
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This allows the extension to be disabled if the centralized workflow
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becomes burdensome.  However, the pre and post convert clones will
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not be able to communicate with each other unless the extension is
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enabled on both.
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To start a new repository, or to add LFS files to an existing one, just
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create an ``.hglfs`` file as described below in the root directory of
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the repository.  Typically, this file should be put under version
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control, so that the settings will propagate to other repositories with
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push and pull.  During any commit, Mercurial will consult this file to
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determine if an added or modified file should be stored externally.  The
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type of storage depends on the characteristics of the file at each
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commit.  A file that is near a size threshold may switch back and forth
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between LFS and normal storage, as needed.
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Alternately, both normal repositories and largefile controlled
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repositories can be converted to LFS by using :hg:`convert` and the
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``lfs.track`` config option described below.  The ``.hglfs`` file
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should then be created and added, to control subsequent LFS selection.
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The hashes are also unchanged in this case.  The LFS and non-LFS
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repositories can be distinguished because the LFS repository will
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abort any command if this extension is disabled.
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Committed LFS files are held locally, until the repository is pushed.
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Prior to pushing the normal repository data, the LFS files that are
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tracked by the outgoing commits are automatically uploaded to the
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configured central server.  No LFS files are transferred on
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:hg:`pull` or :hg:`clone`.  Instead, the files are downloaded on
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demand as they need to be read, if a cached copy cannot be found
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locally.  Both committing and downloading an LFS file will link the
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file to a usercache, to speed up future access.  See the `usercache`
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config setting described below.
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.hglfs::
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    The extension reads its configuration from a versioned ``.hglfs``
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    configuration file found in the root of the working directory. The
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    ``.hglfs`` file uses the same syntax as all other Mercurial
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    configuration files. It uses a single section, ``[track]``.
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    The ``[track]`` section specifies which files are stored as LFS (or
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    not). Each line is keyed by a file pattern, with a predicate value.
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    The first file pattern match is used, so put more specific patterns
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    first.  The available predicates are ``all()``, ``none()``, and
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    ``size()``. See "hg help filesets.size" for the latter.
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    Example versioned ``.hglfs`` file::
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      [track]
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      # No Makefile or python file, anywhere, will be LFS
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      **Makefile = none()
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      **.py = none()
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      **.zip = all()
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      **.exe = size(">1MB")
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      # Catchall for everything not matched above
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      ** = size(">10MB")
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Configs::
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    [lfs]
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    # Remote endpoint. Multiple protocols are supported:
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    # - http(s)://user:pass@example.com/path
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    #   git-lfs endpoint
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    # - file:///tmp/path
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    #   local filesystem, usually for testing
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    # if unset, lfs will assume the remote repository also handles blob storage
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    # for http(s) URLs.  Otherwise, lfs will prompt to set this when it must
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    # use this value.
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    # (default: unset)
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    url = https://example.com/repo.git/info/lfs
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    # Which files to track in LFS.  Path tests are "**.extname" for file
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    # extensions, and "path:under/some/directory" for path prefix.  Both
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    # are relative to the repository root.
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    # File size can be tested with the "size()" fileset, and tests can be
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    # joined with fileset operators.  (See "hg help filesets.operators".)
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    #
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    # Some examples:
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    # - all()                       # everything
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    # - none()                      # nothing
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    # - size(">20MB")               # larger than 20MB
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    # - !**.txt                     # anything not a *.txt file
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    # - **.zip | **.tar.gz | **.7z  # some types of compressed files
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    # - path:bin                    # files under "bin" in the project root
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    # - (**.php & size(">2MB")) | (**.js & size(">5MB")) | **.tar.gz
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    #     | (path:bin & !path:/bin/README) | size(">1GB")
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    # (default: none())
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    #
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    # This is ignored if there is a tracked '.hglfs' file, and this setting
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    # will eventually be deprecated and removed.
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    track = size(">10M")
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    # how many times to retry before giving up on transferring an object
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    retry = 5
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    # the local directory to store lfs files for sharing across local clones.
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    # If not set, the cache is located in an OS specific cache location.
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    usercache = /path/to/global/cache
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"""
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from __future__ import absolute_import
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import sys
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from mercurial.i18n import _
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from mercurial import (
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    config,
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    error,
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    exchange,
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    extensions,
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    exthelper,
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    filelog,
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    filesetlang,
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    localrepo,
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    minifileset,
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    node,
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    pycompat,
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    registrar,
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    repository,
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    revlog,
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    scmutil,
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    templateutil,
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    util,
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)
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from . import (
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    blobstore,
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    wireprotolfsserver,
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    wrapper,
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)
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# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
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# extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
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# be specifying the version(s) of Mercurial they are tested with, or
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# leave the attribute unspecified.
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testedwith = 'ships-with-hg-core'
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eh = exthelper.exthelper()
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eh.merge(wrapper.eh)
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eh.merge(wireprotolfsserver.eh)
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cmdtable = eh.cmdtable
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configtable = eh.configtable
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extsetup = eh.finalextsetup
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uisetup = eh.finaluisetup
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reposetup = eh.finalreposetup
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templatekeyword = eh.templatekeyword
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eh.configitem('experimental', 'lfs.serve',
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    default=True,
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)
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eh.configitem('experimental', 'lfs.user-agent',
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    default=None,
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)
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eh.configitem('experimental', 'lfs.disableusercache',
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    default=False,
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)
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eh.configitem('experimental', 'lfs.worker-enable',
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    default=False,
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)
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eh.configitem('lfs', 'url',
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    default=None,
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)
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eh.configitem('lfs', 'usercache',
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    default=None,
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)
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# Deprecated
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eh.configitem('lfs', 'threshold',
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    default=None,
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)
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eh.configitem('lfs', 'track',
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    default='none()',
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)
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eh.configitem('lfs', 'retry',
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    default=5,
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)
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filesetpredicate = registrar.filesetpredicate()
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lfsprocessor = (
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    wrapper.readfromstore,
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    wrapper.writetostore,
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    wrapper.bypasscheckhash,
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)
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def featuresetup(ui, supported):
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    # don't die on seeing a repo with the lfs requirement
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    supported |= {'lfs'}
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@eh.uisetup
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def _uisetup(ui):
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    localrepo.featuresetupfuncs.add(featuresetup)
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@eh.reposetup
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def _reposetup(ui, repo):
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    # Nothing to do with a remote repo
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    if not repo.local():
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        return
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    repo.svfs.lfslocalblobstore = blobstore.local(repo)
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    repo.svfs.lfsremoteblobstore = blobstore.remote(repo)
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    class lfsrepo(repo.__class__):
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        @localrepo.unfilteredmethod
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        def commitctx(self, ctx, error=False):
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            repo.svfs.options['lfstrack'] = _trackedmatcher(self)
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            return super(lfsrepo, self).commitctx(ctx, error)
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    repo.__class__ = lfsrepo
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    if 'lfs' not in repo.requirements:
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        def checkrequireslfs(ui, repo, **kwargs):
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            if 'lfs' in repo.requirements:
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                return 0
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            last = kwargs.get(r'node_last')
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            _bin = node.bin
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            if last:
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                s = repo.set('%n:%n', _bin(kwargs[r'node']), _bin(last))
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            else:
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                s = repo.set('%n', _bin(kwargs[r'node']))
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            match = repo.narrowmatch()
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            for ctx in s:
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                # TODO: is there a way to just walk the files in the commit?
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                if any(ctx[f].islfs() for f in ctx.files()
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                       if f in ctx and match(f)):
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                    repo.requirements.add('lfs')
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   253
                    repo.features.add(repository.REPO_FEATURE_LFS)
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                    repo._writerequirements()
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                    repo.prepushoutgoinghooks.add('lfs', wrapper.prepush)
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                    break
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        ui.setconfig('hooks', 'commit.lfs', checkrequireslfs, 'lfs')
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        ui.setconfig('hooks', 'pretxnchangegroup.lfs', checkrequireslfs, 'lfs')
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    else:
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        repo.prepushoutgoinghooks.add('lfs', wrapper.prepush)
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def _trackedmatcher(repo):
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    """Return a function (path, size) -> bool indicating whether or not to
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   265
    track a given file with lfs."""
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   266
    if not repo.wvfs.exists('.hglfs'):
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        # No '.hglfs' in wdir.  Fallback to config for now.
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        trackspec = repo.ui.config('lfs', 'track')
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   269
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        # deprecated config: lfs.threshold
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        threshold = repo.ui.configbytes('lfs', 'threshold')
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        if threshold:
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            filesetlang.parse(trackspec)  # make sure syntax errors are confined
35807
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            trackspec = "(%s) | size('>%d')" % (trackspec, threshold)
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        return minifileset.compile(trackspec)
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    data = repo.wvfs.tryread('.hglfs')
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   279
    if not data:
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   280
        return lambda p, s: False
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   281
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    # Parse errors here will abort with a message that points to the .hglfs file
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   283
    # and line number.
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   284
    cfg = config.config()
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   285
    cfg.parse('.hglfs', data)
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   286
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   287
    try:
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   288
        rules = [(minifileset.compile(pattern), minifileset.compile(rule))
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   289
                 for pattern, rule in cfg.items('track')]
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   290
    except error.ParseError as e:
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   291
        # The original exception gives no indicator that the error is in the
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   292
        # .hglfs file, so add that.
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   293
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   294
        # TODO: See if the line number of the file can be made available.
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   295
        raise error.Abort(_('parse error in .hglfs: %s') % e)
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   296
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   297
    def _match(path, size):
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   298
        for pat, rule in rules:
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   299
            if pat(path, size):
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   300
                return rule(path, size)
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   301
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   302
        return False
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   303
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   304
    return _match
35664
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   305
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   306
# Called by remotefilelog
35098
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   307
def wrapfilelog(filelog):
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diff changeset
   308
    wrapfunction = extensions.wrapfunction
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   309
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   310
    wrapfunction(filelog, 'addrevision', wrapper.filelogaddrevision)
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   311
    wrapfunction(filelog, 'renamed', wrapper.filelogrenamed)
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   312
    wrapfunction(filelog, 'size', wrapper.filelogsize)
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parents:
diff changeset
   313
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   314
@eh.wrapfunction(localrepo, 'resolverevlogstorevfsoptions')
40268
9c4cbbb0fc51 lfs: register the flag processors per repository
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   315
def _resolverevlogstorevfsoptions(orig, ui, requirements, features):
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diff changeset
   316
    opts = orig(ui, requirements, features)
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diff changeset
   317
    for name, module in extensions.extensions(ui):
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diff changeset
   318
        if module is sys.modules[__name__]:
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diff changeset
   319
            if revlog.REVIDX_EXTSTORED in opts[b'flagprocessors']:
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   320
                msg = (_(b"cannot register multiple processors on flag '%#x'.")
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diff changeset
   321
                       % revlog.REVIDX_EXTSTORED)
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diff changeset
   322
                raise error.Abort(msg)
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diff changeset
   323
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diff changeset
   324
            opts[b'flagprocessors'][revlog.REVIDX_EXTSTORED] = lfsprocessor
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diff changeset
   325
            break
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diff changeset
   326
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diff changeset
   327
    return opts
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diff changeset
   328
41048
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diff changeset
   329
@eh.extsetup
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diff changeset
   330
def _extsetup(ui):
35098
66c5a8cf2868 lfs: import the Facebook git-lfs client extension
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parents:
diff changeset
   331
    wrapfilelog(filelog.filelog)
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parents:
diff changeset
   332
36138
a991fcc48222 lfs: migrate to the fileprefetch callback mechanism
Matt Harbison <matt_harbison@yahoo.com>
parents: 36000
diff changeset
   333
    scmutil.fileprefetchhooks.add('lfs', wrapper._prefetchfiles)
35922
0b79f99fd7b0 lfs: prefetch lfs blobs when applying merge updates
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diff changeset
   334
35098
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parents:
diff changeset
   335
    # Make bundle choose changegroup3 instead of changegroup2. This affects
66c5a8cf2868 lfs: import the Facebook git-lfs client extension
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parents:
diff changeset
   336
    # "hg bundle" command. Note: it does not cover all bundle formats like
66c5a8cf2868 lfs: import the Facebook git-lfs client extension
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parents:
diff changeset
   337
    # "packed1". Using "packed1" with lfs will likely cause trouble.
37165
6c7a6b04b274 bundlespec: move computing the bundle contentops in parsebundlespec
Boris Feld <boris.feld@octobus.net>
parents: 37147
diff changeset
   338
    exchange._bundlespeccontentopts["v2"]["cg.version"] = "03"
35098
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parents:
diff changeset
   339
38800
7790cd70842a lfs: remove callstatus property from 'lfs()' fileset
Yuya Nishihara <yuya@tcha.org>
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diff changeset
   340
@filesetpredicate('lfs()')
35990
eefb5d603482 lfs: add a fileset for detecting lfs files
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diff changeset
   341
def lfsfileset(mctx, x):
eefb5d603482 lfs: add a fileset for detecting lfs files
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diff changeset
   342
    """File that uses LFS storage."""
eefb5d603482 lfs: add a fileset for detecting lfs files
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diff changeset
   343
    # i18n: "lfs" is a keyword
38805
b9162ea1b815 fileset: extract language processing part to new module (API)
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parents: 38800
diff changeset
   344
    filesetlang.getargs(x, 0, 0, _("lfs takes no arguments"))
38689
ff5b6fca1082 fileset: rewrite predicates to return matcher not closed to subset (API) (BC)
Yuya Nishihara <yuya@tcha.org>
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diff changeset
   345
    ctx = mctx.ctx
ff5b6fca1082 fileset: rewrite predicates to return matcher not closed to subset (API) (BC)
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diff changeset
   346
    def lfsfilep(f):
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diff changeset
   347
        return wrapper.pointerfromctx(ctx, f, removed=True) is not None
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diff changeset
   348
    return mctx.predicate(lfsfilep, predrepr='<lfs>')
35990
eefb5d603482 lfs: add a fileset for detecting lfs files
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diff changeset
   349
41069
70ca0e846d25 exthelper: reintroduce the ability to register templates
Matt Harbison <matt_harbison@yahoo.com>
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diff changeset
   350
@eh.templatekeyword('lfs_files', requires={'ctx'})
36598
c3f9d0c303e8 templatekw: switch remainder of _showlist template keywords to new API
Yuya Nishihara <yuya@tcha.org>
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diff changeset
   351
def lfsfiles(context, mapping):
35999
8c7d5e90e6bd lfs: teach '{lfs_files}' to handle removed files
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diff changeset
   352
    """List of strings. All files modified, added, or removed by this
8c7d5e90e6bd lfs: teach '{lfs_files}' to handle removed files
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diff changeset
   353
    changeset."""
36598
c3f9d0c303e8 templatekw: switch remainder of _showlist template keywords to new API
Yuya Nishihara <yuya@tcha.org>
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diff changeset
   354
    ctx = context.resource(mapping, 'ctx')
35657
8580e5898cb7 lfs: convert '{lfs_files}' keyword to a hybrid list
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diff changeset
   355
35999
8c7d5e90e6bd lfs: teach '{lfs_files}' to handle removed files
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diff changeset
   356
    pointers = wrapper.pointersfromctx(ctx, removed=True) # {path: pointer}
35657
8580e5898cb7 lfs: convert '{lfs_files}' keyword to a hybrid list
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diff changeset
   357
    files = sorted(pointers.keys())
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diff changeset
   358
35769
f00edef84c3b lfs: rename {lfsattrs} to {pointer}
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diff changeset
   359
    def pointer(v):
35731
f58245b9e3ea lfs: add the '{lfsattrs}' template keyword to '{lfs_files}'
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parents: 35665
diff changeset
   360
        # In the file spec, version is first and the other keys are sorted.
f58245b9e3ea lfs: add the '{lfsattrs}' template keyword to '{lfs_files}'
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parents: 35665
diff changeset
   361
        sortkeyfunc = lambda x: (x[0] != 'version', x)
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parents: 35665
diff changeset
   362
        items = sorted(pointers[v].iteritems(), key=sortkeyfunc)
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        return util.sortdict(items)
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    makemap = lambda v: {
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        'file': v,
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        'lfsoid': pointers[v].oid() if pointers[v] else None,
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        'lfspointer': templateutil.hybriddict(pointer(v)),
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    }
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    # TODO: make the separator ', '?
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    f = templateutil._showcompatlist(context, mapping, 'lfs_file', files)
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    return templateutil.hybrid(f, files, makemap, pycompat.identity)
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@eh.command('debuglfsupload',
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            [('r', 'rev', [], _('upload large files introduced by REV'))])
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def debuglfsupload(ui, repo, **opts):
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    """upload lfs blobs added by the working copy parent or given revisions"""
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    revs = opts.get(r'rev', [])
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    pointers = wrapper.extractpointers(repo, scmutil.revrange(repo, revs))
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    wrapper.uploadblobs(repo, pointers)