annotate hgext/lfs/__init__.py @ 35663:a985834961f7

lfs: allow the pointer file to be viewed with `hg cat -T '{rawdata}'`

The only other interface to this data is `hg debugdata`, which requires
knowledge of the filelog revision that corresponds to the changeset.  Since the
data is uninterpreted, this is an important debugging capability, and needs to
be simpler to use than that.

For non-LFS files, this displays the regular data.

Alternately, we could forego the messy function extraction in the last patch if
this template keyword can just be added unconditionally.

# lfs - hash-preserving large file support using Git-LFS protocol
#
# Copyright 2017 Facebook, Inc.
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

"""lfs - large file support (EXPERIMENTAL)

Configs::

    [lfs]
    # Remote endpoint. Multiple protocols are supported:
    # - http(s)://user:[e-mail]/path
    #   git-lfs endpoint
    # - file:///tmp/path
    #   local filesystem, usually for testing
    # if unset, lfs will prompt setting this when it must use this value.
    # (default: unset)
    url = https://example.com/lfs

    # Which files to track in LFS.  Path tests are "**.extname" for file
    # extensions, and "path:under/some/directory" for path prefix.  Both
    # are relative to the repository root, and the latter must be quoted.
    # File size can be tested with the "size()" fileset, and tests can be
    # joined with fileset operators.  (See "hg help filesets.operators".)
    #
    # Some examples:
    # - all()                       # everything
    # - none()                      # nothing
    # - size(">20MB")               # larger than 20MB
    # - !**.txt                     # anything not a *.txt file
    # - **.zip | **.tar.gz | **.7z  # some types of compressed files
    # - "path:bin"                  # files under "bin" in the project root
    # - (**.php & size(">2MB")) | (**.js & size(">5MB")) | **.tar.gz
    #     | ("path:bin" & !"path:/bin/README") | size(">1GB")
    # (default: none())
    track = size(">10M")

    # how many times to retry before giving up on transferring an object
    retry = 5

    # the local directory to store lfs files for sharing across local clones.
    # If not set, the cache is located in an OS specific cache location.
    usercache = /path/to/global/cache
"""

from __future__ import absolute_import

from mercurial.i18n import _

from mercurial import (
    bundle2,
    changegroup,
    cmdutil,
    context,
    exchange,
    extensions,
    filelog,
    fileset,
    hg,
    localrepo,
    minifileset,
    node,
    pycompat,
    registrar,
    revlog,
    scmutil,
    templatekw,
    upgrade,
    vfs as vfsmod,
    wireproto,
)

from . import (
    blobstore,
    wrapper,
)

# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
# extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
# be specifying the version(s) of Mercurial they are tested with, or
# leave the attribute unspecified.
testedwith = 'ships-with-hg-core'

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

configitem('experimental', 'lfs.user-agent',
    default=None,
)

configitem('lfs', 'url',
    default=None,
)
configitem('lfs', 'usercache',
    default=None,
)
# Deprecated
configitem('lfs', 'threshold',
    default=None,
)
configitem('lfs', 'track',
    default='none()',
)
configitem('lfs', 'retry',
    default=5,
)

cmdtable = {}
command = registrar.command(cmdtable)

templatekeyword = registrar.templatekeyword()

def featuresetup(ui, supported):
    # don't die on seeing a repo with the lfs requirement
    supported |= {'lfs'}

def uisetup(ui):
    localrepo.localrepository.featuresetupfuncs.add(featuresetup)

def reposetup(ui, repo):
    # Nothing to do with a remote repo
    if not repo.local():
        return

    trackspec = repo.ui.config('lfs', 'track')

    # deprecated config: lfs.threshold
    threshold = repo.ui.configbytes('lfs', 'threshold')
    if threshold:
        fileset.parse(trackspec)  # make sure syntax errors are confined
        trackspec = "(%s) | size('>%d')" % (trackspec, threshold)

    repo.svfs.options['lfstrack'] = minifileset.compile(trackspec)
    repo.svfs.lfslocalblobstore = blobstore.local(repo)
    repo.svfs.lfsremoteblobstore = blobstore.remote(repo)

    # Push hook
    repo.prepushoutgoinghooks.add('lfs', wrapper.prepush)

    if 'lfs' not in repo.requirements:
        def checkrequireslfs(ui, repo, **kwargs):
            if 'lfs' not in repo.requirements:
                last = kwargs.get('node_last')
                _bin = node.bin
                if last:
                    s = repo.set('%n:%n', _bin(kwargs['node']), _bin(last))
                else:
                    s = repo.set('%n', _bin(kwargs['node']))
            for ctx in s:
                # TODO: is there a way to just walk the files in the commit?
                if any(ctx[f].islfs() for f in ctx.files() if f in ctx):
                    repo.requirements.add('lfs')
                    repo._writerequirements()
                    break

        ui.setconfig('hooks', 'commit.lfs', checkrequireslfs, 'lfs')
        ui.setconfig('hooks', 'pretxnchangegroup.lfs', checkrequireslfs, 'lfs')

def wrapfilelog(filelog):
    wrapfunction = extensions.wrapfunction

    wrapfunction(filelog, 'addrevision', wrapper.filelogaddrevision)
    wrapfunction(filelog, 'renamed', wrapper.filelogrenamed)
    wrapfunction(filelog, 'size', wrapper.filelogsize)

def extsetup(ui):
    wrapfilelog(filelog.filelog)

    wrapfunction = extensions.wrapfunction

    wrapfunction(cmdutil, '_updatecatformatter', wrapper._updatecatformatter)
    wrapfunction(scmutil, 'wrapconvertsink', wrapper.convertsink)

    wrapfunction(upgrade, '_finishdatamigration',
                 wrapper.upgradefinishdatamigration)

    wrapfunction(upgrade, 'preservedrequirements',
                 wrapper.upgraderequirements)

    wrapfunction(upgrade, 'supporteddestrequirements',
                 wrapper.upgraderequirements)

    wrapfunction(changegroup,
                 'supportedoutgoingversions',
                 wrapper.supportedoutgoingversions)
    wrapfunction(changegroup,
                 'allsupportedversions',
                 wrapper.allsupportedversions)

    wrapfunction(exchange, 'push', wrapper.push)
    wrapfunction(wireproto, '_capabilities', wrapper._capabilities)

    wrapfunction(context.basefilectx, 'cmp', wrapper.filectxcmp)
    wrapfunction(context.basefilectx, 'isbinary', wrapper.filectxisbinary)
    context.basefilectx.islfs = wrapper.filectxislfs

    revlog.addflagprocessor(
        revlog.REVIDX_EXTSTORED,
        (
            wrapper.readfromstore,
            wrapper.writetostore,
            wrapper.bypasscheckhash,
        ),
    )

    wrapfunction(hg, 'clone', wrapper.hgclone)
    wrapfunction(hg, 'postshare', wrapper.hgpostshare)

    # Make bundle choose changegroup3 instead of changegroup2. This affects
    # "hg bundle" command. Note: it does not cover all bundle formats like
    # "packed1". Using "packed1" with lfs will likely cause trouble.
    names = [k for k, v in exchange._bundlespeccgversions.items() if v == '02']
    for k in names:
        exchange._bundlespeccgversions[k] = '03'

    # bundlerepo uses "vfsmod.readonlyvfs(othervfs)", we need to make sure lfs
    # options and blob stores are passed from othervfs to the new readonlyvfs.
    wrapfunction(vfsmod.readonlyvfs, '__init__', wrapper.vfsinit)

    # when writing a bundle via "hg bundle" command, upload related LFS blobs
    wrapfunction(bundle2, 'writenewbundle', wrapper.writenewbundle)

@templatekeyword('lfs_files')
def lfsfiles(repo, ctx, **args):
    """List of strings. LFS files added or modified by the changeset."""
    args = pycompat.byteskwargs(args)

    pointers = wrapper.pointersfromctx(ctx) # {path: pointer}
    files = sorted(pointers.keys())

    makemap = lambda v: {
        'file': v,
        'oid': pointers[v].oid(),
    }

    # TODO: make the separator ', '?
    f = templatekw._showlist('lfs_file', files, args)
    return templatekw._hybrid(f, files, makemap, pycompat.identity)

@command('debuglfsupload',
         [('r', 'rev', [], _('upload large files introduced by REV'))])
def debuglfsupload(ui, repo, **opts):
    """upload lfs blobs added by the working copy parent or given revisions"""
    revs = opts.get('rev', [])
    pointers = wrapper.extractpointers(repo, scmutil.revrange(repo, revs))
    wrapper.uploadblobs(repo, pointers)