# 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:pass@example.com/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

    # 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,

    context,

    exchange,

    extensions,

    filelog,

    hg,

    localrepo,

    node,

    registrar,

    revlog,

    scmutil,

    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,

)

configitem('lfs', 'threshold',

    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

    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(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."""

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

    return sorted(pointers.keys())

@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)