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# blobstore.py - local and remote (speaking Git-LFS protocol) blob storages
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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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from __future__ import absolute_import
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import errno
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import hashlib
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import json
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import os
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import re
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import socket
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from mercurial.i18n import _
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from mercurial import (
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error,
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pathutil,
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pycompat,
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url as urlmod,
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util,
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vfs as vfsmod,
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worker,
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)
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from ..largefiles import lfutil
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# 64 bytes for SHA256
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_lfsre = re.compile(br'\A[a-f0-9]{64}\Z')
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class lfsvfs(vfsmod.vfs):
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def join(self, path):
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"""split the path at first two characters, like: XX/XXXXX..."""
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if not _lfsre.match(path):
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raise error.ProgrammingError('unexpected lfs path: %s' % path)
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return super(lfsvfs, self).join(path[0:2], path[2:])
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def walk(self, path=None, onerror=None):
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"""Yield (dirpath, [], oids) tuple for blobs under path
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Oids only exist in the root of this vfs, so dirpath is always ''.
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"""
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root = os.path.normpath(self.base)
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# when dirpath == root, dirpath[prefixlen:] becomes empty
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# because len(dirpath) < prefixlen.
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prefixlen = len(pathutil.normasprefix(root))
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oids = []
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for dirpath, dirs, files in os.walk(self.reljoin(self.base, path or ''),
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onerror=onerror):
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dirpath = dirpath[prefixlen:]
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# Silently skip unexpected files and directories
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if len(dirpath) == 2:
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oids.extend([dirpath + f for f in files
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if _lfsre.match(dirpath + f)])
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yield ('', [], oids)
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class nullvfs(lfsvfs):
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def __init__(self):
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pass
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def exists(self, oid):
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return False
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def read(self, oid):
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# store.read() calls into here if the blob doesn't exist in its
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# self.vfs. Raise the same error as a normal vfs when asked to read a
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# file that doesn't exist. The only difference is the full file path
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# isn't available in the error.
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raise IOError(errno.ENOENT, '%s: No such file or directory' % oid)
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def walk(self, path=None, onerror=None):
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return ('', [], [])
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def write(self, oid, data):
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pass
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class filewithprogress(object):
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"""a file-like object that supports __len__ and read.
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Useful to provide progress information for how many bytes are read.
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"""
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def __init__(self, fp, callback):
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self._fp = fp
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self._callback = callback # func(readsize)
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fp.seek(0, os.SEEK_END)
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self._len = fp.tell()
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fp.seek(0)
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def __len__(self):
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return self._len
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def read(self, size):
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if self._fp is None:
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return b''
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data = self._fp.read(size)
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if data:
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if self._callback:
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self._callback(len(data))
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else:
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self._fp.close()
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self._fp = None
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return data
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class local(object):
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"""Local blobstore for large file contents.
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This blobstore is used both as a cache and as a staging area for large blobs
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to be uploaded to the remote blobstore.
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"""
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def __init__(self, repo):
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fullpath = repo.svfs.join('lfs/objects')
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self.vfs = lfsvfs(fullpath)
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if repo.ui.configbool('experimental', 'lfs.disableusercache'):
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self.cachevfs = nullvfs()
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else:
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usercache = lfutil._usercachedir(repo.ui, 'lfs')
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self.cachevfs = lfsvfs(usercache)
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self.ui = repo.ui
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def open(self, oid):
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"""Open a read-only file descriptor to the named blob, in either the
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usercache or the local store."""
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# The usercache is the most likely place to hold the file. Commit will
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# write to both it and the local store, as will anything that downloads
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# the blobs. However, things like clone without an update won't
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# populate the local store. For an init + push of a local clone,
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# the usercache is the only place it _could_ be. If not present, the
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# missing file msg here will indicate the local repo, not the usercache.
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if self.cachevfs.exists(oid):
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return self.cachevfs(oid, 'rb')
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return self.vfs(oid, 'rb')
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def download(self, oid, src):
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"""Read the blob from the remote source in chunks, verify the content,
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and write to this local blobstore."""
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sha256 = hashlib.sha256()
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with self.vfs(oid, 'wb', atomictemp=True) as fp:
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for chunk in util.filechunkiter(src, size=1048576):
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fp.write(chunk)
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sha256.update(chunk)
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realoid = sha256.hexdigest()
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if realoid != oid:
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raise LfsCorruptionError(_('corrupt remote lfs object: %s')
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% oid)
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self._linktousercache(oid)
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def write(self, oid, data):
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"""Write blob to local blobstore.
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This should only be called from the filelog during a commit or similar.
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As such, there is no need to verify the data. Imports from a remote
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store must use ``download()`` instead."""
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with self.vfs(oid, 'wb', atomictemp=True) as fp:
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fp.write(data)
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self._linktousercache(oid)
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def linkfromusercache(self, oid):
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"""Link blobs found in the user cache into this store.
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The server module needs to do this when it lets the client know not to
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upload the blob, to ensure it is always available in this store.
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Normally this is done implicitly when the client reads or writes the
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blob, but that doesn't happen when the server tells the client that it
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already has the blob.
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"""
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if (not isinstance(self.cachevfs, nullvfs)
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and not self.vfs.exists(oid)):
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self.ui.note(_('lfs: found %s in the usercache\n') % oid)
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lfutil.link(self.cachevfs.join(oid), self.vfs.join(oid))
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def _linktousercache(self, oid):
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# XXX: should we verify the content of the cache, and hardlink back to
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# the local store on success, but truncate, write and link on failure?
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if (not self.cachevfs.exists(oid)
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and not isinstance(self.cachevfs, nullvfs)):
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self.ui.note(_('lfs: adding %s to the usercache\n') % oid)
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lfutil.link(self.vfs.join(oid), self.cachevfs.join(oid))
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def read(self, oid, verify=True):
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"""Read blob from local blobstore."""
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if not self.vfs.exists(oid):
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blob = self._read(self.cachevfs, oid, verify)
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# Even if revlog will verify the content, it needs to be verified
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# now before making the hardlink to avoid propagating corrupt blobs.
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# Don't abort if corruption is detected, because `hg verify` will
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# give more useful info about the corruption- simply don't add the
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# hardlink.
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if verify or hashlib.sha256(blob).hexdigest() == oid:
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self.ui.note(_('lfs: found %s in the usercache\n') % oid)
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lfutil.link(self.cachevfs.join(oid), self.vfs.join(oid))
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else:
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self.ui.note(_('lfs: found %s in the local lfs store\n') % oid)
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blob = self._read(self.vfs, oid, verify)
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return blob
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def _read(self, vfs, oid, verify):
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"""Read blob (after verifying) from the given store"""
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blob = vfs.read(oid)
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if verify:
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_verify(oid, blob)
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return blob
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def verify(self, oid):
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"""Indicate whether or not the hash of the underlying file matches its
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name."""
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sha256 = hashlib.sha256()
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with self.open(oid) as fp:
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for chunk in util.filechunkiter(fp, size=1048576):
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sha256.update(chunk)
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return oid == sha256.hexdigest()
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def has(self, oid):
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"""Returns True if the local blobstore contains the requested blob,
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False otherwise."""
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return self.cachevfs.exists(oid) or self.vfs.exists(oid)
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class _gitlfsremote(object):
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def __init__(self, repo, url):
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ui = repo.ui
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self.ui = ui
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baseurl, authinfo = url.authinfo()
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self.baseurl = baseurl.rstrip('/')
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useragent = repo.ui.config('experimental', 'lfs.user-agent')
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if not useragent:
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useragent = 'git-lfs/2.3.4 (Mercurial %s)' % util.version()
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self.urlopener = urlmod.opener(ui, authinfo, useragent)
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self.retry = ui.configint('lfs', 'retry')
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def writebatch(self, pointers, fromstore):
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"""Batch upload from local to remote blobstore."""
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self._batch(_deduplicate(pointers), fromstore, 'upload')
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def readbatch(self, pointers, tostore):
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"""Batch download from remote to local blostore."""
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self._batch(_deduplicate(pointers), tostore, 'download')
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def _batchrequest(self, pointers, action):
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"""Get metadata about objects pointed by pointers for given action
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Return decoded JSON object like {'objects': [{'oid': '', 'size': 1}]}
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See https://github.com/git-lfs/git-lfs/blob/master/docs/api/batch.md
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"""
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objects = [{'oid': p.oid(), 'size': p.size()} for p in pointers]
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requestdata = json.dumps({
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'objects': objects,
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'operation': action,
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})
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batchreq = util.urlreq.request('%s/objects/batch' % self.baseurl,
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data=requestdata)
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batchreq.add_header('Accept', 'application/vnd.git-lfs+json')
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batchreq.add_header('Content-Type', 'application/vnd.git-lfs+json')
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try:
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rsp = self.urlopener.open(batchreq)
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rawjson = rsp.read()
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except util.urlerr.httperror as ex:
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raise LfsRemoteError(_('LFS HTTP error: %s (action=%s)')
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% (ex, action))
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try:
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response = json.loads(rawjson)
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except ValueError:
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raise LfsRemoteError(_('LFS server returns invalid JSON: %s')
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% rawjson)
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if self.ui.debugflag:
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self.ui.debug('Status: %d\n' % rsp.status)
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# lfs-test-server and hg serve return headers in different order
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self.ui.debug('%s\n'
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% '\n'.join(sorted(str(rsp.info()).splitlines())))
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if 'objects' in response:
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response['objects'] = sorted(response['objects'],
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key=lambda p: p['oid'])
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self.ui.debug('%s\n'
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% json.dumps(response, indent=2,
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separators=('', ': '), sort_keys=True))
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return response
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def _checkforservererror(self, pointers, responses, action):
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"""Scans errors from objects
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Raises LfsRemoteError if any objects have an error"""
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for response in responses:
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# The server should return 404 when objects cannot be found. Some
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# server implementation (ex. lfs-test-server) does not set "error"
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# but just removes "download" from "actions". Treat that case
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# as the same as 404 error.
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if 'error' not in response:
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if (action == 'download'
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and action not in response.get('actions', [])):
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code = 404
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else:
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continue
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else:
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# An error dict without a code doesn't make much sense, so
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# treat as a server error.
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code = response.get('error').get('code', 500)
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ptrmap = {p.oid(): p for p in pointers}
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p = ptrmap.get(response['oid'], None)
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if p:
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filename = getattr(p, 'filename', 'unknown')
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errors = {
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404: 'The object does not exist',
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410: 'The object was removed by the owner',
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422: 'Validation error',
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500: 'Internal server error',
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}
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msg = errors.get(code, 'status code %d' % code)
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raise LfsRemoteError(_('LFS server error for "%s": %s')
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% (filename, msg))
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else:
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raise LfsRemoteError(
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_('LFS server error. Unsolicited response for oid %s')
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% response['oid'])
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def _extractobjects(self, response, pointers, action):
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"""extract objects from response of the batch API
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response: parsed JSON object returned by batch API
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return response['objects'] filtered by action
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raise if any object has an error
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"""
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# Scan errors from objects - fail early
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objects = response.get('objects', [])
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self._checkforservererror(pointers, objects, action)
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# Filter objects with given action. Practically, this skips uploading
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# objects which exist in the server.
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filteredobjects = [o for o in objects if action in o.get('actions', [])]
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return filteredobjects
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def _basictransfer(self, obj, action, localstore):
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"""Download or upload a single object using basic transfer protocol
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obj: dict, an object description returned by batch API
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action: string, one of ['upload', 'download']
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localstore: blobstore.local
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See https://github.com/git-lfs/git-lfs/blob/master/docs/api/\
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basic-transfers.md
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"""
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oid = pycompat.bytestr(obj['oid'])
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href = pycompat.bytestr(obj['actions'][action].get('href'))
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headers = obj['actions'][action].get('header', {}).items()
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request = util.urlreq.request(href)
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if action == 'upload':
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# If uploading blobs, read data from local blobstore.
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if not localstore.verify(oid):
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raise error.Abort(_('detected corrupt lfs object: %s') % oid,
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hint=_('run hg verify'))
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request.data = filewithprogress(localstore.open(oid), None)
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request.get_method = lambda: 'PUT'
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request.add_header('Content-Type', 'application/octet-stream')
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for k, v in headers:
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request.add_header(k, v)
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response = b''
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try:
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req = self.urlopener.open(request)
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if self.ui.debugflag:
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self.ui.debug('Status: %d\n' % req.status)
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# lfs-test-server and hg serve return headers in different order
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self.ui.debug('%s\n'
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% '\n'.join(sorted(str(req.info()).splitlines())))
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if action == 'download':
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# If downloading blobs, store downloaded data to local blobstore
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localstore.download(oid, req)
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else:
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while True:
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data = req.read(1048576)
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if not data:
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break
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response += data
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if response:
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self.ui.debug('lfs %s response: %s' % (action, response))
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except util.urlerr.httperror as ex:
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if self.ui.debugflag:
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self.ui.debug('%s: %s\n' % (oid, ex.read()))
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raise LfsRemoteError(_('HTTP error: %s (oid=%s, action=%s)')
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% (ex, oid, action))
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def _batch(self, pointers, localstore, action):
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if action not in ['upload', 'download']:
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raise error.ProgrammingError('invalid Git-LFS action: %s' % action)
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response = self._batchrequest(pointers, action)
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objects = self._extractobjects(response, pointers, action)
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total = sum(x.get('size', 0) for x in objects)
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sizes = {}
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for obj in objects:
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sizes[obj.get('oid')] = obj.get('size', 0)
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topic = {'upload': _('lfs uploading'),
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'download': _('lfs downloading')}[action]
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if len(objects) > 1:
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self.ui.note(_('lfs: need to transfer %d objects (%s)\n')
|
|
|
% (len(objects), util.bytecount(total)))
|
|
|
|
|
|
def transfer(chunk):
|
|
|
for obj in chunk:
|
|
|
objsize = obj.get('size', 0)
|
|
|
if self.ui.verbose:
|
|
|
if action == 'download':
|
|
|
msg = _('lfs: downloading %s (%s)\n')
|
|
|
elif action == 'upload':
|
|
|
msg = _('lfs: uploading %s (%s)\n')
|
|
|
self.ui.note(msg % (obj.get('oid'),
|
|
|
util.bytecount(objsize)))
|
|
|
retry = self.retry
|
|
|
while True:
|
|
|
try:
|
|
|
self._basictransfer(obj, action, localstore)
|
|
|
yield 1, obj.get('oid')
|
|
|
break
|
|
|
except socket.error as ex:
|
|
|
if retry > 0:
|
|
|
self.ui.note(
|
|
|
_('lfs: failed: %r (remaining retry %d)\n')
|
|
|
% (ex, retry))
|
|
|
retry -= 1
|
|
|
continue
|
|
|
raise
|
|
|
|
|
|
# Until https multiplexing gets sorted out
|
|
|
if self.ui.configbool('experimental', 'lfs.worker-enable'):
|
|
|
oids = worker.worker(self.ui, 0.1, transfer, (),
|
|
|
sorted(objects, key=lambda o: o.get('oid')))
|
|
|
else:
|
|
|
oids = transfer(sorted(objects, key=lambda o: o.get('oid')))
|
|
|
|
|
|
with self.ui.makeprogress(topic, total=total) as progress:
|
|
|
progress.update(0)
|
|
|
processed = 0
|
|
|
blobs = 0
|
|
|
for _one, oid in oids:
|
|
|
processed += sizes[oid]
|
|
|
blobs += 1
|
|
|
progress.update(processed)
|
|
|
self.ui.note(_('lfs: processed: %s\n') % oid)
|
|
|
|
|
|
if blobs > 0:
|
|
|
if action == 'upload':
|
|
|
self.ui.status(_('lfs: uploaded %d files (%s)\n')
|
|
|
% (blobs, util.bytecount(processed)))
|
|
|
elif action == 'download':
|
|
|
self.ui.status(_('lfs: downloaded %d files (%s)\n')
|
|
|
% (blobs, util.bytecount(processed)))
|
|
|
|
|
|
def __del__(self):
|
|
|
# copied from mercurial/httppeer.py
|
|
|
urlopener = getattr(self, 'urlopener', None)
|
|
|
if urlopener:
|
|
|
for h in urlopener.handlers:
|
|
|
h.close()
|
|
|
getattr(h, "close_all", lambda : None)()
|
|
|
|
|
|
class _dummyremote(object):
|
|
|
"""Dummy store storing blobs to temp directory."""
|
|
|
|
|
|
def __init__(self, repo, url):
|
|
|
fullpath = repo.vfs.join('lfs', url.path)
|
|
|
self.vfs = lfsvfs(fullpath)
|
|
|
|
|
|
def writebatch(self, pointers, fromstore):
|
|
|
for p in _deduplicate(pointers):
|
|
|
content = fromstore.read(p.oid(), verify=True)
|
|
|
with self.vfs(p.oid(), 'wb', atomictemp=True) as fp:
|
|
|
fp.write(content)
|
|
|
|
|
|
def readbatch(self, pointers, tostore):
|
|
|
for p in _deduplicate(pointers):
|
|
|
with self.vfs(p.oid(), 'rb') as fp:
|
|
|
tostore.download(p.oid(), fp)
|
|
|
|
|
|
class _nullremote(object):
|
|
|
"""Null store storing blobs to /dev/null."""
|
|
|
|
|
|
def __init__(self, repo, url):
|
|
|
pass
|
|
|
|
|
|
def writebatch(self, pointers, fromstore):
|
|
|
pass
|
|
|
|
|
|
def readbatch(self, pointers, tostore):
|
|
|
pass
|
|
|
|
|
|
class _promptremote(object):
|
|
|
"""Prompt user to set lfs.url when accessed."""
|
|
|
|
|
|
def __init__(self, repo, url):
|
|
|
pass
|
|
|
|
|
|
def writebatch(self, pointers, fromstore, ui=None):
|
|
|
self._prompt()
|
|
|
|
|
|
def readbatch(self, pointers, tostore, ui=None):
|
|
|
self._prompt()
|
|
|
|
|
|
def _prompt(self):
|
|
|
raise error.Abort(_('lfs.url needs to be configured'))
|
|
|
|
|
|
_storemap = {
|
|
|
'https': _gitlfsremote,
|
|
|
'http': _gitlfsremote,
|
|
|
'file': _dummyremote,
|
|
|
'null': _nullremote,
|
|
|
None: _promptremote,
|
|
|
}
|
|
|
|
|
|
def _deduplicate(pointers):
|
|
|
"""Remove any duplicate oids that exist in the list"""
|
|
|
reduced = util.sortdict()
|
|
|
for p in pointers:
|
|
|
reduced[p.oid()] = p
|
|
|
return reduced.values()
|
|
|
|
|
|
def _verify(oid, content):
|
|
|
realoid = hashlib.sha256(content).hexdigest()
|
|
|
if realoid != oid:
|
|
|
raise LfsCorruptionError(_('detected corrupt lfs object: %s') % oid,
|
|
|
hint=_('run hg verify'))
|
|
|
|
|
|
def remote(repo, remote=None):
|
|
|
"""remotestore factory. return a store in _storemap depending on config
|
|
|
|
|
|
If ``lfs.url`` is specified, use that remote endpoint. Otherwise, try to
|
|
|
infer the endpoint, based on the remote repository using the same path
|
|
|
adjustments as git. As an extension, 'http' is supported as well so that
|
|
|
``hg serve`` works out of the box.
|
|
|
|
|
|
https://github.com/git-lfs/git-lfs/blob/master/docs/api/server-discovery.md
|
|
|
"""
|
|
|
lfsurl = repo.ui.config('lfs', 'url')
|
|
|
url = util.url(lfsurl or '')
|
|
|
if lfsurl is None:
|
|
|
if remote:
|
|
|
path = remote
|
|
|
elif util.safehasattr(repo, '_subtoppath'):
|
|
|
# The pull command sets this during the optional update phase, which
|
|
|
# tells exactly where the pull originated, whether 'paths.default'
|
|
|
# or explicit.
|
|
|
path = repo._subtoppath
|
|
|
else:
|
|
|
# TODO: investigate 'paths.remote:lfsurl' style path customization,
|
|
|
# and fall back to inferring from 'paths.remote' if unspecified.
|
|
|
path = repo.ui.config('paths', 'default') or ''
|
|
|
|
|
|
defaulturl = util.url(path)
|
|
|
|
|
|
# TODO: support local paths as well.
|
|
|
# TODO: consider the ssh -> https transformation that git applies
|
|
|
if defaulturl.scheme in (b'http', b'https'):
|
|
|
if defaulturl.path and defaulturl.path[:-1] != b'/':
|
|
|
defaulturl.path += b'/'
|
|
|
defaulturl.path = (defaulturl.path or b'') + b'.git/info/lfs'
|
|
|
|
|
|
url = util.url(bytes(defaulturl))
|
|
|
repo.ui.note(_('lfs: assuming remote store: %s\n') % url)
|
|
|
|
|
|
scheme = url.scheme
|
|
|
if scheme not in _storemap:
|
|
|
raise error.Abort(_('lfs: unknown url scheme: %s') % scheme)
|
|
|
return _storemap[scheme](repo, url)
|
|
|
|
|
|
class LfsRemoteError(error.StorageError):
|
|
|
pass
|
|
|
|
|
|
class LfsCorruptionError(error.Abort):
|
|
|
"""Raised when a corrupt blob is detected, aborting an operation
|
|
|
|
|
|
It exists to allow specialized handling on the server side."""
|
|
|
|
