|
|
# shallowutil.py -- remotefilelog utilities
|
|
|
#
|
|
|
# Copyright 2014 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.
|
|
|
from __future__ import absolute_import
|
|
|
|
|
|
import collections
|
|
|
import errno
|
|
|
import hashlib
|
|
|
import os
|
|
|
import stat
|
|
|
import struct
|
|
|
import tempfile
|
|
|
|
|
|
from mercurial.i18n import _
|
|
|
from mercurial import (
|
|
|
error,
|
|
|
node,
|
|
|
pycompat,
|
|
|
revlog,
|
|
|
util,
|
|
|
)
|
|
|
from mercurial.utils import (
|
|
|
storageutil,
|
|
|
stringutil,
|
|
|
)
|
|
|
from . import constants
|
|
|
|
|
|
if not pycompat.iswindows:
|
|
|
import grp
|
|
|
|
|
|
|
|
|
def isenabled(repo):
|
|
|
"""returns whether the repository is remotefilelog enabled or not"""
|
|
|
return constants.SHALLOWREPO_REQUIREMENT in repo.requirements
|
|
|
|
|
|
|
|
|
def getcachekey(reponame, file, id):
|
|
|
pathhash = node.hex(hashlib.sha1(file).digest())
|
|
|
return os.path.join(reponame, pathhash[:2], pathhash[2:], id)
|
|
|
|
|
|
|
|
|
def getlocalkey(file, id):
|
|
|
pathhash = node.hex(hashlib.sha1(file).digest())
|
|
|
return os.path.join(pathhash, id)
|
|
|
|
|
|
|
|
|
def getcachepath(ui, allowempty=False):
|
|
|
cachepath = ui.config("remotefilelog", "cachepath")
|
|
|
if not cachepath:
|
|
|
if allowempty:
|
|
|
return None
|
|
|
else:
|
|
|
raise error.Abort(
|
|
|
_("could not find config option " "remotefilelog.cachepath")
|
|
|
)
|
|
|
return util.expandpath(cachepath)
|
|
|
|
|
|
|
|
|
def getcachepackpath(repo, category):
|
|
|
cachepath = getcachepath(repo.ui)
|
|
|
if category != constants.FILEPACK_CATEGORY:
|
|
|
return os.path.join(cachepath, repo.name, 'packs', category)
|
|
|
else:
|
|
|
return os.path.join(cachepath, repo.name, 'packs')
|
|
|
|
|
|
|
|
|
def getlocalpackpath(base, category):
|
|
|
return os.path.join(base, 'packs', category)
|
|
|
|
|
|
|
|
|
def createrevlogtext(text, copyfrom=None, copyrev=None):
|
|
|
"""returns a string that matches the revlog contents in a
|
|
|
traditional revlog
|
|
|
"""
|
|
|
meta = {}
|
|
|
if copyfrom or text.startswith('\1\n'):
|
|
|
if copyfrom:
|
|
|
meta['copy'] = copyfrom
|
|
|
meta['copyrev'] = copyrev
|
|
|
text = storageutil.packmeta(meta, text)
|
|
|
|
|
|
return text
|
|
|
|
|
|
|
|
|
def parsemeta(text):
|
|
|
"""parse mercurial filelog metadata"""
|
|
|
meta, size = storageutil.parsemeta(text)
|
|
|
if text.startswith('\1\n'):
|
|
|
s = text.index('\1\n', 2)
|
|
|
text = text[s + 2 :]
|
|
|
return meta or {}, text
|
|
|
|
|
|
|
|
|
def sumdicts(*dicts):
|
|
|
"""Adds all the values of *dicts together into one dictionary. This assumes
|
|
|
the values in *dicts are all summable.
|
|
|
|
|
|
e.g. [{'a': 4', 'b': 2}, {'b': 3, 'c': 1}] -> {'a': 4, 'b': 5, 'c': 1}
|
|
|
"""
|
|
|
result = collections.defaultdict(lambda: 0)
|
|
|
for dict in dicts:
|
|
|
for k, v in dict.iteritems():
|
|
|
result[k] += v
|
|
|
return result
|
|
|
|
|
|
|
|
|
def prefixkeys(dict, prefix):
|
|
|
"""Returns ``dict`` with ``prefix`` prepended to all its keys."""
|
|
|
result = {}
|
|
|
for k, v in dict.iteritems():
|
|
|
result[prefix + k] = v
|
|
|
return result
|
|
|
|
|
|
|
|
|
def reportpackmetrics(ui, prefix, *stores):
|
|
|
dicts = [s.getmetrics() for s in stores]
|
|
|
dict = prefixkeys(sumdicts(*dicts), prefix + '_')
|
|
|
ui.log(prefix + "_packsizes", "\n", **pycompat.strkwargs(dict))
|
|
|
|
|
|
|
|
|
def _parsepackmeta(metabuf):
|
|
|
"""parse datapack meta, bytes (<metadata-list>) -> dict
|
|
|
|
|
|
The dict contains raw content - both keys and values are strings.
|
|
|
Upper-level business may want to convert some of them to other types like
|
|
|
integers, on their own.
|
|
|
|
|
|
raise ValueError if the data is corrupted
|
|
|
"""
|
|
|
metadict = {}
|
|
|
offset = 0
|
|
|
buflen = len(metabuf)
|
|
|
while buflen - offset >= 3:
|
|
|
key = metabuf[offset : offset + 1]
|
|
|
offset += 1
|
|
|
metalen = struct.unpack_from('!H', metabuf, offset)[0]
|
|
|
offset += 2
|
|
|
if offset + metalen > buflen:
|
|
|
raise ValueError('corrupted metadata: incomplete buffer')
|
|
|
value = metabuf[offset : offset + metalen]
|
|
|
metadict[key] = value
|
|
|
offset += metalen
|
|
|
if offset != buflen:
|
|
|
raise ValueError('corrupted metadata: redundant data')
|
|
|
return metadict
|
|
|
|
|
|
|
|
|
def _buildpackmeta(metadict):
|
|
|
"""reverse of _parsepackmeta, dict -> bytes (<metadata-list>)
|
|
|
|
|
|
The dict contains raw content - both keys and values are strings.
|
|
|
Upper-level business may want to serialize some of other types (like
|
|
|
integers) to strings before calling this function.
|
|
|
|
|
|
raise ProgrammingError when metadata key is illegal, or ValueError if
|
|
|
length limit is exceeded
|
|
|
"""
|
|
|
metabuf = ''
|
|
|
for k, v in sorted((metadict or {}).iteritems()):
|
|
|
if len(k) != 1:
|
|
|
raise error.ProgrammingError('packmeta: illegal key: %s' % k)
|
|
|
if len(v) > 0xFFFE:
|
|
|
raise ValueError(
|
|
|
'metadata value is too long: 0x%x > 0xfffe' % len(v)
|
|
|
)
|
|
|
metabuf += k
|
|
|
metabuf += struct.pack('!H', len(v))
|
|
|
metabuf += v
|
|
|
# len(metabuf) is guaranteed representable in 4 bytes, because there are
|
|
|
# only 256 keys, and for each value, len(value) <= 0xfffe.
|
|
|
return metabuf
|
|
|
|
|
|
|
|
|
_metaitemtypes = {
|
|
|
constants.METAKEYFLAG: (int, pycompat.long),
|
|
|
constants.METAKEYSIZE: (int, pycompat.long),
|
|
|
}
|
|
|
|
|
|
|
|
|
def buildpackmeta(metadict):
|
|
|
"""like _buildpackmeta, but typechecks metadict and normalize it.
|
|
|
|
|
|
This means, METAKEYSIZE and METAKEYSIZE should have integers as values,
|
|
|
and METAKEYFLAG will be dropped if its value is 0.
|
|
|
"""
|
|
|
newmeta = {}
|
|
|
for k, v in (metadict or {}).iteritems():
|
|
|
expectedtype = _metaitemtypes.get(k, (bytes,))
|
|
|
if not isinstance(v, expectedtype):
|
|
|
raise error.ProgrammingError('packmeta: wrong type of key %s' % k)
|
|
|
# normalize int to binary buffer
|
|
|
if int in expectedtype:
|
|
|
# optimization: remove flag if it's 0 to save space
|
|
|
if k == constants.METAKEYFLAG and v == 0:
|
|
|
continue
|
|
|
v = int2bin(v)
|
|
|
newmeta[k] = v
|
|
|
return _buildpackmeta(newmeta)
|
|
|
|
|
|
|
|
|
def parsepackmeta(metabuf):
|
|
|
"""like _parsepackmeta, but convert fields to desired types automatically.
|
|
|
|
|
|
This means, METAKEYFLAG and METAKEYSIZE fields will be converted to
|
|
|
integers.
|
|
|
"""
|
|
|
metadict = _parsepackmeta(metabuf)
|
|
|
for k, v in metadict.iteritems():
|
|
|
if k in _metaitemtypes and int in _metaitemtypes[k]:
|
|
|
metadict[k] = bin2int(v)
|
|
|
return metadict
|
|
|
|
|
|
|
|
|
def int2bin(n):
|
|
|
"""convert a non-negative integer to raw binary buffer"""
|
|
|
buf = bytearray()
|
|
|
while n > 0:
|
|
|
buf.insert(0, n & 0xFF)
|
|
|
n >>= 8
|
|
|
return bytes(buf)
|
|
|
|
|
|
|
|
|
def bin2int(buf):
|
|
|
"""the reverse of int2bin, convert a binary buffer to an integer"""
|
|
|
x = 0
|
|
|
for b in bytearray(buf):
|
|
|
x <<= 8
|
|
|
x |= b
|
|
|
return x
|
|
|
|
|
|
|
|
|
def parsesizeflags(raw):
|
|
|
"""given a remotefilelog blob, return (headersize, rawtextsize, flags)
|
|
|
|
|
|
see remotefilelogserver.createfileblob for the format.
|
|
|
raise RuntimeError if the content is illformed.
|
|
|
"""
|
|
|
flags = revlog.REVIDX_DEFAULT_FLAGS
|
|
|
size = None
|
|
|
try:
|
|
|
index = raw.index('\0')
|
|
|
header = raw[:index]
|
|
|
if header.startswith('v'):
|
|
|
# v1 and above, header starts with 'v'
|
|
|
if header.startswith('v1\n'):
|
|
|
for s in header.split('\n'):
|
|
|
if s.startswith(constants.METAKEYSIZE):
|
|
|
size = int(s[len(constants.METAKEYSIZE) :])
|
|
|
elif s.startswith(constants.METAKEYFLAG):
|
|
|
flags = int(s[len(constants.METAKEYFLAG) :])
|
|
|
else:
|
|
|
raise RuntimeError(
|
|
|
'unsupported remotefilelog header: %s' % header
|
|
|
)
|
|
|
else:
|
|
|
# v0, str(int(size)) is the header
|
|
|
size = int(header)
|
|
|
except ValueError:
|
|
|
raise RuntimeError(r"unexpected remotefilelog header: illegal format")
|
|
|
if size is None:
|
|
|
raise RuntimeError(r"unexpected remotefilelog header: no size found")
|
|
|
return index + 1, size, flags
|
|
|
|
|
|
|
|
|
def buildfileblobheader(size, flags, version=None):
|
|
|
"""return the header of a remotefilelog blob.
|
|
|
|
|
|
see remotefilelogserver.createfileblob for the format.
|
|
|
approximately the reverse of parsesizeflags.
|
|
|
|
|
|
version could be 0 or 1, or None (auto decide).
|
|
|
"""
|
|
|
# choose v0 if flags is empty, otherwise v1
|
|
|
if version is None:
|
|
|
version = int(bool(flags))
|
|
|
if version == 1:
|
|
|
header = 'v1\n%s%d\n%s%d' % (
|
|
|
constants.METAKEYSIZE,
|
|
|
size,
|
|
|
constants.METAKEYFLAG,
|
|
|
flags,
|
|
|
)
|
|
|
elif version == 0:
|
|
|
if flags:
|
|
|
raise error.ProgrammingError('fileblob v0 does not support flag')
|
|
|
header = '%d' % size
|
|
|
else:
|
|
|
raise error.ProgrammingError('unknown fileblob version %d' % version)
|
|
|
return header
|
|
|
|
|
|
|
|
|
def ancestormap(raw):
|
|
|
offset, size, flags = parsesizeflags(raw)
|
|
|
start = offset + size
|
|
|
|
|
|
mapping = {}
|
|
|
while start < len(raw):
|
|
|
divider = raw.index('\0', start + 80)
|
|
|
|
|
|
currentnode = raw[start : (start + 20)]
|
|
|
p1 = raw[(start + 20) : (start + 40)]
|
|
|
p2 = raw[(start + 40) : (start + 60)]
|
|
|
linknode = raw[(start + 60) : (start + 80)]
|
|
|
copyfrom = raw[(start + 80) : divider]
|
|
|
|
|
|
mapping[currentnode] = (p1, p2, linknode, copyfrom)
|
|
|
start = divider + 1
|
|
|
|
|
|
return mapping
|
|
|
|
|
|
|
|
|
def readfile(path):
|
|
|
f = open(path, 'rb')
|
|
|
try:
|
|
|
result = f.read()
|
|
|
|
|
|
# we should never have empty files
|
|
|
if not result:
|
|
|
os.remove(path)
|
|
|
raise IOError("empty file: %s" % path)
|
|
|
|
|
|
return result
|
|
|
finally:
|
|
|
f.close()
|
|
|
|
|
|
|
|
|
def unlinkfile(filepath):
|
|
|
if pycompat.iswindows:
|
|
|
# On Windows, os.unlink cannnot delete readonly files
|
|
|
os.chmod(filepath, stat.S_IWUSR)
|
|
|
os.unlink(filepath)
|
|
|
|
|
|
|
|
|
def renamefile(source, destination):
|
|
|
if pycompat.iswindows:
|
|
|
# On Windows, os.rename cannot rename readonly files
|
|
|
# and cannot overwrite destination if it exists
|
|
|
os.chmod(source, stat.S_IWUSR)
|
|
|
if os.path.isfile(destination):
|
|
|
os.chmod(destination, stat.S_IWUSR)
|
|
|
os.unlink(destination)
|
|
|
|
|
|
os.rename(source, destination)
|
|
|
|
|
|
|
|
|
def writefile(path, content, readonly=False):
|
|
|
dirname, filename = os.path.split(path)
|
|
|
if not os.path.exists(dirname):
|
|
|
try:
|
|
|
os.makedirs(dirname)
|
|
|
except OSError as ex:
|
|
|
if ex.errno != errno.EEXIST:
|
|
|
raise
|
|
|
|
|
|
fd, temp = tempfile.mkstemp(prefix='.%s-' % filename, dir=dirname)
|
|
|
os.close(fd)
|
|
|
|
|
|
try:
|
|
|
f = util.posixfile(temp, 'wb')
|
|
|
f.write(content)
|
|
|
f.close()
|
|
|
|
|
|
if readonly:
|
|
|
mode = 0o444
|
|
|
else:
|
|
|
# tempfiles are created with 0o600, so we need to manually set the
|
|
|
# mode.
|
|
|
oldumask = os.umask(0)
|
|
|
# there's no way to get the umask without modifying it, so set it
|
|
|
# back
|
|
|
os.umask(oldumask)
|
|
|
mode = ~oldumask
|
|
|
|
|
|
renamefile(temp, path)
|
|
|
os.chmod(path, mode)
|
|
|
except Exception:
|
|
|
try:
|
|
|
unlinkfile(temp)
|
|
|
except OSError:
|
|
|
pass
|
|
|
raise
|
|
|
|
|
|
|
|
|
def sortnodes(nodes, parentfunc):
|
|
|
"""Topologically sorts the nodes, using the parentfunc to find
|
|
|
the parents of nodes."""
|
|
|
nodes = set(nodes)
|
|
|
childmap = {}
|
|
|
parentmap = {}
|
|
|
roots = []
|
|
|
|
|
|
# Build a child and parent map
|
|
|
for n in nodes:
|
|
|
parents = [p for p in parentfunc(n) if p in nodes]
|
|
|
parentmap[n] = set(parents)
|
|
|
for p in parents:
|
|
|
childmap.setdefault(p, set()).add(n)
|
|
|
if not parents:
|
|
|
roots.append(n)
|
|
|
|
|
|
roots.sort()
|
|
|
# Process roots, adding children to the queue as they become roots
|
|
|
results = []
|
|
|
while roots:
|
|
|
n = roots.pop(0)
|
|
|
results.append(n)
|
|
|
if n in childmap:
|
|
|
children = childmap[n]
|
|
|
for c in children:
|
|
|
childparents = parentmap[c]
|
|
|
childparents.remove(n)
|
|
|
if len(childparents) == 0:
|
|
|
# insert at the beginning, that way child nodes
|
|
|
# are likely to be output immediately after their
|
|
|
# parents. This gives better compression results.
|
|
|
roots.insert(0, c)
|
|
|
|
|
|
return results
|
|
|
|
|
|
|
|
|
def readexactly(stream, n):
|
|
|
'''read n bytes from stream.read and abort if less was available'''
|
|
|
s = stream.read(n)
|
|
|
if len(s) < n:
|
|
|
raise error.Abort(
|
|
|
_("stream ended unexpectedly" " (got %d bytes, expected %d)")
|
|
|
% (len(s), n)
|
|
|
)
|
|
|
return s
|
|
|
|
|
|
|
|
|
def readunpack(stream, fmt):
|
|
|
data = readexactly(stream, struct.calcsize(fmt))
|
|
|
return struct.unpack(fmt, data)
|
|
|
|
|
|
|
|
|
def readpath(stream):
|
|
|
rawlen = readexactly(stream, constants.FILENAMESIZE)
|
|
|
pathlen = struct.unpack(constants.FILENAMESTRUCT, rawlen)[0]
|
|
|
return readexactly(stream, pathlen)
|
|
|
|
|
|
|
|
|
def readnodelist(stream):
|
|
|
rawlen = readexactly(stream, constants.NODECOUNTSIZE)
|
|
|
nodecount = struct.unpack(constants.NODECOUNTSTRUCT, rawlen)[0]
|
|
|
for i in pycompat.xrange(nodecount):
|
|
|
yield readexactly(stream, constants.NODESIZE)
|
|
|
|
|
|
|
|
|
def readpathlist(stream):
|
|
|
rawlen = readexactly(stream, constants.PATHCOUNTSIZE)
|
|
|
pathcount = struct.unpack(constants.PATHCOUNTSTRUCT, rawlen)[0]
|
|
|
for i in pycompat.xrange(pathcount):
|
|
|
yield readpath(stream)
|
|
|
|
|
|
|
|
|
def getgid(groupname):
|
|
|
try:
|
|
|
gid = grp.getgrnam(pycompat.fsdecode(groupname)).gr_gid
|
|
|
return gid
|
|
|
except KeyError:
|
|
|
return None
|
|
|
|
|
|
|
|
|
def setstickygroupdir(path, gid, warn=None):
|
|
|
if gid is None:
|
|
|
return
|
|
|
try:
|
|
|
os.chown(path, -1, gid)
|
|
|
os.chmod(path, 0o2775)
|
|
|
except (IOError, OSError) as ex:
|
|
|
if warn:
|
|
|
warn(_('unable to chown/chmod on %s: %s\n') % (path, ex))
|
|
|
|
|
|
|
|
|
def mkstickygroupdir(ui, path):
|
|
|
"""Creates the given directory (if it doesn't exist) and give it a
|
|
|
particular group with setgid enabled."""
|
|
|
gid = None
|
|
|
groupname = ui.config("remotefilelog", "cachegroup")
|
|
|
if groupname:
|
|
|
gid = getgid(groupname)
|
|
|
if gid is None:
|
|
|
ui.warn(_('unable to resolve group name: %s\n') % groupname)
|
|
|
|
|
|
# we use a single stat syscall to test the existence and mode / group bit
|
|
|
st = None
|
|
|
try:
|
|
|
st = os.stat(path)
|
|
|
except OSError:
|
|
|
pass
|
|
|
|
|
|
if st:
|
|
|
# exists
|
|
|
if (st.st_mode & 0o2775) != 0o2775 or st.st_gid != gid:
|
|
|
# permission needs to be fixed
|
|
|
setstickygroupdir(path, gid, ui.warn)
|
|
|
return
|
|
|
|
|
|
oldumask = os.umask(0o002)
|
|
|
try:
|
|
|
missingdirs = [path]
|
|
|
path = os.path.dirname(path)
|
|
|
while path and not os.path.exists(path):
|
|
|
missingdirs.append(path)
|
|
|
path = os.path.dirname(path)
|
|
|
|
|
|
for path in reversed(missingdirs):
|
|
|
try:
|
|
|
os.mkdir(path)
|
|
|
except OSError as ex:
|
|
|
if ex.errno != errno.EEXIST:
|
|
|
raise
|
|
|
|
|
|
for path in missingdirs:
|
|
|
setstickygroupdir(path, gid, ui.warn)
|
|
|
finally:
|
|
|
os.umask(oldumask)
|
|
|
|
|
|
|
|
|
def getusername(ui):
|
|
|
try:
|
|
|
return stringutil.shortuser(ui.username())
|
|
|
except Exception:
|
|
|
return 'unknown'
|
|
|
|
|
|
|
|
|
def getreponame(ui):
|
|
|
reponame = ui.config('paths', 'default')
|
|
|
if reponame:
|
|
|
return os.path.basename(reponame)
|
|
|
return "unknown"
|
|
|
|
