path: extract the path validation logic into its own submethod
We will need to re-use this logic for `path://` so we first extract it into its own method.
Differential Revision: https://phab.mercurial-scm.org/D10261
# bundlecaches.py - utility to deal with pre-computed bundle for servers
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
from .i18n import _
from .thirdparty import attr
from . import (
error,
requirements as requirementsmod,
sslutil,
util,
)
from .utils import stringutil
urlreq = util.urlreq
CB_MANIFEST_FILE = b'clonebundles.manifest'
@attr.s
class bundlespec(object):
compression = attr.ib()
wirecompression = attr.ib()
version = attr.ib()
wireversion = attr.ib()
params = attr.ib()
contentopts = attr.ib()
# Maps bundle version human names to changegroup versions.
_bundlespeccgversions = {
b'v1': b'01',
b'v2': b'02',
b'packed1': b's1',
b'bundle2': b'02', # legacy
}
# Maps bundle version with content opts to choose which part to bundle
_bundlespeccontentopts = {
b'v1': {
b'changegroup': True,
b'cg.version': b'01',
b'obsolescence': False,
b'phases': False,
b'tagsfnodescache': False,
b'revbranchcache': False,
},
b'v2': {
b'changegroup': True,
b'cg.version': b'02',
b'obsolescence': False,
b'phases': False,
b'tagsfnodescache': True,
b'revbranchcache': True,
},
b'packed1': {b'cg.version': b's1'},
}
_bundlespeccontentopts[b'bundle2'] = _bundlespeccontentopts[b'v2']
_bundlespecvariants = {
b"streamv2": {
b"changegroup": False,
b"streamv2": True,
b"tagsfnodescache": False,
b"revbranchcache": False,
}
}
# Compression engines allowed in version 1. THIS SHOULD NEVER CHANGE.
_bundlespecv1compengines = {b'gzip', b'bzip2', b'none'}
def parsebundlespec(repo, spec, strict=True):
"""Parse a bundle string specification into parts.
Bundle specifications denote a well-defined bundle/exchange format.
The content of a given specification should not change over time in
order to ensure that bundles produced by a newer version of Mercurial are
readable from an older version.
The string currently has the form:
<compression>-<type>[;<parameter0>[;<parameter1>]]
Where <compression> is one of the supported compression formats
and <type> is (currently) a version string. A ";" can follow the type and
all text afterwards is interpreted as URI encoded, ";" delimited key=value
pairs.
If ``strict`` is True (the default) <compression> is required. Otherwise,
it is optional.
Returns a bundlespec object of (compression, version, parameters).
Compression will be ``None`` if not in strict mode and a compression isn't
defined.
An ``InvalidBundleSpecification`` is raised when the specification is
not syntactically well formed.
An ``UnsupportedBundleSpecification`` is raised when the compression or
bundle type/version is not recognized.
Note: this function will likely eventually return a more complex data
structure, including bundle2 part information.
"""
def parseparams(s):
if b';' not in s:
return s, {}
params = {}
version, paramstr = s.split(b';', 1)
for p in paramstr.split(b';'):
if b'=' not in p:
raise error.InvalidBundleSpecification(
_(
b'invalid bundle specification: '
b'missing "=" in parameter: %s'
)
% p
)
key, value = p.split(b'=', 1)
key = urlreq.unquote(key)
value = urlreq.unquote(value)
params[key] = value
return version, params
if strict and b'-' not in spec:
raise error.InvalidBundleSpecification(
_(
b'invalid bundle specification; '
b'must be prefixed with compression: %s'
)
% spec
)
if b'-' in spec:
compression, version = spec.split(b'-', 1)
if compression not in util.compengines.supportedbundlenames:
raise error.UnsupportedBundleSpecification(
_(b'%s compression is not supported') % compression
)
version, params = parseparams(version)
if version not in _bundlespeccgversions:
raise error.UnsupportedBundleSpecification(
_(b'%s is not a recognized bundle version') % version
)
else:
# Value could be just the compression or just the version, in which
# case some defaults are assumed (but only when not in strict mode).
assert not strict
spec, params = parseparams(spec)
if spec in util.compengines.supportedbundlenames:
compression = spec
version = b'v1'
# Generaldelta repos require v2.
if requirementsmod.GENERALDELTA_REQUIREMENT in repo.requirements:
version = b'v2'
# Modern compression engines require v2.
if compression not in _bundlespecv1compengines:
version = b'v2'
elif spec in _bundlespeccgversions:
if spec == b'packed1':
compression = b'none'
else:
compression = b'bzip2'
version = spec
else:
raise error.UnsupportedBundleSpecification(
_(b'%s is not a recognized bundle specification') % spec
)
# Bundle version 1 only supports a known set of compression engines.
if version == b'v1' and compression not in _bundlespecv1compengines:
raise error.UnsupportedBundleSpecification(
_(b'compression engine %s is not supported on v1 bundles')
% compression
)
# The specification for packed1 can optionally declare the data formats
# required to apply it. If we see this metadata, compare against what the
# repo supports and error if the bundle isn't compatible.
if version == b'packed1' and b'requirements' in params:
requirements = set(params[b'requirements'].split(b','))
missingreqs = requirements - repo.supportedformats
if missingreqs:
raise error.UnsupportedBundleSpecification(
_(b'missing support for repository features: %s')
% b', '.join(sorted(missingreqs))
)
# Compute contentopts based on the version
contentopts = _bundlespeccontentopts.get(version, {}).copy()
# Process the variants
if b"stream" in params and params[b"stream"] == b"v2":
variant = _bundlespecvariants[b"streamv2"]
contentopts.update(variant)
engine = util.compengines.forbundlename(compression)
compression, wirecompression = engine.bundletype()
wireversion = _bundlespeccgversions[version]
return bundlespec(
compression, wirecompression, version, wireversion, params, contentopts
)
def parseclonebundlesmanifest(repo, s):
"""Parses the raw text of a clone bundles manifest.
Returns a list of dicts. The dicts have a ``URL`` key corresponding
to the URL and other keys are the attributes for the entry.
"""
m = []
for line in s.splitlines():
fields = line.split()
if not fields:
continue
attrs = {b'URL': fields[0]}
for rawattr in fields[1:]:
key, value = rawattr.split(b'=', 1)
key = util.urlreq.unquote(key)
value = util.urlreq.unquote(value)
attrs[key] = value
# Parse BUNDLESPEC into components. This makes client-side
# preferences easier to specify since you can prefer a single
# component of the BUNDLESPEC.
if key == b'BUNDLESPEC':
try:
bundlespec = parsebundlespec(repo, value)
attrs[b'COMPRESSION'] = bundlespec.compression
attrs[b'VERSION'] = bundlespec.version
except error.InvalidBundleSpecification:
pass
except error.UnsupportedBundleSpecification:
pass
m.append(attrs)
return m
def isstreamclonespec(bundlespec):
# Stream clone v1
if bundlespec.wirecompression == b'UN' and bundlespec.wireversion == b's1':
return True
# Stream clone v2
if (
bundlespec.wirecompression == b'UN'
and bundlespec.wireversion == b'02'
and bundlespec.contentopts.get(b'streamv2')
):
return True
return False
def filterclonebundleentries(repo, entries, streamclonerequested=False):
"""Remove incompatible clone bundle manifest entries.
Accepts a list of entries parsed with ``parseclonebundlesmanifest``
and returns a new list consisting of only the entries that this client
should be able to apply.
There is no guarantee we'll be able to apply all returned entries because
the metadata we use to filter on may be missing or wrong.
"""
newentries = []
for entry in entries:
spec = entry.get(b'BUNDLESPEC')
if spec:
try:
bundlespec = parsebundlespec(repo, spec, strict=True)
# If a stream clone was requested, filter out non-streamclone
# entries.
if streamclonerequested and not isstreamclonespec(bundlespec):
repo.ui.debug(
b'filtering %s because not a stream clone\n'
% entry[b'URL']
)
continue
except error.InvalidBundleSpecification as e:
repo.ui.debug(stringutil.forcebytestr(e) + b'\n')
continue
except error.UnsupportedBundleSpecification as e:
repo.ui.debug(
b'filtering %s because unsupported bundle '
b'spec: %s\n' % (entry[b'URL'], stringutil.forcebytestr(e))
)
continue
# If we don't have a spec and requested a stream clone, we don't know
# what the entry is so don't attempt to apply it.
elif streamclonerequested:
repo.ui.debug(
b'filtering %s because cannot determine if a stream '
b'clone bundle\n' % entry[b'URL']
)
continue
if b'REQUIRESNI' in entry and not sslutil.hassni:
repo.ui.debug(
b'filtering %s because SNI not supported\n' % entry[b'URL']
)
continue
if b'REQUIREDRAM' in entry:
try:
requiredram = util.sizetoint(entry[b'REQUIREDRAM'])
except error.ParseError:
repo.ui.debug(
b'filtering %s due to a bad REQUIREDRAM attribute\n'
% entry[b'URL']
)
continue
actualram = repo.ui.estimatememory()
if actualram is not None and actualram * 0.66 < requiredram:
repo.ui.debug(
b'filtering %s as it needs more than 2/3 of system memory\n'
% entry[b'URL']
)
continue
newentries.append(entry)
return newentries
class clonebundleentry(object):
"""Represents an item in a clone bundles manifest.
This rich class is needed to support sorting since sorted() in Python 3
doesn't support ``cmp`` and our comparison is complex enough that ``key=``
won't work.
"""
def __init__(self, value, prefers):
self.value = value
self.prefers = prefers
def _cmp(self, other):
for prefkey, prefvalue in self.prefers:
avalue = self.value.get(prefkey)
bvalue = other.value.get(prefkey)
# Special case for b missing attribute and a matches exactly.
if avalue is not None and bvalue is None and avalue == prefvalue:
return -1
# Special case for a missing attribute and b matches exactly.
if bvalue is not None and avalue is None and bvalue == prefvalue:
return 1
# We can't compare unless attribute present on both.
if avalue is None or bvalue is None:
continue
# Same values should fall back to next attribute.
if avalue == bvalue:
continue
# Exact matches come first.
if avalue == prefvalue:
return -1
if bvalue == prefvalue:
return 1
# Fall back to next attribute.
continue
# If we got here we couldn't sort by attributes and prefers. Fall
# back to index order.
return 0
def __lt__(self, other):
return self._cmp(other) < 0
def __gt__(self, other):
return self._cmp(other) > 0
def __eq__(self, other):
return self._cmp(other) == 0
def __le__(self, other):
return self._cmp(other) <= 0
def __ge__(self, other):
return self._cmp(other) >= 0
def __ne__(self, other):
return self._cmp(other) != 0
def sortclonebundleentries(ui, entries):
prefers = ui.configlist(b'ui', b'clonebundleprefers')
if not prefers:
return list(entries)
def _split(p):
if b'=' not in p:
hint = _(b"each comma separated item should be key=value pairs")
raise error.Abort(
_(b"invalid ui.clonebundleprefers item: %s") % p, hint=hint
)
return p.split(b'=', 1)
prefers = [_split(p) for p in prefers]
items = sorted(clonebundleentry(v, prefers) for v in entries)
return [i.value for i in items]