##// END OF EJS Templates
ssh: avoid reading beyond the end of stream when using compression...
ssh: avoid reading beyond the end of stream when using compression Compressed streams can be used as part of getbundle. The normal read() operation of bufferedinputpipe will try to fulfill the request exactly and can deadlock if the server sends less as it is done. At the same time, the bundle2 logic will stop reading when it believes it has gotten all parts of the bundle, which can leave behind end of stream markers as used by bzip2 and zstd. To solve this, introduce a new optional unbufferedread interface and provided it in bufferedinputpipe and doublepipe. If there is buffered data left, it will be returned, otherwise it will issue a single read request and return whatever it obtains. Reorganize the decompression handlers to try harder to read until the end of stream, especially if the requested read can already be fulfilled. Check for end of stream is messy with Python 2, none of the standard compression modules properly exposes it. At least with zstd and bzip2, decompressing will remember EOS and fail for empty input after the EOS has been seen. For zlib, the only way to detect it with Python 2 is to duplicate the decompressobj and force some additional data into it. The common handler can be further optimized, but works as PoC. Differential Revision: https://phab.mercurial-scm.org/D3937

File last commit:

r37138:a8a902d7 default
r38735:27391d74 default
Show More
p4.py
378 lines | 12.4 KiB | text/x-python | PythonLexer
# Perforce source for convert extension.
#
# Copyright 2009, Frank Kingswood <frank@kingswood-consulting.co.uk>
#
# 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 marshal
import re
from mercurial.i18n import _
from mercurial import (
error,
util,
)
from mercurial.utils import (
dateutil,
procutil,
stringutil,
)
from . import common
def loaditer(f):
"Yield the dictionary objects generated by p4"
try:
while True:
d = marshal.load(f)
if not d:
break
yield d
except EOFError:
pass
def decodefilename(filename):
"""Perforce escapes special characters @, #, *, or %
with %40, %23, %2A, or %25 respectively
>>> decodefilename(b'portable-net45%252Bnetcore45%252Bwp8%252BMonoAndroid')
'portable-net45%2Bnetcore45%2Bwp8%2BMonoAndroid'
>>> decodefilename(b'//Depot/Directory/%2525/%2523/%23%40.%2A')
'//Depot/Directory/%25/%23/#@.*'
"""
replacements = [('%2A', '*'), ('%23', '#'), ('%40', '@'), ('%25', '%')]
for k, v in replacements:
filename = filename.replace(k, v)
return filename
class p4_source(common.converter_source):
def __init__(self, ui, repotype, path, revs=None):
# avoid import cycle
from . import convcmd
super(p4_source, self).__init__(ui, repotype, path, revs=revs)
if "/" in path and not path.startswith('//'):
raise common.NoRepo(_('%s does not look like a P4 repository') %
path)
common.checktool('p4', abort=False)
self.revmap = {}
self.encoding = self.ui.config('convert', 'p4.encoding',
convcmd.orig_encoding)
self.re_type = re.compile(
"([a-z]+)?(text|binary|symlink|apple|resource|unicode|utf\d+)"
"(\+\w+)?$")
self.re_keywords = re.compile(
r"\$(Id|Header|Date|DateTime|Change|File|Revision|Author)"
r":[^$\n]*\$")
self.re_keywords_old = re.compile("\$(Id|Header):[^$\n]*\$")
if revs and len(revs) > 1:
raise error.Abort(_("p4 source does not support specifying "
"multiple revisions"))
def setrevmap(self, revmap):
"""Sets the parsed revmap dictionary.
Revmap stores mappings from a source revision to a target revision.
It is set in convertcmd.convert and provided by the user as a file
on the commandline.
Revisions in the map are considered beeing present in the
repository and ignored during _parse(). This allows for incremental
imports if a revmap is provided.
"""
self.revmap = revmap
def _parse_view(self, path):
"Read changes affecting the path"
cmd = 'p4 -G changes -s submitted %s' % procutil.shellquote(path)
stdout = procutil.popen(cmd, mode='rb')
p4changes = {}
for d in loaditer(stdout):
c = d.get("change", None)
if c:
p4changes[c] = True
return p4changes
def _parse(self, ui, path):
"Prepare list of P4 filenames and revisions to import"
p4changes = {}
changeset = {}
files_map = {}
copies_map = {}
localname = {}
depotname = {}
heads = []
ui.status(_('reading p4 views\n'))
# read client spec or view
if "/" in path:
p4changes.update(self._parse_view(path))
if path.startswith("//") and path.endswith("/..."):
views = {path[:-3]:""}
else:
views = {"//": ""}
else:
cmd = 'p4 -G client -o %s' % procutil.shellquote(path)
clientspec = marshal.load(procutil.popen(cmd, mode='rb'))
views = {}
for client in clientspec:
if client.startswith("View"):
sview, cview = clientspec[client].split()
p4changes.update(self._parse_view(sview))
if sview.endswith("...") and cview.endswith("..."):
sview = sview[:-3]
cview = cview[:-3]
cview = cview[2:]
cview = cview[cview.find("/") + 1:]
views[sview] = cview
# list of changes that affect our source files
p4changes = p4changes.keys()
p4changes.sort(key=int)
# list with depot pathnames, longest first
vieworder = views.keys()
vieworder.sort(key=len, reverse=True)
# handle revision limiting
startrev = self.ui.config('convert', 'p4.startrev')
# now read the full changelists to get the list of file revisions
ui.status(_('collecting p4 changelists\n'))
lastid = None
for change in p4changes:
if startrev and int(change) < int(startrev):
continue
if self.revs and int(change) > int(self.revs[0]):
continue
if change in self.revmap:
# Ignore already present revisions, but set the parent pointer.
lastid = change
continue
if lastid:
parents = [lastid]
else:
parents = []
d = self._fetch_revision(change)
c = self._construct_commit(d, parents)
descarr = c.desc.splitlines(True)
if len(descarr) > 0:
shortdesc = descarr[0].rstrip('\r\n')
else:
shortdesc = '**empty changelist description**'
t = '%s %s' % (c.rev, repr(shortdesc)[1:-1])
ui.status(stringutil.ellipsis(t, 80) + '\n')
files = []
copies = {}
copiedfiles = []
i = 0
while ("depotFile%d" % i) in d and ("rev%d" % i) in d:
oldname = d["depotFile%d" % i]
filename = None
for v in vieworder:
if oldname.lower().startswith(v.lower()):
filename = decodefilename(views[v] + oldname[len(v):])
break
if filename:
files.append((filename, d["rev%d" % i]))
depotname[filename] = oldname
if (d.get("action%d" % i) == "move/add"):
copiedfiles.append(filename)
localname[oldname] = filename
i += 1
# Collect information about copied files
for filename in copiedfiles:
oldname = depotname[filename]
flcmd = 'p4 -G filelog %s' \
% procutil.shellquote(oldname)
flstdout = procutil.popen(flcmd, mode='rb')
copiedfilename = None
for d in loaditer(flstdout):
copiedoldname = None
i = 0
while ("change%d" % i) in d:
if (d["change%d" % i] == change and
d["action%d" % i] == "move/add"):
j = 0
while ("file%d,%d" % (i, j)) in d:
if d["how%d,%d" % (i, j)] == "moved from":
copiedoldname = d["file%d,%d" % (i, j)]
break
j += 1
i += 1
if copiedoldname and copiedoldname in localname:
copiedfilename = localname[copiedoldname]
break
if copiedfilename:
copies[filename] = copiedfilename
else:
ui.warn(_("cannot find source for copied file: %s@%s\n")
% (filename, change))
changeset[change] = c
files_map[change] = files
copies_map[change] = copies
lastid = change
if lastid and len(changeset) > 0:
heads = [lastid]
return {
'changeset': changeset,
'files': files_map,
'copies': copies_map,
'heads': heads,
'depotname': depotname,
}
@util.propertycache
def _parse_once(self):
return self._parse(self.ui, self.path)
@util.propertycache
def copies(self):
return self._parse_once['copies']
@util.propertycache
def files(self):
return self._parse_once['files']
@util.propertycache
def changeset(self):
return self._parse_once['changeset']
@util.propertycache
def heads(self):
return self._parse_once['heads']
@util.propertycache
def depotname(self):
return self._parse_once['depotname']
def getheads(self):
return self.heads
def getfile(self, name, rev):
cmd = 'p4 -G print %s' \
% procutil.shellquote("%s#%s" % (self.depotname[name], rev))
lasterror = None
while True:
stdout = procutil.popen(cmd, mode='rb')
mode = None
contents = []
keywords = None
for d in loaditer(stdout):
code = d["code"]
data = d.get("data")
if code == "error":
# if this is the first time error happened
# re-attempt getting the file
if not lasterror:
lasterror = IOError(d["generic"], data)
# this will exit inner-most for-loop
break
else:
raise lasterror
elif code == "stat":
action = d.get("action")
if action in ["purge", "delete", "move/delete"]:
return None, None
p4type = self.re_type.match(d["type"])
if p4type:
mode = ""
flags = ((p4type.group(1) or "")
+ (p4type.group(3) or ""))
if "x" in flags:
mode = "x"
if p4type.group(2) == "symlink":
mode = "l"
if "ko" in flags:
keywords = self.re_keywords_old
elif "k" in flags:
keywords = self.re_keywords
elif code == "text" or code == "binary":
contents.append(data)
lasterror = None
if not lasterror:
break
if mode is None:
return None, None
contents = ''.join(contents)
if keywords:
contents = keywords.sub("$\\1$", contents)
if mode == "l" and contents.endswith("\n"):
contents = contents[:-1]
return contents, mode
def getchanges(self, rev, full):
if full:
raise error.Abort(_("convert from p4 does not support --full"))
return self.files[rev], self.copies[rev], set()
def _construct_commit(self, obj, parents=None):
"""
Constructs a common.commit object from an unmarshalled
`p4 describe` output
"""
desc = self.recode(obj.get("desc", ""))
date = (int(obj["time"]), 0) # timezone not set
if parents is None:
parents = []
return common.commit(author=self.recode(obj["user"]),
date=dateutil.datestr(date, '%Y-%m-%d %H:%M:%S %1%2'),
parents=parents, desc=desc, branch=None, rev=obj['change'],
extra={"p4": obj['change'], "convert_revision": obj['change']})
def _fetch_revision(self, rev):
"""Return an output of `p4 describe` including author, commit date as
a dictionary."""
cmd = "p4 -G describe -s %s" % rev
stdout = procutil.popen(cmd, mode='rb')
return marshal.load(stdout)
def getcommit(self, rev):
if rev in self.changeset:
return self.changeset[rev]
elif rev in self.revmap:
d = self._fetch_revision(rev)
return self._construct_commit(d, parents=None)
raise error.Abort(
_("cannot find %s in the revmap or parsed changesets") % rev)
def gettags(self):
return {}
def getchangedfiles(self, rev, i):
return sorted([x[0] for x in self.files[rev]])