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httppeer: detect redirect to URL without query string (issue5860)...
httppeer: detect redirect to URL without query string (issue5860) 197d10e157ce subtly changed the HTTP peer's handling of HTTP redirects. Before that changeset, we instantiated an HTTP peer instance and performed the capabilities lookup with that instance. The old code had the following relevant properties: 1) The HTTP request layer would automatically follow HTTP redirects. 2) An encountered HTTP redirect would update a peer instance variable pointing to the repo URL. 3) The peer would automagically perform a "capabilities" command request if a caller requested capabilities but capabilities were not yet defined. The first HTTP request issued by a peer is for ?cmd=capabilities. If the server responds with an HTTP redirect to a ?cmd=capabilities URL, the HTTP request layer automatically followed it, retrieved a valid capabilities response, and the peer's base URL was updated automatically so subsequent requests used the proper URL. In other words, things "just worked." In the case where the server redirected to a URL without the ?cmd=capabilities query string, the HTTP request layer would follow the redirect and likely encounter HTML. The peer's base URL would be updated and the unexpected Content-Type would raise a RepoError. We would catch RepoError and immediately call between() (testing the case for pre 0.9.1 servers not supporting the "capabilities" command). e.g. try: inst._fetchcaps() except error.RepoError: inst.between([(nullid, nullid)]) between() would eventually call into _callstream(). And _callstream() made a call to self.capable('httpheader'). capable() would call self.capabilities(), which would see that no capabilities were set (because HTML was returned for that request) and call the "capabilities" command to fetch capabilities. Because the base URL had been updated from the redirect, this 2nd "capabilities" command would succeed and the client would immediately call "between," which would also succeed. The legacy handshake succeeded. Only because "capabilities" was successfully executed as a side effect did the peer recognize that it was talking to a modern server. In other words, this all appeared to work accidentally. After 197d10e157ce, we stopped calling the "capabilities" command on the peer instance. Instead, we made the request via a low-level opener, detected the redirect as part of response handling code, and passed the redirected URL into the constructed peer instance. For cases where the redirected URL included the query string, this "just worked." But for cases where the redirected URL stripped the query string, we threw RepoError and because we removed the "between" handshake fallback, we fell through to the "is a static HTTP repo" check and performed an HTTP request for .hg/requires. While 197d10e157ce was marked as backwards incompatible, the only intended backwards incompatible behavior was not performing the "between" fallback. It was not realized that the "between" command had the side-effect of recovering from an errant redirect that dropped the query string. This commit restores the previous behavior and allows clients to handle a redirect that drops the query string. In the case where the request is redirected and the query string is dropped, we raise a special case of RepoError. We then catch this special exception in the handshake code and perform another "capabilities" request against the redirected URL. If that works, all is well. Otherwise, we fall back to the "is a static HTTP repo" check. The new code is arguably better than before 197d10e157ce, as it is explicit about the expected behavior and we avoid performing a "between" request, saving a server round trip. Differential Revision: https://phab.mercurial-scm.org/D3433

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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]])