hgweb.unbundle: call req.httphdr only after the last possible call to bail

mercurial/hgweb/hgweb_mod.py

@@ -1,1169 +1,1169 b''
 # hgweb/hgweb_mod.py - Web interface for a repository.
 #
 # Copyright 21 May 2005 - (c) 2005 Jake Edge <[e-mail]>
 # Copyright 2005, 2006 Matt Mackall <[e-mail]>
 #
 # This software may be used and distributed according to the terms
 # of the GNU General Public License, incorporated herein by reference.
 
 import os
 import os.path
 import mimetypes
 from mercurial.demandload import demandload
 demandload(globals(), "re zlib ConfigParser mimetools cStringIO sys tempfile")
 demandload(globals(), 'urllib bz2')
 demandload(globals(), "mercurial:mdiff,ui,hg,util,archival,streamclone,patch")
 demandload(globals(), "mercurial:revlog,templater")
 demandload(globals(), "mercurial.hgweb.common:get_mtime,staticfile,style_map")
 from mercurial.node import *
 from mercurial.i18n import gettext as _
 
 def _up(p):
     if p[0] != "/":
         p = "/" + p
     if p[-1] == "/":
         p = p[:-1]
     up = os.path.dirname(p)
     if up == "/":
         return "/"
     return up + "/"
 
 def revnavgen(pos, pagelen, limit, nodefunc):
     def seq(factor, limit=None):
         if limit:
             yield limit
             if limit >= 20 and limit <= 40:
                 yield 50
         else:
             yield 1 * factor
             yield 3 * factor
         for f in seq(factor * 10):
             yield f
 
     def nav(**map):
         l = []
         last = 0
         for f in seq(1, pagelen):
             if f < pagelen or f <= last:
                 continue
             if f > limit:
                 break
             last = f
             if pos + f < limit:
                 l.append(("+%d" % f, hex(nodefunc(pos + f).node())))
             if pos - f >= 0:
                 l.insert(0, ("-%d" % f, hex(nodefunc(pos - f).node())))
 
         try:
             yield {"label": "(0)", "node": hex(nodefunc('0').node())}
 
             for label, node in l:
                 yield {"label": label, "node": node}
 
             yield {"label": "tip", "node": "tip"}
         except hg.RepoError:
             pass
 
     return nav
 
 class hgweb(object):
     def __init__(self, repo, name=None):
         if type(repo) == type(""):
             self.repo = hg.repository(ui.ui(report_untrusted=False), repo)
         else:
             self.repo = repo
 
         self.mtime = -1
         self.reponame = name
         self.archives = 'zip', 'gz', 'bz2'
         self.stripecount = 1
         # a repo owner may set web.templates in .hg/hgrc to get any file
         # readable by the user running the CGI script
         self.templatepath = self.config("web", "templates",
                                         templater.templatepath(),
                                         untrusted=False)
 
     # The CGI scripts are often run by a user different from the repo owner.
     # Trust the settings from the .hg/hgrc files by default.
     def config(self, section, name, default=None, untrusted=True):
         return self.repo.ui.config(section, name, default,
                                    untrusted=untrusted)
 
     def configbool(self, section, name, default=False, untrusted=True):
         return self.repo.ui.configbool(section, name, default,
                                        untrusted=untrusted)
 
     def configlist(self, section, name, default=None, untrusted=True):
         return self.repo.ui.configlist(section, name, default,
                                        untrusted=untrusted)
 
     def refresh(self):
         mtime = get_mtime(self.repo.root)
         if mtime != self.mtime:
             self.mtime = mtime
             self.repo = hg.repository(self.repo.ui, self.repo.root)
             self.maxchanges = int(self.config("web", "maxchanges", 10))
             self.stripecount = int(self.config("web", "stripes", 1))
             self.maxshortchanges = int(self.config("web", "maxshortchanges", 60))
             self.maxfiles = int(self.config("web", "maxfiles", 10))
             self.allowpull = self.configbool("web", "allowpull", True)
 
     def archivelist(self, nodeid):
         allowed = self.configlist("web", "allow_archive")
         for i, spec in self.archive_specs.iteritems():
             if i in allowed or self.configbool("web", "allow" + i):
                 yield {"type" : i, "extension" : spec[2], "node" : nodeid}
 
     def listfilediffs(self, files, changeset):
         for f in files[:self.maxfiles]:
             yield self.t("filedifflink", node=hex(changeset), file=f)
         if len(files) > self.maxfiles:
             yield self.t("fileellipses")
 
     def siblings(self, siblings=[], hiderev=None, **args):
         siblings = [s for s in siblings if s.node() != nullid]
         if len(siblings) == 1 and siblings[0].rev() == hiderev:
             return
         for s in siblings:
             d = {'node': hex(s.node()), 'rev': s.rev()}
             if hasattr(s, 'path'):
                 d['file'] = s.path()
             d.update(args)
             yield d
 
     def renamelink(self, fl, node):
         r = fl.renamed(node)
         if r:
             return [dict(file=r[0], node=hex(r[1]))]
         return []
 
     def showtag(self, t1, node=nullid, **args):
         for t in self.repo.nodetags(node):
             yield self.t(t1, tag=t, **args)
 
     def diff(self, node1, node2, files):
         def filterfiles(filters, files):
             l = [x for x in files if x in filters]
 
             for t in filters:
                 if t and t[-1] != os.sep:
                     t += os.sep
                 l += [x for x in files if x.startswith(t)]
             return l
 
         parity = [0]
         def diffblock(diff, f, fn):
             yield self.t("diffblock",
                          lines=prettyprintlines(diff),
                          parity=parity[0],
                          file=f,
                          filenode=hex(fn or nullid))
             parity[0] = 1 - parity[0]
 
         def prettyprintlines(diff):
             for l in diff.splitlines(1):
                 if l.startswith('+'):
                     yield self.t("difflineplus", line=l)
                 elif l.startswith('-'):
                     yield self.t("difflineminus", line=l)
                 elif l.startswith('@'):
                     yield self.t("difflineat", line=l)
                 else:
                     yield self.t("diffline", line=l)
 
         r = self.repo
         cl = r.changelog
         mf = r.manifest
         change1 = cl.read(node1)
         change2 = cl.read(node2)
         mmap1 = mf.read(change1[0])
         mmap2 = mf.read(change2[0])
         date1 = util.datestr(change1[2])
         date2 = util.datestr(change2[2])
 
         modified, added, removed, deleted, unknown = r.status(node1, node2)[:5]
         if files:
             modified, added, removed = map(lambda x: filterfiles(files, x),
                                            (modified, added, removed))
 
         diffopts = patch.diffopts(self.repo.ui, untrusted=True)
         for f in modified:
             to = r.file(f).read(mmap1[f])
             tn = r.file(f).read(mmap2[f])
             yield diffblock(mdiff.unidiff(to, date1, tn, date2, f,
                                           opts=diffopts), f, tn)
         for f in added:
             to = None
             tn = r.file(f).read(mmap2[f])
             yield diffblock(mdiff.unidiff(to, date1, tn, date2, f,
                                           opts=diffopts), f, tn)
         for f in removed:
             to = r.file(f).read(mmap1[f])
             tn = None
             yield diffblock(mdiff.unidiff(to, date1, tn, date2, f,
                                           opts=diffopts), f, tn)
 
     def changelog(self, ctx, shortlog=False):
         def changelist(**map):
             parity = (start - end) & 1
             cl = self.repo.changelog
             l = [] # build a list in forward order for efficiency
             for i in xrange(start, end):
                 ctx = self.repo.changectx(i)
                 n = ctx.node()
 
                 l.insert(0, {"parity": parity,
                              "author": ctx.user(),
                              "parent": self.siblings(ctx.parents(), i - 1),
                              "child": self.siblings(ctx.children(), i + 1),
                              "changelogtag": self.showtag("changelogtag",n),
                              "desc": ctx.description(),
                              "date": ctx.date(),
                              "files": self.listfilediffs(ctx.files(), n),
                              "rev": i,
                              "node": hex(n)})
                 parity = 1 - parity
 
             for e in l:
                 yield e
 
         maxchanges = shortlog and self.maxshortchanges or self.maxchanges
         cl = self.repo.changelog
         count = cl.count()
         pos = ctx.rev()
         start = max(0, pos - maxchanges + 1)
         end = min(count, start + maxchanges)
         pos = end - 1
 
         changenav = revnavgen(pos, maxchanges, count, self.repo.changectx)
 
         yield self.t(shortlog and 'shortlog' or 'changelog',
                      changenav=changenav,
                      node=hex(cl.tip()),
                      rev=pos, changesets=count, entries=changelist,
                      archives=self.archivelist("tip"))
 
     def search(self, query):
 
         def changelist(**map):
             cl = self.repo.changelog
             count = 0
             qw = query.lower().split()
 
             def revgen():
                 for i in xrange(cl.count() - 1, 0, -100):
                     l = []
                     for j in xrange(max(0, i - 100), i):
                         ctx = self.repo.changectx(j)
                         l.append(ctx)
                     l.reverse()
                     for e in l:
                         yield e
 
             for ctx in revgen():
                 miss = 0
                 for q in qw:
                     if not (q in ctx.user().lower() or
                             q in ctx.description().lower() or
                             q in " ".join(ctx.files()[:20]).lower()):
                         miss = 1
                         break
                 if miss:
                     continue
 
                 count += 1
                 n = ctx.node()
 
                 yield self.t('searchentry',
                              parity=self.stripes(count),
                              author=ctx.user(),
                              parent=self.siblings(ctx.parents()),
                              child=self.siblings(ctx.children()),
                              changelogtag=self.showtag("changelogtag",n),
                              desc=ctx.description(),
                              date=ctx.date(),
                              files=self.listfilediffs(ctx.files(), n),
                              rev=ctx.rev(),
                              node=hex(n))
 
                 if count >= self.maxchanges:
                     break
 
         cl = self.repo.changelog
 
         yield self.t('search',
                      query=query,
                      node=hex(cl.tip()),
                      entries=changelist)
 
     def changeset(self, ctx):
         n = ctx.node()
         parents = ctx.parents()
         p1 = parents[0].node()
 
         files = []
         parity = 0
         for f in ctx.files():
             files.append(self.t("filenodelink",
                                 node=hex(n), file=f,
                                 parity=parity))
             parity = 1 - parity
 
         def diff(**map):
             yield self.diff(p1, n, None)
 
         yield self.t('changeset',
                      diff=diff,
                      rev=ctx.rev(),
                      node=hex(n),
                      parent=self.siblings(parents),
                      child=self.siblings(ctx.children()),
                      changesettag=self.showtag("changesettag",n),
                      author=ctx.user(),
                      desc=ctx.description(),
                      date=ctx.date(),
                      files=files,
                      archives=self.archivelist(hex(n)))
 
     def filelog(self, fctx):
         f = fctx.path()
         fl = fctx.filelog()
         count = fl.count()
         pagelen = self.maxshortchanges
         pos = fctx.filerev()
         start = max(0, pos - pagelen + 1)
         end = min(count, start + pagelen)
         pos = end - 1
 
         def entries(**map):
             l = []
             parity = (count - 1) & 1
 
             for i in xrange(start, end):
                 ctx = fctx.filectx(i)
                 n = fl.node(i)
 
                 l.insert(0, {"parity": parity,
                              "filerev": i,
                              "file": f,
                              "node": hex(ctx.node()),
                              "author": ctx.user(),
                              "date": ctx.date(),
                              "rename": self.renamelink(fl, n),
                              "parent": self.siblings(fctx.parents()),
                              "child": self.siblings(fctx.children()),
                              "desc": ctx.description()})
                 parity = 1 - parity
 
             for e in l:
                 yield e
 
         nodefunc = lambda x: fctx.filectx(fileid=x)
         nav = revnavgen(pos, pagelen, count, nodefunc)
         yield self.t("filelog", file=f, node=hex(fctx.node()), nav=nav,
                      entries=entries)
 
     def filerevision(self, fctx):
         f = fctx.path()
         text = fctx.data()
         fl = fctx.filelog()
         n = fctx.filenode()
 
         mt = mimetypes.guess_type(f)[0]
         rawtext = text
         if util.binary(text):
             mt = mt or 'application/octet-stream'
             text = "(binary:%s)" % mt
         mt = mt or 'text/plain'
 
         def lines():
             for l, t in enumerate(text.splitlines(1)):
                 yield {"line": t,
                        "linenumber": "% 6d" % (l + 1),
                        "parity": self.stripes(l)}
 
         yield self.t("filerevision",
                      file=f,
                      path=_up(f),
                      text=lines(),
                      raw=rawtext,
                      mimetype=mt,
                      rev=fctx.rev(),
                      node=hex(fctx.node()),
                      author=fctx.user(),
                      date=fctx.date(),
                      desc=fctx.description(),
                      parent=self.siblings(fctx.parents()),
                      child=self.siblings(fctx.children()),
                      rename=self.renamelink(fl, n),
                      permissions=fctx.manifest().execf(f))
 
     def fileannotate(self, fctx):
         f = fctx.path()
         n = fctx.filenode()
         fl = fctx.filelog()
 
         def annotate(**map):
             parity = 0
             last = None
             for f, l in fctx.annotate(follow=True):
                 fnode = f.filenode()
                 name = self.repo.ui.shortuser(f.user())
 
                 if last != fnode:
                     parity = 1 - parity
                     last = fnode
 
                 yield {"parity": parity,
                        "node": hex(f.node()),
                        "rev": f.rev(),
                        "author": name,
                        "file": f.path(),
                        "line": l}
 
         yield self.t("fileannotate",
                      file=f,
                      annotate=annotate,
                      path=_up(f),
                      rev=fctx.rev(),
                      node=hex(fctx.node()),
                      author=fctx.user(),
                      date=fctx.date(),
                      desc=fctx.description(),
                      rename=self.renamelink(fl, n),
                      parent=self.siblings(fctx.parents()),
                      child=self.siblings(fctx.children()),
                      permissions=fctx.manifest().execf(f))
 
     def manifest(self, ctx, path):
         mf = ctx.manifest()
         node = ctx.node()
 
         files = {}
 
         if path and path[-1] != "/":
             path += "/"
         l = len(path)
         abspath = "/" + path
 
         for f, n in mf.items():
             if f[:l] != path:
                 continue
             remain = f[l:]
             if "/" in remain:
                 short = remain[:remain.index("/") + 1] # bleah
                 files[short] = (f, None)
             else:
                 short = os.path.basename(remain)
                 files[short] = (f, n)
 
         def filelist(**map):
             parity = 0
             fl = files.keys()
             fl.sort()
             for f in fl:
                 full, fnode = files[f]
                 if not fnode:
                     continue
 
                 yield {"file": full,
                        "parity": self.stripes(parity),
                        "basename": f,
                        "size": ctx.filectx(full).size(),
                        "permissions": mf.execf(full)}
                 parity += 1
 
         def dirlist(**map):
             parity = 0
             fl = files.keys()
             fl.sort()
             for f in fl:
                 full, fnode = files[f]
                 if fnode:
                     continue
 
                 yield {"parity": self.stripes(parity),
                        "path": os.path.join(abspath, f),
                        "basename": f[:-1]}
                 parity += 1
 
         yield self.t("manifest",
                      rev=ctx.rev(),
                      node=hex(node),
                      path=abspath,
                      up=_up(abspath),
                      fentries=filelist,
                      dentries=dirlist,
                      archives=self.archivelist(hex(node)))
 
     def tags(self):
         cl = self.repo.changelog
 
         i = self.repo.tagslist()
         i.reverse()
 
         def entries(notip=False, **map):
             parity = 0
             for k, n in i:
                 if notip and k == "tip":
                     continue
                 yield {"parity": self.stripes(parity),
                        "tag": k,
                        "date": cl.read(n)[2],
                        "node": hex(n)}
                 parity += 1
 
         yield self.t("tags",
                      node=hex(self.repo.changelog.tip()),
                      entries=lambda **x: entries(False, **x),
                      entriesnotip=lambda **x: entries(True, **x))
 
     def summary(self):
         cl = self.repo.changelog
 
         i = self.repo.tagslist()
         i.reverse()
 
         def tagentries(**map):
             parity = 0
             count = 0
             for k, n in i:
                 if k == "tip": # skip tip
                     continue;
 
                 count += 1
                 if count > 10: # limit to 10 tags
                     break;
 
                 c = cl.read(n)
                 t = c[2]
 
                 yield self.t("tagentry",
                              parity = self.stripes(parity),
                              tag = k,
                              node = hex(n),
                              date = t)
                 parity += 1
 
         def heads(**map):
             parity = 0
             count = 0
 
             for node in self.repo.heads():
                 count += 1
                 if count > 10:
                     break;
 
                 ctx = self.repo.changectx(node)
 
                 yield {'parity': self.stripes(parity),
                        'branch': ctx.branch(),
                        'node': hex(node),
                        'date': ctx.date()}
                 parity += 1
 
         def changelist(**map):
             parity = 0
             cl = self.repo.changelog
             l = [] # build a list in forward order for efficiency
             for i in xrange(start, end):
                 n = cl.node(i)
                 changes = cl.read(n)
                 hn = hex(n)
                 t = changes[2]
 
                 l.insert(0, self.t(
                     'shortlogentry',
                     parity = parity,
                     author = changes[1],
                     desc = changes[4],
                     date = t,
                     rev = i,
                     node = hn))
                 parity = 1 - parity
 
             yield l
 
         count = cl.count()
         start = max(0, count - self.maxchanges)
         end = min(count, start + self.maxchanges)
 
         yield self.t("summary",
                  desc = self.config("web", "description", "unknown"),
                  owner = (self.config("ui", "username") or # preferred
                           self.config("web", "contact") or # deprecated
                           self.config("web", "author", "unknown")), # also
                  lastchange = cl.read(cl.tip())[2],
                  tags = tagentries,
                  heads = heads,
                  shortlog = changelist,
                  node = hex(cl.tip()),
                  archives=self.archivelist("tip"))
 
     def filediff(self, fctx):
         n = fctx.node()
         path = fctx.path()
         parents = fctx.parents()
         p1 = parents and parents[0].node() or nullid
 
         def diff(**map):
             yield self.diff(p1, n, [path])
 
         yield self.t("filediff",
                      file=path,
                      node=hex(n),
                      rev=fctx.rev(),
                      parent=self.siblings(parents),
                      child=self.siblings(fctx.children()),
                      diff=diff)
 
     archive_specs = {
         'bz2': ('application/x-tar', 'tbz2', '.tar.bz2', None),
         'gz': ('application/x-tar', 'tgz', '.tar.gz', None),
         'zip': ('application/zip', 'zip', '.zip', None),
         }
 
     def archive(self, req, cnode, type_):
         reponame = re.sub(r"\W+", "-", os.path.basename(self.reponame))
         name = "%s-%s" % (reponame, short(cnode))
         mimetype, artype, extension, encoding = self.archive_specs[type_]
         headers = [('Content-type', mimetype),
                    ('Content-disposition', 'attachment; filename=%s%s' %
                     (name, extension))]
         if encoding:
             headers.append(('Content-encoding', encoding))
         req.header(headers)
         archival.archive(self.repo, req.out, cnode, artype, prefix=name)
 
     # add tags to things
     # tags -> list of changesets corresponding to tags
     # find tag, changeset, file
 
     def cleanpath(self, path):
         path = path.lstrip('/')
         return util.canonpath(self.repo.root, '', path)
 
     def run(self):
         if not os.environ.get('GATEWAY_INTERFACE', '').startswith("CGI/1."):
             raise RuntimeError("This function is only intended to be called while running as a CGI script.")
         import mercurial.hgweb.wsgicgi as wsgicgi
         from request import wsgiapplication
         def make_web_app():
             return self
         wsgicgi.launch(wsgiapplication(make_web_app))
 
     def run_wsgi(self, req):
         def header(**map):
             header_file = cStringIO.StringIO(
                 ''.join(self.t("header", encoding=util._encoding, **map)))
             msg = mimetools.Message(header_file, 0)
             req.header(msg.items())
             yield header_file.read()
 
         def rawfileheader(**map):
             req.header([('Content-type', map['mimetype']),
                         ('Content-disposition', 'filename=%s' % map['file']),
                         ('Content-length', str(len(map['raw'])))])
             yield ''
 
         def footer(**map):
             yield self.t("footer", **map)
 
         def motd(**map):
             yield self.config("web", "motd", "")
 
         def expand_form(form):
             shortcuts = {
                 'cl': [('cmd', ['changelog']), ('rev', None)],
                 'sl': [('cmd', ['shortlog']), ('rev', None)],
                 'cs': [('cmd', ['changeset']), ('node', None)],
                 'f': [('cmd', ['file']), ('filenode', None)],
                 'fl': [('cmd', ['filelog']), ('filenode', None)],
                 'fd': [('cmd', ['filediff']), ('node', None)],
                 'fa': [('cmd', ['annotate']), ('filenode', None)],
                 'mf': [('cmd', ['manifest']), ('manifest', None)],
                 'ca': [('cmd', ['archive']), ('node', None)],
                 'tags': [('cmd', ['tags'])],
                 'tip': [('cmd', ['changeset']), ('node', ['tip'])],
                 'static': [('cmd', ['static']), ('file', None)]
             }
 
             for k in shortcuts.iterkeys():
                 if form.has_key(k):
                     for name, value in shortcuts[k]:
                         if value is None:
                             value = form[k]
                         form[name] = value
                     del form[k]
 
         def rewrite_request(req):
             '''translate new web interface to traditional format'''
 
             def spliturl(req):
                 def firstitem(query):
                     return query.split('&', 1)[0].split(';', 1)[0]
 
                 def normurl(url):
                     inner = '/'.join([x for x in url.split('/') if x])
                     tl = len(url) > 1 and url.endswith('/') and '/' or ''
 
                     return '%s%s%s' % (url.startswith('/') and '/' or '',
                                        inner, tl)
 
                 root = normurl(urllib.unquote(req.env.get('REQUEST_URI', '').split('?', 1)[0]))
                 pi = normurl(req.env.get('PATH_INFO', ''))
                 if pi:
                     # strip leading /
                     pi = pi[1:]
                     if pi:
                         root = root[:-len(pi)]
                     if req.env.has_key('REPO_NAME'):
                         rn = req.env['REPO_NAME'] + '/'
                         root += rn
                         query = pi[len(rn):]
                     else:
                         query = pi
                 else:
                     root += '?'
                     query = firstitem(req.env['QUERY_STRING'])
 
                 return (root, query)
 
             req.url, query = spliturl(req)
 
             if req.form.has_key('cmd'):
                 # old style
                 return
 
             args = query.split('/', 2)
             if not args or not args[0]:
                 return
 
             cmd = args.pop(0)
             style = cmd.rfind('-')
             if style != -1:
                 req.form['style'] = [cmd[:style]]
                 cmd = cmd[style+1:]
             # avoid accepting e.g. style parameter as command
             if hasattr(self, 'do_' + cmd):
                 req.form['cmd'] = [cmd]
 
             if args and args[0]:
                 node = args.pop(0)
                 req.form['node'] = [node]
             if args:
                 req.form['file'] = args
 
             if cmd == 'static':
                 req.form['file'] = req.form['node']
             elif cmd == 'archive':
                 fn = req.form['node'][0]
                 for type_, spec in self.archive_specs.iteritems():
                     ext = spec[2]
                     if fn.endswith(ext):
                         req.form['node'] = [fn[:-len(ext)]]
                         req.form['type'] = [type_]
 
         def sessionvars(**map):
             fields = []
             if req.form.has_key('style'):
                 style = req.form['style'][0]
                 if style != self.config('web', 'style', ''):
                     fields.append(('style', style))
 
             separator = req.url[-1] == '?' and ';' or '?'
             for name, value in fields:
                 yield dict(name=name, value=value, separator=separator)
                 separator = ';'
 
         self.refresh()
 
         expand_form(req.form)
         rewrite_request(req)
 
         style = self.config("web", "style", "")
         if req.form.has_key('style'):
             style = req.form['style'][0]
         mapfile = style_map(self.templatepath, style)
 
         port = req.env["SERVER_PORT"]
         port = port != "80" and (":" + port) or ""
         urlbase = 'http://%s%s' % (req.env['SERVER_NAME'], port)
 
         if not self.reponame:
             self.reponame = (self.config("web", "name")
                              or req.env.get('REPO_NAME')
                              or req.url.strip('/') or self.repo.root)
 
         self.t = templater.templater(mapfile, templater.common_filters,
                                      defaults={"url": req.url,
                                                "urlbase": urlbase,
                                                "repo": self.reponame,
                                                "header": header,
                                                "footer": footer,
                                                "motd": motd,
                                                "rawfileheader": rawfileheader,
                                                "sessionvars": sessionvars
                                                })
 
         if not req.form.has_key('cmd'):
             req.form['cmd'] = [self.t.cache['default']]
 
         cmd = req.form['cmd'][0]
 
         method = getattr(self, 'do_' + cmd, None)
         if method:
             try:
                 method(req)
             except (hg.RepoError, revlog.RevlogError), inst:
                 req.write(self.t("error", error=str(inst)))
         else:
             req.write(self.t("error", error='No such method: ' + cmd))
 
     def changectx(self, req):
         if req.form.has_key('node'):
             changeid = req.form['node'][0]
         elif req.form.has_key('manifest'):
             changeid = req.form['manifest'][0]
         else:
             changeid = self.repo.changelog.count() - 1
 
         try:
             ctx = self.repo.changectx(changeid)
         except hg.RepoError:
             man = self.repo.manifest
             mn = man.lookup(changeid)
             ctx = self.repo.changectx(man.linkrev(mn))
 
         return ctx
 
     def filectx(self, req):
         path = self.cleanpath(req.form['file'][0])
         if req.form.has_key('node'):
             changeid = req.form['node'][0]
         else:
             changeid = req.form['filenode'][0]
         try:
             ctx = self.repo.changectx(changeid)
             fctx = ctx.filectx(path)
         except hg.RepoError:
             fctx = self.repo.filectx(path, fileid=changeid)
 
         return fctx
 
     def stripes(self, parity):
         "make horizontal stripes for easier reading"
         if self.stripecount:
             return (1 + parity / self.stripecount) & 1
         else:
             return 0
 
     def do_log(self, req):
         if req.form.has_key('file') and req.form['file'][0]:
             self.do_filelog(req)
         else:
             self.do_changelog(req)
 
     def do_rev(self, req):
         self.do_changeset(req)
 
     def do_file(self, req):
         path = self.cleanpath(req.form.get('file', [''])[0])
         if path:
             try:
                 req.write(self.filerevision(self.filectx(req)))
                 return
             except hg.RepoError:
                 pass
 
         req.write(self.manifest(self.changectx(req), path))
 
     def do_diff(self, req):
         self.do_filediff(req)
 
     def do_changelog(self, req, shortlog = False):
         if req.form.has_key('node'):
             ctx = self.changectx(req)
         else:
             if req.form.has_key('rev'):
                 hi = req.form['rev'][0]
             else:
                 hi = self.repo.changelog.count() - 1
             try:
                 ctx = self.repo.changectx(hi)
             except hg.RepoError:
                 req.write(self.search(hi)) # XXX redirect to 404 page?
                 return
 
         req.write(self.changelog(ctx, shortlog = shortlog))
 
     def do_shortlog(self, req):
         self.do_changelog(req, shortlog = True)
 
     def do_changeset(self, req):
         req.write(self.changeset(self.changectx(req)))
 
     def do_manifest(self, req):
         req.write(self.manifest(self.changectx(req),
                                 self.cleanpath(req.form['path'][0])))
 
     def do_tags(self, req):
         req.write(self.tags())
 
     def do_summary(self, req):
         req.write(self.summary())
 
     def do_filediff(self, req):
         req.write(self.filediff(self.filectx(req)))
 
     def do_annotate(self, req):
         req.write(self.fileannotate(self.filectx(req)))
 
     def do_filelog(self, req):
         req.write(self.filelog(self.filectx(req)))
 
     def do_lookup(self, req):
         try:
             r = hex(self.repo.lookup(req.form['key'][0]))
             success = 1
         except Exception,inst:
             r = str(inst)
             success = 0
         resp = "%s %s\n" % (success, r)
         req.httphdr("application/mercurial-0.1", length=len(resp))
         req.write(resp)
 
     def do_heads(self, req):
         resp = " ".join(map(hex, self.repo.heads())) + "\n"
         req.httphdr("application/mercurial-0.1", length=len(resp))
         req.write(resp)
 
     def do_branches(self, req):
         nodes = []
         if req.form.has_key('nodes'):
             nodes = map(bin, req.form['nodes'][0].split(" "))
         resp = cStringIO.StringIO()
         for b in self.repo.branches(nodes):
             resp.write(" ".join(map(hex, b)) + "\n")
         resp = resp.getvalue()
         req.httphdr("application/mercurial-0.1", length=len(resp))
         req.write(resp)
 
     def do_between(self, req):
         if req.form.has_key('pairs'):
             pairs = [map(bin, p.split("-"))
                      for p in req.form['pairs'][0].split(" ")]
         resp = cStringIO.StringIO()
         for b in self.repo.between(pairs):
             resp.write(" ".join(map(hex, b)) + "\n")
         resp = resp.getvalue()
         req.httphdr("application/mercurial-0.1", length=len(resp))
         req.write(resp)
 
     def do_changegroup(self, req):
         req.httphdr("application/mercurial-0.1")
         nodes = []
         if not self.allowpull:
             return
 
         if req.form.has_key('roots'):
             nodes = map(bin, req.form['roots'][0].split(" "))
 
         z = zlib.compressobj()
         f = self.repo.changegroup(nodes, 'serve')
         while 1:
             chunk = f.read(4096)
             if not chunk:
                 break
             req.write(z.compress(chunk))
 
         req.write(z.flush())
 
     def do_changegroupsubset(self, req):
         req.httphdr("application/mercurial-0.1")
         bases = []
         heads = []
         if not self.allowpull:
             return
 
         if req.form.has_key('bases'):
             bases = [bin(x) for x in req.form['bases'][0].split(' ')]
         if req.form.has_key('heads'):
             heads = [bin(x) for x in req.form['heads'][0].split(' ')]
 
         z = zlib.compressobj()
         f = self.repo.changegroupsubset(bases, heads, 'serve')
         while 1:
             chunk = f.read(4096)
             if not chunk:
                 break
             req.write(z.compress(chunk))
 
         req.write(z.flush())
 
     def do_archive(self, req):
         changeset = self.repo.lookup(req.form['node'][0])
         type_ = req.form['type'][0]
         allowed = self.configlist("web", "allow_archive")
         if (type_ in self.archives and (type_ in allowed or
             self.configbool("web", "allow" + type_, False))):
             self.archive(req, changeset, type_)
             return
 
         req.write(self.t("error"))
 
     def do_static(self, req):
         fname = req.form['file'][0]
         # a repo owner may set web.static in .hg/hgrc to get any file
         # readable by the user running the CGI script
         static = self.config("web", "static",
                              os.path.join(self.templatepath, "static"),
                              untrusted=False)
         req.write(staticfile(static, fname, req)
                   or self.t("error", error="%r not found" % fname))
 
     def do_capabilities(self, req):
         caps = ['lookup', 'changegroupsubset']
         if self.configbool('server', 'uncompressed'):
             caps.append('stream=%d' % self.repo.revlogversion)
         # XXX: make configurable and/or share code with do_unbundle:
         unbundleversions = ['HG10GZ', 'HG10BZ', 'HG10UN']
         if unbundleversions:
             caps.append('unbundle=%s' % ','.join(unbundleversions))
         resp = ' '.join(caps)
         req.httphdr("application/mercurial-0.1", length=len(resp))
         req.write(resp)
 
     def check_perm(self, req, op, default):
         '''check permission for operation based on user auth.
         return true if op allowed, else false.
         default is policy to use if no config given.'''
 
         user = req.env.get('REMOTE_USER')
 
         deny = self.configlist('web', 'deny_' + op)
         if deny and (not user or deny == ['*'] or user in deny):
             return False
 
         allow = self.configlist('web', 'allow_' + op)
         return (allow and (allow == ['*'] or user in allow)) or default
 
     def do_unbundle(self, req):
         def bail(response, headers={}):
             length = int(req.env['CONTENT_LENGTH'])
             for s in util.filechunkiter(req, limit=length):
                 # drain incoming bundle, else client will not see
                 # response when run outside cgi script
                 pass
             req.httphdr("application/mercurial-0.1", headers=headers)
             req.write('0\n')
             req.write(response)
 
         # require ssl by default, auth info cannot be sniffed and
         # replayed
         ssl_req = self.configbool('web', 'push_ssl', True)
         if ssl_req:
             if not req.env.get('HTTPS'):
                 bail(_('ssl required\n'))
                 return
             proto = 'https'
         else:
             proto = 'http'
 
         # do not allow push unless explicitly allowed
         if not self.check_perm(req, 'push', False):
             bail(_('push not authorized\n'),
                  headers={'status': '401 Unauthorized'})
             return
 
-        req.httphdr("application/mercurial-0.1")
-
         their_heads = req.form['heads'][0].split(' ')
 
         def check_heads():
             heads = map(hex, self.repo.heads())
             return their_heads == [hex('force')] or their_heads == heads
 
         # fail early if possible
         if not check_heads():
             bail(_('unsynced changes\n'))
             return
 
+        req.httphdr("application/mercurial-0.1")
+
         # do not lock repo until all changegroup data is
         # streamed. save to temporary file.
 
         fd, tempname = tempfile.mkstemp(prefix='hg-unbundle-')
         fp = os.fdopen(fd, 'wb+')
         try:
             length = int(req.env['CONTENT_LENGTH'])
             for s in util.filechunkiter(req, limit=length):
                 fp.write(s)
 
             lock = self.repo.lock()
             try:
                 if not check_heads():
                     req.write('0\n')
                     req.write(_('unsynced changes\n'))
                     return
 
                 fp.seek(0)
                 header = fp.read(6)
                 if not header.startswith("HG"):
                     # old client with uncompressed bundle
                     def generator(f):
                         yield header
                         for chunk in f:
                             yield chunk
                 elif not header.startswith("HG10"):
                     req.write("0\n")
                     req.write(_("unknown bundle version\n"))
                     return
                 elif header == "HG10GZ":
                     def generator(f):
                         zd = zlib.decompressobj()
                         for chunk in f:
                             yield zd.decompress(chunk)
                 elif header == "HG10BZ":
                     def generator(f):
                         zd = bz2.BZ2Decompressor()
                         zd.decompress("BZ")
                         for chunk in f:
                             yield zd.decompress(chunk)
                 elif header == "HG10UN":
                     def generator(f):
                         for chunk in f:
                             yield chunk
                 else:
                     req.write("0\n")
                     req.write(_("unknown bundle compression type\n"))
                     return
                 gen = generator(util.filechunkiter(fp, 4096))
 
                 # send addchangegroup output to client
 
                 old_stdout = sys.stdout
                 sys.stdout = cStringIO.StringIO()
 
                 try:
                     url = 'remote:%s:%s' % (proto,
                                             req.env.get('REMOTE_HOST', ''))
                     try:
                         ret = self.repo.addchangegroup(util.chunkbuffer(gen),
                                                        'serve', url)
                     except util.Abort, inst:
                         sys.stdout.write("abort: %s\n" % inst)
                         ret = 0
                 finally:
                     val = sys.stdout.getvalue()
                     sys.stdout = old_stdout
                 req.write('%d\n' % ret)
                 req.write(val)
             finally:
                 lock.release()
         finally:
             fp.close()
             os.unlink(tempname)
 
     def do_stream_out(self, req):
         req.httphdr("application/mercurial-0.1")
         streamclone.stream_out(self.repo, req)