mercurial/httprepo.py

Sometimes pushing to an HTTP repo fails with a useless message.

  abort: 'https://.../.../' does not appear to be an hg repository!

Ought to produce a better diagnostics on the client. With patched 1.3.1,
observed to produce an Apache HTML error message (from cgitb) including the
vital text:

  File ".../hgwebdir.cgi", line 70, in ?
    wsgicgi.launch(application)
  File "mercurial/hgweb/wsgicgi.py", line 68, in launch
  File "mercurial/hgweb/hgwebdir_mod.py", line 91, in __call__
  File "mercurial/hgweb/hgwebdir_mod.py", line 148, in run_wsgi
  File "mercurial/hgweb/hgweb_mod.py", line 100, in run_wsgi
  File "mercurial/hgweb/protocol.py", line 156, in unbundle
  File "mercurial/localrepo.py", line 2031, in addchangegroup
  File "mercurial/revlog.py", line 1204, in addgroup
LookupError: 00manifest.i@......: unknown parent

Might also be helpful if server's hgweb_mod.run_wsgi caught unexpected errors
and returned a well-formed error response including the stack trace. The client
patch would still be useful in this case, because it would let you diagnose
issues with HTTP proxy servers and so on.

# httprepo.py - HTTP repository proxy classes for mercurial
#
# Copyright 2005, 2006 Matt Mackall <[e-mail]>
# Copyright 2006 Vadim Gelfer <[e-mail]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2, incorporated herein by reference.

from node import bin, hex, nullid
from i18n import _
import repo, changegroup, statichttprepo, error, url, util
import os, urllib, urllib2, urlparse, zlib, httplib
import errno, socket

def zgenerator(f):
    zd = zlib.decompressobj()
    try:
        for chunk in util.filechunkiter(f):
            yield zd.decompress(chunk)
    except httplib.HTTPException:
        raise IOError(None, _('connection ended unexpectedly'))
    yield zd.flush()

class httprepository(repo.repository):
    def __init__(self, ui, path):
        self.path = path
        self.caps = None
        self.handler = None
        scheme, netloc, urlpath, query, frag = urlparse.urlsplit(path)
        if query or frag:
            raise util.Abort(_('unsupported URL component: "%s"') %
                             (query or frag))

        # urllib cannot handle URLs with embedded user or passwd
        self._url, authinfo = url.getauthinfo(path)

        self.ui = ui
        self.ui.debug('using %s\n' % self._url)

        self.urlopener = url.opener(ui, authinfo)

    def __del__(self):
        for h in self.urlopener.handlers:
            h.close()
            if hasattr(h, "close_all"):
                h.close_all()

    def url(self):
        return self.path

    # look up capabilities only when needed

    def get_caps(self):
        if self.caps is None:
            try:
                self.caps = set(self.do_read('capabilities').split())
            except error.RepoError:
                self.caps = set()
            self.ui.debug('capabilities: %s\n' %
                          (' '.join(self.caps or ['none'])))
        return self.caps

    capabilities = property(get_caps)

    def lock(self):
        raise util.Abort(_('operation not supported over http'))

    def do_cmd(self, cmd, **args):
        data = args.pop('data', None)
        headers = args.pop('headers', {})
        self.ui.debug("sending %s command\n" % cmd)
        q = {"cmd": cmd}
        q.update(args)
        qs = '?%s' % urllib.urlencode(q)
        cu = "%s%s" % (self._url, qs)
        try:
            if data:
                self.ui.debug("sending %s bytes\n" % len(data))
            resp = self.urlopener.open(urllib2.Request(cu, data, headers))
        except urllib2.HTTPError, inst:
            if inst.code == 401:
                raise util.Abort(_('authorization failed'))
            raise
        except httplib.HTTPException, inst:
            self.ui.debug('http error while sending %s command\n' % cmd)
            self.ui.traceback()
            raise IOError(None, inst)
        except IndexError:
            # this only happens with Python 2.3, later versions raise URLError
            raise util.Abort(_('http error, possibly caused by proxy setting'))
        # record the url we got redirected to
        resp_url = resp.geturl()
        if resp_url.endswith(qs):
            resp_url = resp_url[:-len(qs)]
        if self._url != resp_url:
            self.ui.status(_('real URL is %s\n') % resp_url)
            self._url = resp_url
        try:
            proto = resp.getheader('content-type')
        except AttributeError:
            proto = resp.headers['content-type']

        safeurl = url.hidepassword(self._url)
        # accept old "text/plain" and "application/hg-changegroup" for now
        if not (proto.startswith('application/mercurial-') or
                proto.startswith('text/plain') or
                proto.startswith('application/hg-changegroup')):
            self.ui.debug("requested URL: '%s'\n" % url.hidepassword(cu))
            raise error.RepoError(_("'%s' does not appear to be an hg repository:\n"
                                    "---%%<--- (%s)\n%s\n---%%<---\n")
                                  % (safeurl, proto, resp.read()))

        if proto.startswith('application/mercurial-'):
            try:
                version = proto.split('-', 1)[1]
                version_info = tuple([int(n) for n in version.split('.')])
            except ValueError:
                raise error.RepoError(_("'%s' sent a broken Content-Type "
                                        "header (%s)") % (safeurl, proto))
            if version_info > (0, 1):
                raise error.RepoError(_("'%s' uses newer protocol %s") %
                                      (safeurl, version))

        return resp

    def do_read(self, cmd, **args):
        fp = self.do_cmd(cmd, **args)
        try:
            return fp.read()
        finally:
            # if using keepalive, allow connection to be reused
            fp.close()

    def lookup(self, key):
        self.requirecap('lookup', _('look up remote revision'))
        d = self.do_cmd("lookup", key = key).read()
        success, data = d[:-1].split(' ', 1)
        if int(success):
            return bin(data)
        raise error.RepoError(data)

    def heads(self):
        d = self.do_read("heads")
        try:
            return map(bin, d[:-1].split(" "))
        except:
            raise error.ResponseError(_("unexpected response:"), d)

    def branchmap(self):
        d = self.do_read("branchmap")
        try:
            branchmap = {}
            for branchpart in d.splitlines():
                branchheads = branchpart.split(' ')
                branchname = urllib.unquote(branchheads[0])
                branchheads = [bin(x) for x in branchheads[1:]]
                branchmap[branchname] = branchheads
            return branchmap
        except:
            raise error.ResponseError(_("unexpected response:"), d)

    def branches(self, nodes):
        n = " ".join(map(hex, nodes))
        d = self.do_read("branches", nodes=n)
        try:
            br = [ tuple(map(bin, b.split(" "))) for b in d.splitlines() ]
            return br
        except:
            raise error.ResponseError(_("unexpected response:"), d)

    def between(self, pairs):
        batch = 8 # avoid giant requests
        r = []
        for i in xrange(0, len(pairs), batch):
            n = " ".join(["-".join(map(hex, p)) for p in pairs[i:i + batch]])
            d = self.do_read("between", pairs=n)
            try:
                r += [ l and map(bin, l.split(" ")) or [] for l in d.splitlines() ]
            except:
                raise error.ResponseError(_("unexpected response:"), d)
        return r

    def changegroup(self, nodes, kind):
        n = " ".join(map(hex, nodes))
        f = self.do_cmd("changegroup", roots=n)
        return util.chunkbuffer(zgenerator(f))

    def changegroupsubset(self, bases, heads, source):
        self.requirecap('changegroupsubset', _('look up remote changes'))
        baselst = " ".join([hex(n) for n in bases])
        headlst = " ".join([hex(n) for n in heads])
        f = self.do_cmd("changegroupsubset", bases=baselst, heads=headlst)
        return util.chunkbuffer(zgenerator(f))

    def unbundle(self, cg, heads, source):
        # have to stream bundle to a temp file because we do not have
        # http 1.1 chunked transfer.

        type = ""
        types = self.capable('unbundle')
        # servers older than d1b16a746db6 will send 'unbundle' as a
        # boolean capability
        try:
            types = types.split(',')
        except AttributeError:
            types = [""]
        if types:
            for x in types:
                if x in changegroup.bundletypes:
                    type = x
                    break

        tempname = changegroup.writebundle(cg, None, type)
        fp = url.httpsendfile(tempname, "rb")
        try:
            try:
                resp = self.do_read(
                     'unbundle', data=fp,
                     headers={'Content-Type': 'application/octet-stream'},
                     heads=' '.join(map(hex, heads)))
                resp_code, output = resp.split('\n', 1)
                try:
                    ret = int(resp_code)
                except ValueError, err:
                    raise error.ResponseError(
                            _('push failed (unexpected response):'), resp)
                self.ui.write(output)
                return ret
            except socket.error, err:
                if err[0] in (errno.ECONNRESET, errno.EPIPE):
                    raise util.Abort(_('push failed: %s') % err[1])
                raise util.Abort(err[1])
        finally:
            fp.close()
            os.unlink(tempname)

    def stream_out(self):
        return self.do_cmd('stream_out')

class httpsrepository(httprepository):
    def __init__(self, ui, path):
        if not url.has_https:
            raise util.Abort(_('Python support for SSL and HTTPS '
                               'is not installed'))
        httprepository.__init__(self, ui, path)

def instance(ui, path, create):
    if create:
        raise util.Abort(_('cannot create new http repository'))
    try:
        if path.startswith('https:'):
            inst = httpsrepository(ui, path)
        else:
            inst = httprepository(ui, path)
        inst.between([(nullid, nullid)])
        return inst
    except error.RepoError:
        ui.note('(falling back to static-http)\n')
        return statichttprepo.instance(ui, "static-" + path, create)