mercurial/sshrepo.py

localrepository.status: only acquire wlock if actually needed.

This speeds up the common case of not needing to update the dirstate,
and avoids the need to reload and parse the dirstate "just in case".

# sshrepo.py - ssh repository proxy class for mercurial
#
# 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.

from node import *
from remoterepo import *
from i18n import _
import hg, os, re, stat, util

class sshrepository(remoterepository):
    def __init__(self, ui, path, create=0):
        self._url = path
        self.ui = ui

        m = re.match(r'^ssh://(([^@]+)@)?([^:/]+)(:(\d+))?(/(.*))?$', path)
        if not m:
            self.raise_(hg.RepoError(_("couldn't parse location %s") % path))

        self.user = m.group(2)
        self.host = m.group(3)
        self.port = m.group(5)
        self.path = m.group(7) or "."

        args = self.user and ("%s@%s" % (self.user, self.host)) or self.host
        args = self.port and ("%s -p %s") % (args, self.port) or args

        sshcmd = self.ui.config("ui", "ssh", "ssh")
        remotecmd = self.ui.config("ui", "remotecmd", "hg")

        if create:
            cmd = '%s %s "%s init %s"'
            cmd = cmd % (sshcmd, args, remotecmd, self.path)

            ui.note('running %s\n' % cmd)
            res = os.system(cmd)
            if res != 0:
                self.raise_(hg.RepoError(_("could not create remote repo")))

        self.validate_repo(ui, sshcmd, args, remotecmd)

    def url(self):
        return self._url

    def validate_repo(self, ui, sshcmd, args, remotecmd):
        # cleanup up previous run
        self.cleanup()

        cmd = '%s %s "%s -R %s serve --stdio"'
        cmd = cmd % (sshcmd, args, remotecmd, self.path)

        ui.note('running %s\n' % cmd)
        self.pipeo, self.pipei, self.pipee = os.popen3(cmd, 'b')

        # skip any noise generated by remote shell
        self.do_cmd("hello")
        r = self.do_cmd("between", pairs=("%s-%s" % ("0"*40, "0"*40)))
        lines = ["", "dummy"]
        max_noise = 500
        while lines[-1] and max_noise:
            l = r.readline()
            self.readerr()
            if lines[-1] == "1\n" and l == "\n":
                break
            if l:
                ui.debug(_("remote: "), l)
            lines.append(l)
            max_noise -= 1
        else:
            self.raise_(hg.RepoError(_("no suitable response from remote hg")))

        self.capabilities = ()
        lines.reverse()
        for l in lines:
            if l.startswith("capabilities:"):
                self.capabilities = l[:-1].split(":")[1].split()
                break

    def readerr(self):
        while 1:
            size = util.fstat(self.pipee).st_size
            if size == 0: break
            l = self.pipee.readline()
            if not l: break
            self.ui.status(_("remote: "), l)

    def raise_(self, exception):
        self.cleanup()
        raise exception

    def cleanup(self):
        try:
            self.pipeo.close()
            self.pipei.close()
            # read the error descriptor until EOF
            for l in self.pipee:
                self.ui.status(_("remote: "), l)
            self.pipee.close()
        except:
            pass

    __del__ = cleanup

    def do_cmd(self, cmd, **args):
        self.ui.debug(_("sending %s command\n") % cmd)
        self.pipeo.write("%s\n" % cmd)
        for k, v in args.items():
            self.pipeo.write("%s %d\n" % (k, len(v)))
            self.pipeo.write(v)
        self.pipeo.flush()

        return self.pipei

    def call(self, cmd, **args):
        r = self.do_cmd(cmd, **args)
        l = r.readline()
        self.readerr()
        try:
            l = int(l)
        except:
            self.raise_(util.UnexpectedOutput(_("unexpected response:"), l))
        return r.read(l)

    def lock(self):
        self.call("lock")
        return remotelock(self)

    def unlock(self):
        self.call("unlock")

    def lookup(self, key):
        d = self.call("lookup", key=key)
        success, data = d[:-1].split(" ", 1)
        if int(success):
            return bin(data)
        else:
            self.raise_(hg.RepoError(data))

    def heads(self):
        d = self.call("heads")
        try:
            return map(bin, d[:-1].split(" "))
        except:
            self.raise_(util.UnexpectedOutput(_("unexpected response:"), d))

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

    def between(self, pairs):
        n = "\n".join(["-".join(map(hex, p)) for p in pairs])
        d = self.call("between", pairs=n)
        try:
            p = [ l and map(bin, l.split(" ")) or [] for l in d.splitlines() ]
            return p
        except:
            self.raise_(util.UnexpectedOutput(_("unexpected response:"), d))

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

    def changegroupsubset(self, bases, heads, kind):
        bases = " ".join(map(hex, bases))
        heads = " ".join(map(hex, heads))
        return self.do_cmd("changegroupsubset", bases=bases, heads=heads)

    def unbundle(self, cg, heads, source):
        d = self.call("unbundle", heads=' '.join(map(hex, heads)))
        if d:
            self.raise_(hg.RepoError(_("push refused: %s") % d))

        while 1:
            d = cg.read(4096)
            if not d: break
            self.pipeo.write(str(len(d)) + '\n')
            self.pipeo.write(d)
            self.readerr()

        self.pipeo.write('0\n')
        self.pipeo.flush()

        self.readerr()
        d = self.pipei.readline()
        if d != '\n':
            return 1

        l = int(self.pipei.readline())
        r = self.pipei.read(l)
        if not r:
            return 1
        return int(r)

    def addchangegroup(self, cg, source, url):
        d = self.call("addchangegroup")
        if d:
            self.raise_(hg.RepoError(_("push refused: %s") % d))
        while 1:
            d = cg.read(4096)
            if not d: break
            self.pipeo.write(d)
            self.readerr()

        self.pipeo.flush()

        self.readerr()
        l = int(self.pipei.readline())
        r = self.pipei.read(l)
        if not r:
            return 1
        return int(r)

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

instance = sshrepository