tests/dummyssh

branchmap: pass changelog into branchmap functions

As part of building the branchmap, we loop over revs and call branchmap()
or _branchmap(). Previously, these functions were accessing repo.changelog.
We know from past experience that repo.changelog in loops is bad for
performance.

This commit teaches the branchmap code to pass a changelog instance into
branchmap() and _branchmap() so we don't need to pay this penalty.

On my MBP, this appears to show a speedup on a clone of the
mozilla-unified repo:

$ hg perfbranchmap --clear-revbranch
! base
! wall 21.078160 comb 21.070000 user 20.920000 sys 0.150000 (best of 3)
! wall 20.574682 comb 20.560000 user 20.400000 sys 0.160000 (best of 3)

$ hg perfbranchmap
! base
! wall 4.880413 comb 4.870000 user 4.860000 sys 0.010000 (best of 3)
! wall 4.573968 comb 4.560000 user 4.550000 sys 0.010000 (best of 3)

Differential Revision: https://phab.mercurial-scm.org/D5161

#!/usr/bin/env python

from __future__ import absolute_import

import os
import sys

os.chdir(os.getenv('TESTTMP'))

if sys.argv[1] != "user@dummy":
    sys.exit(-1)

os.environ["SSH_CLIENT"] = "%s 1 2" % os.environ.get('LOCALIP', '127.0.0.1')

log = open("dummylog", "ab")
log.write(b"Got arguments")
for i, arg in enumerate(sys.argv[1:]):
    log.write(b" %d:%s" % (i + 1, arg.encode('latin1')))
log.write(b"\n")
log.close()
hgcmd = sys.argv[2]
if os.name == 'nt':
    # hack to make simple unix single quote quoting work on windows
    hgcmd = hgcmd.replace("'", '"')
r = os.system(hgcmd)
sys.exit(bool(r))