$ hg init 1

  $ echo '[ui]' >> 1/.hg/hgrc

  $ echo 'timeout = 10' >> 1/.hg/hgrc

  $ echo foo > 1/foo

  $ hg --cwd 1 ci -A -m foo

  adding foo

  $ hg clone 1 2

  updating to branch default

  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

  $ hg clone 2 3

  updating to branch default

  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

  $ echo '[hooks]' >> 2/.hg/hgrc

  $ echo 'pretxnchangegroup.a = hg debuglocks; true' >> 2/.hg/hgrc

  $ echo 'changegroup.push = hg push -qf ../1' >> 2/.hg/hgrc

  $ echo bar >> 3/foo

  $ hg --cwd 3 ci -m bar

  $ hg --cwd 3 push ../2

  pushing to ../2

  searching for changes

  adding changesets

  adding manifests

  adding file changes

  added 1 changesets with 1 changes to 1 files

  lock:  user *, process * (*s) (glob)

  wlock: free