$ cat >> $HGRCPATH << EOF
  > [extensions]
  > tweakdefaults=$TESTDIR/../hgext3rd/tweakdefaults.py
  > rebase=
  > EOF

Test histgrep and check that it respects the specified file
  $ hg init repo
  $ cd repo
  $ mkdir histgrepdir
  $ cd histgrepdir
  $ echo 'ababagalamaga' > histgrepfile1
  $ echo 'ababagalamaga' > histgrepfile2
  $ hg add histgrepfile1
  $ hg add histgrepfile2
  $ hg commit -m "Added some files"
  $ hg histgrep ababagalamaga histgrepfile1
  histgrepdir/histgrepfile1:0:ababagalamaga
  $ hg histgrep ababagalamaga
  abort: can't run histgrep on the whole repo, please provide filenames
  (this is disabled to avoid very slow greps over the whole repo)
  [255]

Check that histgrep can be explicitly allowed to search over the whole repo
  $ echo "[tweakdefaults]" >> $HGRCPATH
  $ echo "allowfullrepohistgrep=on" >> $HGRCPATH
  $ hg histgrep ababagalamaga
  histgrepdir/histgrepfile1:0:ababagalamaga
  histgrepdir/histgrepfile2:0:ababagalamaga
  $ cd ..