$ hg init a

  $ cd a

  $ echo foo > b

  $ hg add b

  $ hg ci -m "b"

  $ chmod -w .hg/store

  $ cd ..

  $ hg clone a b

  requesting all changes

  adding changesets

  adding manifests

  adding file changes

  added 1 changesets with 1 changes to 1 files

  updating to branch default

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

  $ chmod +w a/.hg/store # let test clean up

  $ cd b

  $ hg verify

  checking changesets

  checking manifests

  crosschecking files in changesets and manifests

  checking files

  1 files, 1 changesets, 1 total revisions