But if I ask Fossil to remove all unknown files via clean --all, it will remove its own database that the current checkout was taken from. For example:

  mkdir test1
  cd test1
  fossil new myrepos
  fossil open myrepos
  fossil add ...
  fossil commit
  :
  :
  fossil clean --all

I would expect, that -- at least -- every repository, that the current checkout was taken from, should be considered as a known file and should not be subject to 'clean'. Perhaps -- as a kind of loyality -- fossil should overlook all fossil repository db it ever encounter during its traversal?

drh added on 2008-07-23 13:03:24:
Since fossil repository files have no naming conventions, it is not clear how fossil could avoid "cleaning" other repositories without opening and checking each file prior to cleaning it - which would be expensive. But I have added the feature that the current repository is not "cleaned". Nor does the current repository appear in the list of "extra" files.