tests/test-revert-unknown.t

errors: raise InputError if an ambiguous revision id prefix is used

It's long bothered me that we include the "00changelog.i" part in a
message to the user. This fixes that along with the exit code.

Differential Revision: https://phab.mercurial-scm.org/D9600

  $ hg init
  $ touch unknown

  $ touch a
  $ hg add a
  $ hg ci -m "1"

  $ touch b
  $ hg add b
  $ hg ci -m "2"

Should show unknown

  $ hg status
  ? unknown
  $ hg revert -r 0 --all
  removing b

Should show unknown and b removed

  $ hg status
  R b
  ? unknown

Should show a and unknown

  $ ls -A
  .hg
  a
  unknown