[Bug 6167] New: ZeroDivisionError with debugrevlog

[mercurial-bugs at mercurial-scm.org]

https://bz.mercurial-scm.org/show_bug.cgi?id=6167

            Bug ID: 6167
           Summary: ZeroDivisionError with debugrevlog
           Product: Mercurial
           Version: stable branch
          Hardware: PC
                OS: Linux
            Status: UNCONFIRMED
          Severity: feature
          Priority: wish
         Component: Mercurial
          Assignee: bugzilla at mercurial-scm.org
          Reporter: mh+hg at glandium.org
                CC: mercurial-devel at mercurial-scm.org

STR:
- hg clone --stream https://hg.mozilla.org/mozilla-unified
- cd mozilla-unified
- hg debugrevlog testing/mozmill/virtualenv/virtualenv_support/__init__.py
** unknown exception encountered, please report by visiting
** https://mercurial-scm.org/wiki/BugTracker
** Python 2.7.15+ (default, Nov 27 2018, 23:36:35) [GCC 7.3.0]
** Mercurial Distributed SCM (version 5.0.1)
** Extensions loaded: 
Traceback (most recent call last):
  File "/usr/local/bin/hg", line 43, in <module>
    dispatch.run()
  File "/usr/local/lib/python2.7/dist-packages/mercurial/dispatch.py", line 99,
in run
    status = dispatch(req)
  File "/usr/local/lib/python2.7/dist-packages/mercurial/dispatch.py", line
225, in dispatch
    ret = _runcatch(req) or 0
  File "/usr/local/lib/python2.7/dist-packages/mercurial/dispatch.py", line
376, in _runcatch
    return _callcatch(ui, _runcatchfunc)
  File "/usr/local/lib/python2.7/dist-packages/mercurial/dispatch.py", line
384, in _callcatch
    return scmutil.callcatch(ui, func)
  File "/usr/local/lib/python2.7/dist-packages/mercurial/scmutil.py", line 167,
in callcatch
    return func()
  File "/usr/local/lib/python2.7/dist-packages/mercurial/dispatch.py", line
367, in _runcatchfunc
    return _dispatch(req)
  File "/usr/local/lib/python2.7/dist-packages/mercurial/dispatch.py", line
1021, in _dispatch
    cmdpats, cmdoptions)
  File "/usr/local/lib/python2.7/dist-packages/mercurial/dispatch.py", line
756, in runcommand
    ret = _runcommand(ui, options, cmd, d)
  File "/usr/local/lib/python2.7/dist-packages/mercurial/dispatch.py", line
1030, in _runcommand
    return cmdfunc()
  File "/usr/local/lib/python2.7/dist-packages/mercurial/dispatch.py", line
1018, in <lambda>
    d = lambda: util.checksignature(func)(ui, *args, **strcmdopt)
  File "/usr/local/lib/python2.7/dist-packages/mercurial/util.py", line 1680,
in check
    return func(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/mercurial/debugcommands.py",
line 2277, in debugrevlog
    fullsize[2] /= numfull
ZeroDivisionError: integer division or modulo by zero

Presumably, this is happening because the file was empty when it existed.

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