[Bug 4857] New: Import --exact fails with "abort: patch is damaged or loses information"

[mercurial-bugs at selenic.com]

http://bz.selenic.com/show_bug.cgi?id=4857

            Bug ID: 4857
           Summary: Import --exact fails with "abort: patch is damaged or
                    loses information"
           Product: Mercurial
           Version: default branch
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: bug
          Priority: normal
         Component: Mercurial
          Assignee: bugzilla at selenic.com
          Reporter: gregory.szorc at gmail.com
                CC: mercurial-devel at selenic.com

STR:

 $ hg clone https://hg.mozilla.org/mozilla-central
 $ cd mozilla-central
 $ hg import https://hg.mozilla.org/try/rev/c449ec4ff851 --exact --traceback

applying https://hg.mozilla.org/try/rev/c449ec4ff851
899 files updated, 0 files merged, 106 files removed, 0 files unresolved
transaction abort!
rollback completed
Traceback (most recent call last):
  File "/Users/gps/lib/python2.7/site-packages/mercurial/dispatch.py", line
187, in _runcatch
    return _dispatch(req)
  File "/Users/gps/lib/python2.7/site-packages/mercurial/dispatch.py", line
920, in _dispatch
    cmdpats, cmdoptions)
  File "/Users/gps/lib/python2.7/site-packages/mercurial/dispatch.py", line
679, in runcommand
    ret = _runcommand(ui, options, cmd, d)
  File "/Users/gps/lib/python2.7/site-packages/mercurial/dispatch.py", line
1051, in _runcommand
    return checkargs()
  File "/Users/gps/lib/python2.7/site-packages/mercurial/dispatch.py", line
1011, in checkargs
    return cmdfunc()
  File "/Users/gps/lib/python2.7/site-packages/mercurial/dispatch.py", line
917, in <lambda>
    d = lambda: util.checksignature(func)(ui, *args, **cmdoptions)
  File "/Users/gps/lib/python2.7/site-packages/mercurial/util.py", line 796, in
check
    return func(*args, **kwargs)
  File "/Users/gps/lib/python2.7/site-packages/mercurial/commands.py", line
4354, in import_
    msgs, hg.clean)
  File "/Users/gps/lib/python2.7/site-packages/mercurial/cmdutil.py", line 985,
in tryimportone
    raise util.Abort(_('patch is damaged or loses information'))
Abort: patch is damaged or loses information
abort: patch is damaged or loses information

I can reproduce this with 3.2 to @. There is a chance the changeset on the
server could be "corrupted" somehow. `hg pull -r c449ec4ff851
https://hg.mozilla.org/try` works, so I suspect something in import is busted.

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