[Bug 5702] New: hg import --exact throws traceback

[mercurial-bugs at mercurial-scm.org]

https://bz.mercurial-scm.org/show_bug.cgi?id=5702

            Bug ID: 5702
           Summary: hg import --exact throws traceback
           Product: Mercurial
           Version: 4.3.3
          Hardware: PC
                OS: Linux
            Status: UNCONFIRMED
          Severity: bug
          Priority: wish
         Component: Mercurial
          Assignee: bugzilla at mercurial-scm.org
          Reporter: zash at zash.se
                CC: mercurial-devel at mercurial-scm.org

Created attachment 1977
  --> https://bz.mercurial-scm.org/attachment.cgi?id=1977&action=edit
patch being imported

An attempt to import a patch from an email causes this traceback:

modules$ hg import --exact ~/issue820
applying /home/zash/issue820
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
** unknown exception encountered, please report by visiting
** https://mercurial-scm.org/wiki/BugTracker
** Python 2.7.13 (default, Jan 19 2017, 14:48:08) [GCC 6.3.0 20170118]
** Mercurial Distributed SCM (version 4.3.3)
** Extensions loaded: extdiff, histedit, pager, patchbomb, purge, rebase,
relink, schemes, shelve, show, strip, transplant
Traceback (most recent call last):
  File "/usr/bin/hg", line 45, in <module>
    mercurial.dispatch.run()
  File "/usr/lib/python2.7/dist-packages/mercurial/dispatch.py", line 81, in
run
    status = (dispatch(req) or 0) & 255
  File "/usr/lib/python2.7/dist-packages/mercurial/dispatch.py", line 162, in
dispatch
    ret = _runcatch(req)
  File "/usr/lib/python2.7/dist-packages/mercurial/dispatch.py", line 302, in
_runcatch
    return _callcatch(ui, _runcatchfunc)
  File "/usr/lib/python2.7/dist-packages/mercurial/dispatch.py", line 310, in
_callcatch
    return scmutil.callcatch(ui, func)
  File "/usr/lib/python2.7/dist-packages/mercurial/scmutil.py", line 150, in
callcatch
    return func()
  File "/usr/lib/python2.7/dist-packages/mercurial/dispatch.py", line 292, in
_runcatchfunc
    return _dispatch(req)
  File "/usr/lib/python2.7/dist-packages/mercurial/dispatch.py", line 896, in
_dispatch
    cmdpats, cmdoptions)
  File "/usr/lib/python2.7/dist-packages/mercurial/dispatch.py", line 658, in
runcommand
    ret = _runcommand(ui, options, cmd, d)
  File "/usr/lib/python2.7/dist-packages/mercurial/extensions.py", line 322, in
closure
    return func(*(args + a), **kw)
  File "/usr/lib/python2.7/dist-packages/hgext/pager.py", line 69, in pagecmd
    return orig(ui, options, cmd, cmdfunc)
  File "/usr/lib/python2.7/dist-packages/mercurial/dispatch.py", line 904, in
_runcommand
    return cmdfunc()
  File "/usr/lib/python2.7/dist-packages/mercurial/dispatch.py", line 893, in
<lambda>
    d = lambda: util.checksignature(func)(ui, *args, **strcmdopt)
  File "/usr/lib/python2.7/dist-packages/mercurial/util.py", line 1077, in
check
    return func(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/mercurial/commands.py", line 3024, in
import_
    msgs, hg.clean)
  File "/usr/lib/python2.7/dist-packages/mercurial/cmdutil.py", line 1297, in
tryimportone
    elif opts.get('exact') and hex(n) != nodeid:
TypeError: b2a_hex() argument 1 must be string or buffer, not None

The repo is a clone of https://hg.prosody.im/prosody-modules/ and the patch is
attached (received over email).

Attempting to import without --excact appears as follows:

modules$ hg import ~/issue820
applying /home/zash/issue820

But the change is not applied or committed.

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