IndexError: list index out of range

[0-wiz-0]

I tried this for converting a couple private repositories, and many worked fine.
But for a couple otherwise unremarkable ones, I get:

Traceback (most recent call last):
  File ".../fast-export/hg-fast-export.py", line 739, in <module>
    sys.exit(hg2git(options.repourl,m,options.marksfile,options.mappingfile,
             ~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                    options.headsfile, options.statusfile,
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    ...<5 lines>...
                    first_commit_hash=options.first_commit_hash,
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                    plugins=plugins_dict))
                    ^^^^^^^^^^^^^^^^^^^^^
  File ".../fast-export/hg-fast-export.py", line 556, in hg2git
    if not verify_heads(ui,repo,heads_cache,force,ignore_unnamed_heads,branchesmap):
           ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File ".../fast-export/hg-fast-export.py", line 494, in verify_heads
    branches[bn] = branchtip(repo, heads)
                   ~~~~~~~~~^^^^^^^^^^^^^
  File ".../fast-export/hg-fast-export.py", line 482, in branchtip
    tip = heads[-1]
          ~~~~~^^^^
IndexError: list index out of range
fast-import statistics:
---------------------------------------------------------------------
Alloc'd objects:       5000
Total objects:            0 (         0 duplicates                  )
      blobs  :            0 (         0 duplicates          0 deltas of          0 attempts)
      trees  :            0 (         0 duplicates          0 deltas of          0 attempts)
      commits:            0 (         0 duplicates          0 deltas of          0 attempts)
      tags   :            0 (         0 duplicates          0 deltas of          0 attempts)
Total branches:           0 (         0 loads     )
      marks:           1024 (         0 unique    )
      atoms:              0
Memory total:          2399 KiB
       pools:          2048 KiB
     objects:           351 KiB
---------------------------------------------------------------------
pack_report: getpagesize()            =       4096
pack_report: core.packedGitWindowSize =          0
pack_report: core.packedGitLimit      =          0
pack_report: pack_used_ctr            =          0
pack_report: pack_mmap_calls          =          0
pack_report: pack_open_windows        =          0 /          0
pack_report: pack_mapped              =          0 /          0
---------------------------------------------------------------------

The particular repository has one open branch ('master') and two closed ones. The open branch has the newest commit.

[0-wiz-0]

#350 fixes this for me.

[frej]

Do any of the troublesome repos contain closed heads? If so, the "fix" in #350 throws away information, see.

[0-wiz-0]

Yes, mine do.
What gets lost?

[frej]

Yes, mine do.

I suspected that.

What gets lost?

You lose the complete closed branch. I have committed the fix from #353, please give it a try and report if it works,

[0-wiz-0]

I've tried git head on one of the failing ones (sorry, could be a different one than the first time) and I see:

fast-export/hg-fast-export.sh -r ../path.hg -M main
Error: repository has an unnamed head: hg r833
fast-import statistics:
---------------------------------------------------------------------
Alloc'd objects:       5000
Total objects:            0 (         0 duplicates                  )
      blobs  :            0 (         0 duplicates          0 deltas of          0 attempts)
      trees  :            0 (         0 duplicates          0 deltas of          0 attempts)
      commits:            0 (         0 duplicates          0 deltas of          0 attempts)
      tags   :            0 (         0 duplicates          0 deltas of          0 attempts)
Total branches:           0 (         0 loads     )
      marks:           1024 (         0 unique    )
      atoms:              0
Memory total:          2399 KiB
       pools:          2048 KiB
     objects:           351 KiB
---------------------------------------------------------------------
pack_report: getpagesize()            =       4096
pack_report: core.packedGitWindowSize =          0
pack_report: core.packedGitLimit      =          0
pack_report: pack_used_ctr            =          0
pack_report: pack_mmap_calls          =          0
pack_report: pack_open_windows        =          0 /          0
pack_report: pack_mapped              =          0 /          0
---------------------------------------------------------------------

Commit 833 is a head-close commit.

changeset:   833:a698f28bbf77
branch:      HEAD
parent:      831:f794c8a8a2da
user:        Thomas Klausner <me>
date:        Thu May 05 15:46:45 2011 +0200
summary:     close HEAD, use default.

hg branches doesn't list that head any longer, except when I use -c.
I'm still using mercurial 7.1.2 in case it matters, but I'll update soon.

[frej]

fast-export/hg-fast-export.sh -r ../path.hg -M main
Error: repository has an unnamed head: hg r833

Please see the Notes/Limitations section of the README, this is due to an impedance mismatch between Git and Mercurial.

[edit] Note that the changes in #353 just restores the behaviour of fast-export prior to the adaptations to Mercurial 7.2 brought in by #348, so you would have got the same error with 7.1.2 if you ran with a fast-export commit prior to the merging of #348.

[0-wiz-0]

Closing branches and merging them was fine enough in my case, thanks for the help.