What does a mercurial revision with no parent mean?

Posted by Wilka on Stack Overflow See other posts from Stack Overflow or by Wilka
Published on 2010-05-19T09:58:30Z Indexed on 2010/05/19 10:00 UTC
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mercurial

I have a Mercurial repository that is in a strange state now. This is what it looks like in TortoiseHG:

Hg graph

I didn't think this would be possible. Revision 54 has a parent of "-1 (000000000000)" (i.e. nothing). There's clearly something I don't understand yet about Mercurial, can anyone let me know what this means - and what must have happened for it to get into this state. As far as I know, it's only had stuff pushed and pulled from it - and nobody has been using any wacky extensions.

Revisions 54 and 55 were just adding tags, but if I 'update -C' to revision 54 I end up with ONLY the .hgtags file.

I've made a clone from revision 53 to fix this. But I'd rather understand what happened here, so I can avoid it happening again.

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