Re: mercurial to git

Hi,

* Theodore Tso [07-03-15 17:04:07 -0400] wrote:

Hopefully you won't mind that I'm adding the git list back to the cc
line, since it would be useful for others to provide some feedback.

Not at all. Just wondering when others would get too bored... :)

Actually, there *is* an hg-fast-import.  It exists in the hg sources
in contrib/convert-repo, and it is being used in production to do
incremental conversion from the Linux kernel git tree to an hg tree.
So it does handle octopus merges already (it has to, the ACPI folks
are very ocotpus merge happy :-).

I know convert-repo and like it as a starting point. But it has some 
problems like not properly creating hg branches, can import only one 
branch at a time which must also be checkout out on the git side, etc.

With 'hg-fast-import' I meant something like git-fast-import where 
clients can feed in more raw data instead of preparing each commit on 
its own and comitting it.

[...]

So more practially, here are some of the things that we would need to
do, looking at hg-fast-export:

*) Change the index/marks file to map between hg SHA hash ID's instead
of the small integer ordinals.  This is useful for enabling multisite
conversion, but it is also useful for tracking tag changes in .hgtags.

The small numbers are the hg revision numbers which we'll need for 
git-fast-import. Ideally git-fast-import would allow us to use anything 
for a mark we want as long as it's unique. But I'm sure there's a cheap 
way of mapping revision to SHA1 in the hg API.

So, if anybody wants to join in writing up such a hybrid system, I'm for 
it. :)

   bye, Rocco
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