[Kde-scm-interest] Mercurial conversion of kdelibs

[Thiago Macieira]

Apparently Mercurial comes with a nifty tool that allows us to convert from 
Git to Mercurial.

So I ran:
$ hg convert git3/KDE/kdelibs hg/kdelibs

After a while:
$ du -sh hg/kdelibs/.hg
416M    hg/kdelibs/.hg

For reference:
$ du -sh git3/KDE/kdelibs/.git
241M    git3/KDE/kdelibs/.git

However, hg seems to have a weird notion of branches:
$ hg branches
default                        74638:9cd90cab9ac2
$ hg tip -v
changeset:   74638:9cd90cab9ac2
tag:         tip
parent:      -1:000000000000
user:        nobody <nobody at localhost>
date:        Wed May 08 17:58:43 2002 +0000
description:
This commit was manufactured by cvs2svn to create tag
'ARTS_1_0_1_RELEASE'.

svn path=/tags/ARTS_1_0_1_RELEASE/kdelibs/; revision=154505

committer: nobody <nobody at localhost>

I searched hg log's output for the last commit to Subversion trunk. I got:
$ hg id -n
73049

$ hg log -r .
changeset:   73049:954ea2f61d88
user:        Fredrik Höglund <fredrik at kde.org>
date:        Thu Dec 27 20:31:03 2007 +0000
summary:     Implement support for repeat-x, repeat-y and no-repeat in 
CanvasPatternImpl.

Which matches the tip of refs/heads/master in the Git repository, including 
the broken encoding of the committer's name.

I guess that for a correct conversion, I should strip the Git repositories of 
their branches except for "master". Then that begs the question: where do 
those other branches go?

I was going to do some time comparisons on some operations, but I don't think 
we have to. We know Git is faster on Linux, but Mercurial is still fast 
enough, especially if compared to network-bound operations in Subversion. My 
worry is actually Git's performance on non-Linux systems. I found out about 
this Mercurial conversion tool because a developer here at Trolltech 
converted our repo to it since Git is too slow on MacOS X. (git status takes 
*several* seconds to run)

-- 
  Thiago Macieira  -  thiago (AT) macieira.info - thiago (AT) kde.org
    PGP/GPG: 0x6EF45358; fingerprint:
    E067 918B B660 DBD1 105C  966C 33F5 F005 6EF4 5358
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