git-svn: SVK merge commits can have >2 parents

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  Heya,

While converting a mildly complicated svn repository that was managed
with SVK, I ran across the following oddness.  `svk smerge` can only
merge between _two_ branches at once -- however, the way that svk
merge detection works, you can end up with erroneous extra parents
from long-dead branches.  Case in point:

    export SVKROOT=/tmp/svk-testing-$$
    svk mkdir //trunk -m 'trunk'
    svk mkdir //branches -m 'branches'
    svk co //trunk
    svk cp //trunk/ //branches/feature1 -m 'branch for feature1'
    svk cp //trunk/ //branches/feature2 -m 'branch for feature2'
    svk co //branches/feature1
    cd feature1
    echo "foo" >foo
    svk add foo
    svk ci -m 'feature1 development'
    svk sm //branches/feature1 //trunk -m 'merge feature1 to trunk'
    cd ..
    svk co //branches/feature2
    cd feature2
    echo "bar" >bar
    svk add bar
    svk ci -m 'feature2 development'
    svk sm //trunk //branches/feature2 -m 'merge from trunk'
    cd ..

    git svn clone -s file://$SVKROOT/local

The 'feature2' branch will appear to have three parents: r7, r6, _and_
r5.  The r5 parent is extraneous, and only appears because r5 was
previously merged into trunk, as part of r6.

Given this, I'm a little confused why find_extra_svk_parents is
written the way that it is, in seemingly allowing multiple extra
parents to be found.  Since the most recent (i.e., highest-numbered)
change is by definition the only one that can account for all of the
other svk:merge changes, I _believe_ the attached diff to be correct,
but I'm unsure because of the implicit current assumption that smerges
can produce multiple parents.

 - Alex
-- 
Networking -- only one letter away from not working

Attachment: 0001-git-svn-svk-merge-commits-should-only-add-one-exta-p.patch
Description: Binary data


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