some issues with SharedRepo extension

[TK Soh]

I just tried out the SharedRepo extension (cset b13d628ca5ab), but ran
into some issue with incoming. Pulling, however, appeared to work:

    % hg clone --shared c1 c1s
    no changes found
    updating working directory
    1020 files updated, 0 files merged, 0 files removed, 0 files unresolved

    % hg -R c1s in http://hg.intevation.org/mercurial/crew
    comparing with http://hg.intevation.org/mercurial/crew
    searching for changes
    abort: 00changelog.i at b0ce2595777b: unknown parent!

    % hg -R c1 in http://hg.intevation.org/mercurial/crew
    comparing with http://hg.intevation.org/mercurial/crew
    searching for changes
    changeset:   8302:d2ad8c066676
    user:        Martin Geisler <mg at lazybytes.net>
    date:        Thu May 07 01:33:44 2009 +0200
    summary:     util: simplify pipefilter and avoid subprocess race

    changeset:   8303:db52cc4f2f97
    tag:         tip
    user:        Martin Geisler <mg at lazybytes.net>
    date:        Thu May 07 01:33:45 2009 +0200
    summary:     gpg: use reverse kwarg to sort sigs in reversed order

    % hg -R c1s pull http://hg.intevation.org/mercurial/crew
    pulling from http://hg.intevation.org/mercurial/crew
    searching for changes
    adding changesets
    adding manifests
    adding file changes
    added 2 changesets with 2 changes to 2 files
    (run 'hg update' to get a working copy)

    % hg -R c1 pull http://hg.intevation.org/mercurial/crew
    pulling from http://hg.intevation.org/mercurial/crew
    searching for changes
    no changes found

I'm using hg 1.2.1. Not sure if there's any compatibility issue. Any comment?

TK