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    SubjectRe: BK kernel workflow
    On Wed, Oct 27, 2004 at 10:58:03PM +0200, Roman Zippel wrote:
    > Allow me to translate that what this means, so everyone clearly knows
    > what's going on here:
    > The complete development history of the Linux kernel is now effectly
    > locked into the bk format, you can get a summary of it, but that's it.

    That's not even close to being the case.

    100% of the information is available on, diffs, comments,
    everything, all of which you can get at with a wget in a form that
    is perfect for import into another system.

    100% of the data, diffs, comments, everything, is available in a BK2CVS
    exported CVS tree. The comparison of the metadata is as follows:

    System File deltas Commits
    BK 203,999 53,274 (1)
    CVS 195,689 23,429 (2)

    In other words, the files which contain the data have 96% of the same
    information as the BK files, at the same boundaries, the same patches can
    be generated, etc. In 4% of the cases you are looking at a patch which
    was two commits in BK but one commit in CVS. In 4% of the cases only.
    96% of the time you'd get the same patch from each system.

    Every commit in CVS matches up to a commit in BK, so every commit in CVS
    represents a point in the BK history where you get identical output from
    BK and CVS.

    That's pretty darned good IMO. You could pick up with those CVS files
    and move forward and you've lost no data, no history, and only a tiny
    amount of patch boundary history.

    What you have lost is some metadata which doesn't translate into CVS and
    doesn't translate into Arch, so that's pointless. And as Andrea said,
    Arch can't handle more than 5,000 changesets, and the history exported
    is almost 5 times that.

    Maybe you weren't aware that that is the situation so you were complaining
    about something that wasn't true. Now that you are aware that you are
    getting all of the data, all of the comments, in a form which is 96%
    of the way to being identical to BK you will no longer have a complaint.

    Regardless of what you believe, Roman, I think that anyone can see that
    the statement that the development history of Linux kernel is locked
    into the BK format is not true. I can't believe anyone could look at
    the data and come to your conclusion.


    (1) To reproduce these numbers, get a BK 2.5 tree and do this:

    CSETS=`bk prs -hnd:I: ChangeSet | wc -l`
    BOTH=`bk -r prs -hnd:I: | wc -l`
    DELTAS=`expr $BOTH - $CSETS`

    (2) To reproduce these numbers, get a BK2CVS 2.5 tree and do this:

    DELTAS=`find . -name '*,v' | grep -v ChangeSet,v | xargs egrep '^head[[:space:]]+1\.[0-9]+;|^next[[:space:]]+1\.[0-9]+;' | wc -l`

    Similarly for the ChangeSet,v file to get csets.
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