Re: Adjust revision in new repository

On Fri, Sep 1, 2023 at 2:47 PM Magnus Lyrberg
<[email protected]> wrote:
>
> On Fri, Sep 1, 2023 at 2:05 PM Yasuhito FUTATSUKI
> <[email protected]> wrote:
> >
> > Although it makes a bunch of dummy empty commit, a dump file contains
> > empty revisions can increase youngest revision number keeping content
> > of the tree empty.
> >
> > e.g. A shell script to make a repositoy contains
> > 10 empty revisions:
> > [[[
> > #!/bin/sh
> >
> > repos_uuid='c68ffc52-e6c1-4053-9b3b-6e67a0e223f2'
> > rev0_date='2023-09-01T10:22:50.036256Z' # This should be just 27 letters.
> > number_of_commits=10
> >
> > produce_dump()
> > {
> > cat <<DUMP_HEAD_END
> > SVN-fs-dump-format-version: 2
> >
> > UUID: ${repos_uuid}
> >
> > Revision-number: 0
> > Prop-content-length: 56
> > Content-length: 56
> >
> > K 8
> > svn:date
> > V 27
> > ${rev0_date}
> > PROPS-END
> >
> > DUMP_HEAD_END
> >
> > rev=0
> > while [ $rev -lt $1 ]; do
> > rev=$(($rev+1))
> > cat <<REV_END
> > Revision-number: $rev
> > Prop-content-length: 10
> > Content-length: 10
> >
> > PROPS-END
> >
> > REV_END
> > done
> > }
> >
> > svnadmin create new_repo
> > produce_dump "${number_of_commits}" | svnadmin load -q new_repo
> > svnadmin info new_repo
> > ]]]
>
> Thank you. This is very similar to our current solution. It would
> however be nice to avoid a lot of empty commits, hence my
> engagement in this list asking for alternative solutions.
>
> But perhaps there are none.

I'm not sure, but it sounds like that would be quite a hack, and I
don't think it will be possible.

The repository still has to give a sane reply if a user asks for "svn
update -r 2" or "svn ls https://server/svn@1". If those revisions
really don't exist, what should the server answer? So I don't think
you can avoid creating those revisions, but you can leave them empty,
as suggested.

What is the problem in having those empty revisions anyway? I assume
they hardly take up any diskspace. If that's the only price you have
to pay for having this "old cruft removed but still original
rev-numbers repository", it sounds like a good deal to me (and it's
still a correctly working repository that behaves as designed).

-- 
Johan