Christopher Baines <mail@cbaines.net> writes:

> I think we currently have an issue where the builder scripts for several
> download approaches are very numerous, svn-multi-download is probably
> the extreme example as that's used for the numerous texlive packages.
>
> I noticed this when wondering why bayfront is spending so much time
> substituting svn-multi-download files from data.guix.gnu.org, and it's
> probably taking up extra space in the data.guix.gnu.org database too.
>
> These commits should address the issue in svn-multi-fetch, svn-fetch,
> hg-fetch and git-fetch (although this issue doesn't affect users of
> builtin:git-download).  The main change is to pass the hash through to
> the builder as an environment variable, rather than generating a
> different builder script for each different hash.
>
> I've also restructured the code to try and avoid this problem in the
> future.  While there was a comment about the intent to not duplicate the
> builder scripts, it's too easy to miss.  By moving the builder to it's
> own procedure and moving the comment to the call site, it'll be clearer
> when a new source of variation is added.
>
>
> Christopher Baines (4):
>   svn-download: Reduce svn-multi-fetch builder duplication.
>   svn-download: Reduce svn-fetch builder duplication.
>   hg-download: Reduce builder duplication.
>   git-download: Reduce builder duplication.
>
>  guix/git-download.scm | 123 +++++++++++---------
>  guix/hg-download.scm  | 127 +++++++++++---------
>  guix/svn-download.scm | 264 +++++++++++++++++++++++-------------------
>  3 files changed, 291 insertions(+), 223 deletions(-)

I've tweaked the commit messages a little and pushed these patches to
master as 0daa72e34d7fafc927e2d476ef613c582107781d.