Re: [debian-mysql] Introducing default-mysql-* metapackages
Hi Ondřej,
On Mon, Sep 05, 2016 at 08:57:57AM +0200, Ondřej Surý wrote:
> could you elaborate a bit more why you are forcing all Build-RDeps to
> change B-D to default-libmysqlclient-dev instead of just changing the
> semantics of libmysqlclient-dev?
MySQL ships the soname libmysqlclient.so.20 (in experimental currently,
18 in unstable and testing) and continues to be maintained in Debian. So
the expected package names to get libmysqlclient.so.20 are
libmysqlclient20 and libmysqlclient-dev, according to Debian policy
sections 8.1 and 8.4. libmysqlclient-dev should result in a link against
MySQL's libmysqlclient.so.
MariaDB upstream do also ship libmysqlclient.so.18 (forked from an older
MySQL), but clearly it would be insane to ship this in Debian in the
same way because of the soname conflict. I understand why MariaDB
upstream have done it this way, but their expected use case is that a
user would pick MariaDB and drop everything MySQL. Since we're not doing
that in Debian, this cannot work. So instaed, it makes sense for us to
ship separate sonames, so we are patching MariaDB to build
libmariadbclient.so.18 instead.
Having a package build depend on libmysqlclient-dev, link with
"-lmysqlclient" and then up with with a binary dependency on
libmariadbclient.so.18 would be wrong, IMHO.
That's why I want to leave libmysqlclient-dev alone, and why we're
moving this necessary insanity to libmariadbclient-dev-compat instead.
Then it's clear.
We then have the need for a "default" package, libmysqlclient-dev is
already taken, and default-libmysqlclient-dev follows the same pattern
as the others. It is perhaps a little confusing because as long as the
default is MariaDB, packages using it will end up with a binary
dependency on libmariadbclient.so.18 from libmariadbclient-dev instead,
but I think that all the other options we've considered are worse.
At least this way the insanity is limited to the -compat package, and by
extension the default- package, but everything else will appear as
normal.
Robie
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