---------- Forwarded Message ---------- Subject: IRC log of hingo and cafuego about the deb packages still named "mysql" Date: Friday 28 May 2010 From: Henrik Ingo <hingo@askmonty.org> To: maria-developers@lists.launchpad.net Archiving this here for later reference. The background is that current MariaDB packaging (which is based on ourdelta) still has a few packages called mysql-something instead of mariadb-something. This works for ourdelta, but since you obviously cannot have 2 identically named packages in the same repository, this is a showstopper for getting MariaDB into Debian. My gut feeling of the below is that this is a bug in apt. If there is one package called mysql-common (which is one of the problematic packages) and one called mariadb-common that Provides: mysql-common, then if user chooses to install mariadb-* and uninstall mysql-*, apt should be happy and let the user do that. [12:54:43] <hingo> cafuego? [12:55:24] <evil_steve> is the six foot something dutch guy in the corner nursing the fruitiest, girliest drink in the place. [12:56:20] <capitol> ^^ [13:03:57] <cafuego> hingo: yes? [13:04:16] <hingo> cafuego: You are the one doing the ourdelta deb packages? [13:04:30] <cafuego> Yup [13:08:30] <-- monk-eeee (~monk- eeee@c220-237-92-67.kelvn3.qld.optusnet.com.au) has quit (Quit: Computer has gone to sleep) [13:13:06] --> monk-eeee (~monk- eeee@c220-237-92-67.kelvn3.qld.optusnet.com.au) has joined #ourdelta [13:14:42] <hingo> Oh sorry, I drifted off... [13:15:27] <hingo> So, I was looking into some old emails and returned to the fact we ship a "mysql-common" package with MariaDB. [13:16:00] <hingo> Arjen says this is because some other debian package is "hard-coded" to depend on that, but he is never able to remember more details. Do you? [13:17:01] <hingo> Details such as 1) do you remember which packages in debian break if we rename it to mariadb-common and 2) since packages do "depends" and "provides", how is it even possible to depend on the package name so that it cannot be solved with a provides:? [13:17:11] <hingo> cafuego ^ [13:37:32] <-- monk-eeee (~monk- eeee@c220-237-92-67.kelvn3.qld.optusnet.com.au) has quit (Quit: Computer has gone to sleep) [13:43:18] <cafuego> hingo: ummm... i think it was perl-dbi or somesuch [13:44:16] <cafuego> hingo: The problem was that Provides can't be versioned, so the distro pkg always wins. [13:44:43] <hingo> cafuego: Ok, that makes more sense. [13:45:01] <cafuego> hingo: A friend suggested sticking an empty mysql-common package in and upping the epoch on that so the distro always loses :-) [13:45:38] <hingo> cafuego: So perl-dbi depends always on a specific version. [13:45:55] <cafuego> hingo: No, but it always grabs the newest version. [13:46:09] <cafuego> I think, let me check [13:46:36] <cafuego> wrong pkg [13:47:38] <cafuego> libdbd-mysql-perl [13:48:13] <cafuego> On my box that has a versioned depend on libmysqlclient15off (>= 5.0.27-1) [13:48:25] <hingo> cafuego: yes, but that is perl-dbi in commonspeak :-) [13:48:34] <cafuego> ;-) [13:48:53] <cafuego> So unless I stick libmysqlclient15off in my pkg it'll always keep the distro version. [13:49:01] <cafuego> a provides won't do it :-( [13:49:16] <hingo> cafuego: So not actually mysql-common as such, just that file? [13:49:41] <cafuego> Yeah I think so. It's been a while since I worked in it. [13:49:45] <cafuego> s/in/on/ [13:50:15] <cafuego> The client won't install without libdbd-mysql-perl and libdbd-mysql-perl won't install wtihout libmysqlclient15off [13:50:43] --> monk-eeee (~monk- eeee@c220-237-92-67.kelvn3.qld.optusnet.com.au) has joined #ourdelta [13:51:03] <hingo> cafuego: So why is the package name relevant at all then? it depends on a file name of a library. Can't the package name be called anything? [13:51:15] <cafuego> hingo: sorry? [13:51:27] <cafuego> hingo: I'm only talking pkg names here. [13:51:41] <hingo> the package name is mysql-common [13:51:54] <cafuego> So with my maria 5.1.42-mariadb68 package [13:53:01] <hingo> mysql-common_5.1.42-mariadb68_all.deb [13:53:22] <cafuego> mariadb-client-5.1 depends on libdbd-mysql-perl (which is provided by the distro, and thus I can't edit its depends) depends on libmysqlclient16 (>= 5.1.21-1) [13:54:02] <cafuego> if I create libmariadbclient16 witha Provides: libmysqlclient16 the distro will NOT install that in preference [13:54:12] <hingo> Ok, I get the libmysqlclient packages. I was speaking about mysql-common in http://mirror.ourdelta.org/deb/dists/lenny/mariadb-ourdelta/ [13:55:52] <cafuego> AH yep. So something depends on libmysqlclient15off [13:57:00] <cafuego> I don't think I have a lenny box handy :-/ [13:57:18] <hingo> But libmysqlclient15off is a separate package? [13:57:22] <cafuego> yes [13:57:43] <cafuego> that's the name of the pkg provided by the distro, that would override a Provides in the maria packages [13:59:38] <hingo> cafuego: I'm confused. mariadb-common does not contain libmysqlclient15off or any other libmysqlclient. [13:59:39] <cafuego> There's 134 packages in Lenny that depend on libmysqlclient15off. [14:00:02] <hingo> I mean of course mysql-common from the mariadb repo. [14:00:47] <cafuego> I swear I had a good reason at the time ;-) [14:01:38] <cafuego> Oh that's right. [14:01:40] <hingo> Ok. I can see how there could be a similar reason as for libmysqlclient* problems. You kind of answered my second question anyway. [14:01:56] <cafuego> Packages depend on libmysqlclient15off and libmysqlclient15off depends on mysql-common. [14:02:09] <hingo> ok. [14:02:24] <hingo> Yes, of course. [14:02:44] <cafuego> libmysqlclient15off has a versioned depend, so a provides line in mariadb-common doesn't override that [14:03:21] <cafuego> I think I got stuck in circular depependency land and yelled at my machine a lot. Then I decided to just not rename everything :-) [14:03:36] <hingo> Hmm... I bet that versioned depend isn't really necessary. It's just a .cnf file there... [14:04:08] <cafuego> hingo: probably, but it's a distro pkg so I can't change it without actually providing a package of that name anyway. [14:04:25] <hingo> cafuego: No, of course. [14:04:40] <cafuego> So it went into the "currently unfixable" basket [14:04:45] <cafuego> Well [14:05:25] <cafuego> It's easily fixable as long as I don't expect users to want to simply 'aptitude upgrade', but instead download depdns and manually install them with dpkg. [14:05:50] <hingo> cafuego: Btw, do you have an idea why RPM based systems avoid this same problem? For them it works with a Provides? [14:06:11] <hingo> cafuego: No we of course want to support apt-get/aptitude. [14:06:33] <hingo> cafuego: We are looking into getting MariaDB into Debian itself, but then we cannot have 2 packages with the same name. [14:07:18] <cafuego> Ah yes. [14:07:46] <cafuego> Well, in *theory* they shouldn't have that awful depend in squeeze [14:07:47] <hingo> This smells apt bug to me actually. -- Henrik Ingo Project Manager and COO, Monty Program Ab hingo@askmonty.org, skype:henrik.ingo, +358405697354 http://askmonty.org/wiki/index.php/About_Us What's up with MariaDB? http://askmonty.org/wiki/index.php/MariaDB ------------------------------------------------------- -- email: henrik.ingo@avoinelama.fi tel: +358-40-5697354 www: www.avoinelama.fi/~hingo book: www.openlife.cc