Re: installing mysql-phpmyadmin-apache-php

From: Matthew Seaman (m.seaman_at_infracaninophile.co.uk)
Date: 04/27/04

  • Next message: Kris Kennaway: "Re: Error in updating INDEX.db" 
    Date: Tue, 27 Apr 2004 21:06:27 +0100
To: Jonathan Arnold <jdarnold@buddydog.org>

    On Tue, Apr 27, 2004 at 12:17:37PM -0400, Jonathan Arnold wrote:
    > Matthew Seaman wrote:

    > >Actually, the versions of apache and mysql are controlled through the
    > >dependency chain by the PHP port you install. The phpmyadmin port
    > >just wants to see that PHP is installed.
    > >
    > >Setting the following in /etc/make.conf will make your system default
    > >to apache2 and mysql-5:
    > >
    > > APACHE_PORT= www/apache2
    > > WITH_APACHE2= yes
    > >
    > > WANT_MYSQL_VER= 50

    > Interesting note. Is there a way to figure this out? Is there a generic
    > way to specify a newer version is okay? What is a "dependency chain" and
    > how does one find it?

    Figuring out what flags you can use to affect compilation of ports is
    usually a matter of grovelling through Makefiles -- the flags are
    pretty obvious: anything starting WITH_ or WITHOUT_ or WANT_ should be
    a user-tunable. Anything listed in an OPTIONS variable similarly.
    Stuff starting USE_ is not.

    There may be other variables you can tweak, but you'll have to read
    the Makefiles carefully to understand what they do. Other sources of
    information include the /usr/ports/Mk/bsd.*.mk files: bsd.port.mk in
    particular has a nice comment section explaining what all the
    variables it uses are for. There is a great deal of documentation in
    the Porter's Handbook, although that is aimed more at people who write
    and maintain ports:

        http://www.freebsd.org/doc/en_US.ISO8859-1/books/porters-handbook/index.html
    Also you can hang around on the freebsd-ports@... mailing list, where
    there are fairly frequent discussions of this sort of thing.

    The WANT_ type variables are generally used to select between a number
    of alternate but mutually incompatible versions of some software that
    could be used to fulfil a dependency. If you don't set WANT_FOO, the
    port will usually just go with whatever version of FOO you have
    already installed, or if you havent already installed FOO, it will
    cause a default version to be installed. This sort of construct is
    seen in several families of related ports: MySQL, Berkeley DB,
    OpenLDAP for example. Where the port requires a dependency version
    different to and incompatible with what you have already installed, it
    should print out a reasonable error message rather than continuing to
    install anything. This mechanism isn't used everywhere it could be,
    for instance the way that a Java JVM dependency is specified is quite
    different.

    The 'dependency chain' is just the list of things that have to be
    installed before the port of interest, but expressed in terms of what
    explicitly requires what. Thus databases/phpmyadmin requires one of
    the PHP ports to be installed -- choose from lang/php4, www/mod_php4
    etc. lang/php4 requires databases/mysqlXX-client to be installed (by
    default: you can turn off mysql support by twiddling with varios
    options).

    At each stage you can see what each port depends on to build and
    install by looking at the value of various _DEPENDS variables. eg:

        % cd /usr/ports/databases/phpmyadmin
        % make -V RUN_DEPENDS
        /usr/local/include/php/main/php.h:/usr/ports/www/mod_php4
        % make -V BUILD_DEPENDS
        
        % make -V LIB_DEPENDS
        

    and you can get a summary list of all dependencies and dependencies of
    dependencies by:

        % make pretty-print-run-depends-list
        This port requires package(s) "apache-2.0.49 expat-1.95.7 mod_php4-4.3.6,1 mysql-client-4.0.18_1" to run.
        % make pretty-print-build-depends-list

    (Bad example -- the build dependencies are empty for this port, but
    you get the idea)

    The 'pretty-print-...' make targets extract the answer they print out
    from the /usr/port/INDEX or INDEX-5 files: a large part of the time
    taken to produce those indexes is actually chasing and compiling the
    complete list of dependencies for every port.

            Cheers,

            Matthew 

    -- 
Dr Matthew J Seaman MA, D.Phil.                       26 The Paddocks
                                                      Savill Way
PGP: http://www.infracaninophile.co.uk/pgpkey         Marlow
Tel: +44 1628 476614                                  Bucks., SL7 1TH UK

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