[CentOS-devel] evil centosplus dependency circle

Johnny Hughes mailing-lists at hughesjr.com
Wed Feb 28 08:39:57 UTC 2007


On Wed, 2007-02-28 at 00:48 +0100, Michael Gabriel wrote:
> trying a yum update on mysql, postgres or php forces the others to
> install. is that really wanted ??

Here is some testing on a system with nothing else installed:
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
[root at i386 ~]# yum --enablerepo=centosplus install php

<snip>

=============================================================================
 Package                 Arch       Version          Repository        Size
=============================================================================
Installing:
 php                     i386       5.1.6-3.el4s1.5  centosplus        1.1 M
Installing for dependencies:
 apr                     i386       0.9.4-24.5.c4.2  base               88 k
 apr-util                i386       0.9.4-21         base               51 k
 curl                    i386       7.12.1-8.rhel4   base              231 k
 httpd                   i386       2.0.59-1.el4s1.5.el4.centos  centosplus        928 k
 libidn                  i386       0.5.6-1          base              169 k
 php-cli                 i386       5.1.6-3.el4s1.5  centosplus        2.0 M
 php-common              i386       5.1.6-3.el4s1.5  centosplus        135 k

Transaction Summary
=============================================================================
Install      8 Package(s)
Update       0 Package(s)
Remove       0 Package(s)
Total download size: 4.7 M

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

As you can see ... there is not a requirement for mysql or postgresql in
php by itself.

Now ... IF you install php-mysql and php-pgsql, that does change:

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
[root at i386 ~]# yum --enablerepo=centosplus install php php-mysql php-pgsql

=============================================================================
 Package                 Arch       Version          Repository        Size
=============================================================================
Installing:
 php                     i386       5.1.6-3.el4s1.5  centosplus        1.1 M
 php-mysql               i386       5.1.6-3.el4s1.5  centosplus         77 k
 php-pgsql               i386       5.1.6-3.el4s1.5  centosplus         61 k
Installing for dependencies:
 apr                     i386       0.9.4-24.5.c4.2  base               88 k
 apr-util                i386       0.9.4-21         base               51 k
 curl                    i386       7.12.1-8.rhel4   base              231 k
 httpd                   i386       2.0.59-1.el4s1.5.el4.centos  centosplus        928 k
 libidn                  i386       0.5.6-1          base              169 k
 mysql                   i386       5.0.27-1.el4.centos  centosplus        3.3 M
 perl-DBI                i386       1.53-2.el4s1     centosplus        602 k
 php-cli                 i386       5.1.6-3.el4s1.5  centosplus        2.0 M
 php-common              i386       5.1.6-3.el4s1.5  centosplus        135 k
 php-pdo                 i386       5.1.6-3.el4s1.5  centosplus        219 k
 postgresql-libs         i386       8.1.8-1.el4s1.1  centosplus        183 k

Transaction Summary
=============================================================================
Install     14 Package(s)
Update       0 Package(s)
Remove       0 Package(s)
Total download size: 9.1 M

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

In that case, you would get a portion of mysql and postgresql.

AND ... if you had mysql and postgresql installed, yum would want those
upgraded to the version in centosplus repo.

That is the way the Web Stack works ... all the components are designed
to work together.

Trying to make the Web Stack "mix and match" (ie, I want php-5 and
mysql-3 and postgresql-8 ... not mysql-5) would require many changes ...
and I spent 6 months begging/pleading/forcing RH to release the RHWAS
code.  It is a vastly superior stack for EL4 and is what the Enterprise
customers want, need, and are willing to by big bucks for.  It is based
the source code from:

http://www.redhat.com/solutions/rhappstack/

That is the CentOS Web Stack.  Not sure why it is evil ... all the
components work together and offer an upgrade path. 

Thanks,
Johnny Hughes
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