[scl.org] scl register script

[Honza Horak]

Moving this topic to sclorg at redhat.com since this is an example of a 
topic I'd like to see discussed there in public. It is related to the 
'scl register' command, which is a scl-utils feature already available 
in [1]. Please, continue on sclorg at redhat.com ML.

As for the idea, I like it as Jan proposed it and if nobody has 
objections we'll use that for new databases packages as well.

As soon as we reach some conclusion here we should document it in the 
Guide [2] and maybe even mention it as good practice in the scl-utils 
doc/man/wherever register is documented?

[1] https://github.com/sclorg/scl-utils
[2] https://www.softwarecollections.org/en/docs/guide/

Honza


-------- Forwarded Message --------
Subject: scl register script
Date: Thu, 08 Jan 2015 13:55:41 +0100
From: Jan Kaluža <jkaluza at redhat.com>

Hi,

I was thinking about "scl register" script (/opt/rh/foo/register). This
script is called when SCL is registered (as result of "scl register foo"
command).

There can be just single "register" script per collection. I think it
would be better to have a directory (let's call it "register.d") where
all packages in the collection could put their register scripts and the
main register script (the one included in meta-package) would just call
each script in this directory.

This would handle following situations:

- If we add new package/directory/file which has to be handled by the
register script, we don't have to change the register script in the
meta-package and rebuild it, because the responsible register script
would be part of the updated package.

- If we have for example httpd24 SCL, we want to copy httpd
configuration into /etc/opt in the register script, but we want to do
that *only* when httpd24-httpd package is installed.

So to sum it up, I'm proposing following structure for the
register/unregister scripts:

/opt/rh/foo/register - owned by "foo", calls scripts in "register.d"
/opt/rh/foo/register.d/foo-bar - owned by foo-bar, registers foo-bar
subpackage of foo SCL.

/opt/rh/foo/unregister - owned by "foo", calls scripts in "unregister.d"
/opt/rh/foo/unregister.d/foo-bar - owned by foo-bar, unregisters foo-bar
subpackage of foo SCL.

Regards,
Jan Kaluza