https://github.com/cgwalters/atomic-pkglayer

Demo of package layering
https://github.com/cgwalters/atomic-pkglayer

Last synced: 26 days ago
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Demo of package layering

• Host: GitHub
• URL: https://github.com/cgwalters/atomic-pkglayer
• Owner: cgwalters
• License: other
• Created: 2014-09-25T22:53:47.000Z (about 10 years ago)
• Default Branch: master
• Last Pushed: 2016-02-04T08:17:33.000Z (almost 9 years ago)
• Last Synced: 2023-04-13T18:08:32.095Z (over 1 year ago)
• Language: Python
• Size: 40 KB
• Stars: 3
• Watchers: 4
• Forks: 2
• Open Issues: 0
• Metadata Files:
  • Readme: README-old.md
  • License: COPYING

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README

        
This patchset has moved

-----------------------

See https://github.com/projectatomic/rpm-ostree/pull/107

Layering RPM packages on top of an (rpm-)ostree tree

----------------------------------------------------

This is a proof-of-concept for RPM package layering on top of an

OSTree base tree.  It is only a demonstrator; do not use in

production.

To use:

    # ./atomic-pkglayer add strace

Now, let's try:

    # ostree admin status

What's up with that ?  Well, OSTree is telling us

it no longer knows how to upgrade the system.  If you look at the

origin file underneath `/ostree/deploy/.../*.origin` for the new

deployment, you'll see that we have listed the additional packages,

and the refspec is now `base_refspec`.

And indeed if we try it:

    # atomic upgrade

    error: No origin/refspec in current deployment origin; cannot upgrade via ostree 

Anyways, let's reboot, and notice that strace is available.

    # systemctl reboot

    # rpm -q strace 

A very important thing to note; we do have a single unified RPM

database, still in /usr/share/rpm.

Upgrading

---------

    # ./atomic-pkglayer upgrade

This will check for *both* tree upgrades and new packages.  Oh, and it

will redownload the packages every time.  Because, again, this is just

a proof of concept...

Removing layered packages

-------------------------

    # ./atomic-pkglayer remove strace

Unlike most package systems, this can *only* be used to remove

explicitly added packages.  It's not allowed to remove packages from

the base tree, nor packages that are intermediate dependencies of

added packages.

Integrating this into rpm-ostree

--------------------------------

There are a number of reasons I wrote this proof-of-concept as an

addon layer.

 * The whole subject deserves a lot of thought and careful coding,

   and ultimately will require changes in RPM to make this work more

   widely.

 * There's a strong drive right now to backport rpm-ostree to EL7,

   and that limits the dependency/feature growth.

 * For rpm-ostree, we intend to use the new C libraries of hawkey/librepo

   for package management - this will allow much tighter integeration

   than using yum allows.

 * yum is GPL, rpm-ostree is LGPL (for several reasons, but an important one

   is to allow ASL2.0 code to link to it)