[CentOS-devel] ostree as a delivery model

[Colin Walters]

On Fri, Apr 4, 2014 at 7:02 PM, Les Mikesell <lesmikesell at gmail.com> 
wrote:
> 
> - and be able to follow the updates after they have been
> installed/blessed on the master. 

Right.

>  This looks close, but not quite...
> I think there should be a list of repositories that maintain the
> packages in all the referenced versions,

I'm not quite sure what you're suggesting here.  There are two kinds of 
repositories: yum and ostree.  When you say "maintain the packages" are 
you talking about "treecompose", i.e committing a set of RPM packages 
to an OSTree repository?

>  and the main part would just
> be a version-controlled package list and maybe some diffs/patches to
> configurations.

Right, that's what 
https://github.com/cgwalters/fedora-atomic/blob/master/products.json
boils down to - it's a list of trees, each of which are composed of a 
set of packages.

https://github.com/cgwalters/fedora-atomic/commit/cb3b741616b5d11a00950e8f616c03f998bd474d

is a sample commit that added rpm-ostree to the trees shipped on each 
client.

Another example is that if I decided tmux was awesome and everyone 
should have it, I could push:

diff --git a/products.json b/products.json
index ed99ccd..41133e9 100644
--- a/products.json
+++ b/products.json
@@ -23,7 +23,8 @@
 
     "packages": ["kernel", "rpm-ostree", "generic-release", "lvm2",
    "btrfs-progs", "e2fsprogs", "xfsprogs",
-	 "rpm-ostree-public-gpg-key", "gnupg2"],
+	 "rpm-ostree-public-gpg-key", "gnupg2",
+	 "tmux"],
 
     "postprocess": ["remove-root-password"],
 

Conversely, I could remove it later, and it would disappear from the 
trees, and then vanish when client machines ran "rpm-ostree upgrade".  
This is a huge difference from traditional package management per 
client, where packages normally linger on unless explicitly removed.