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Originally I was trying to have all of the treefile parsing
in treecompose, and then call other functions as API. But that
turns out to be unrealistic. We'll need finer grained control
over this in the future.
Therefore, let's move the boot-location handling down, in preparation
for further commits which parse the treefile in the commit phase.
This is the equivalent of the 'removefrom' verb in Lorax's templating.
It's a lot more robust than a generic "rm-rf" type thing, because most
often you only want to remove files from particular packages.
It seems clearer to me if all code which is operating on the content
(such as enabling systemd units) is under -postprocess. The "compose
tree" code should be tying everything together and calling out to
sub-components.
This is prep for adding more postprocessing code.
We might as well do what systemd does and have a big header which
defines all of them, to more conveniently share them for libraries
that don't include them (like hawkey/librepo, as well as things that
libgsystem doesn't yet cover).
For some reason we ended up defining our own macro to define cleanup
functions, when libgsystem has a usable one. Switch to that, fewer
lines of code, more consistency.
I was looking again at using hawkey/librepo, and realized just how
much I'd have to fight all of these libraries to avoid affecting
the running system.
What we really want to do with librepo/hawkey is run them effectively
unprivileged, and to hide the system's RPM database from them. This
is a baby step towards that, by confining our existing yum.
- /usr, /etc, and /var/lib/rpm are mounted read-only
- yum is now run under CLONE_NEWPID, to avoid stray %post scripts
affecting system processes
This is taking us closer to deeper integration in the treecompose side
with RPM instead of forking out to things.
It works except...we end up with the dreaded __db.001, .dbenv.lock
files =/ Best option would be to teach RPM how to open a database
really read-only. Failing that, could use the immutable bit?
These lock and dbenv files are created by RPM when it accesses the
database read-write, but we only want read-only. Sadly that turns out
to be very, very hard to plumb through all the layers in
hawkey/libsolv etc.
So let's just forcibily remove them after postprocessing.
Since we're only quering the database once (and at least
one of the locations is going to be read-only), don't
create the cache.
Noted while just reading the code while working on something else.
I'd been resisting this for a long time - I really wanted the tree to
be a reflection of the packages; and not go down the path of
"forking".
The lorax model has shown that while you can definitely get a large
space reduction that way, you're going to be perpetually chasing
changes in the packages. No matter how good your templates are.
Furthermore, lorax is just to generate the installer - it's an OS that
runs a single app. Whereas here we're generating the target runtime
system; we can't add bugs.
Nevertheless, reality is that sometimes it's just too hard to change
the input package set - there's a risk of breaking things. Namely,
we're introducing a new update system here, but obviously there's a
previous one: yum. Upstream packages keep growing a dependency on it.
Note this patch allows *not* removing all files from the package,
because it's possible that other things (e.g. subscription-manager)
import it as a library.
So in the meantime while we're iterating on this, let's support:
"remove-files": ["usr/bin/yum"],
The code is generic beyond yum for obvious reasons, but I don't
think we should use it for a lot more than that.
Having content in /boot in OSTree was always ugly, because we ended up
mounting over it in the deployment location at boot.
This was even worse in the anaconda rpmostreepayload code, because of
the juggling of the mount point that needed to take place.
Trying to add a GRUB2 backend to OSTree is what finally forced this
change. Now, we put kernels (in the tree) by default in *both* /boot
and /usr/lib/ostree-boot.
OSTree itself knows to look in both locations. Anaconda is going to
just hard require trees with the new location though.
This would probably be best if we invoked systemctl in the compose
tooling, but at the moment we don't have any execution of target code
on the host. It's fine to assume that it's in /usr/lib.
We can revisit this if we start doing chrooted/containerized
execution.
"atomic rebase" is mostly a copy of "ostree admin switch", so let's
also pick up the changes in ostree admin switch for the new
unconfigured state flag.
This allows a user to "atomic rebase" on an unconfigured system.
Related: #31
For the test suite, we're doing an upgrade offline of another OS root.
What we should maybe do is print the package diff from the merge
deployment, if not the booted one.
However, I think this is OK for now.
Some downstreams want the ability to separate the compose tooling from
the client, for e.g. support reasons.
This approach supports generating a tarball without the source for the
compose command, and requires specifying a config option to disable
it.
