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For convenience, allow users to create an "overrides/" directory which
is a repo. If it exists, the builder automatically adds it.
(However, we should likely disallow distributing these builds on
the network)
We use the new unified OSTree API (OstreeSePolicy) to perform
labeling, rather than having our own here.
Also create a new rpm-ostree-relabeling-helper that is run to label
any leftover files such as /etc/fstab that we create offline, and also
to relabel the entire disk.
This is somewhat similar to what we've been doing with Continuous; we
take the manifest.json, and turn it into a "snapshot". Except here
there is a notion of inheritance.
This gets stored into the tree as /usr/share/rpm-ostree/treefile.json.
Additionally, it goes into the autobuilder directory in
products-built.json. Though really we should split up that file,
since it will be kind of...large.
It turns out OS X has bzip2 but not xz installed by default, so let's
use that instead. QCOW2 stays as xz since we can assume GNU/Linux
users have it better.
This allows us to skip the whole install process if the
RPMs haven't changed, which is a rather large win.
Part of this commit involves some code to attempt to talk to "yum
shell" for dependency resolution, in an attempt to avoid depsolving
twice, which just isn't really going to work, since "yum shell" isn't
an API as it turns out.
The only other real alternative is doing something PackageKit-like,
which is ~4000 lines of very nontrivial Python.
There are two major reasons:
1) I want to do things like process SELinux labels here, and that
type of thing is best done in C.
2) There are presently 3 languages in this code, and this takes us
down to just two.
We're moving more towards the autobuilder model; this allows us to
keep all of the data in one place. Important for the
cloud.fedoraproject.org instance since /mnt/ostree is the large
filesystem.
