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The high level goal is to deprecate libgsystem. I was trying to share
code between ostree/rpm-ostree, but it was too painful to commit to
forver frozen ABI for new utility APIs.
The git submodule approach will much more easily allow breaking
API/ABI, and iterate on APIs until they either land in GLib or not.
Note that libglnx will not use GFile*, so a full port to it will
involve also not using that. Thus, it will be necessarily
incremental; in the meantime we'll link to both libgsystem and
libglnx.
This is a convenient way for external tools to integrate rpm-ostree
better into automation. With the caching, it's now cheaper to
just rerun rpm-ostree if you know an input yum repository changed,
or just on a timer.
Then one can use this flag to determine whether or not to launch any
further processes after rpm-ostree, such as disk image generation,
test suites, etc.
With yum, we would have had to make a custom Python app to cleanly
separate the fetch metadata/depsolve phases from installation.
Now that libhif/hawkey gives us that, make use of it by exiting after
depsolve if the previous compose has the same package set, and the
treefile is the same. This saves a fairly substantial amount of time
and I/O, and makes it much more palatable to simply run the compose
tool on demand in response to say repo regeneration notifications.
A further important note; --cachedir is no longer used; we store the
inputhash in the OSTree commit metadata itself.
There are a lot of advantages to this. See the linked issue
for more details, but briefly:
- Lays the groundwork for package layering
- Better caching (exit compose after depsolve if no changes)
- Better error handling
- Potential for unprivileged package downloads
- Potential to better containerize installs
TODO:
- langs handling
- progress output
Closes: https://github.com/projectatomic/rpm-ostree/issues/53
I'm planning to replace the caching code with something that inspects
the previous commit rather than a lookaside cache, so raise this code
up to a higher level.
The checking code from #56 landed, and started triggering for me on
the `dockerroot` user. It's nice to know it works. Then the issue
is... "what now"?
It turns out in the case of `dockerroot` it's actually unused, so we
could fix this by deleting it. But in general we need to support
dynamic uids/gids/. And we can't yet take a hard dep on #49.
So this patch changes things so we take a copy of the passwd/group
data from the previous commit. Any users subsequently added in the
*new* commit will be additive.
Closes: https://github.com/projectatomic/rpm-ostree/issues/78
Verify uid/gid on files, directories and symlinks
Just output a msg when user/group is removed with no files
json-parsing: Add functions for strictly dealing with ints
passwd/json: Add simple scripts to convert passwd/group files to json data
docs: Check-passwd/groups and ignore-remove-users/groups JSON config. entries
Refactor command-line parsing to better utilize GOptionContext. This
eliminates most of the manual parsing and global options are now shown
in the help output.
Some of the changes here are not strictly necessary for rpm-ostree,
but are done for consistency with ostree's command-line parsing.
The "rpm" subcommand needs some extra attention, so that's been split
into a separate commit.
The current motivation for this is that
https://github.com/fedora-infra/fedmsg-atomic-composer
started using mock --new-chroot (which uses systemd-nspawn) to run
rpm-ostree, which in turn uses systemd-nspawn to run the post script.
Now systemd-nspawn is not really nestable (it wants to link up
journald, resolv.conf handling, etc).
First, dropping nspawn and going to raw containers fixes the nesting
problem.
Second, we don't need all the features of systemd-nspawn. We are ok
with log messages going to stdout, and we don't use networking, so no
resolv.conf is needed.
Third, this sets a bit of a stage for more sandboxing internally when
run on real systems. I already have a prototype branch which runs
librepo as an unprivileged user, that could be combined with this for
even stronger security.
Why not use systemd? Well...I'm still debating that. But the core
problem is systemd isn't a library in the C sense - to use its
sandboxing features we have to use unit files. It's harder to have a
daemon that looks like a single service from a management perspective,
but uses sandboxing internally.
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.
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).
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?
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.
Since the treefile format now supports includes, we would need to
either include the whole chain, or just the expanded portion we use in
the compose. This patch does the latter.
This should allow a client to take the same treefile and generate a
similar tree (if they want to reproduce with the same RPMs, those can
be extracted from the RPM database inside the tree).
As a developer, a workflow I have for testing things is to create
an RPM, toss it into a local yum repository, then do a compose.
However at the moment to add the local overrides I have to edit the
treefile, which is annoying. Let's add a commandline override for
this.
Note this also deletes the old "repos_data" code which was not being
used.
In 827e711 we stopped running two yum transactions. This means the
code that detects if the repodir exists in the yum installroot will
always return false and the code is dead.
