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This is just a tech demo. Example usage:
```
mkdir -p ~/.cache/rpmostree-containers
cd ~/.cache/rpmostree-containers
rpm-ostree container init
cp /etc/yum.repos.d/CentOS-Core.repo rpmmd.repos.d
rpm-ostree container assemble bash
rpm-ostree container assemble httpd
```
This is in preparation for `rpm-ostree container`, which handles
unpacking RPMs as non-root.
At the moment, I'm copying code in from both ostree's libarchive bits
(fixable...may need to export some utility functions) and some
functions from libhif (harder, see:
http://lists.rpm.org/pipermail/rpm-ecosystem/2016-January/000297.html )
There's lots more cleanup to do here, but I don't want to block on the
resolution of the libhif changes.
For the same reasons as described in GNOME/ostree#187. In summary: we
want to make it easy for testers to clean up after we're done by not
setting the immutable flag.
Note that I had to also add it to setup-session.sh so that the daemon
inherited the env var. The libtest.sh hunk is redundant in that case,
but still necessary if the tests are run directly.
For some reason my CD builder didn't trigger this, but we do actually
need `-larchive` (and we want to have the dependency metadata so
packagers know to BuildDepends on it).
This is part of taking over from librpm. The most important high
level goal is fully unprivilged operation.
Right now we're basically starting to do what
http://libguestfs.org/supermin.1.html does, except in C, and
faster.
There's no reason that `compose tree` should require privileges.
However right now, things like `%post` scripts will want to run in the
target root - so we'd have to require `linux-user-chroot`.
Regardless of unprivileged operation though, another major thing we
can do is use our control over the unpacking process to do a lot more
sophisticated caching. We can build up a precise mapping of (rpm
ENVR, file path, selinux label) -> object and avoid rechecksumming
each time.
And even for files that aren't known, we can parallelize commit with
unpacking, etc. (Ok assuming treecompose-post won't mutate anything).
I'd like to experiment with different things that end up
reusing chunks of the rpm-ostree internals, such as libhif, the
helpers we already have around RPM, etc.
In this particular case I'm experimenting with unpacking/committing
RPM packages as non-root. Eventually most of this should end up as
internal private shared library, but it's convenient to have an
ABI-unstable and hidden "internals" command to run things directly.
This commit though just adds the scaffolding for "internals".
As we start to do more package things, extract common helper functions
around HifContext * that by default operates on the system root.
Some of these bits should go in libhif, but the immediate plan is to
iterate here, then push downwards later.
Besides porting GFile -> fd, I specifically want it to operate in an
append mode for package layering. Then given an existing tree, we
ensure we're not deleting the underlying tree's autovar files.
compose-server.md: Removed redundant treefile section
treefile.md: Edited to indicate that `bootstrap_packages` is no longer
mandatory and is effectively deprecated
Encountered a couple crash scenarios:
1) A commit with an invalid timestamp trips an assertion. Instead
show the timestamp as "invalid".
2) If a deployed commit is unsigned, the daemon will not include a
"signatures" array in the deployment's GVariant representation.
The logic for --pretty was assuming the "signatures" array is
always present.
