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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.
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).
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.
We had `src/lib` having its own little private library; I wanted to
use some of it inside `src/libpriv`, so let's consistently have all
private utility code in `src/libpriv`.
Closes: https://github.com/projectatomic/rpm-ostree/pull/147
On the plus side, we share some code between the library and the
binary now. On the downside, because `librpmostreepriv.la` is a
noinst library, its code text is duplicated between the shared library
and binary, at least until we either:
- Have the binary solely use the public shared library (like ostree does)
- Install `librpmostreepriv.so` to e.g. `/usr/lib64/rpm-ostree/librpmostreepriv.so`
without the headers being public
