I have seem some occasional odd failures coming from the "dnf -y
update" done by elements/base/install.d/00-up-to-date.
dnf seems to sometimes think a package is not installed when it really
is. It then seems to try and re-install them, but notices they are
installed, and then bails with a failure exit [1]. The packages that
seem to cause this vary, but the common thread is that they seem to
have all been installed during the initial phase of installing the
package manager in the chroot.
I suspect that when we are building the chroot, we do our initial
install with the "external" yum & rpm. Then we start using the
dnf/yum in the chroot, but we're actually using meta-data created by
the *external* tools -- which could be vastly different versions or
who-knows-what. While I honestly I don't have an exact root cause,
empirically I've found rebuilding the rpm db always seems to fix
things up.
So this change takes care to rebuild the rpm db with the chroot
version of rpm, and clear out the package metadata for a refresh with
"update". This should hopefully put us in a consistent state.
[1] http://paste.openstack.org/show/487356/
Change-Id: I565df23897ae511356c4861fdbe63823fa6b6ff9
6f622fb7c9