Adds the ability to set $DIB_LOCAL_IMAGE to use as the base cloud image
for a Fedora image build. There are many repetitve tasks that are done
every image build. With this change you can build an image with the
fedora and vm element and then reuse the resulting image as input to
future image builds. This greatly reduces future image build times.
For instance 99-up-to-date is already taking almost 2 minutes (even with
rpm downloads already cached) for Fedora 20, and is only going to keep
taking longer. By having a local up to date Fedora cloud image, this
time can be saved on each image build.
There is one minor change to support this in that /tmp/grub needs to get
cleaned up at the end of image builds so that the image can be reused.
Plus, there is no reason for it to stick around anyway. (didn't think
this was worth a seperate commit).
Change-Id: Ic74d138da922ecc99c38c27f105170d90009a84a
Before downloading and caching the latest version of grub2, we need to
first remove all old versions. Otherwise, the find command that writes
the grub2 version to /tmp/grub/install to install during the finalise
phase could pick one of the older versions of grub2 in the cache. This
will cause the install during the finalise phase to fail since the older
version of grub2 will conflict with the newer installed version of
grub2-tools.
Change-Id: I5b43e359db3ba81ed6283dfb41c7e89629516d38
When uninstalling grub2, leave all its dependencies
including grub2-tools installed to minimise the number of packages
which need to be installed in the finalise stage.
Since the yum cache is unmounted during finalise, installing
grub2 in finalise is slowed by re-populating the yum cache.
This change copies the grub2 rpm out of the yum cache so it can be installed
from file during finalise.
This should prevent disk becoming full during finalise on Fedora.
Closes-Bug: #1217185
Change-Id: If095adc4abb52a19a3aa0b1caebfb3e4d8f605ef
Qemu-nbd does not perform well with older versions of qemu due to
the lack of writeback caching mode. It also only builds qcow2 images
and there is a desire for raw image support. Finally, qemu-nbd makes
it very difficult to build images concurrently due to the somewhat
opaque nature of how it selects a /dev/nbd# device. losetup, on
the other hand, makes this process very straight forward.
Change-Id: I309fad8af4fd1e8d1720c17b65e1897a76d5e897
Co-Author: Clint Byrum <clint@fewbar.com>
