Generate fedora-atomic images using dib

It consumes an external deployed tree, and generates a
cloud bootable image based on that. It relies on lvm element
to generate the volumes needed for the image.

Change-Id: Ie681064d799279519adcc8e1bcf7a61ff9120042

magnum/elements/fedora-atomic/README.rst

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+=============
+fedora-atomic
+=============
+
+Generates a Fedora Atomic image based on a public deployed tree. This element has been tested under Debian, Ubuntu, CentOS and Fedora operating systems.
+
+Pre-requisites to run diskimage-builder
+---------------------------------------
+For diskimage-builder to work, following packages need to be
+present:
+
+* python-dev
+* build-essential
+* python-pip
+* kpartx
+* python-lzma
+* qemu-utils
+* yum
+* yum-utils
+* python-yaml
+
+For Debian/Ubuntu systems, use::
+
+    apt-get install python-dev build-essential python-pip kpartx python-lzma qemu-utils yum yum-utils python-yaml
+
+For CentOS and Fedora < 22, use::
+
+    yum install python-dev build-essential python-pip kpartx python-lzma qemu-utils yum yum-utils python-yaml
+
+For Fedora >= 22, use::
+
+    dnf install python-dev build-essential python-pip kpartx python-lzma qemu-utils yum yum-utils python-yaml
+
+diskimage-builder can be installed using pip::
+
+    pip install diskimage-builder
+
+How to generate Fedora Atomic image
+-----------------------------------
+To generate an atomic image for Fedora 23 these commands can be
+executed::
+
+    export ELEMENTS_PATH=/path/to/diskimage-builder/elements:/path/to/magnum/elements
+    export DIB_RELEASE=23     # this can be switched to the desired version
+    export DIB_IMAGE_SIZE=2   # we need to give a bit more space to loopback device
+    disk-image-create fedora-atomic
+
+This element can consume already published trees, but you can use it
+to consume your own generated trees. Documentation about creating own trees
+can be found at `http://developers.redhat.com/blog/2015/01/08/creating-custom-atomic-trees-images-and-installers-part-1/ <http://developers.redhat.com/blog/2015/01/08/creating-custom-atomic-trees-images-and-installers-part-1/>`_
+
+Environment Variables
+---------------------
+
+To properly reference the tree, the following env vars can be set:
+
+FEDORA_ATOMIC_TREE_URL
+  :Required: Yes
+  :Description: Url for the public fedora-atomic tree to use. It can
+                reference to own published trees.
+  :Default: `https://dl.fedoraproject.org/pub/fedora/linux/atomic/23/ <https://dl.fedoraproject.org/pub/fedora/linux/atomic/23/>`_
+
+
+FEDORA_ATOMIC_TREE_REF
+  :Required: Yes
+  :Description: Reference of the tree to install.
+  :Default: 954bdbeebebfa87b625d9d7bd78c81400bdd6756fcc3205987970af4b64eb678

magnum/elements/fedora-atomic/element-deps

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+fedora-minimal
+growroot
+package-installs
+vm

magnum/elements/fedora-atomic/environment.d/50-fedora-atomic

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+export FEDORA_ATOMIC_TREE_URL=${FEDORA_ATOMIC_TREE_URL:-https://dl.fedoraproject.org/pub/fedora/linux/atomic/23/}
+export FEDORA_ATOMIC_TREE_REF=${FEDORA_ATOMIC_TREE_REF:-954bdbeebebfa87b625d9d7bd78c81400bdd6756fcc3205987970af4b64eb678}

magnum/elements/fedora-atomic/finalise.d/80-fedora-atomic

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+#!/bin/bash
+
+if [ ${DIB_DEBUG_TRACE:-0} -gt 0 ]; then
+    set -x
+fi
+set -eu
+set -o pipefail
+
+# generate ostree in root
+cd /
+ostree admin os-init fedora-atomic
+ostree remote add --set=gpg-verify=false fedora-atomic ${FEDORA_ATOMIC_TREE_URL}
+ostree pull fedora-atomic ${FEDORA_ATOMIC_TREE_REF}
+ostree remote delete fedora-atomic
+ostree admin deploy --os=fedora-atomic ${FEDORA_ATOMIC_TREE_REF} --karg-proc-cmdline --karg=selinux=0
+
+# copy /etc/fstab to the deployed directory
+SYSROOT=/ostree/deploy/fedora-atomic/deploy/${FEDORA_ATOMIC_TREE_REF}.0
+cp /etc/fstab $SYSROOT/etc/
+
+# need to find the generated images
+DEPLOYED_DIRECTORY=$(find /boot/ostree -name fedora-atomic-* -type d)
+DEPLOYED_ID=${DEPLOYED_DIRECTORY##*-}
+INIT_IMAGE=$(find ${DEPLOYED_DIRECTORY} -name initramfs*.img)
+
+# generate ostree boot
+cat > /etc/grub.d/15_ostree <<EOF
+cat <<EOL
+menuentry 'Fedora 23 (ostree)' --class gnu-linux --class gnu --class os --unrestricted "ostree-0-${DIB_IMAGE_ROOT_FS_UUID}" {
+set gfxpayload=text
+insmod gzio
+insmod part_msdos
+insmod ext2
+search --no-floppy --set=root --label ${DIB_ROOT_LABEL}
+linux16 ${DEPLOYED_DIRECTORY}/vmlinuz root=LABEL=${DIB_ROOT_LABEL} ro nofb nomodeset vga=normal console=tty0 console=ttyS0,115200 no_timer_check rd.shell=0 ostree=/ostree/boot.1/fedora-atomic/${DEPLOYED_ID}/0
+initrd16 ${INIT_IMAGE}
+}
+EOL
+EOF
+chmod +x /etc/grub.d/15_ostree
+
+# start cloud-init on boot
+ln -sf $SYSROOT/usr/lib/systemd/system/cloud-config.service $SYSROOT/etc/systemd/system/multi-user.target.wants/cloud-config.service
+ln -sf $SYSROOT/usr/lib/systemd/system/cloud-final.service $SYSROOT/etc/systemd/system/multi-user.target.wants/cloud-final.service
+ln -sf $SYSROOT/usr/lib/systemd/system/cloud-init.service $SYSROOT/etc/systemd/system/multi-user.target.wants/cloud-init.service
+ln -sf $SYSROOT/usr/lib/systemd/system/cloud-init-local.service $SYSROOT/etc/systemd/system/multi-user.target.wants/cloud-init-local.service
+
+# update docker configuration
+cat > $SYSROOT/etc/sysconfig/docker-storage <<EOF
+DOCKER_STORAGE_OPTIONS="--storage-opt dm.thinpooldev=/dev/mapper/docker-docker--pool"
+EOF
+
+# disabled docker-storage-setup
+rm $SYSROOT/etc/systemd/system/multi-user.target.wants/docker-storage-setup.service
+
+# remove previous entry and generate config
+rm /etc/grub.d/10_linux
+grub2-mkconfig -o /boot/grub2/grub.cfg
+
+# remove non usable images
+rm -rf /boot/vmlinuz*
+rm -rf /boot/initramfs*
+
+# image cleanup
+if [ $DIB_RELEASE -ge 22 ]; then
+    dnf -y remove dracut grubby kernel initscript man-pages redhat-lsb-core selinux-policy selinux-policy-targeted
+    dnf autoremove
+    dnf clean all
+else
+    yum -y remove dracut grubby kernel initscript man-pages redhat-lsb-core selinux-policy selinux-policy-targeted
+    yum autoremove
+    yum clean all
+fi

magnum/elements/fedora-atomic/package-installs.yaml

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+# Install packages needed for atomic
+ostree: