Initial centos7 support

Initial support for a centos7 image.

This is separate to rhel7 because the major differences are things
like repo and image locations, which are always going to be different.
We should merge any real changes into the redhat-common layers.

Apart from the added support files in centos7/*, the other change is
mostly modifications to redhat-common's extract-image to handle
different partition layouts of the centos7 image.

Change-Id: I943abe5ff0a803f36eda266a79af0d9220edcae7

elements/centos7/README.md

@@ -0,0 +1,3 @@
+Use Centos 7 cloud images as the baseline for built disk images.
+
+For further details see the redhat-common README.

elements/centos7/element-deps

@@ -0,0 +1,6 @@
+cache-url
+dib-run-parts
+redhat-common
+rpm-distro
+source-repositories
+yum

elements/centos7/element-provides

@@ -0,0 +1 @@
+operating-system

elements/centos7/environment.d/10-centos7-distro-name.bash

@@ -0,0 +1 @@
+export DISTRO_NAME=centos7

elements/centos7/install.d/00-install-cloud-init

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+set -eu
+set -o pipefail
+
+install-packages cloud-init

elements/centos7/pre-install.d/06-yum-repos

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+set -eu
+set -o pipefail
+
+cat << EOF > /etc/yum.repos.d/centos7-latest.repo
+[rhel7]
+name=centos7
+baseurl=http://buildlogs.centos.org/centos/7/os/x86_64-latest/
+enabled=1
+metadata_expire=7d
+gpgcheck=0
+EOF
+
+cat << EOF > /etc/yum.repos.d/epel.repo
+[epel]
+name=Extra Packages for Enterprise Linux 7 - \$basearch
+mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-7&arch=\$basearch
+failovermethod=priority
+enabled=1
+gpgcheck=0
+EOF

elements/centos7/root.d/10-centos7-cloud-image

@@ -0,0 +1,31 @@
+#!/bin/bash
+
+set -eu
+set -o pipefail
+
+[ -n "$ARCH" ]
+[ -n "$TARGET_ROOT" ]
+
+if [ 'amd64' = "$ARCH" ] ; then
+    ARCH="x86_64"
+fi
+
+DIB_LOCAL_IMAGE=${DIB_LOCAL_IMAGE:-}
+
+if [ -n "$DIB_LOCAL_IMAGE" ]; then
+    IMAGE_LOCATION=$DIB_LOCAL_IMAGE
+    # No need to copy a local image into the cache directory, so just specify
+    # the cached path as the original path.
+    CACHED_IMAGE=$IMAGE_LOCATION
+    BASE_IMAGE_FILE=$(basename $DIB_LOCAL_IMAGE)
+    BASE_IMAGE_TAR=$BASE_IMAGE_FILE.tgz
+else
+    DIB_RELEASE=${DIB_RELEASE:-Broken-20140620-Nightly}
+    DIB_CLOUD_IMAGES=${DIB_CLOUD_IMAGES:-http://buildlogs.centos.org/centos/7/cloud}
+    BASE_IMAGE_FILE=${BASE_IMAGE_FILE:-CentOS-7-$DIB_RELEASE.qcow2}
+    BASE_IMAGE_TAR=$BASE_IMAGE_FILE.tgz
+    IMAGE_LOCATION=$DIB_CLOUD_IMAGES/$BASE_IMAGE_FILE
+    CACHED_IMAGE=$DIB_IMAGE_CACHE/$BASE_IMAGE_FILE
+fi
+
+$TMP_HOOKS_PATH/bin/extract-image $BASE_IMAGE_FILE $BASE_IMAGE_TAR $IMAGE_LOCATION $CACHED_IMAGE

elements/centos7/source-repository-centos7

@@ -0,0 +1 @@
+lsb-release file /opt/stack/lsb-release/lsb_release https://bzr.linuxfoundation.org/loggerhead/lsb/devel/si/download/head:/lsb_release-20060624065236-gakl5b7e37gwk5mg-12/lsb_release

elements/pkg-map/bin/pkg-map

@@ -22,7 +22,7 @@ import sys
 
 def os_family(distro):
     family = None
-    if distro in ['centos', 'fedora', 'rhel', 'rhel7']:
+    if distro in ['centos', 'fedora', 'rhel', 'rhel7', 'centos7']:
         family = 'redhat'
     elif distro in ['debian', 'ubuntu']:
         family = 'debian'

elements/redhat-common/bin/extract-image

@@ -46,31 +46,43 @@ else
         RAW_FILE=$(basename $BASE_IMAGE_FILE)
         RAW_FILE=${RAW_FILE#.qcow2}.raw
         qemu-img convert -f qcow2 -O raw $CACHED_IMAGE $WORKING/$RAW_FILE
-        # WARNING: The mattdm image has the root filesystem on the second
+
-        #          partition (p2). If he changes the image the MAGIC_BIT
-        #          might also need to change.
-        # UPDATE to above warning alluding to Fedora18:
         # F19 images have the rootfs partition on p1
-        MAGIC_BIT=p1
+        # Centos7 images on p3 (p1 boot, p2 swap)
+        if [[ $DISTRO_NAME = "centos7" ]]; then
+            ROOT_PARTITON=p3
+        else
+            ROOT_PARTITON=p1
+        fi
+
         # kpartx fails if no /dev/loop* exists, "losetup -f" prints first unused
         # loop device and creates it if it doesn't exist
         sudo losetup -f
+
         # XXX: Parsing stdout is dangerous, would like a better way to discover
         #      the device used for the image.
-        # NOTE: On F17 (parted-3.0-10.fc17.x86_64), partprobe of
+        ROOT_LOOPDEV=$(sudo kpartx -av $WORKING/$RAW_FILE | \
-        #       /dev/loop0 does not create /dev/loop0p2, while kpartx at
+            awk "/loop[0-9]+$ROOT_PARTITON/ {print \$3}")
-        #       least creates /dev/mapper/loop0p2.
+        if ! timeout 5 sh -c "while ! [ -e /dev/mapper/$ROOT_LOOPDEV ]; do sleep 1; done"; then
-        LOOPDEV=$(sudo kpartx -av $WORKING/$RAW_FILE | awk "/loop[0-9]+$MAGIC_BIT/ {print \$3}")
+            echo "Error: Could not find /dev/mapper/$ROOT_LOOPDEV"
-        if ! timeout 5 sh -c "while ! [ -e /dev/mapper/$LOOPDEV ]; do sleep 1; done"; then
-            echo "Error: Could not find /dev/mapper/$LOOPDEV"
             exit 1
         fi
         EACTION="sudo kpartx -d $WORKING/$RAW_FILE ; $EACTION"
         trap "$EACTION" EXIT
         mkdir $WORKING/mnt
-        sudo mount /dev/mapper/$LOOPDEV $WORKING/mnt
+        sudo mount /dev/mapper/$ROOT_LOOPDEV $WORKING/mnt
         EACTION="sudo umount -f $WORKING/mnt ; $EACTION"
         trap "$EACTION" EXIT
+
+        # need to copy the contents of /boot into the image too, so
+        # mount it
+        if [[ $DISTRO_NAME = "centos7" ]]; then
+            BOOT_LOOPDEV=${ROOT_LOOPDEV/p3/p1}
+            sudo mount /dev/mapper/$BOOT_LOOPDEV $WORKING/mnt/boot
+            EACTION="sudo umount -f $WORKING/mnt/boot ; $EACTION"
+            trap "$EACTION" EXIT
+        fi
+
         # Chroot in so that we get the correct uid/gid
         sudo chroot $WORKING/mnt bin/tar -cz . > $WORKING/tmp.tar
         mv $WORKING/tmp.tar $CACHED_TAR

elements/vm/finalise.d/51-bootloader

@@ -113,7 +113,7 @@ function install_grub2 {
             sed -i -e 's/\(^GRUB_CMDLINE_LINUX.*\)"$/\1 nofb nomodeset vga=normal"/' /etc/default/grub
             GRUB_MKCONFIG=update-grub
         ;;
-        'Fedora')
+        'Fedora'|'CentOS')
             echo 'GRUB_CMDLINE_LINUX="nofb nomodeset vga=normal"' >>/etc/default/grub
         ;;
         'openSUSE project')