CentOS 6 Element

This is the centos element, which builds CentOS 6.

There are a couple of modifications to redhat-common because
the version of tar in el6 doesn't support --xattrs-include.

There is a change to both pkg-map and svc-map to add 'centos'
to the 'redhat' family.

Also explicitly have to install cloud-utils growroot and
dracut growpart for proper fsresize at instance launch.

Also sets the DIB_EXTLINUX variable because there is no grub2
for this distro.

Change-Id: Iffd57bce1484c43c2cffcbdb37b602185216e63a

elements/centos/README.rst

@@ -0,0 +1,6 @@
+======
+centos
+======
+Use Centos 6 cloud images as the baseline for built disk images.
+
+For further details see the redhat-common README.

elements/centos/element-deps

@@ -0,0 +1,5 @@
+cache-url
+dib-run-parts
+redhat-common
+rpm-distro
+yum

elements/centos/element-provides

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

elements/centos/environment.d/00-bootloader.bash

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+if [ "${DIB_DEBUG_TRACE:-0}" -gt 0 ]; then
+    set -x
+fi
+set -eu
+set -o pipefail
+
+export DIB_EXTLINUX=1

elements/centos/environment.d/10-centos6-distro-name.bash

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

elements/centos/package-installs.yaml

@@ -0,0 +1,4 @@
+parted:
+cloud-utils:
+cloud-utils-growpart:
+dracut-modules-growpart:

elements/centos/pre-install.d/02-yum-repos

@@ -0,0 +1,25 @@
+#!/bin/bash
+
+if [ "${DIB_DEBUG_TRACE:-0}" -gt 0 ]; then
+    set -x
+fi
+set -eu
+set -o pipefail
+
+cat << EOF > /etc/yum.repos.d/centos6-latest.repo
+[rhel6]
+name=centos6
+baseurl=http://mirror.centos.org/centos/6/os/x86_64/
+enabled=1
+metadata_expire=7d
+gpgcheck=0
+EOF
+
+cat << EOF > /etc/yum.repos.d/epel.repo
+[epel]
+name=Extra Packages for Enterprise Linux 6 - \$basearch
+mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-6&arch=\$basearch
+failovermethod=priority
+enabled=1
+gpgcheck=0
+EOF

elements/centos/root.d/10-centos6-cloud-image

@@ -0,0 +1,34 @@
+#!/bin/bash
+
+if [ "${DIB_DEBUG_TRACE:-0}" -gt 0 ]; then
+    set -x
+fi
+set -eu
+set -o pipefail
+
+[ -n "$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=${DIB_RELEASE:-GenericCloud-20141129_01}
+    DIB_CLOUD_IMAGES=${DIB_CLOUD_IMAGES:-http://cloud.centos.org/centos/6/images}
+    BASE_IMAGE_FILE=${BASE_IMAGE_FILE:-CentOS-6-x86_64-$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/pkg-map/bin/pkg-map

@@ -27,7 +27,7 @@ def eprint(msg):
 
 def os_family(distro):
     family = None
-    if distro in ['fedora', 'rhel', 'rhel7', 'centos7']:
+    if distro in ['fedora', 'rhel', 'rhel7', 'centos', 'centos7']:
         family = 'redhat'
     elif distro in ['debian', 'ubuntu']:
         family = 'debian'

elements/redhat-common/bin/extract-image

@@ -78,8 +78,14 @@ function extract_image() {
             EACTION="sudo umount -f $WORKING/mnt ; $EACTION"
             trap "$EACTION" EXIT
 
+            # find out if chroot tar has full xattr support
+            if [ 0 == `sudo chroot $WORKING/mnt bin/tar --help | grep -c xattrs-exclude` ]; then
+                TAROPTS="--no-xattrs"
+            else
+                TAROPTS="--xattrs --xattrs-include='*' --xattrs-exclude='security.selinux'"
+            fi
             # Chroot in so that we get the correct uid/gid
-            sudo chroot $WORKING/mnt bin/tar --xattrs --xattrs-include='*' --xattrs-exclude='security.selinux' -cz . > $WORKING/tmp.tar
+            sudo chroot $WORKING/mnt bin/tar $TAROPTS -cz . > $WORKING/tmp.tar
             mv $WORKING/tmp.tar $CACHED_TAR
         else
             echo "Using cached tar from $CACHED_TAR"

elements/redhat-common/pre-install.d/15-remove-grub

@@ -1,13 +1,21 @@
 #!/bin/bash
-
-if [ ${DIB_DEBUG_TRACE:-0} -gt 0 ]; then
+if [ "${DIB_DEBUG_TRACE:-0}" -gt 0 ]; then
     set -x
 fi
 set -eu
 set -o pipefail
 
+GRUBNAME=$(which grub-install) || echo "trying grub2-install"
+if [ -z "$GRUBNAME" ]; then
+    GRUBNAME=$(which grub2-install)
+fi
+if [ -z "$GRUBNAME" ] || [ $($GRUBNAME --version | grep -c "0.97") -ne 0 ]; then
+    echo "No GRUB2 found. No need to remove"
+    exit 0
+else
 # Must manually remove grub2 here, otherwise the download below does not work.
-yum remove -y grub2
+    yum remove -y grub2
+fi
 
 # Remove all old versions of grub2 from the yum cache and then ensure the
 # latest version is in the cache.

elements/svc-map/extra-data.d/10-merge-svc-map-files

@@ -21,7 +21,7 @@ import yaml
 def os_family(distro):
     "Given a distribution, returns a operating system family."
     family = None
-    if distro in ['centos7', 'fedora', 'rhel', 'rhel7']:
+    if distro in ['centos', 'centos7', 'fedora', 'rhel', 'rhel7']:
         family = 'redhat'
     elif distro in ['debian', 'ubuntu']:
         family = 'debian'