Element for building previous releases of CentOS 7

README.rst

@@ -28,3 +28,4 @@ This repository provides the following DIB elements:
   Ironic Python Agent (IPA) ramdisk image.
 * ``nvidia-cuda``: Installs Nvidia CUDA repo and packages for GPU support.
 * ``centos-linkup-extra``: Allows extra time for slow network links to come up.
+* ``centos7-vault``: Deploy older releases of CentOS 7

elements/centos7-vault/README.rst

@@ -0,0 +1,47 @@
+=============
+centos7-vault
+=============
+
+Based on the standard centos7 element with minimal changes.
+
+Use previous (but still available) versions of CentOS 7 cloud images as
+the baseline for built disk images.
+
+DIB_CENTOS7_VERSION:
+  :Required: No
+  :Default: 7.6
+  :Description: Set a version, from 7.1 to 7.7 (inclusive) and the last-known
+                public locations for package repos and cloud images will be used.
+
+DIB_CENTOS7_MIRROR_VERSION:
+  :Required: No
+  :Default: 7.6.1810
+  :Description: Set a fully-qualified version for a build of CentOS.
+                A sensible last-known default value is set according to 
+                ``DIB_CENTOS7_VERSION``.  This value also overwrites
+                ``$releasever`` in a standard ``CentOS-Base`` yum repo.
+
+DIB_CENTOS7_CLOUDIMAGE_VERSION:
+  :Required: No
+  :Default: GenericCloud-1811
+  :Description: Set a fully-qualified version for a cloud image build.
+                A sensible last-known default value is set according to 
+                ``DIB_CENTOS7_VERSION``.
+
+DIB_CENTOS7_MIRROR:
+  :Required: No
+  :Default: ``http://vault.centos.org``
+  :Description: A default value is the CentOS vault repo URL.
+                It must have a subdirectory which is the CentOS mirror version.
+  :Example: ``DIB_DISTRIBUTION_MIRROR=http://mirror.local/centos``
+
+DIB_CENTOS7_CLOUDIMAGE_REPO:
+  :Required: No
+  :Default: ``https://cloud.centos.org/centos/7/images``
+  :Description: URL to a folder for fetching the cloud image.
+
+DIB_CENTOS7_CLOUDIMAGE:
+  :Required: No
+  :Default: ``https://cloud.centos.org/centos/7/images/CentOS-7-x86_64-$DIB_CENTOS7_CLOUDIMAGE_VERSION.qcow2.xz``
+  :Description: Set the desired fully-qualified URL to fetch the cloud image from.
+  :Example: ``DIB_CLOUD_IMAGES=/path/to/my/centos/7/CentOS-7-x86_64-GenericCloud.qcow2.xz``

elements/centos7-vault/element-deps

@@ -0,0 +1,5 @@
+cache-url
+redhat-common
+rpm-distro
+source-repositories
+yum

elements/centos7-vault/element-provides

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

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

@@ -0,0 +1,62 @@
+export DISTRO_NAME=centos7
+export DIB_RELEASE=7
+
+# Useful for elements that work with fedora (dnf) & centos
+export YUM=${YUM:-yum}
+
+# At the time of writing CentOS 7.7 is still current and the vault content is incomplete.
+export DIB_CENTOS7_VERSION=${DIB_CENTOS7_VERSION:-"7.6"}
+case "$DIB_CENTOS7_VERSION" in
+    7.7)
+        DIB_CENTOS7_MIRROR_VERSION=${DIB_CENTOS7_MIRROR_VERSION:-"7.7.1908"}
+        DIB_CENTOS7_CLOUDIMAGE_VERSION=${DIB_CENTOS7_CLOUDIMAGE_VERSION:-"GenericCloud-1907"}
+        ;;
+    7.6)
+        DIB_CENTOS7_MIRROR_VERSION=${DIB_CENTOS7_MIRROR_VERSION:-"7.6.1810"}
+        DIB_CENTOS7_CLOUDIMAGE_VERSION=${DIB_CENTOS7_CLOUDIMAGE_VERSION:-"GenericCloud-1811"}
+        ;;
+    7.5)
+        DIB_CENTOS7_MIRROR_VERSION=${DIB_CENTOS7_MIRROR_VERSION:-"7.5.1804"}
+        DIB_CENTOS7_CLOUDIMAGE_VERSION=${DIB_CENTOS7_CLOUDIMAGE_VERSION:-"GenericCloud-1805"}
+        ;;
+    7.4)
+        DIB_CENTOS7_MIRROR_VERSION=${DIB_CENTOS7_MIRROR_VERSION:-"7.4.1708"}
+        DIB_CENTOS7_CLOUDIMAGE_VERSION=${DIB_CENTOS7_CLOUDIMAGE_VERSION:-"GenericCloud-1708"}
+        ;;
+    7.3)
+        DIB_CENTOS7_MIRROR_VERSION=${DIB_CENTOS7_MIRROR_VERSION:-"7.3.1611"}
+        DIB_CENTOS7_CLOUDIMAGE_VERSION=${DIB_CENTOS7_CLOUDIMAGE_VERSION:-"GenericCloud-1611"}
+        ;;
+    7.2)
+        DIB_CENTOS7_MIRROR_VERSION=${DIB_CENTOS7_MIRROR_VERSION:-"7.2.1511"}
+        DIB_CENTOS7_CLOUDIMAGE_VERSION=${DIB_CENTOS7_CLOUDIMAGE_VERSION:-"GenericCloud-1511"}
+        ;;
+    7.1)
+        DIB_CENTOS7_MIRROR_VERSION=${DIB_CENTOS7_MIRROR_VERSION:-"7.1.1503"}
+        DIB_CENTOS7_CLOUDIMAGE_VERSION=${DIB_CENTOS7_CLOUDIMAGE_VERSION:-"GenericCloud-1503"}
+        ;;
+    *)
+        echo "CentOS 7 version \"$DIB_CENTOS7_VERSION\" is not recognised"
+        exit -1
+        ;;
+esac
+export DIB_CENTOS7_MIRROR_VERSION DIB_CENTOS7_CLOUDIMAGE_VERSION
+
+[ -n "$ARCH" ]
+
+if [[ "amd64 x86_64" =~ "$ARCH" ]]; then
+    ARCH="x86_64"
+    export DIB_CENTOS7_CLOUDIMAGE_REPO=${DIB_CENTOS7_CLOUDIMAGE_REPO:-"https://cloud.centos.org/centos/7/images"}
+elif [[ "arm64 aarch64" =~ "$ARCH" ]]; then
+    ARCH="aarch64"
+    export DIB_CENTOS7_CLOUDIMAGE_REPO=${DIB_CENTOS7_CLOUDIMAGE_REPO:-http://cloud.centos.org/altarch/7/images/aarch64}
+elif [[ "ppc64le" =~ "$ARCH" ]]; then
+    export DIB_CENTOS7_CLOUDIMAGE_REPO=${DIB_CENTOS7_CLOUDIMAGE_REPO:-http://cloud.centos.org/altarch/7/images/ppc64le}
+else
+    echo 'centos7-vault root element only supports the x86_64, aarch64 and ppc64le values for $ARCH'
+    exit -2
+fi
+
+export DIB_CENTOS7_MIRROR=${DIB_CENTOS7_MIRROR:-"http://vault.centos.org"}
+export DIB_CENTOS7_CLOUDIMAGE_FILE=${DIB_CENTOS7_CLOUDIMAGE_FILE:-CentOS-7-${ARCH}-${DIB_CENTOS7_CLOUDIMAGE_VERSION}.qcow2.xz}
+export DIB_CENTOS7_CLOUDIMAGE=${DIB_CENTOS7_CLOUDIMAGE:-${DIB_CENTOS7_CLOUDIMAGE_REPO}/${DIB_CENTOS7_CLOUDIMAGE_FILE}}

elements/centos7-vault/pre-install.d/01-set-centos-mirror

@@ -0,0 +1,24 @@
+#!/bin/bash
+
+if [ ${DIB_DEBUG_TRACE:-0} -gt 0 ]; then
+    set -x
+fi
+set -eu
+set -o pipefail
+
+
+# Only set the mirror for the Base, Extras, Updates and CentOSPlus repositories
+# This assumes a fair amount about the structure of the CentOS-Base repo file.
+# Would be nice to use -E "s/^\[(base|updates|extras|centosplus)\]/\[\1_$DIB_CENTOS7_MIRROR_VERSION\]/g"
+
+sed -e "s|^#baseurl=http[s]*://mirror.centos.org/centos|baseurl=$DIB_CENTOS7_MIRROR|" \
+    -e "/^mirrorlist=/d" \
+    -e "s/^\[base\]/\[base_$DIB_CENTOS7_MIRROR_VERSION\]/g" \
+    -e "s/^\[updates\]/\[updates_$DIB_CENTOS7_MIRROR_VERSION\]/g" \
+    -e "s/^\[extras\]/\[extras_$DIB_CENTOS7_MIRROR_VERSION\]/g" \
+    -e "s/^\[centosplus\]/\[centosplus_$DIB_CENTOS7_MIRROR_VERSION\]/g" \
+    -e "s/\$releasever\>/$DIB_CENTOS7_MIRROR_VERSION/g" /etc/yum.repos.d/CentOS-Base.repo > /etc/yum.repos.d/CentOS-Vault.repo
+
+yum clean all
+yum-config-manager --disable base updates extras centosplus
+yum-config-manager --enable {base,updates,extras,centosplus}_$DIB_CENTOS7_MIRROR_VERSION

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

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+if [ ${DIB_DEBUG_TRACE:-0} -gt 0 ]; then
+    set -x
+fi
+set -eu
+set -o pipefail
+
+[ -n "$TARGET_ROOT" ]
+
+DIB_LOCAL_IMAGE=${DIB_LOCAL_IMAGE:-}
+
+if [ -n "$DIB_LOCAL_IMAGE" ]; then
+    # No need to copy a local image into the cache directory, so just specify
+    # the cached path as the original path.
+    CACHED_IMAGE=$DIB_CENTOS7_CLOUDIMAGE
+else
+    CACHED_IMAGE=$DIB_IMAGE_CACHE/$DIB_CENTOS7_CLOUDIMAGE_FILE
+fi
+
+BASE_IMAGE_TAR=$DIB_CENTOS7_CLOUDIMAGE_FILE.tgz
+
+$TMP_HOOKS_PATH/bin/extract-image $DIB_CENTOS7_CLOUDIMAGE_FILE $BASE_IMAGE_TAR $DIB_CENTOS7_CLOUDIMAGE $CACHED_IMAGE

elements/centos7-vault/test-elements/build-succeeds/element-deps

@@ -0,0 +1,3 @@
+base
+epel
+openstack-ci-mirrors