From a8312db74245334f4ceeda07dd731da44799ff66 Mon Sep 17 00:00:00 2001
From: Chris Jones <cmsj@tenshu.net>
Date: Fri, 12 Apr 2013 14:41:32 +0100
Subject: [PATCH] Migrate cloud image URL/Release options to DIB_.

This switches $CLOUD_IMAGES and $RELEASE to the DIB_ namespace so
they will survive future changes to the sanitisation of the build
environment.

Change-Id: I7dc2aa82fb9ef452705b080cc404f41046014f20
---
 elements/fedora/README.md                      |  7 +++++++
 elements/fedora/root.d/10-fedora-cloud-image   | 10 +++++-----
 elements/ubuntu/README.md                      |  7 +++++++
 elements/ubuntu/root.d/10-cache-ubuntu-tarball | 14 +++++++-------
 4 files changed, 26 insertions(+), 12 deletions(-)

diff --git a/elements/fedora/README.md b/elements/fedora/README.md
index 4953b447..be2c0762 100644
--- a/elements/fedora/README.md
+++ b/elements/fedora/README.md
@@ -1 +1,8 @@
 Use Fedora cloud images as the baseline for built disk images.
+
+Overrides:
+
+ * To use a non-default URL for downloading base Fedora cloud images,
+   use the environment variable DIB\_CLOUD\_IMAGES
+ * To download a non-default release of Fedora cloud images, use the
+   environment variable DIB\_RELEASE
diff --git a/elements/fedora/root.d/10-fedora-cloud-image b/elements/fedora/root.d/10-fedora-cloud-image
index cdfcb17a..3b39eef9 100755
--- a/elements/fedora/root.d/10-fedora-cloud-image
+++ b/elements/fedora/root.d/10-fedora-cloud-image
@@ -10,16 +10,16 @@ if [ 'amd64' = "$ARCH" ] ; then
 fi
 
 IMG_PATH=~/.cache/image-create
-CLOUD_IMAGES=${CLOUD_IMAGES:-http://mattdm.fedorapeople.org/cloud-images/}
-RELEASE=${RELEASE:-Fedora18}
-BASE_IMAGE_FILE=${BASE_IMAGE_FILE:-$RELEASE-Cloud-$ARCH-latest.raw.tar.xz}
-BASE_IMAGE_TAR=$RELEASE-Cloud-$ARCH-latest.tgz
+DIB_CLOUD_IMAGES=${DIB_CLOUD_IMAGES:-http://mattdm.fedorapeople.org/cloud-images/}
+DIB_RELEASE=${DIB_RELEASE:-Fedora18}
+BASE_IMAGE_FILE=${BASE_IMAGE_FILE:-$DIB_RELEASE-Cloud-$ARCH-latest.raw.tar.xz}
+BASE_IMAGE_TAR=$DIB_RELEASE-Cloud-$ARCH-latest.tgz
 
 mkdir -p $IMG_PATH
 # TODO: don't cache forever.
 if [ ! -f $IMG_PATH/$BASE_IMAGE_FILE ] ; then
    echo "Fetching Base Image"
-   wget $CLOUD_IMAGES/$BASE_IMAGE_FILE -O $IMG_PATH/$BASE_IMAGE_FILE.tmp
+   wget $DIB_CLOUD_IMAGES/$BASE_IMAGE_FILE -O $IMG_PATH/$BASE_IMAGE_FILE.tmp
    mv $IMG_PATH/$BASE_IMAGE_FILE.tmp $IMG_PATH/$BASE_IMAGE_FILE
 fi
 if [ ! -f $IMG_PATH/$BASE_IMAGE_TAR ] ; then
diff --git a/elements/ubuntu/README.md b/elements/ubuntu/README.md
index 6c6e90b4..9c08bd75 100644
--- a/elements/ubuntu/README.md
+++ b/elements/ubuntu/README.md
@@ -1 +1,8 @@
 Use Ubuntu cloud images as the baseline for built disk images.
+
+Overrides:
+
+ * To use a non-default URL for downloading base Ubuntu cloud images,
+   use the environment variable DIB\_CLOUD\_IMAGES
+ * To download a non-default release of Ubuntu cloud images, use the
+   environment variable DIB\_RELEASE
diff --git a/elements/ubuntu/root.d/10-cache-ubuntu-tarball b/elements/ubuntu/root.d/10-cache-ubuntu-tarball
index afd110bd..a03fafe4 100755
--- a/elements/ubuntu/root.d/10-cache-ubuntu-tarball
+++ b/elements/ubuntu/root.d/10-cache-ubuntu-tarball
@@ -7,19 +7,19 @@ set -e
 [ -n "$TARGET_ROOT" ]
 
 IMG_PATH=~/.cache/image-create
-CLOUD_IMAGES=${CLOUD_IMAGES:-http://cloud-images.ubuntu.com/}
-RELEASE=${RELEASE:-quantal}
-BASE_IMAGE_FILE=${BASE_IMAGE_FILE:-$RELEASE-server-cloudimg-$ARCH-root.tar.gz}
-SHA256SUMS=${SHA256SUMS:-https://cloud-images.ubuntu.com/$RELEASE/current/SHA256SUMS}
+DIB_CLOUD_IMAGES=${DIB_CLOUD_IMAGES:-http://cloud-images.ubuntu.com/}
+DIB_RELEASE=${DIB_RELEASE:-quantal}
+BASE_IMAGE_FILE=${BASE_IMAGE_FILE:-$DIB_RELEASE-server-cloudimg-$ARCH-root.tar.gz}
+SHA256SUMS=${SHA256SUMS:-https://${DIB_CLOUD_IMAGES##http?(s)://}/$DIB_RELEASE/current/SHA256SUMS}
 
 mkdir -p $IMG_PATH
 # TODO: don't cache -current forever.
 if [ ! -f $IMG_PATH/$BASE_IMAGE_FILE ] ; then
    echo "Fetching Base Image"
-   wget $SHA256SUMS -O $IMG_PATH/SHA256SUMS.ubuntu.$RELEASE.$ARCH
-   wget $CLOUD_IMAGES/$RELEASE/current/$BASE_IMAGE_FILE -O $IMG_PATH/$BASE_IMAGE_FILE.tmp
+   wget $SHA256SUMS -O $IMG_PATH/SHA256SUMS.ubuntu.$DIB_RELEASE.$ARCH
+   wget $DIB_CLOUD_IMAGES/$DIB_RELEASE/current/$BASE_IMAGE_FILE -O $IMG_PATH/$BASE_IMAGE_FILE.tmp
    pushd $IMG_PATH
-   awk "/$BASE_IMAGE_FILE/ { print \$0 \".tmp\" }" SHA256SUMS.ubuntu.$RELEASE.$ARCH | sha256sum --check -
+   awk "/$BASE_IMAGE_FILE/ { print \$0 \".tmp\" }" SHA256SUMS.ubuntu.$DIB_RELEASE.$ARCH | sha256sum --check -
    popd
    mv $IMG_PATH/$BASE_IMAGE_FILE.tmp $IMG_PATH/$BASE_IMAGE_FILE
 fi