Merge "Add centos7 support for DIB_DISTRIBUTION_MIRROR"

elements/centos7/README.rst

@@ -4,3 +4,11 @@ centos7
 Use Centos 7 cloud images as the baseline for built disk images.
 
 For further details see the redhat-common README.
+
+DIB_DISTRIBUTION_MIRROR:
+   :Required: No
+   :Default: None
+   :Description: To use a CentOS Yum mirror, set this variable to the mirror URL
+                 before running bin/disk-image-create. This URL should point to
+                 the directory containing the ``5/6/7`` directories.
+   :Example: ``DIB\_DISTRIBUTION\_MIRROR=http://amirror.com/centos``

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

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+if [ ${DIB_DEBUG_TRACE:-0} -gt 0 ]; then
+    set -x
+fi
+set -eu
+set -o pipefail
+
+DIB_DISTRIBUTION_MIRROR=${DIB_DISTRIBUTION_MIRROR:-}
+
+[ -n "$DIB_DISTRIBUTION_MIRROR" ] || exit 0
+
+# Only set the mirror for the Base, Extras and Updates repositories
+# The others arn't enabled and do not exist on all mirrors
+sed -e "s|^#baseurl=http://mirror.centos.org/centos|baseurl=$DIB_DISTRIBUTION_MIRROR|;/^mirrorlist=/d" -i /etc/yum.repos.d/CentOS-Base.repo