adding IMAGE_URL breaks stack.sh

[Gavin B]

If you add something like :

IMAGE_URLS+=",http://uec-images.ubuntu.com/raring/current/raring-server-cloudimg-amd64.tar.gz"

to your localrc file, things don't work as you'd expect. Rather than adding the new URL to a list containing the default image, it replaces the list with the new URL. This would be fine except that stack.sh seems to require the tty image (or something similar).
If it's not there you get :

++ errexit='set +o errexit'
++ set -o errexit
++ ifs='
'
++ declare -a images
++ read -r IMAGE_NAME IMAGE_UUID
+++ glance image-list --status=active
+++ awk '-F|' '!/^(+--)|ID|aki|ari/ { print $3,$2 }'
++ case "${#images[*]}" in
++ echo 'Found no valid images to use!'
Found no valid images to use!
++ exit 1
+ clean
+ local r=1
++ jobs -p
+ kill

ubuntu@gbdevonly:~/devstack$ glance image-list
+--------------------------------------+-------------------------------------+-------------+------------------+------------+--------+
| ID | Name | Disk Format | Container Format | Size | Status |
+--------------------------------------+-------------------------------------+-------------+------------------+------------+--------+
| b81f68c0-55b2-4e2a-b1d1-8e1a10700bd6 | raring-server-cloudimg-amd64 | ami | ami | 1476395008 | active |
| 845e9352-535c-4c94-bd0c-6627abeb556b | raring-server-cloudimg-amd64-kernel | aki | aki | 5391024 | active |
| 04bc6c61-9a72-434c-a173-434eb8770699 | tty | ami | ami | 25165824 | active |
| 25764d23-8644-4048-a7b4-2976fb8223d3 | tty-kernel | aki | aki | 4404752 | active |
| 98cb72d1-3892-449e-9aec-f74d70050c66 | tty-ramdisk | ari | ari | 5882349 | active |
+--------------------------------------+-------------------------------------+-------------+------------------+------------+--------+

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/143113

[OpenStack Infra (hudson-openstack)]

Change abandoned by Ian Wienand (<email address hidden>) on branch: master
Review: https://review.openstack.org/143113
Reason: Lets try and fix both bugs in I3ca4e576aa3fb8992c08ca44900a8c53dd4b4163

[Sean Dague (sdague)]

This devstack bug was last updated over 180 days ago, as devstack
is a fast moving project and we'd like to get the tracker down to
currently actionable bugs, this is getting marked as Invalid. If the
issue still exists, please feel free to reopen it.