Centralize setting default branch for stable branching

One of the steps when we create a new stable branch is to
branch devstack, then update the default branch for most
repos to use the new stable branch for each repo.

This requires making multiple updates throughout stackrc,
and to further complicate things, there are some repo
branch variables for branchless repos that should not be
updated along with the others.

This can be error prone if not fully aware of these
exceptions. To simplify this process a little, this
patch adds two common variables - one that can be set to
the new stable branch name for all of the repos that
should be branched, and one that can be used for all of
the branchless repos to make it explicit that those
values should be left alone. The cycle-trailing repos
have until two weeks after final release to branch, so
also adding another variable for those to make it easy
to update them at a later time, separately from the
other repos.

Change-Id: I82aa19e739eeda3721bac1cb5153ad0bf2d1125a
diff --git a/stackrc b/stackrc
index c243d27..b7105d3 100644
--- a/stackrc
+++ b/stackrc
@@ -13,6 +13,18 @@
 # Source required DevStack functions and globals
 source $RC_DIR/functions
 
+# Set the target branch. This is used so that stable branching
+# does not need to update each repo below.
+TARGET_BRANCH=master
+
+# Cycle trailing projects need to branch later than the others.
+TRAILING_TARGET_BRANCH=master
+
+# And some repos do not create stable branches, so this is used
+# to make it explicit and avoid accidentally setting to a stable
+# branch.
+BRANCHLESS_TARGET_BRANCH=master
+
 # Destination path for installation
 DEST=/opt/stack
 
@@ -256,35 +268,35 @@
 
 # block storage service
 CINDER_REPO=${CINDER_REPO:-${GIT_BASE}/openstack/cinder.git}
-CINDER_BRANCH=${CINDER_BRANCH:-master}
+CINDER_BRANCH=${CINDER_BRANCH:-$TARGET_BRANCH}
 
 # image catalog service
 GLANCE_REPO=${GLANCE_REPO:-${GIT_BASE}/openstack/glance.git}
-GLANCE_BRANCH=${GLANCE_BRANCH:-master}
+GLANCE_BRANCH=${GLANCE_BRANCH:-$TARGET_BRANCH}
 
 # django powered web control panel for openstack
 HORIZON_REPO=${HORIZON_REPO:-${GIT_BASE}/openstack/horizon.git}
-HORIZON_BRANCH=${HORIZON_BRANCH:-master}
+HORIZON_BRANCH=${HORIZON_BRANCH:-$TARGET_BRANCH}
 
 # unified auth system (manages accounts/tokens)
 KEYSTONE_REPO=${KEYSTONE_REPO:-${GIT_BASE}/openstack/keystone.git}
-KEYSTONE_BRANCH=${KEYSTONE_BRANCH:-master}
+KEYSTONE_BRANCH=${KEYSTONE_BRANCH:-$TARGET_BRANCH}
 
 # neutron service
 NEUTRON_REPO=${NEUTRON_REPO:-${GIT_BASE}/openstack/neutron.git}
-NEUTRON_BRANCH=${NEUTRON_BRANCH:-master}
+NEUTRON_BRANCH=${NEUTRON_BRANCH:-$TARGET_BRANCH}
 
 # neutron fwaas service
 NEUTRON_FWAAS_REPO=${NEUTRON_FWAAS_REPO:-${GIT_BASE}/openstack/neutron-fwaas.git}
-NEUTRON_FWAAS_BRANCH=${NEUTRON_FWAAS_BRANCH:-master}
+NEUTRON_FWAAS_BRANCH=${NEUTRON_FWAAS_BRANCH:-$TARGET_BRANCH}
 
 # compute service
 NOVA_REPO=${NOVA_REPO:-${GIT_BASE}/openstack/nova.git}
-NOVA_BRANCH=${NOVA_BRANCH:-master}
+NOVA_BRANCH=${NOVA_BRANCH:-$TARGET_BRANCH}
 
 # object storage service
 SWIFT_REPO=${SWIFT_REPO:-${GIT_BASE}/openstack/swift.git}
-SWIFT_BRANCH=${SWIFT_BRANCH:-master}
+SWIFT_BRANCH=${SWIFT_BRANCH:-$TARGET_BRANCH}
 
 ##############
 #
@@ -294,11 +306,11 @@
 
 # consolidated openstack requirements
 REQUIREMENTS_REPO=${REQUIREMENTS_REPO:-${GIT_BASE}/openstack/requirements.git}
-REQUIREMENTS_BRANCH=${REQUIREMENTS_BRANCH:-master}
+REQUIREMENTS_BRANCH=${REQUIREMENTS_BRANCH:-$TARGET_BRANCH}
 
 # Tempest test suite
 TEMPEST_REPO=${TEMPEST_REPO:-${GIT_BASE}/openstack/tempest.git}
-TEMPEST_BRANCH=${TEMPEST_BRANCH:-master}
+TEMPEST_BRANCH=${TEMPEST_BRANCH:-$BRANCHLESS_TARGET_BRANCH}
 
 
 ##############
@@ -310,56 +322,56 @@
 
 # volume client
 GITREPO["python-cinderclient"]=${CINDERCLIENT_REPO:-${GIT_BASE}/openstack/python-cinderclient.git}
-GITBRANCH["python-cinderclient"]=${CINDERCLIENT_BRANCH:-master}
+GITBRANCH["python-cinderclient"]=${CINDERCLIENT_BRANCH:-$TARGET_BRANCH}
 
 # os-brick client for local volume attachement
 GITREPO["python-brick-cinderclient-ext"]=${BRICK_CINDERCLIENT_REPO:-${GIT_BASE}/openstack/python-brick-cinderclient-ext.git}
-GITBRANCH["python-brick-cinderclient-ext"]=${BRICK_CINDERCLIENT_BRANCH:-master}
+GITBRANCH["python-brick-cinderclient-ext"]=${BRICK_CINDERCLIENT_BRANCH:-$TARGET_BRANCH}
 
 # python barbican client library
 GITREPO["python-barbicanclient"]=${BARBICANCLIENT_REPO:-${GIT_BASE}/openstack/python-barbicanclient.git}
-GITBRANCH["python-barbicanclient"]=${BARBICANCLIENT_BRANCH:-master}
+GITBRANCH["python-barbicanclient"]=${BARBICANCLIENT_BRANCH:-$TARGET_BRANCH}
 GITDIR["python-barbicanclient"]=$DEST/python-barbicanclient
 
 # python glance client library
 GITREPO["python-glanceclient"]=${GLANCECLIENT_REPO:-${GIT_BASE}/openstack/python-glanceclient.git}
-GITBRANCH["python-glanceclient"]=${GLANCECLIENT_BRANCH:-master}
+GITBRANCH["python-glanceclient"]=${GLANCECLIENT_BRANCH:-$TARGET_BRANCH}
 
 # ironic client
 GITREPO["python-ironicclient"]=${IRONICCLIENT_REPO:-${GIT_BASE}/openstack/python-ironicclient.git}
-GITBRANCH["python-ironicclient"]=${IRONICCLIENT_BRANCH:-master}
+GITBRANCH["python-ironicclient"]=${IRONICCLIENT_BRANCH:-$TARGET_BRANCH}
 # ironic plugin is out of tree, but nova uses it. set GITDIR here.
 GITDIR["python-ironicclient"]=$DEST/python-ironicclient
 
 # the base authentication plugins that clients use to authenticate
 GITREPO["keystoneauth"]=${KEYSTONEAUTH_REPO:-${GIT_BASE}/openstack/keystoneauth.git}
-GITBRANCH["keystoneauth"]=${KEYSTONEAUTH_BRANCH:-master}
+GITBRANCH["keystoneauth"]=${KEYSTONEAUTH_BRANCH:-$TARGET_BRANCH}
 
 # python keystone client library to nova that horizon uses
 GITREPO["python-keystoneclient"]=${KEYSTONECLIENT_REPO:-${GIT_BASE}/openstack/python-keystoneclient.git}
-GITBRANCH["python-keystoneclient"]=${KEYSTONECLIENT_BRANCH:-master}
+GITBRANCH["python-keystoneclient"]=${KEYSTONECLIENT_BRANCH:-$TARGET_BRANCH}
 
 # neutron client
 GITREPO["python-neutronclient"]=${NEUTRONCLIENT_REPO:-${GIT_BASE}/openstack/python-neutronclient.git}
-GITBRANCH["python-neutronclient"]=${NEUTRONCLIENT_BRANCH:-master}
+GITBRANCH["python-neutronclient"]=${NEUTRONCLIENT_BRANCH:-$TARGET_BRANCH}
 
 # python client library to nova that horizon (and others) use
 GITREPO["python-novaclient"]=${NOVACLIENT_REPO:-${GIT_BASE}/openstack/python-novaclient.git}
-GITBRANCH["python-novaclient"]=${NOVACLIENT_BRANCH:-master}
+GITBRANCH["python-novaclient"]=${NOVACLIENT_BRANCH:-$TARGET_BRANCH}
 
 # python swift client library
 GITREPO["python-swiftclient"]=${SWIFTCLIENT_REPO:-${GIT_BASE}/openstack/python-swiftclient.git}
-GITBRANCH["python-swiftclient"]=${SWIFTCLIENT_BRANCH:-master}
+GITBRANCH["python-swiftclient"]=${SWIFTCLIENT_BRANCH:-$TARGET_BRANCH}
 
 # consolidated openstack python client
 GITREPO["python-openstackclient"]=${OPENSTACKCLIENT_REPO:-${GIT_BASE}/openstack/python-openstackclient.git}
-GITBRANCH["python-openstackclient"]=${OPENSTACKCLIENT_BRANCH:-master}
+GITBRANCH["python-openstackclient"]=${OPENSTACKCLIENT_BRANCH:-$TARGET_BRANCH}
 # this doesn't exist in a lib file, so set it here
 GITDIR["python-openstackclient"]=$DEST/python-openstackclient
 
 # placement-api CLI
 GITREPO["osc-placement"]=${OSC_PLACEMENT_REPO:-${GIT_BASE}/openstack/osc-placement.git}
-GITBRANCH["osc-placement"]=${OSC_PLACEMENT_BRANCH:-master}
+GITBRANCH["osc-placement"]=${OSC_PLACEMENT_BRANCH:-$TARGET_BRANCH}
 
 
 ###################
@@ -371,119 +383,119 @@
 
 # castellan key manager interface
 GITREPO["castellan"]=${CASTELLAN_REPO:-${GIT_BASE}/openstack/castellan.git}
-GITBRANCH["castellan"]=${CASTELLAN_BRANCH:-master}
+GITBRANCH["castellan"]=${CASTELLAN_BRANCH:-$TARGET_BRANCH}
 
 # cliff command line framework
 GITREPO["cliff"]=${CLIFF_REPO:-${GIT_BASE}/openstack/cliff.git}
-GITBRANCH["cliff"]=${CLIFF_BRANCH:-master}
+GITBRANCH["cliff"]=${CLIFF_BRANCH:-$TARGET_BRANCH}
 
 # async framework/helpers
 GITREPO["futurist"]=${FUTURIST_REPO:-${GIT_BASE}/openstack/futurist.git}
-GITBRANCH["futurist"]=${FUTURIST_BRANCH:-master}
+GITBRANCH["futurist"]=${FUTURIST_BRANCH:-$TARGET_BRANCH}
 
 # debtcollector deprecation framework/helpers
 GITREPO["debtcollector"]=${DEBTCOLLECTOR_REPO:-${GIT_BASE}/openstack/debtcollector.git}
-GITBRANCH["debtcollector"]=${DEBTCOLLECTOR_BRANCH:-master}
+GITBRANCH["debtcollector"]=${DEBTCOLLECTOR_BRANCH:-$TARGET_BRANCH}
 
 # helpful state machines
 GITREPO["automaton"]=${AUTOMATON_REPO:-${GIT_BASE}/openstack/automaton.git}
-GITBRANCH["automaton"]=${AUTOMATON_BRANCH:-master}
+GITBRANCH["automaton"]=${AUTOMATON_BRANCH:-$TARGET_BRANCH}
 
 # oslo.cache
 GITREPO["oslo.cache"]=${OSLOCACHE_REPO:-${GIT_BASE}/openstack/oslo.cache.git}
-GITBRANCH["oslo.cache"]=${OSLOCACHE_BRANCH:-master}
+GITBRANCH["oslo.cache"]=${OSLOCACHE_BRANCH:-$TARGET_BRANCH}
 
 # oslo.concurrency
 GITREPO["oslo.concurrency"]=${OSLOCON_REPO:-${GIT_BASE}/openstack/oslo.concurrency.git}
-GITBRANCH["oslo.concurrency"]=${OSLOCON_BRANCH:-master}
+GITBRANCH["oslo.concurrency"]=${OSLOCON_BRANCH:-$TARGET_BRANCH}
 
 # oslo.config
 GITREPO["oslo.config"]=${OSLOCFG_REPO:-${GIT_BASE}/openstack/oslo.config.git}
-GITBRANCH["oslo.config"]=${OSLOCFG_BRANCH:-master}
+GITBRANCH["oslo.config"]=${OSLOCFG_BRANCH:-$TARGET_BRANCH}
 
 # oslo.context
 GITREPO["oslo.context"]=${OSLOCTX_REPO:-${GIT_BASE}/openstack/oslo.context.git}
-GITBRANCH["oslo.context"]=${OSLOCTX_BRANCH:-master}
+GITBRANCH["oslo.context"]=${OSLOCTX_BRANCH:-$TARGET_BRANCH}
 
 # oslo.db
 GITREPO["oslo.db"]=${OSLODB_REPO:-${GIT_BASE}/openstack/oslo.db.git}
-GITBRANCH["oslo.db"]=${OSLODB_BRANCH:-master}
+GITBRANCH["oslo.db"]=${OSLODB_BRANCH:-$TARGET_BRANCH}
 
 # oslo.i18n
 GITREPO["oslo.i18n"]=${OSLOI18N_REPO:-${GIT_BASE}/openstack/oslo.i18n.git}
-GITBRANCH["oslo.i18n"]=${OSLOI18N_BRANCH:-master}
+GITBRANCH["oslo.i18n"]=${OSLOI18N_BRANCH:-$TARGET_BRANCH}
 
 # oslo.log
 GITREPO["oslo.log"]=${OSLOLOG_REPO:-${GIT_BASE}/openstack/oslo.log.git}
-GITBRANCH["oslo.log"]=${OSLOLOG_BRANCH:-master}
+GITBRANCH["oslo.log"]=${OSLOLOG_BRANCH:-$TARGET_BRANCH}
 
 # oslo.messaging
 GITREPO["oslo.messaging"]=${OSLOMSG_REPO:-${GIT_BASE}/openstack/oslo.messaging.git}
-GITBRANCH["oslo.messaging"]=${OSLOMSG_BRANCH:-master}
+GITBRANCH["oslo.messaging"]=${OSLOMSG_BRANCH:-$TARGET_BRANCH}
 
 # oslo.middleware
 GITREPO["oslo.middleware"]=${OSLOMID_REPO:-${GIT_BASE}/openstack/oslo.middleware.git}
-GITBRANCH["oslo.middleware"]=${OSLOMID_BRANCH:-master}
+GITBRANCH["oslo.middleware"]=${OSLOMID_BRANCH:-$TARGET_BRANCH}
 
 # oslo.policy
 GITREPO["oslo.policy"]=${OSLOPOLICY_REPO:-${GIT_BASE}/openstack/oslo.policy.git}
-GITBRANCH["oslo.policy"]=${OSLOPOLICY_BRANCH:-master}
+GITBRANCH["oslo.policy"]=${OSLOPOLICY_BRANCH:-$TARGET_BRANCH}
 
 # oslo.privsep
 GITREPO["oslo.privsep"]=${OSLOPRIVSEP_REPO:-${GIT_BASE}/openstack/oslo.privsep.git}
-GITBRANCH["oslo.privsep"]=${OSLOPRIVSEP_BRANCH:-master}
+GITBRANCH["oslo.privsep"]=${OSLOPRIVSEP_BRANCH:-$TARGET_BRANCH}
 
 # oslo.reports
 GITREPO["oslo.reports"]=${OSLOREPORTS_REPO:-${GIT_BASE}/openstack/oslo.reports.git}
-GITBRANCH["oslo.reports"]=${OSLOREPORTS_BRANCH:-master}
+GITBRANCH["oslo.reports"]=${OSLOREPORTS_BRANCH:-$TARGET_BRANCH}
 
 # oslo.rootwrap
 GITREPO["oslo.rootwrap"]=${OSLORWRAP_REPO:-${GIT_BASE}/openstack/oslo.rootwrap.git}
-GITBRANCH["oslo.rootwrap"]=${OSLORWRAP_BRANCH:-master}
+GITBRANCH["oslo.rootwrap"]=${OSLORWRAP_BRANCH:-$TARGET_BRANCH}
 
 # oslo.serialization
 GITREPO["oslo.serialization"]=${OSLOSERIALIZATION_REPO:-${GIT_BASE}/openstack/oslo.serialization.git}
-GITBRANCH["oslo.serialization"]=${OSLOSERIALIZATION_BRANCH:-master}
+GITBRANCH["oslo.serialization"]=${OSLOSERIALIZATION_BRANCH:-$TARGET_BRANCH}
 
 # oslo.service
 GITREPO["oslo.service"]=${OSLOSERVICE_REPO:-${GIT_BASE}/openstack/oslo.service.git}
-GITBRANCH["oslo.service"]=${OSLOSERVICE_BRANCH:-master}
+GITBRANCH["oslo.service"]=${OSLOSERVICE_BRANCH:-$TARGET_BRANCH}
 
 # oslo.utils
 GITREPO["oslo.utils"]=${OSLOUTILS_REPO:-${GIT_BASE}/openstack/oslo.utils.git}
-GITBRANCH["oslo.utils"]=${OSLOUTILS_BRANCH:-master}
+GITBRANCH["oslo.utils"]=${OSLOUTILS_BRANCH:-$TARGET_BRANCH}
 
 # oslo.versionedobjects
 GITREPO["oslo.versionedobjects"]=${OSLOVERSIONEDOBJECTS_REPO:-${GIT_BASE}/openstack/oslo.versionedobjects.git}
-GITBRANCH["oslo.versionedobjects"]=${OSLOVERSIONEDOBJECTS_BRANCH:-master}
+GITBRANCH["oslo.versionedobjects"]=${OSLOVERSIONEDOBJECTS_BRANCH:-$TARGET_BRANCH}
 
 # oslo.vmware
 GITREPO["oslo.vmware"]=${OSLOVMWARE_REPO:-${GIT_BASE}/openstack/oslo.vmware.git}
-GITBRANCH["oslo.vmware"]=${OSLOVMWARE_BRANCH:-master}
+GITBRANCH["oslo.vmware"]=${OSLOVMWARE_BRANCH:-$TARGET_BRANCH}
 
 # osprofiler
 GITREPO["osprofiler"]=${OSPROFILER_REPO:-${GIT_BASE}/openstack/osprofiler.git}
-GITBRANCH["osprofiler"]=${OSPROFILER_BRANCH:-master}
+GITBRANCH["osprofiler"]=${OSPROFILER_BRANCH:-$TARGET_BRANCH}
 
 # pycadf auditing library
 GITREPO["pycadf"]=${PYCADF_REPO:-${GIT_BASE}/openstack/pycadf.git}
-GITBRANCH["pycadf"]=${PYCADF_BRANCH:-master}
+GITBRANCH["pycadf"]=${PYCADF_BRANCH:-$TARGET_BRANCH}
 
 # stevedore plugin manager
 GITREPO["stevedore"]=${STEVEDORE_REPO:-${GIT_BASE}/openstack/stevedore.git}
-GITBRANCH["stevedore"]=${STEVEDORE_BRANCH:-master}
+GITBRANCH["stevedore"]=${STEVEDORE_BRANCH:-$TARGET_BRANCH}
 
 # taskflow plugin manager
 GITREPO["taskflow"]=${TASKFLOW_REPO:-${GIT_BASE}/openstack/taskflow.git}
-GITBRANCH["taskflow"]=${TASKFLOW_BRANCH:-master}
+GITBRANCH["taskflow"]=${TASKFLOW_BRANCH:-$TARGET_BRANCH}
 
 # tooz plugin manager
 GITREPO["tooz"]=${TOOZ_REPO:-${GIT_BASE}/openstack/tooz.git}
-GITBRANCH["tooz"]=${TOOZ_BRANCH:-master}
+GITBRANCH["tooz"]=${TOOZ_BRANCH:-$TARGET_BRANCH}
 
 # pbr drives the setuptools configs
 GITREPO["pbr"]=${PBR_REPO:-${GIT_BASE}/openstack-dev/pbr.git}
-GITBRANCH["pbr"]=${PBR_BRANCH:-master}
+GITBRANCH["pbr"]=${PBR_BRANCH:-$TARGET_BRANCH}
 
 
 ##################
@@ -494,65 +506,65 @@
 
 # cursive library
 GITREPO["cursive"]=${CURSIVE_REPO:-${GIT_BASE}/openstack/cursive.git}
-GITBRANCH["cursive"]=${CURSIVE_BRANCH:-master}
+GITBRANCH["cursive"]=${CURSIVE_BRANCH:-$TARGET_BRANCH}
 
 # glance store library
 GITREPO["glance_store"]=${GLANCE_STORE_REPO:-${GIT_BASE}/openstack/glance_store.git}
-GITBRANCH["glance_store"]=${GLANCE_STORE_BRANCH:-master}
+GITBRANCH["glance_store"]=${GLANCE_STORE_BRANCH:-$TARGET_BRANCH}
 
 # keystone middleware
 GITREPO["keystonemiddleware"]=${KEYSTONEMIDDLEWARE_REPO:-${GIT_BASE}/openstack/keystonemiddleware.git}
-GITBRANCH["keystonemiddleware"]=${KEYSTONEMIDDLEWARE_BRANCH:-master}
+GITBRANCH["keystonemiddleware"]=${KEYSTONEMIDDLEWARE_BRANCH:-$TARGET_BRANCH}
 
 # s3 support for swift
 SWIFT3_REPO=${SWIFT3_REPO:-${GIT_BASE}/openstack/swift3.git}
-SWIFT3_BRANCH=${SWIFT3_BRANCH:-master}
+SWIFT3_BRANCH=${SWIFT3_BRANCH:-$TARGET_BRANCH}
 
 # ceilometer middleware
 GITREPO["ceilometermiddleware"]=${CEILOMETERMIDDLEWARE_REPO:-${GIT_BASE}/openstack/ceilometermiddleware.git}
-GITBRANCH["ceilometermiddleware"]=${CEILOMETERMIDDLEWARE_BRANCH:-master}
+GITBRANCH["ceilometermiddleware"]=${CEILOMETERMIDDLEWARE_BRANCH:-$TARGET_BRANCH}
 GITDIR["ceilometermiddleware"]=$DEST/ceilometermiddleware
 
 # os-brick library to manage local volume attaches
 GITREPO["os-brick"]=${OS_BRICK_REPO:-${GIT_BASE}/openstack/os-brick.git}
-GITBRANCH["os-brick"]=${OS_BRICK_BRANCH:-master}
+GITBRANCH["os-brick"]=${OS_BRICK_BRANCH:-$TARGET_BRANCH}
 
 # os-client-config to manage clouds.yaml and friends
 GITREPO["os-client-config"]=${OS_CLIENT_CONFIG_REPO:-${GIT_BASE}/openstack/os-client-config.git}
-GITBRANCH["os-client-config"]=${OS_CLIENT_CONFIG_BRANCH:-master}
+GITBRANCH["os-client-config"]=${OS_CLIENT_CONFIG_BRANCH:-$TARGET_BRANCH}
 GITDIR["os-client-config"]=$DEST/os-client-config
 
 # os-vif library to communicate between Neutron to Nova
 GITREPO["os-vif"]=${OS_VIF_REPO:-${GIT_BASE}/openstack/os-vif.git}
-GITBRANCH["os-vif"]=${OS_VIF_BRANCH:-master}
+GITBRANCH["os-vif"]=${OS_VIF_BRANCH:-$TARGET_BRANCH}
 
 # osc-lib OpenStackClient common lib
 GITREPO["osc-lib"]=${OSC_LIB_REPO:-${GIT_BASE}/openstack/osc-lib.git}
-GITBRANCH["osc-lib"]=${OSC_LIB_BRANCH:-master}
+GITBRANCH["osc-lib"]=${OSC_LIB_BRANCH:-$TARGET_BRANCH}
 
 # python-openstacksdk OpenStack Python SDK
 GITREPO["python-openstacksdk"]=${OPENSTACKSDK_REPO:-${GIT_BASE}/openstack/python-openstacksdk.git}
-GITBRANCH["python-openstacksdk"]=${OPENSTACKSDK_BRANCH:-master}
+GITBRANCH["python-openstacksdk"]=${OPENSTACKSDK_BRANCH:-$TARGET_BRANCH}
 
 # ironic common lib
 GITREPO["ironic-lib"]=${IRONIC_LIB_REPO:-${GIT_BASE}/openstack/ironic-lib.git}
-GITBRANCH["ironic-lib"]=${IRONIC_LIB_BRANCH:-master}
+GITBRANCH["ironic-lib"]=${IRONIC_LIB_BRANCH:-$TARGET_BRANCH}
 # this doesn't exist in a lib file, so set it here
 GITDIR["ironic-lib"]=$DEST/ironic-lib
 
 # diskimage-builder tool
 GITREPO["diskimage-builder"]=${DIB_REPO:-${GIT_BASE}/openstack/diskimage-builder.git}
-GITBRANCH["diskimage-builder"]=${DIB_BRANCH:-master}
+GITBRANCH["diskimage-builder"]=${DIB_BRANCH:-$TARGET_BRANCH}
 GITDIR["diskimage-builder"]=$DEST/diskimage-builder
 
 # neutron-lib library containing neutron stable non-REST interfaces
 GITREPO["neutron-lib"]=${NEUTRON_LIB_REPO:-${GIT_BASE}/openstack/neutron-lib.git}
-GITBRANCH["neutron-lib"]=${NEUTRON_LIB_BRANCH:-master}
+GITBRANCH["neutron-lib"]=${NEUTRON_LIB_BRANCH:-$TARGET_BRANCH}
 GITDIR["neutron-lib"]=$DEST/neutron-lib
 
 # os-traits library for resource provider traits in the placement service
 GITREPO["os-traits"]=${OS_TRAITS_REPO:-${GIT_BASE}/openstack/os-traits.git}
-GITBRANCH["os-traits"]=${OS_TRAITS_BRANCH:-master}
+GITBRANCH["os-traits"]=${OS_TRAITS_BRANCH:-$TARGET_BRANCH}
 
 ##################
 #
@@ -562,19 +574,19 @@
 
 # run-parts script required by os-refresh-config
 DIB_UTILS_REPO=${DIB_UTILS_REPO:-${GIT_BASE}/openstack/dib-utils.git}
-DIB_UTILS_BRANCH=${DIB_UTILS_BRANCH:-master}
+DIB_UTILS_BRANCH=${DIB_UTILS_BRANCH:-$BRANCHLESS_TARGET_BRANCH}
 
 # os-apply-config configuration template tool
 OAC_REPO=${OAC_REPO:-${GIT_BASE}/openstack/os-apply-config.git}
-OAC_BRANCH=${OAC_BRANCH:-master}
+OAC_BRANCH=${OAC_BRANCH:-$TRAILING_TARGET_BRANCH}
 
 # os-collect-config configuration agent
 OCC_REPO=${OCC_REPO:-${GIT_BASE}/openstack/os-collect-config.git}
-OCC_BRANCH=${OCC_BRANCH:-master}
+OCC_BRANCH=${OCC_BRANCH:-$TRAILING_TARGET_BRANCH}
 
 # os-refresh-config configuration run-parts tool
 ORC_REPO=${ORC_REPO:-${GIT_BASE}/openstack/os-refresh-config.git}
-ORC_BRANCH=${ORC_BRANCH:-master}
+ORC_BRANCH=${ORC_BRANCH:-$TRAILING_TARGET_BRANCH}
 
 
 #################
@@ -587,7 +599,7 @@
 
 # ironic python agent
 IRONIC_PYTHON_AGENT_REPO=${IRONIC_PYTHON_AGENT_REPO:-${GIT_BASE}/openstack/ironic-python-agent.git}
-IRONIC_PYTHON_AGENT_BRANCH=${IRONIC_PYTHON_AGENT_BRANCH:-master}
+IRONIC_PYTHON_AGENT_BRANCH=${IRONIC_PYTHON_AGENT_BRANCH:-$TARGET_BRANCH}
 
 # a websockets/html5 or flash powered VNC console for vm instances
 NOVNC_REPO=${NOVNC_REPO:-https://github.com/novnc/noVNC.git}
@@ -595,7 +607,7 @@
 
 # a websockets/html5 or flash powered SPICE console for vm instances
 SPICE_REPO=${SPICE_REPO:-http://anongit.freedesktop.org/git/spice/spice-html5.git}
-SPICE_BRANCH=${SPICE_BRANCH:-master}
+SPICE_BRANCH=${SPICE_BRANCH:-$BRANCHLESS_TARGET_BRANCH}
 
 # Global flag used to configure Tempest and potentially other services if
 # volume multiattach is supported. In Queens, only the libvirt compute driver