Support for alternate trunk name (not master)

Commit 537a292674 introduced support
for having trunk named something other than master.

The name "master" is still hardcoded in the test-matrix, and in
the list of allowed branches. Adding support for an arbitrary
features file via DEVSTACK_GATE_FEATURE_MATRIX env variable.

The list of allowed branches is now parsed from the feature matrix.

Change-Id: Ic07c958e1630f7e62d9ff35b0add40a5d2b1548b

devstack-vm-gate-wrap.sh

@@ -121,6 +121,9 @@ fi
 rm -rf $WORKSPACE/logs
 mkdir -p $WORKSPACE/logs
 
+# The feature matrix to select devstack-gate components
+export DEVSTACK_GATE_FEATURE_MATRIX=${DEVSTACK_GATE_FEATURE_MATRIX:-features.yaml}
+
 # Set to 1 to run the Tempest test suite
 export DEVSTACK_GATE_TEMPEST=${DEVSTACK_GATE_TEMPEST:-0}
 

devstack-vm-gate.sh

@@ -33,7 +33,7 @@ function setup_localrc() {
         rm -f localrc
     fi
 
-    MY_ENABLED_SERVICES=`cd $BASE/new/devstack-gate && ./test-matrix.py -b $LOCALRC_BRANCH`
+    MY_ENABLED_SERVICES=`cd $BASE/new/devstack-gate && ./test-matrix.py -b $LOCALRC_BRANCH -f $DEVSTACK_GATE_FEATURE_MATRIX`
 
     # Allow optional injection of ENABLED_SERVICES from the calling context
     if [ ! -z $ENABLED_SERVICES ] ; then

features.yaml

@@ -33,6 +33,12 @@ config:
   zeromq:
     features: [zeromq]
 
+branches:
+  # The value of ""default" is the name of the "trunk" branch
+  default: master
+  # Normalized branch names only here, e.g. stable/icehouse => icehouse
+  allowed: [master, icehouse, havana]
+
 features:
   default:
     base:

test-matrix.py

@@ -21,7 +21,7 @@ import sys
 import yaml
 
 GRID = None
-ALLOWED_BRANCHES = ('havana', 'icehouse', 'master')
+ALLOWED_BRANCHES = []
 
 FORMAT = '%(asctime)s %(levelname)s: %(message)s'
 logging.basicConfig(format=FORMAT)
@@ -37,7 +37,7 @@ def normalize_branch(branch):
     if branch.startswith("feature/"):
         # Feature branches chase master and should be tested
         # as if they were the master branch.
-        branch = 'master'
+        branch = GRID['branches']['default']
     elif branch.startswith("stable/"):
         branch = branch[len("stable/"):]
     if branch not in ALLOWED_BRANCHES:
@@ -112,8 +112,10 @@ of environmental feature definitions and flags.
 
 def main():
     global GRID
+    global ALLOWED_BRANCHES
     opts = get_opts()
     GRID = parse_features(opts.features)
+    ALLOWED_BRANCHES = GRID['branches']['allowed']
     branch = normalize_branch(opts.branch)
 
     features = calc_features(branch, configs_from_env())