Add script to orchestrate multiple composes

It may make sense to break a big compose into smaller chunks that can be
done independently. This script allows describing the smaller parts,
runs them with correct dependencies and arranges the result to look like
a single big compose.

All parts use the same koji event, that is either obtained from Koji, or
from command line argument.

JIRA: COMPOSE-2654
Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>

tests/data/client.conf

@@ -0,0 +1,14 @@
+from dummy-pungi import *
+
+tree_variants = ["Client"]
+pkgset_repos = {
+    "i386": [
+        "{{configdir}}/repo",
+    ],
+    "x86_64": [
+        "{{configdir}}/repo",
+    ],
+    "s390x": [
+        "{{configdir}}/repo",
+    ],
+}

tests/data/multi-compose-variants.xml

@@ -0,0 +1,47 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE variants PUBLIC "-//Red Hat, Inc.//DTD Variants info//EN" "variants.dtd">
+
+<variants>
+  <variant id="ResilientStorage" name="Resilient Storage" type="variant">
+    <arches>
+      <arch>x86_64</arch>
+    </arches>
+    <groups>
+      <group default="true">resilient-storage</group>
+    </groups>
+  </variant>
+
+  <variant id="Client" name="Client" type="variant">
+    <arches>
+      <arch>i386</arch>
+      <arch>x86_64</arch>
+    </arches>
+    <groups>
+      <group default="true">core</group>
+      <group default="true">standard</group>
+      <group default="false">text-internet</group>
+      <group default="true" uservisible="false">firefox</group>
+      <group>skype</group>
+    </groups>
+    <environments>
+      <environment>minimal</environment>
+      <environment display_order="1000">desktop</environment>
+    </environments>
+  </variant>
+
+  <variant id="Server" name="Server" type="variant">
+    <arches>
+      <arch>x86_64</arch>
+      <arch>s390x</arch>
+    </arches>
+    <groups>
+      <group default="true" uservisible="true">core</group>
+      <group default="true">standard</group>
+      <group default="true">text-internet</group>
+    </groups>
+    <environments>
+      <environment>minimal</environment>
+    </environments>
+  </variant>
+
+</variants>

tests/data/multi-compose.conf

@@ -0,0 +1,19 @@
+[general]
+release_name = Multi Compose
+release_short = multi
+release_version = 1.0
+release_type = ga
+compose_type = nightly
+target = ../_composes/
+extra_args = --quiet
+
+[server]
+config = server.conf
+
+[client]
+config = client.conf
+
+[resilient-storage]
+config = resilient-storage.conf
+depends_on = server
+failable = yes

tests/data/resilient-storage.conf

@@ -0,0 +1,15 @@
+from dummy-pungi import *
+
+tree_variants = ["ResilientStorage"]
+variants_file = "multi-compose-variants.xml"
+pkgset_repos = {
+    "i386": [
+        "{{configdir}}/repo",
+    ],
+    "x86_64": [
+        "{{configdir}}/repo",
+    ],
+    "s390x": [
+        "{{configdir}}/repo",
+    ],
+}

tests/data/server.conf

@@ -0,0 +1,16 @@
+from dummy-pungi import *
+
+tree_variants = ["Server"]
+variants_file = "multi-compose-variants.xml"
+pkgset_repos = {
+    "i386": [
+        "{{configdir}}/repo",
+    ],
+    "x86_64": [
+        "{{configdir}}/repo",
+    ],
+    "s390x": [
+        "{{configdir}}/repo",
+    ],
+}
+extra_isos = {}