Script to easily build a package

Introduce build-fast shell script at the root of the repository to
easily build a package having version extracted from the SCM repository.

Reuses a copy of:
http://git.openstack.org/cgit/openstack-infra/project-config/tree/jenkins/scripts/version-properties.sh

Would save time for non maven guru like me.

Change-Id: Iab081de54553d6240604214c608554c6a147ae70

.gitignore

@@ -1,3 +1,4 @@
 /target
+/version.properties
 /work
 /.config

build-fast

@@ -0,0 +1,3 @@
+#!/bin/bash -eux
+. version-properties.sh
+mvn -Dproject-version="$PROJECT_VER" -DskipTests=true  clean package

version-properties.sh

@@ -0,0 +1,32 @@
+#!/bin/bash -ex
+#
+# This is a script that helps us version build artifacts.  It retrieves
+# git info and generates version strings.
+#
+# Source:
+# http://git.openstack.org/cgit/openstack-infra/project-config/tree/jenkins/scripts/version-properties.sh
+#
+
+# get version info from scm
+SCM_TAG=$(git describe --abbrev=0 --tags) || true
+SCM_SHA=$(git rev-parse --short HEAD) || true
+
+# assumes format is like this  '0.0.4-2-g135721c'
+COMMITS_SINCE_TAG=$(git describe | awk '{split($0,a,"-"); print a[2]}') || true
+
+# just use git sha if there is no tag yet.
+if [[ "${SCM_TAG}" == "" ]]; then
+    SCM_TAG=$SCM_SHA
+fi
+
+# General build version should be something like '0.0.4.3.d4ee90c'
+# Release build version should be something like '0.0.5'
+if [[ "${COMMITS_SINCE_TAG}" == "" ]]; then
+    PROJECT_VER=$SCM_TAG
+else
+    PROJECT_VER="$SCM_TAG.$COMMITS_SINCE_TAG.$SCM_SHA";
+fi
+
+echo "SCM_SHA=$SCM_SHA" >version.properties
+echo "PROJECT_VER=$PROJECT_VER" >>version.properties
+echo "COMMITS_SINCE_TAG=$COMMITS_SINCE_TAG" >>version.properties