A bash script I use to checkout a specific version of the Pipeline 2 modules (master, v1.8, v1.9); makes it easy to switch between them during development.

checkout.sh

#!/bin/bash

# WARNING: this will git pull all projects, which may overwrite any unstaged file changes! I've added "git add -A" to the script to avoid this, but try commiting any changes before running this script just to be safe.

# Convenience script that checks out Pipeline 2 module projects for a given minor version (or master)
#
# To checkout:
# ./pipeline-build.sh tag
#

TAG="$1"
if [ "`echo "$TAG" | grep -i master | wc -l`" = 1 ]; then
    TAG="master"
else
    if [ "`echo "$TAG" | grep "[^0-9]*[0-9]*\.[0-9]*[^0-9]*" | wc -l`" -eq 1 ]; then
        TAG="`echo "$TAG" | sed 's/[^0-9]*\([0-9]*\.[0-9]*\)[^0-9]*/\1/'`"
    else
        echo "Invalid tag: '$1'"
        exit
    fi
fi
echo "checking out $TAG..."

function assertSuccess(){
	if [ $? -ne 0 ]; then echo "failed to checkout $TAG" && exit 1; fi
}

function checkout(){
	echo "cd $1"
	cd "$1"; assertSuccess
    echo "git add -A"
    git add -A; assertSuccess
	if [ `git status | grep detached | wc -l` -eq 0 ]; then
		echo "git pull"
		git pull #; assertSuccess
	else
		echo "working in detached state; won't pull"
	fi
    MATCHING_TAG=""
    if [ "$2" = "master" ]; then
        MATCHING_TAG="master"
    else
        for tag in $(git tag | sort | tac) ; do
            if [ "`echo $tag | grep $2 | wc -l`" -eq 1 ]; then
                MATCHING_TAG="$tag"
                break
            fi
        done
    fi
    if [ "$MATCHING_TAG" != "" ]; then
    	echo "git checkout $MATCHING_TAG"
    	git checkout $MATCHING_TAG; assertSuccess
    fi
}

# Modules
for path in ~/pipeline-modules/*; do
    [ -d "${path}" ] || continue # if not a directory, skip
    dirname="$(basename "${path}")"
    checkout ~/pipeline-modules/$dirname "$TAG"
    echo $dirname
done

# Dependencies
if [ "$TAG" = "master" ]; then
    checkout ~/pipeline-maven-parents/daisy-parent "master"
    checkout ~/xproc-maven-plugin "master"
    checkout ~/pipeline-build-utils "master"
fi
if [ "$TAG" = "1.8" ]; then
    checkout ~/pipeline-maven-parents/daisy-parent "daisy-parent-2"
    checkout ~/xproc-maven-plugin "xproc-engine-daisy-pipeline-1.8.1"
    checkout ~/pipeline-build-utils "pax-exam-helper-1.8.1"
fi
if [ "$TAG" = "1.9" ]; then
    checkout ~/pipeline-maven-parents/daisy-parent "daisy-parent-3"
    checkout ~/xproc-maven-plugin "xproc-engine-daisy-pipeline-1.9"
    checkout ~/pipeline-build-utils "pax-exam-helper-1.9"
fi