Retrieve a Maven artifact from Nexus without using Maven

nexartrel.sh

#!/bin/bash

# Name: Nexus MVN Retrieval
# Script: nexartrel.sh
# Version: 0.0.3
# Author: Adam Whitlock [[email protected]]

# Command line options to be passed
function options {

	while getopts "u:p:b:n:r:g:l:v:" opt; do
	  case ${opt} in
        u ) USERNAME="${OPTARG}";;
        p ) PASSWORD="${OPTARG}";;
        b ) BASEURL="${OPTARG}";;
        n ) NAME="${OPTARG}";;
        r ) REPOSITORY="${OPTARG}";;
        g ) GROUPNAME="${OPTARG}";;
        l ) LATEST="${OPTARG}";;	
        v ) VERSION="${OPTARG}";;
	    \? ) usage
	      ;;
	  esac
	done

}

# Usage of Nexus script
function usage {
	cat <<EOM
    Purpose: Retrieve Maven artifacts from Nexus 3
    Usage: $(basename $0)
     -u      Username for Nexus
     -p      Password for Nexus
     -b      Base URL for Nexus (ex: "https://build.company.com/nexus/repository/")
     -n      Name of artifact (ex: "domain")
     -r      Repository URL (ex: "maven-snapshots")
     -g      Groupname (ex: "com.companyname.service")
     -l      Use the LATEST version of the artifact
     -v      Specify the VERSION of the artifact (not used with LATEST)
EOM
	exit 0
}


# Main method for nexartrel 
function main {

	# Provide usage and command line options
	if [[ $# -lt 1 ]]; then
		usage
		exit 0
	else 
		options $@
	fi


	# Setup credentials if provided
	if [[ ! -z $USERNAME || ! -z $PASSWORD ]]; then
		CREDENTIALS="-u ${USERNAME}:${PASSWORD}"
	fi

	# Create tempfile
	TEMPFILE=$(mktemp ./nexus_latest.XXXXXX)


	# Retrieve "LATEST" artifact version from Nexus
	if [[ $LATEST == "true" ]]; then
		curl ${CREDENTIALS} ${BASEURL}/${REPOSITORY}/${GROUPNAME//.//}/${NAME}/maven-metadata.xml > /dev/null 2>&1 -o ${TEMPFILE}
		LATEST=$(cat ${TEMPFILE} | grep "<latest>.*</latest>" | sed -e "s#\(.*\)\(<latest>\)\(.*\)\(</latest>\)\(.*\)#\3#g")
		curl ${CREDENTIALS} ${BASEURL}/${REPOSITORY}/${GROUPNAME//.//}/${NAME}/${LATEST}/maven-metadata.xml > /dev/null 2>&1 -o ${TEMPFILE}

		VERSION_FULL=$(cat ${TEMPFILE} | sort | grep "<value>" | tail -1 | sed -e "s#\(.*\)\(<value>\)\(.*\)\(</value>\)\(.*\)#\3#g") 		
		ARTIFACT_URL="${BASEURL}/${REPOSITORY}/${GROUPNAME//.//}/${NAME}/${LATEST}/${NAME}-${VERSION_FULL// /}.jar" 

		echo $ARTIFACT_URL

	else 
		curl ${CREDENTIALS} ${BASEURL}/${REPOSITORY}/${GROUPNAME//.//}/${NAME}/maven-metadata.xml > /dev/null 2>&1 -o ${TEMPFILE}
		VERSION=$(grep "${VERSION}" ${TEMPFILE} | head -1 |  sed -e "s#\(.*\)\(<version>\)\(.*\)\(</version>\)\(.*\)#\3#g")
		
		# Strip out latest if it's actually the latest version
		VERSION=$(echo $VERSION | sed -e "s#\(.*\)\(<latest>\)\(.*\)\(</latest>\)\(.*\)#\3#g")
		curl ${CREDENTIALS} ${BASEURL}/${REPOSITORY}/${GROUPNAME//.//}/${NAME}/${VERSION}/maven-metadata.xml > /dev/null 2>&1 -o ${TEMPFILE}
		VERSION_FULL=$(cat ${TEMPFILE} | sort | grep "<value>" | tail -1 | sed -e "s#\(.*\)\(<value>\)\(.*\)\(</value>\)\(.*\)#\3#g") 		
		echo $VERSION_FULL
		ARTIFACT_URL="${BASEURL}/${REPOSITORY}/${GROUPNAME//.//}/${NAME}/${VERSION}/${NAME}-${VERSION_FULL// /}.jar" 

		echo $ARTIFACT_URL

	fi

	# Cleanup 
	rm -f ${TEMPFILE}

}

main "$@"