From 4cf22e75c409b1d44e89134ba562bb6493d2031e Mon Sep 17 00:00:00 2001
From: Siegfried Siegert <Siegfried.Siegert@mimbach49.de>
Date: Fri, 4 Sep 2020 12:44:54 +0200
Subject: [PATCH] Update build script to use command line options

---
 build.sh | 77 ++++++++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 58 insertions(+), 19 deletions(-)

diff --git a/build.sh b/build.sh
index a5a0ac9..1f7a6af 100755
--- a/build.sh
+++ b/build.sh
@@ -2,15 +2,10 @@
 
 TARGET=mqttListener
 
+# expand PATH for go tools
 export PATH=$PATH:~/go/bin
 
 
-
-
-
-
-
-
 RED='\e[0;31m'
 GREEN='\e[0;32m'
 LIGHT_YELLOW='\e[93m'
@@ -18,6 +13,11 @@ NC='\e[0m' # No Color
 BOLD='\e[1m'
 NORMAL='\e[21m'
 
+#######################################################################################
+# defaults
+GO_BUILD_OPTIONS=-v
+#GO_BUILD_OPTIONS="-a -v"
+DEFAULT_TARGET=amd64
 
 
 #######################################################################################
@@ -25,31 +25,70 @@ NORMAL='\e[21m'
 
 die() { echo -e "\n${RED}$@${NC}" 1>&2 ; exit 1; }
 
+usage() {
+  echo "usage: `basename $0` [<TARGET>] [all]"
+}
 
 
 #######################################################################################
+# build functions
 
-#cd /src
+build_linux_amd64() {
+    echo -e "\nBuilding for Linux amd64:"
+    env GOOS=linux GOARCH=amd64 go build ${GO_BUILD_OPTIONS} -ldflags "$(govvv -flags)" -o ${TARGET}-linux-amd64
+    echo -e "\t\t${GREEN}... done${NC}"
+}
 
-if ! command -v govvv &> /dev/null ; then
-	die "govv is not installed"	
+build_linux_arm() {
+    echo -e "\nBuilding for arm:"
+    env GOOS=linux GOARCH=arm go build ${GO_BUILD_OPTIONS} -ldflags "$(govvv -flags)" -o ${TARGET}-linux-arm
+    echo -e "\t\t${GREEN}... done${NC}"
+
+    echo -e "\nstipping arm binary:"
+    strip -o ${TARGET}-linux-arm-stripped ${TARGET}-linux-arm
+    echo -e "\t\t${GREEN}... done${NC}"
+}
+
+#######################################################################################
+# checks
+
+echo -e "${NC}\n "
+
+
+if [ ! command -v govvv &> /dev/null ] ; then
+    die "govvv is not installed"	
 fi	
 
 
+if [ $# -eq 0 ] ; then
+    echo -e "\nbuilding for default TARGET ${DEFAULT_TARGET}..."
+    TARGET=${DEFAULT_TARGET}
+else
+    TARGET=$1
+fi
 
 #######################################################################################
 # build
-echo -e "${NC}\n "
 
-echo -e "\nBuilding for Linux 64-bit:"
-env GOOS=linux GOARCH=amd64 go build -a -v -ldflags "$(govvv -flags)" -o ${TARGET}-linux-amd64
-echo -e "\t\t${GREEN}... done${NC}"
+#cd /src
 
 
-echo -e "\nBuilding for arm:"
-env GOOS=linux GOARCH=arm go build -a -v -ldflags "$(govvv -flags)" -o ${TARGET}-linux-arm
-echo -e "\t\t${GREEN}... done${NC}"
+if [ "$2" == "all" ] ; then
+    echo -e "\nforce rebuilding of all packages..."
+    GO_BUILD_OPTIONS="-a -v"
+fi
+
+
+case "${TARGET}" in
+"arm"|"ARM")
+    build_linux_arm
+    ;;
+"amd64"|"AMD64")
+    build_linux_amd64
+    ;;
+*)
+    usage
+    die "Target ${TARGET} is not defined"
+    ;;
+esac
 
-echo -e "\nstipping arm binary:"
-strip -o ${TARGET}-linux-arm-stripped ${TARGET}-linux-arm
-echo -e "\t\t${GREEN}... done${NC}"