more flexible command line flag handling

support/bin/rtcds.in

@@ -4,6 +4,48 @@ log() {
     echo "$@" >&2
 }
 
+# capture all command line flags as variables
+params=""
+ccmd=""
+while (( "$#" )); do
+    case "$1" in
+        --all)
+            ALL_FLAG=0
+            shift
+            ;;
+        --user-space|--userland)
+            USERLAND_FLAG=0
+            shift
+            ;;
+        -f)
+            FOLLOW_FLAG=0
+            shift
+            ;;
+        -i)
+            INFO_FLAG=0
+            shift
+            ;;
+        version|-v|--version)
+            VERSION_FLAG=0
+            shift
+            ;;
+        help|-h|--help)
+            HELP_FLAG=0
+            shift
+            ;;
+        --*|-*)  # unknown flags
+            log "Error: Unknown flag $1"
+            exit 1
+            ;;
+        *)  #handle non-flags
+            params="${params} $1"
+            shift
+            ;;
+    esac
+done
+
+eval set -- "$params"
+
 RTS_VERSION=${RTS_VERSION:-__VERSION__}
 if [[ "$RTS_VERSION" =~ ._VERSION_. ]] ; then
     log "RTS_VERSION variable not set."
@@ -364,14 +406,15 @@ usage() {
     local enable_usage=""
   fi
 
-    echo "Usage: $(basename $0) <command> [args]
+    echo "Usage: $(basename $0) <command> [options] [args]
 
 Advanced LIGO Real Time System control interface.
 
 Available commands:
 
-  build|make <sys>           build system
-  install <sys>              install system
+  build|make <sys>...|--all  build system
+    --user-space|--userland  build for user space instead of kernel space
+  install <sys>...|--all     install system
 
   list|ls                    list systems for host
 
@@ -393,7 +436,17 @@ Available commands:
 "
 }
 
-if [ "$1" ] ; then
+if [[ $HELP_FLAG ]]; then
+    usage
+    exit 0
+fi
+
+if [[ $VERSION_FLAG ]] ; then
+    echo $RTS_VERSION
+    exit 0
+fi
+
+if [[ $1 ]] ; then
     cmd=$1
     shift
 else
@@ -403,101 +456,100 @@ else
     exit 1
 fi
 
+
 case $cmd in
     'build'|'make')
-	if [ -z "$1" ] ; then
+    if [[ $ALL_FLAG ]] ; then
+        check_env
+        prep_buildd
+        build_world
+    elif [[ $1 ]] ; then
+        check_env
+        prep_buildd
+        build_sys $@
+    else
 	    log "You must specify at least one system to build."
 	    exit 2
 	fi
-	check_env
-	prep_buildd
-        if [[ "$1" == '--all' ]] ; then
-            build_world
-        else
-	    build_sys $@
-        fi
 	;;
     'install')
-	if [ -z "$1" ] ; then
+    if [[ $ALL_FLAG ]] ; then
+        check_env
+        prep_target
+        install_world
+    elif [[ $1 ]] ; then
+        check_env
+        prep_target
+        install_sys $@
+    else
 	    log "You must specify at least one system to install."
 	    exit 2
 	fi
-	check_env
-	prep_target
-        if [[ "$1" == '--all' ]] ; then
-            install_world
-        else
-	    install_sys $@
-        fi
 	;;
     'start')
-	if [ -z "$1" ] ; then
+    if [[ $ALL_FLAG ]] ; then
+        start_sys $(list_host_sys)
+    elif [[ $1 ]] ; then
+        check_host_sys_inactive $@
+        start_sys $@
+	else
 	    log "You must specify at least one system to start (or '--all')."
 	    exit 2
 	fi
-	if [[ "$1" == '--all' ]] ; then
-	    start_sys $(list_host_sys)
-	else
-	    check_host_sys_inactive $@
-	    start_sys $@
-	fi
 	;;
     'restart')
-	if [ -z "$1" ] ; then
+    if [[ $ALL_FLAG ]] ; then
+        # we do this in reverse so the IOP is stopped last
+        stop_sys $(list_host_sys | tac)
+        start_sys $(list_host_sys)
+    elif [[ $1 ]] ; then
+        check_host_sys_active $@
+        stop_sys $@
+        start_sys $@
+	else
 	    log "You must specify at least one system to restart (or '--all')."
 	    exit 2
 	fi
-	if [[ "$1" == '--all' ]] ; then
-	    # we do this in reverse so the IOP is stopped last
-	    stop_sys $(list_host_sys | tac)
-	    start_sys $(list_host_sys)
-	else
-	    check_host_sys_active $@
-	    stop_sys $@
-	    start_sys $@
-	fi
 	;;
     'stop'|'kill')
-	if [ -z "$1" ] ; then
+    if [[ $ALL_FLAG ]] ; then
+        # we do this in reverse so the IOP is stopped last
+        stop_sys $(list_host_sys | tac)
+    elif [[ $1 ]] ; then
+        check_host_sys_active $@
+        stop_sys $@
+	else
 	    log "You must specify at least one system to stop (or '--all')."
 	    exit 2
 	fi
-	if [[ "$1" == '--all' ]] ; then
-	    # we do this in reverse so the IOP is stopped last
-	    stop_sys $(list_host_sys | tac)
-	else
-	    check_host_sys_active $@
-	    stop_sys $@
-	fi
 	;;
     'enable'|'disable')
-	if [[ ${cmd} == 'enable' ]] && ! $ALLOW_MODEL_ENABLE ]] ; then
-	    log "Enabling models is not allowed on this host."
-	    log "ALLOW_MODEL_ENABLE environment variable is set to false."
-	    exit 2
-	fi
-	if [ -z "$1" ] ; then
+    if [[ ${cmd} == 'enable' ]] && ! $ALLOW_MODEL_ENABLE ]] ; then
+        log "Enabling models is not allowed on this host."
+        log "ALLOW_MODEL_ENABLE environment variable is set to false."
+        exit 2
+    fi
+    if [[ $ALL_FLAG ]] ; then
+        # we do this in reverse so the IOP is stopped last
+        ${cmd}_sys $(list_host_sys | tac)
+    elif [[ $1 ]] ; then
+        ${cmd}_sys $@
+    else
 	    log "You must specify at least one system to $cmd (or '--all')."
 	    exit 2
 	fi
-	if [[ "$1" == '--all' ]] ; then
-	    # we do this in reverse so the IOP is stopped last
-	    ${cmd}_sys $(list_host_sys | tac)
-	else
-	    ${cmd}_sys $@
-	fi
 	;;
     'status')
-	if [ -z "$1" ] ; then
+	if [ -z "$1" ] || [[ $ALL_FLAG ]] ; then
 	    global_status
 	else
 	    sys=$1
 	    systemctl status rts@${sys}.target rts-{awgtpman,epics,module}@${sys}.service
 	fi
-        ;;
+    ;;
     'log')
         args=
-	if [[ "$1" == '-f' ]] ; then
+	if [[ $FOLLOW_FLAG ]] ; then
 	    args="-f"
 	    shift
 	fi
@@ -510,7 +562,7 @@ case $cmd in
         ;;
     'blog')
 	format=full
-	if [[ "$1" == '-i' ]] ; then
+	if [[ $INFO_FLAG ]] ; then
 	    format=info
 	    shift
 	fi
@@ -540,12 +592,6 @@ case $cmd in
     'env')
 	check_env
 	;;
-    'version'|'v'|'vers'|'-v'|'--version')
-	echo $RTS_VERSION
-	;;
-    'help'|'-h'|'--help')
-	usage
-	;;
     *)
 	log "Unknown command: $cmd"
 	log