TT#102912 Provide invocation name of ngcpcfg to subprocesses

Instead of having to identify the parent process name (ngcpcfg vs.
ngcp-config) inside subprocesses (like "status"), let's provide the
invocation name through the main ngcpcfg binary via variable
NGCPCFG_NAME.

Thanks to Guillem Jover for the suggestion.

Change-Id: Iafbac535bedb9cc9dc73f3d95861a5bc735cc739

sbin/ngcpcfg

@@ -111,6 +111,10 @@ fi
 # Notify subprocesses we are running.
 export NGCPCFG_RUNNING=1
 
+# Provide invocation name (ngcpcfg vs. ngcp-config) to subprocesses/scripts
+NGCPCFG_NAME="$(basename "$0")"
+export NGCPCFG_NAME
+
 export NGCPCFG_PID=$$
 logger -t ngcpcfg --id="${NGCPCFG_PID}" -- "******************************************************"
 logger -t ngcpcfg --id="${NGCPCFG_PID}" -- "Running: $0 $*"

scripts/status

@@ -52,13 +52,7 @@ check_local_state() {
   log_debug "cd $NGCPCTL_MAIN"
   cd "$NGCPCTL_MAIN"
 
-  # report either "ngcpcfg" or "ngcp-config", depending on how it was invoked
-  local invoker
-  if [ -r "/proc/${PPID:-doesnotexist}/comm" ] ; then
-    invoker="$( < /proc/$PPID/comm)"
-  fi
-
-  log_info "Checking state of ${invoker:-ngcpcfg}:"
+  log_info "Checking state of ${NGCPCFG_NAME:-ngcpcfg}:"
 
   if ! [ -r "${NGCPCTL_MAIN}/.git/HEAD" ] ; then
     log_warn "ngcpcfg has not been initialised yet. Execute 'ngcpcfg initialise'."