added param --trace as 1st param

cm.sh

@@ -23,6 +23,7 @@
 # 2021-06-24  <axel.hahn@iml.unibe.ch>  added transfer command; delete files if acme.sh --install-cert ... failes
 # 2021-07-14  <axel.hahn@iml.unibe.ch>  added _wait_for_free_slot in cert actions to execute multiple processes sequentially
 # 2021-09-27  <axel.hahn@iml.unibe.ch>  softer behaviour: do not revoke changed certs (add does not stop; ensure does not delete)
+# 2021-12-23  <axel.hahn@iml.unibe.ch>  added param --trace as 1st param to generate a trace log 
 # ======================================================================
 
 
@@ -32,8 +33,9 @@
 #
 # ----------------------------------------------------------------------
 
-touchfile="./log/lastchange.txt"
-logfile="./log/certmanager.log"
+logdir="./log"
+touchfile="$logdir/lastchange.txt"
+logfile="$logdir/certmanager.log"
 
 csrfile="./templates/csr.txt"
 
@@ -569,6 +571,19 @@ function public_transfer(){
 
 cd $( dirname $0 )
 
+if [ "$1" = "--trace" ]; then
+	tracelog="$logdir/trace__$2__$3__`date +%Y-%m-%d__%H-%M-%S`.log"
+	exec  > >(tee -a ${tracelog}    )
+	exec 2> >(tee -a ${tracelog} >&2)
+	echo "TRACELOG was triggered."
+	echo "TIME   : $(date)"
+	echo "COMMAND: $0 $*"
+	echo "LOG    : $tracelog"
+
+	# set -vx
+	shift 1
+fi
+
 cat <<ENDOFHEADER
 $line
 
@@ -621,7 +636,7 @@ else
 HELP
 
 The basic syntax is
-$self ACTION [FQDN] [ALIAS_1 [.. ALIAS_N]]
+$self [--trace] ACTION [FQDN] [ALIAS_1 [.. ALIAS_N]]
 
 The ACTIONs for SINGLE certificate handlings are:
 
@@ -675,6 +690,11 @@ other ACTIONs
                 check of health with current setup and requirements.
                 This command is helpful for initial setups.
 
+OPTIONS
+        --trace (it must be the 1st parameter) 
+                the output additionally will be written into a tracelog file 
+                below $logdir.
+
 EOF
 fi