New common function to create config files savely

sequencer/sequencer.sh

@@ -17,6 +17,7 @@ ERNO=0
 MAX_STEP=255
 ALIAS=
 TEMPLATE_NAME=seqTemplateExample.sh
+MISSING_CONF=missingConf.h
 VERSION_STRING="${VERSION_REV}.${VERSION_MAJOR}.${VERSION_MINOR}"
 
 helpSequencer() {
@@ -88,6 +89,41 @@ endReturn() {
   fi
 }
 
+# addConf <CONFIGTEXT> <CONFIGFILE>
+# trying to write a file
+# if exists, one attempt is made to create bck file of it
+# if all fails, a log file is created with the conflicts to be resolved by the user
+addConf() {
+  echo -n "Writing $2 ... "
+  # try writing config directly
+  if [ ! -f "$2" ] ; then
+    echo "$1" > "$2"
+    echo "ok"
+    return 0
+  fi
+
+  # try backup existing config
+  if [ ! -f "$2".bck ] ; then
+    cp -ar "$2" "$2".bck
+    echo "$1" > "$2"
+    echo "[WARN] Existing config saved to ${2}.bck"
+    return 0
+  fi
+
+  # add configuration to missingConf file
+  if [ "$missingDate" = "" ] ; then
+    missingDate=set
+    echo -n "###  " >> "$MISSING_CONF"
+    date >> "$MISSING_CONF"
+  fi
+  echo "#--- $2 ---" >> "$MISSING_CONF"
+  echo "$1" >> "$MISSING_CONF"
+  echo >> "$MISSING_CONF"
+
+  echo "[WARN] Check $(realpath "$missingConf") for configuration conflicts ($2)"
+  return 1
+}
+
 # execute [-q] <Step Number>
 #    -q: don't stop and don't report step functions which cannot be found 
 # execute given step_<Step Number> function