fix: bail out if arc dir already exists to avoid arc2webarc.pl getting interactive

import_mbox.sh

@@ -37,11 +37,16 @@ if [ ! -f "$MBOX_FILE" ]; then
     echo "$SYNTAX" >&2
     exit 1
 fi
-if [ ! -d "$SYMPA_ROOT/list_data/$SYMPA_DOMAIN/$LIST_NAME" ]; then
+if [ ! -d $SYMPA_ROOT/list_data/$SYMPA_DOMAIN/$LIST_NAME ]; then
     echo "Missing or invalid list name!" >&2
     echo "$SYNTAX" >&2
     exit 1
 fi
+arcdir=$SYMPA_ROOT/arc/$LIST_NAME@$SYMPA_DOMAIN
+if [ -e $arcdir ]; then
+    echo "ERROR: arc dir '$arcdir' already exists, please clean up first" >&2
+    exit 1
+fi
 
 # Create archives directory if not yet done
 mkdir -p "$SYMPA_ROOT/list_data/$SYMPA_DOMAIN/$LIST_NAME/archives"
@@ -61,7 +66,7 @@ pushd "$SYMPA_ROOT/list_data/$SYMPA_DOMAIN/$LIST_NAME/archives"
 # Convert to Sympa text archives
 echo "Step 2: converting $MBOX_BACKUP into .log files" >&2
 $base/mbox2sympa.pl $MBOX_BACKUP
-rm $MBOX_BACKUP
+rm -f $MBOX_BACKUP
 
 chown -R $SYMPA_USER "$SYMPA_ROOT/list_data/$SYMPA_DOMAIN/$LIST_NAME/archives"
 chmod -R g=rX,o= "$SYMPA_ROOT/list_data/$SYMPA_DOMAIN/$LIST_NAME/archives"