feat: Add local_target variable and tests

src/lib/script.sh

@@ -37,7 +37,7 @@ validate_sources() {
 }
 
 validate_targets() {
-    # Check targets array.
+    # Check targets array and set local_target variable.
     #
     # Usage: validate_targets ARRAY
 
@@ -46,24 +46,28 @@ validate_targets() {
 
     local array=("$@")
     local scheme=
-    local file_scheme=0
+    local file_targets=()
 
     for uri in "${array[@]}"; do
         scheme="${uri%%:*}"
         case "$scheme" in
             file|ftp|sftp|rsync|s3|swift|sj|dav|davs)
                 if [[ "$scheme" == file ]]; then
-                    (( file_scheme++ )) || true
+                    file_targets+=("$uri")
                 fi
             ;;
             *) echo "Error: Unsupported URI scheme: $scheme" >&2; exit 1;;
         esac
     done
 
-    if [ "$file_scheme" -eq 0 ]; then
+    if [ "${#file_targets[@]}" -eq 0 ]; then
         echo "Error: 'file' scheme is not set in targets." \
             "You must provide one or more targets with 'file' scheme." >&2
         exit 1
+    else
+        # Set local_target. This variable contains path to save local backups.
+        # Files to additional targets will be coped from this directory.
+        local_target="${file_targets[0]}"
     fi
 }