solution: paths relative to config, default is at /etc/dshackle

src/test/groovy/io/emeraldpay/dshackle/FileResolverSpec.groovy

@@ -0,0 +1,42 @@
+/**
+ * Copyright (c) 2019 ETCDEV GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.emeraldpay.dshackle
+
+import spock.lang.Specification
+
+class FileResolverSpec extends Specification {
+
+    def "Leaves absolute path"() {
+        setup:
+        def resolver = new FileResolver(new File("/tmp"))
+        expect:
+        resolver.resolve(path).absolutePath == path
+        where:
+        path << ["/test.txt", "/etc/dshackle/dshackle.yaml"]
+    }
+
+    def "Start from base dir for related path"() {
+        setup:
+        def resolver = new FileResolver(new File("/tmp"))
+        expect:
+        resolver.resolve(path).canonicalPath == new File(fullPath).canonicalPath
+        where:
+        path            |   fullPath
+        "test.txt"      |   "/tmp/test.txt"
+        "./test.txt"    |   "/tmp/test.txt"
+        "./tls/ca.crt"  |   "/tmp/tls/ca.crt"
+    }
+}