[WIP] Add softlinks at runtime for every classpath entry

tomcat/add-classpath-entries.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+mkdir -p "{{.libDir}}"
+while IFS=: read -d: -r path; do
+    printf "Linking $path to '{{.libDir}}/$(basename $path)'\n"
+    ln -s "$path" "{{.libDir}}/$(basename $path)"
+done <<< "${CLASSPATH}"

tomcat/base.go

@@ -103,6 +103,10 @@ func (b Base) Contribute(layer libcnb.Layer) (libcnb.Layer, error) {
 			return libcnb.Layer{}, fmt.Errorf("unable to contribute logging\n%w", err)
 		}
 
+		if err := b.ContributeClasspathEntries(layer); err != nil {
+			return libcnb.Layer{}, fmt.Errorf("unable to contribute classpath entries\n%w", err)
+		}
+
 		if b.ExternalConfigurationDependency != nil {
 			if err := b.ContributeExternalConfiguration(layer); err != nil {
 				return libcnb.Layer{}, fmt.Errorf("unable to contribute external configuration\n%w", err)
@@ -294,6 +298,19 @@ func (b Base) ContributeLogging(layer libcnb.Layer) error {
 	return nil
 }
 
+func (b Base) ContributeClasspathEntries(layer libcnb.Layer) error {
+	b.Logger.Bodyf("Adding profile-script 'add-classpath-entries.sh'")
+
+	libDir := fmt.Sprintf("%s/lib", layer.Path)
+	s, err := sherpa.TemplateFile("/add-classpath-entries.sh", map[string]interface{}{"libDir": libDir})
+	if err != nil {
+		return fmt.Errorf("unable to load add-classpath-entries.sh\n%w", err)
+	}
+
+	layer.Profile.Add("add-classpath-entries.sh", s)
+	return nil
+}
+
 func (Base) Name() string {
 	return "catalina-base"
 }

tomcat/base_test.go

@@ -110,6 +110,15 @@ printf "Tomcat Access Logging enabled\n"
 
 export JAVA_OPTS="${JAVA_OPTS} -Daccess.logging.enabled=true"
 `))
+		libDir := filepath.Join(layer.Path, "lib")
+		Expect(layer.Profile["add-classpath-entries.sh"]).To(Equal(fmt.Sprintf(`#!/bin/sh
+
+mkdir -p "%[1]s"
+while IFS=: read -d: -r path; do
+    printf "Linking $path to '%[1]v/$(basename $path)'\n"
+    ln -s "$path" "%[1]s/$(basename $path)"
+done <<< "${CLASSPATH}"
+`, libDir)))
 		Expect(filepath.Join(layer.Path, "lib", "stub-tomcat-lifecycle-support.jar")).To(BeARegularFile())
 		Expect(filepath.Join(layer.Path, "bin", "stub-tomcat-logging-support.jar")).To(BeARegularFile())
 		Expect(ioutil.ReadFile(filepath.Join(layer.Path, "bin", "setenv.sh"))).To(Equal([]byte(fmt.Sprintf(`# shellcheck disable=SC2034