fix: Execute correct %appscript and add test for instance start --app

CHANGELOG.md

@@ -28,6 +28,10 @@
   given the `--app <appname>` flag, and will automatically invoke the relevant
   SCIF command.
 
+### Bug Fixes
+
+- Execute correct `%appstart` script when using `instance start` with `--app`.
+
 ## 4.0.2 \[2023-11-16\]
 
 ### Changed defaults / behaviours

e2e/instance/instance.go

@@ -55,7 +55,38 @@ func (c *ctx) testBasicEchoServer(t *testing.T) {
 				return
 			}
 			// Try to contact the instance.
-			echo(t, instanceStartPort)
+			echo(t, instanceStartPort, false)
+			c.stopInstance(t, instanceName)
+		}),
+		e2e.ExpectExit(0),
+	)
+}
+
+// Test that a basic reverse-echo server defined in an appstart script can be started,
+// communicated with, and stopped.
+func (c *ctx) testAppEchoServer(t *testing.T) {
+	const instanceName = "echoApp"
+
+	args := []string{
+		"--app",
+		"foo",
+		c.env.ImagePath,
+		instanceName,
+		strconv.Itoa(instanceStartPort),
+	}
+
+	// Start the instance.
+	c.env.RunSingularity(
+		t,
+		e2e.WithProfile(c.profile),
+		e2e.WithCommand("instance start"),
+		e2e.WithArgs(args...),
+		e2e.PostRun(func(t *testing.T) {
+			if t.Failed() {
+				return
+			}
+			// Try to contact the instance.
+			echo(t, instanceStartPort, true)
 			c.stopInstance(t, instanceName)
 		}),
 		e2e.ExpectExit(0),
@@ -77,7 +108,7 @@ func (c *ctx) testCreateManyInstances(t *testing.T) {
 			e2e.WithCommand("instance start"),
 			e2e.WithArgs(c.env.ImagePath, instanceName, strconv.Itoa(port)),
 			e2e.PostRun(func(t *testing.T) {
-				echo(t, port)
+				echo(t, port, false)
 			}),
 			e2e.ExpectExit(0),
 		)
@@ -403,6 +434,7 @@ func E2ETests(env e2e.TestEnv) testhelper.Tests {
 				function func(*testing.T)
 			}{
 				{"BasicEchoServer", c.testBasicEchoServer},
+				{"AppEchoServer", c.testAppEchoServer},
 				{"BasicOptions", c.testBasicOptions},
 				{"Contain", c.testContain},
 				{"InstanceFromURI", c.testInstanceFromURI},

e2e/instance/instance_utils.go

@@ -94,10 +94,18 @@ func (c *ctx) expectInstance(t *testing.T, name string, nb int) {
 	)
 }
 
-// Sends a deterministic message to an echo server and expects the same message
-// in response.
-func echo(t *testing.T, port int) {
-	const message = "b40cbeaaea293f7e8bd40fb61f389cfca9823467\n"
+// Sends a deterministic message to an echo server and expects the same, or a
+// reversed, message in response.
+func echo(t *testing.T, port int, reverse bool) {
+	const (
+		message         = "b40cbeaaea293f7e8bd40fb61f389cfca9823467\n"
+		reversedMessage = "7643289acfc983f16bf04db8e7f392aeaaebc04b\n"
+	)
+
+	expectResponse := message
+	if reverse {
+		expectResponse = reversedMessage
+	}
 
 	// give it some time for responding, attempt 10 times by
 	// waiting 100 millisecond between each try
@@ -114,8 +122,9 @@ func echo(t *testing.T, port int) {
 		fmt.Fprint(sock, message)
 
 		response, responseErr := bufio.NewReader(sock).ReadString('\n')
-		if responseErr != nil || response != message {
-			t.Errorf("Bad response: err = %v, response = %v", responseErr, response)
+
+		if responseErr != nil || response != expectResponse {
+			t.Errorf("Bad response: err = %v, response %q != %q", responseErr, response, expectResponse)
 		}
 		break
 	}

e2e/testdata/Singularity

@@ -59,9 +59,11 @@ export HELLOTHISIS
 
 %appstart foo
     echo "STARTING FOO"
-    exec nc -l -k -p $1 -e /bin/cat
+    # Echo back reverse of strings sent on port $1
+    exec nc -l -k -p $1 -e /bin/rev
 
 %startscript
+    # Echo back strings sent on port $1
     exec nc -l -k -p $1 -e /bin/cat
 
 %runscript

internal/pkg/util/fs/files/action_scripts.go

@@ -203,7 +203,13 @@ test)
     sylog info "No test script found in container, exiting"
     exit 0 ;;
 start)
-    if test -x "/.singularity.d/startscript"; then
+    if test -n "${SINGULARITY_APPNAME:-}"; then
+        if test -x "/scif/apps/${SINGULARITY_APPNAME:-}/scif/startscript"; then
+            exec "/scif/apps/${SINGULARITY_APPNAME:-}/scif/startscript" "$@"
+        fi
+        sylog error "No startscript for contained app: ${SINGULARITY_APPNAME:-}"
+        exit 1
+    elif test -x "/.singularity.d/startscript"; then
         exec "/.singularity.d/startscript" "$@"
     fi