CLI: stop and delete should error on not found containers (#878)

Same as we'd done with kill.

```
➜  container git:(stop-kill-throw-error) ✗ ./bin/container stop foo bar baz
Warning! Running debug build. Performance may be degraded.
Error: internalError: "failed to stop container" (cause: "notFound: "container with ID baz not found"")
internalError: "failed to stop container" (cause: "notFound: "container with ID bar not found"")
internalError: "failed to stop container" (cause: "notFound: "container with ID foo not found"")
➜  container git:(stop-kill-throw-error) ✗ ./bin/container kill foo bar baz
Warning! Running debug build. Performance may be degraded.
Error: internalError: "failed to kill container" (cause: "notFound: "container with ID foo not found"")
internalError: "failed to kill container" (cause: "notFound: "container with ID bar not found"")
internalError: "failed to kill container" (cause: "notFound: "container with ID baz not found"")
➜  container git:(stop-kill-throw-error) ✗ ./bin/container delete foo bar baz
Warning! Running debug build. Performance may be degraded.
Error: internalError: "failed to delete container" (cause: "notFound: "container with ID foo not found"")
internalError: "failed to delete container" (cause: "notFound: "container with ID baz not found"")
internalError: "failed to delete container" (cause: "notFound: "container with ID bar not found"")
```

Makefile

@@ -207,6 +207,7 @@ integration: init-block
 		$(SWIFT) test -c $(BUILD_CONFIGURATION) $(SWIFT_CONFIGURATION) --filter TestCLIVolumes || exit_code=1 ; \
 		$(SWIFT) test -c $(BUILD_CONFIGURATION) $(SWIFT_CONFIGURATION) --filter TestCLIKernelSet || exit_code=1 ; \
 		$(SWIFT) test -c $(BUILD_CONFIGURATION) $(SWIFT_CONFIGURATION) --filter TestCLIAnonymousVolumes || exit_code=1 ; \
+		$(SWIFT) test -c $(BUILD_CONFIGURATION) $(SWIFT_CONFIGURATION) --filter TestCLINotFound || exit_code=1 ; \
 		$(SWIFT) test -c $(BUILD_CONFIGURATION) $(SWIFT_CONFIGURATION) --filter TestCLINoParallelCases || exit_code=1 ; \
 		echo Ensuring apiserver stopped after the CLI integration tests ; \
 		scripts/ensure-container-stopped.sh ; \

Sources/ContainerCommands/Container/ContainerDelete.swift

@@ -54,49 +54,29 @@ extension Application {
         }
 
         public mutating func run() async throws {
-            let set = Set<String>(containerIds)
             let client = ContainerClient()
-            var containers = [ContainerSnapshot]()
+            let force = self.force
 
+            let containers: [String]
             if all {
-                containers = try await client.list()
-            } else {
-                let ctrs = try await client.list()
-                containers = ctrs.filter { c in
-                    set.contains(c.id)
-                }
-                // If one of the containers requested isn't present, let's throw. We don't need to do
-                // this for --all as --all should be perfectly usable with no containers to remove; otherwise,
-                // it'd be quite clunky.
-                if containers.count != set.count {
-                    let missing = set.filter { id in
-                        !containers.contains { c in
-                            c.id == id
-                        }
+                containers = try await client.list().compactMap { c in
+                    // Skip running containers when using --all without --force
+                    if c.status == .running && !force {
+                        return nil
                     }
-                    throw ContainerizationError(
-                        .notFound,
-                        message: "failed to delete one or more containers: \(missing)"
-                    )
+                    return c.id
                 }
+            } else {
+                containers = containerIds
             }
 
             var errors: [any Error] = []
-            let force = self.force
-            let all = self.all
             try await withThrowingTaskGroup(of: (any Error)?.self) { group in
                 for container in containers {
                     group.addTask {
                         do {
-                            if container.status == .running && !force {
-                                guard all else {
-                                    throw ContainerizationError(.invalidState, message: "container is running")
-                                }
-                                return nil  // Skip running container when using --all
-                            }
-
-                            try await client.delete(id: container.id, force: force)
-                            print(container.id)
+                            try await client.delete(id: container, force: force)
+                            print(container)
                             return nil
                         } catch {
                             return error

Sources/ContainerCommands/Container/ContainerStop.swift

@@ -56,15 +56,13 @@ extension Application {
         }
 
         public mutating func run() async throws {
-            let set = Set<String>(containerIds)
             let client = ContainerClient()
-            var containers = [ContainerSnapshot]()
+
+            let containers: [String]
             if self.all {
-                containers = try await client.list()
+                containers = try await client.list().map { $0.id }
             } else {
-                containers = try await client.list().filter { c in
-                    set.contains(c.id)
-                }
+                containers = containerIds
             }
 
             let opts = ContainerStopOptions(
@@ -78,14 +76,14 @@ extension Application {
             )
         }
 
-        static func stopContainers(client: ContainerClient, containers: [ContainerSnapshot], stopOptions: ContainerStopOptions) async throws {
+        static func stopContainers(client: ContainerClient, containers: [String], stopOptions: ContainerStopOptions) async throws {
             var errors: [any Error] = []
             await withTaskGroup(of: (any Error)?.self) { group in
                 for container in containers {
                     group.addTask {
                         do {
-                            try await client.stop(id: container.id, opts: stopOptions)
-                            print(container.id)
+                            try await client.stop(id: container, opts: stopOptions)
+                            print(container)
                             return nil
                         } catch {
                             return error

Sources/ContainerCommands/System/SystemStop.swift

@@ -64,7 +64,7 @@ extension Application {
                 let client = ContainerClient()
                 log.info("stopping containers", metadata: ["stopTimeoutSeconds": "\(Self.stopTimeoutSeconds)"])
                 do {
-                    let containers = try await client.list()
+                    let containers = try await client.list().map { $0.id }
                     let signal = try Signals.parseSignal("SIGTERM")
                     let opts = ContainerStopOptions(timeoutInSeconds: Self.stopTimeoutSeconds, signal: signal)
                     try await ContainerStop.stopContainers(

Tests/CLITests/Subcommands/Containers/TestCLINotFound.swift

@@ -0,0 +1,37 @@
+//===----------------------------------------------------------------------===//
+// Copyright © 2026 Apple Inc. and the container project authors.
+//
+// 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
+//
+//   https://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.
+//===----------------------------------------------------------------------===//
+
+import Foundation
+import Testing
+
+/// Tests that stop, kill, and delete return errors for non-existent containers.
+class TestCLINotFound: CLITest {
+
+    @Test func testStopNonExistentContainer() throws {
+        let (_, _, _, status) = try run(arguments: ["stop", "does-not-exist"])
+        #expect(status != 0, "stop should fail for a non-existent container")
+    }
+
+    @Test func testKillNonExistentContainer() throws {
+        let (_, _, _, status) = try run(arguments: ["kill", "does-not-exist"])
+        #expect(status != 0, "kill should fail for a non-existent container")
+    }
+
+    @Test func testDeleteNonExistentContainer() throws {
+        let (_, _, _, status) = try run(arguments: ["delete", "does-not-exist"])
+        #expect(status != 0, "delete should fail for a non-existent container")
+    }
+}