Support Docker's credsStore (#591)

This way for #581 we don't need to specify a fully quialified URL and can simply use the following `~/.docker/config.json`:

```json
{
	"credsStore": "ecr-login"
}
```

Related to https://github.com/docker/cli/issues/2928

Sources/tart/Commands/Run.swift

@@ -91,7 +91,7 @@ struct Run: AsyncParsableCommand {
   """, discussion: """
   Specify "list" as an interface name (--net-bridged=list) to list the available bridged interfaces.
   """, valueName: "interface name"))
-  var netBridged: [String]
+  var netBridged: [String] = []
 
   @Flag(help: ArgumentHelp("Use software networking instead of the default shared (NAT) networking",
                            discussion: "Learn how to configure Softnet for use with Tart here: https://github.com/cirruslabs/softnet"))

Sources/tart/Credentials/DockerConfigCredentialsProvider.swift

@@ -15,6 +15,10 @@ class DockerConfigCredentialsProvider: CredentialsProvider {
       return try executeHelper(binaryName: "docker-credential-\(helperProgram)", host: host)
     }
 
+    if let defaultCredsStore = config.credsStore {
+      return try executeHelper(binaryName: "docker-credential-\(defaultCredsStore)", host: host)
+    }
+
     return nil
   }
 
@@ -59,6 +63,7 @@ class DockerConfigCredentialsProvider: CredentialsProvider {
 struct DockerConfig: Codable {
   var auths: Dictionary<String, DockerAuthConfig>? = Dictionary()
   var credHelpers: Dictionary<String, String>? = Dictionary()
+  var credsStore: String? = nil
 }
 
 struct DockerAuthConfig: Codable {

integration-tests/requirements.txt

@@ -3,3 +3,4 @@ testcontainers
 requests
 bitmath
 pytest-dependency
+paramiko

integration-tests/tart.py

@@ -7,10 +7,9 @@ class Tart:
     def __init__(self):
         self.tmp_dir = tempfile.TemporaryDirectory(dir=os.environ.get("CIRRUS_WORKING_DIR"))
 
-        # Link to the users IPSW cache to make things faster
-        src = os.path.join(os.path.expanduser("~"), ".tart", "cache", "IPSWs")
-        dst = os.path.join(self.tmp_dir.name, "cache", "IPSWs")
-        os.makedirs(os.path.join(self.tmp_dir.name, "cache"))
+        # Link to the users cache to make things faster
+        src = os.path.join(os.path.expanduser("~"), ".tart", "cache")
+        dst = os.path.join(self.tmp_dir.name, "cache")
         os.symlink(src, dst)
 
     def __enter__(self):
@@ -31,3 +30,9 @@ class Tart:
         completed_process.check_returncode()
 
         return completed_process.stdout.decode("utf-8"), completed_process.stderr.decode("utf-8")
+
+    def run_async(self, args) -> subprocess.Popen:
+        env = os.environ.copy()
+        env.update({"TART_HOME": self.tmp_dir.name})
+
+        return subprocess.Popen(["tart"] + args, env=env)

integration-tests/test_clone.py

@@ -6,5 +6,5 @@ def test_clone(tart):
     tart.run(["clone", "debian", "ubuntu"])
 
     # Ensure that we have now 2 VMs
-    stdout, _, = tart.run(["list", "--quiet"])
+    stdout, _, = tart.run(["list", "--source", "local", "--quiet"])
     assert stdout == "debian\nubuntu\n"

integration-tests/test_create.py

@@ -3,7 +3,7 @@ def test_create_macos(tart):
     tart.run(["create", "--from-ipsw", "latest", "macos-vm"])
 
     # Ensure that the VM was created
-    stdout, _ = tart.run(["list", "--quiet"])
+    stdout, _ = tart.run(["list", "--source", "local", "--quiet"])
     assert stdout == "macos-vm\n"
 
 
@@ -12,5 +12,5 @@ def test_create_linux(tart):
     tart.run(["create", "--linux", "linux-vm"])
 
     # Ensure that the VM was created
-    stdout, _ = tart.run(["list", "--quiet"])
+    stdout, _ = tart.run(["list", "--source", "local", "--quiet"])
     assert stdout == "linux-vm\n"

integration-tests/test_delete.py

@@ -3,12 +3,12 @@ def test_delete(tart):
     tart.run(["create", "--linux", "debian"])
 
     # Ensure that the VM exists
-    stdout, _, = tart.run(["list", "--quiet"])
+    stdout, _, = tart.run(["list", "--source", "local", "--quiet"])
     assert stdout == "debian\n"
 
     # Delete the VM
     tart.run(["delete", "debian"])
 
     # Ensure that the VM was removed
-    stdout, _, = tart.run(["list", "--quiet"])
+    stdout, _, = tart.run(["list", "--source", "local", "--quiet"])
     assert stdout == ""

integration-tests/test_rename.py

@@ -6,5 +6,5 @@ def test_rename(tart):
     tart.run(["rename", "debian", "ubuntu"])
 
     # Ensure that the VM is now named "ubuntu"
-    stdout, _, = tart.run(["list", "--quiet"])
+    stdout, _, = tart.run(["list", "--source", "local", "--quiet"])
     assert stdout == "ubuntu\n"

integration-tests/test_run.py

@@ -0,0 +1,30 @@
+import uuid
+
+from paramiko.client import SSHClient, AutoAddPolicy
+
+
+def test_run(tart):
+    vm_name = f"integration-test-run-{uuid.uuid4()}"
+
+    # Instantiate a VM with admin:admin SSH access
+    tart.run(["clone", "ghcr.io/cirruslabs/macos-ventura-base:latest", vm_name])
+
+    # Run the VM asynchronously
+    tart_run_process = tart.run_async(["run", vm_name])
+
+    # Obtain the VM's IP
+    stdout, _ = tart.run(["ip", vm_name, "--wait", "120"])
+    ip = stdout.strip()
+
+    # Connect to the VM over SSH and shutdown it
+    client = SSHClient()
+    client.set_missing_host_key_policy(AutoAddPolicy)
+    client.connect(ip, username="admin", password="admin")
+    client.exec_command("sudo shutdown -h now")
+
+    # Wait for the "tart run" to finish successfully
+    tart_run_process.wait()
+    assert tart_run_process.returncode == 0
+
+    # Delete the VM
+    _, _ = tart.run(["delete", vm_name])