Remote plugins plumbing.

Signed-off-by: David Calavera <david.calavera@gmail.com>

plugins/discovery_test.go

@@ -0,0 +1,108 @@
+package plugins
+
+import (
+	"fmt"
+	"io/ioutil"
+	"net"
+	"os"
+	"path"
+	"path/filepath"
+	"reflect"
+	"testing"
+)
+
+func TestUnknownLocalPath(t *testing.T) {
+	tmpdir, err := ioutil.TempDir("", "docker-test")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(tmpdir)
+
+	l := newLocalRegistry(filepath.Join(tmpdir, "unknown"))
+	_, err = l.Plugin("foo")
+	if err == nil || err != ErrNotFound {
+		t.Fatalf("Expected error for unknown directory")
+	}
+}
+
+func TestLocalSocket(t *testing.T) {
+	tmpdir, err := ioutil.TempDir("", "docker-test")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(tmpdir)
+	l, err := net.Listen("unix", filepath.Join(tmpdir, "echo.sock"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer l.Close()
+
+	r := newLocalRegistry(tmpdir)
+	p, err := r.Plugin("echo")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	pp, err := r.Plugin("echo")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !reflect.DeepEqual(p, pp) {
+		t.Fatalf("Expected %v, was %v\n", p, pp)
+	}
+
+	if p.Name != "echo" {
+		t.Fatalf("Expected plugin `echo`, got %s\n", p.Name)
+	}
+
+	addr := fmt.Sprintf("unix://%s/echo.sock", tmpdir)
+	if p.Addr != addr {
+		t.Fatalf("Expected plugin addr `%s`, got %s\n", addr, p.Addr)
+	}
+}
+
+func TestFileSpecPlugin(t *testing.T) {
+	tmpdir, err := ioutil.TempDir("", "docker-test")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	cases := []struct {
+		path string
+		name string
+		addr string
+		fail bool
+	}{
+		{filepath.Join(tmpdir, "echo.spec"), "echo", "unix://var/lib/docker/plugins/echo.sock", false},
+		{filepath.Join(tmpdir, "foo.spec"), "foo", "tcp://localhost:8080", false},
+		{filepath.Join(tmpdir, "bar.spec"), "bar", "localhost:8080", true}, // unknown transport
+	}
+
+	for _, c := range cases {
+		if err = os.MkdirAll(path.Dir(c.path), 0755); err != nil {
+			t.Fatal(err)
+		}
+		if err = ioutil.WriteFile(c.path, []byte(c.addr), 0644); err != nil {
+			t.Fatal(err)
+		}
+
+		r := newLocalRegistry(tmpdir)
+		p, err := r.Plugin(c.name)
+		if c.fail && err == nil {
+			continue
+		}
+
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		if p.Name != c.name {
+			t.Fatalf("Expected plugin `%s`, got %s\n", c.name, p.Name)
+		}
+
+		if p.Addr != c.addr {
+			t.Fatalf("Expected plugin addr `%s`, got %s\n", c.addr, p.Addr)
+		}
+		os.Remove(c.path)
+	}
+}