test: add basic integration tests

Signed-off-by: Justin Chadwell <me@jedevc.com>

vendor/github.com/moby/buildkit/util/testutil/integration/azurite.go

@@ -0,0 +1,89 @@
+package integration
+
+import (
+	"fmt"
+	"net"
+	"net/http"
+	"os"
+	"os/exec"
+	"testing"
+	"time"
+
+	"github.com/pkg/errors"
+)
+
+const (
+	azuriteBin = "azurite-blob"
+)
+
+type AzuriteOpts struct {
+	AccountName string
+	AccountKey  string
+}
+
+func NewAzuriteServer(t *testing.T, sb Sandbox, opts AzuriteOpts) (address string, cl func() error, err error) {
+	t.Helper()
+
+	if _, err := exec.LookPath(azuriteBin); err != nil {
+		return "", nil, errors.Wrapf(err, "failed to lookup %s binary", azuriteBin)
+	}
+
+	deferF := &multiCloser{}
+	cl = deferF.F()
+
+	defer func() {
+		if err != nil {
+			deferF.F()()
+			cl = nil
+		}
+	}()
+
+	l, err := net.Listen("tcp", "localhost:0")
+	if err != nil {
+		return "", nil, err
+	}
+
+	addr := l.Addr().String()
+	if err = l.Close(); err != nil {
+		return "", nil, err
+	}
+	host, port, err := net.SplitHostPort(addr)
+	if err != nil {
+		return "", nil, err
+	}
+	address = fmt.Sprintf("http://%s/%s", addr, opts.AccountName)
+
+	// start server
+	cmd := exec.Command(azuriteBin, "--disableProductStyleUrl", "--blobHost", host, "--blobPort", port, "--location", t.TempDir())
+	cmd.Env = append(os.Environ(), []string{
+		"AZURITE_ACCOUNTS=" + opts.AccountName + ":" + opts.AccountKey,
+	}...)
+	azuriteStop, err := startCmd(cmd, sb.Logs())
+	if err != nil {
+		return "", nil, err
+	}
+	if err = waitAzurite(address, 15*time.Second); err != nil {
+		azuriteStop()
+		return "", nil, errors.Wrapf(err, "azurite did not start up: %s", formatLogs(sb.Logs()))
+	}
+	deferF.append(azuriteStop)
+
+	return
+}
+
+func waitAzurite(address string, d time.Duration) error {
+	step := 1 * time.Second
+	i := 0
+	for {
+		if resp, err := http.Get(fmt.Sprintf("%s?comp=list", address)); err == nil {
+			resp.Body.Close()
+			break
+		}
+		i++
+		if time.Duration(i)*step > d {
+			return errors.Errorf("failed dialing: %s", address)
+		}
+		time.Sleep(step)
+	}
+	return nil
+}