Add initial integration tests framework

Signed-off-by: Kenfe-Mickael Laventure <mickael.laventure@gmail.com>

integration-test/bundle_utils_test.go

@@ -0,0 +1,107 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"reflect"
+
+	ocs "github.com/opencontainers/specs/specs-go"
+)
+
+var (
+	bundlesDir      = filepath.Join("test-artifacts", "oci-bundles")
+	refOciSpecsPath = filepath.Join(bundlesDir, "config.json")
+)
+
+type OciProcessArgs struct {
+	Cmd  string
+	Args []string
+}
+
+type Bundle struct {
+	Source string
+	Name   string
+	Spec   ocs.Spec
+	Path   string
+}
+
+var bundleMap map[string]Bundle
+
+// untarRootfs untars the given `source` tarPath into `destination/rootfs`
+func untarRootfs(source string, destination string) error {
+	destination = filepath.Join(destination, "rootfs")
+	if err := os.MkdirAll(destination, 0755); err != nil {
+		return nil
+	}
+	tar := exec.Command("tar", "-C", destination, "-xf", source)
+	return tar.Run()
+}
+
+// CreateBundleWithFilter generate a new oci-bundle named `name` from
+// the provide `source` rootfs. It starts from the default spec
+// generated by `runc spec`, overrides the `spec.Process.Args` value
+// with `args` and set `spec.Process.Terminal` to false. It then apply
+// `filter()` to the resulting spec if it is provided.
+func CreateBundleWithFilter(source, name string, args []string, filter func(spec *ocs.Spec)) error {
+	// Generate the spec
+	var spec ocs.Spec
+	if f, err := os.Open(refOciSpecsPath); err != nil {
+		return fmt.Errorf("Failed to open default spec: %v", err)
+	} else {
+		if err := json.NewDecoder(f).Decode(&spec); err != nil {
+			return fmt.Errorf("Failed to load default spec: %v", err)
+		}
+		f.Close()
+	}
+
+	spec.Process.Args = args
+	spec.Process.Terminal = false
+	if filter != nil {
+		filter(&spec)
+	}
+
+	bundlePath := filepath.Join(bundlesDir, name)
+	nb := Bundle{source, name, spec, bundlePath}
+
+	// Check that we don't already have such a bundle
+	if b, ok := bundleMap[name]; ok {
+		if reflect.DeepEqual(b, nb) == false {
+			return fmt.Errorf("A bundle name named '%s' already exist but with different properties! %#v != %#v",
+				name, b, nb)
+		}
+		return nil
+	}
+
+	// Nothing should be there, but just in case
+	os.RemoveAll(bundlePath)
+
+	if err := untarRootfs(filepath.Join(archivesDir, source+".tar"), bundlePath); err != nil {
+		return fmt.Errorf("Failed to untar %s.tar: %v", source, err)
+	}
+
+	// create a place for the io fifo
+	if err := os.Mkdir(filepath.Join(bundlePath, "io"), 0755); err != nil {
+		return fmt.Errorf("Failed to create bundle io directory: %v", err)
+	}
+
+	// Write the updated spec to the right location
+	config, e := os.Create(filepath.Join(bundlePath, "config.json"))
+	if e != nil {
+		return fmt.Errorf("Failed to create oci spec: %v", e)
+	}
+	defer config.Close()
+
+	if err := json.NewEncoder(config).Encode(&spec); err != nil {
+		return fmt.Errorf("Failed to encore oci spec: %v", e)
+	}
+
+	bundleMap[name] = nb
+	return nil
+}
+
+func CreateBusyboxBundle(name string, args []string) error {
+	return CreateBundleWithFilter("busybox", name, args, nil)
+}