wip lxcconfig tests

lxcconfig/BUILD

@@ -12,6 +12,7 @@ go_test(
     srcs = ["lxcconfig_test.go"],
     embed = [":go_default_library"],
     deps = [
+        "//src/undocker/internal/tartest:go_default_library",
         "@com_github_stretchr_testify//assert:go_default_library",
         "@com_github_stretchr_testify//require:go_default_library",
     ],

lxcconfig/lxcconfig.go

@@ -57,8 +57,8 @@ type (
 )
 
 // LXCConfig accepts a Docker container image and returns lxc configuration.
-func LXCConfig(in io.ReadSeeker, wr io.Writer) error {
+func LXCConfig(rd io.ReadSeeker, wr io.Writer) error {
-	dockerCfg, err := getDockerConfig(in)
+	dockerCfg, err := getDockerConfig(rd)
 	if err != nil {
 		return err
 	}
@@ -90,9 +90,9 @@ func (l lxcConfig) WriteTo(wr io.Writer) error {
 	return _lxcTemplate.Execute(wr, l)
 }
 
-func getDockerConfig(in io.ReadSeeker) (dockerConfig, error) {
+func getDockerConfig(rd io.ReadSeeker) (dockerConfig, error) {
-	tr := tar.NewReader(in)
+	tr := tar.NewReader(rd)
-	// get offsets to all json files in the archive
+	// get offsets to all json files rd the archive
 	jsonOffsets := map[string]int64{}
 	for {
 		hdr, err := tr.Next()
@@ -102,19 +102,19 @@ func getDockerConfig(in io.ReadSeeker) (dockerConfig, error) {
 		if hdr.Typeflag != tar.TypeReg {
 			continue
 		}
-		if !strings.HasSuffix(_json, hdr.Name) {
+		if !strings.HasSuffix(hdr.Name, _json) {
 			continue
 		}
-		here, err := in.Seek(0, io.SeekCurrent)
+		here, err := rd.Seek(0, io.SeekCurrent)
 		if err != nil {
 			return dockerConfig{}, err
 		}
 		jsonOffsets[hdr.Name] = here
 	}
 
-	// manifest is the docker manifest in the image
+	// manifest is the docker manifest rd the image
 	var manifest dockerManifest
-	if err := parseJSON(in, jsonOffsets, _manifestJSON, &manifest); err != nil {
+	if err := parseJSON(rd, jsonOffsets, _manifestJSON, &manifest); err != nil {
 		return dockerConfig{}, err
 	}
 	if len(manifest) == 0 {
@@ -122,22 +122,24 @@ func getDockerConfig(in io.ReadSeeker) (dockerConfig, error) {
 	}
 
 	var config dockerConfig
-	if err := parseJSON(in, jsonOffsets, manifest[0].Config, &config); err != nil {
+	if err := parseJSON(rd, jsonOffsets, manifest[0].Config, &config); err != nil {
 		return dockerConfig{}, err
 	}
 
 	return config, nil
 }
 
-func parseJSON(in io.ReadSeeker, offsets map[string]int64, fname string, c interface{}) error {
+//TODO: don't seek to files, read them.
+func parseJSON(rd io.ReadSeeker, offsets map[string]int64, fname string, c interface{}) error {
 	configOffset, ok := offsets[fname]
+	fmt.Printf("jumping to %s in %x\n", fname, configOffset)
 	if !ok {
 		return fmt.Errorf("file %s not found", fname)
 	}
-	if _, err := in.Seek(configOffset, io.SeekStart); err != nil {
+	if _, err := rd.Seek(configOffset, io.SeekStart); err != nil {
 		return fmt.Errorf("seek to %s: %w", fname, err)
 	}
-	tr := tar.NewReader(in)
+	tr := tar.NewReader(rd)
 	if _, err := tr.Next(); err != nil {
 		return err
 	}

lxcconfig/lxcconfig_test.go

@@ -1,14 +1,18 @@
 package lxcconfig
 
 import (
+	"archive/tar"
 	"bytes"
+	"encoding/json"
 	"testing"
 
+	"github.com/motiejus/code/undocker/internal/tartest"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
 
 func TestLXCConfig(t *testing.T) {
+
 	tests := []struct {
 		name   string
 		docker dockerConfig
@@ -24,6 +28,7 @@ lxc.architecture = amd64
 lxc.execute.cmd = '/bin/sh'
 `,
 		},
+		/*
 					{
 						name: "all fields",
 						docker: dockerConfig{
@@ -46,13 +51,36 @@ lxc.environment = LONGNAME="Foo Bar"
 			lxc.environment = SHELL=/bin/tcsh
 			`,
 					},
+		*/
 	}
 
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
+			manifest := tartest.File{
+				Name:     "manifest.json",
+				Contents: bytes.NewBufferString(`[{"Config":"config.json"}]`),
+			}
+			_ = manifest
+			archive := tartest.Tarball{
+				manifest,
+				//tt.docker,
+			}
+			in := bytes.NewReader(archive.Buffer().Bytes())
 			var buf bytes.Buffer
-			require.NoError(t, docker2lxc(tt.docker).WriteTo(&buf))
+			require.NoError(t, LXCConfig(in, &buf))
 			assert.Equal(t, tt.want, string(buf.Bytes()))
 		})
 	}
 }
+
+// Helpers
+func (c dockerConfig) Tar(tw *tar.Writer) error {
+	configJSON, err := json.MarshalIndent(c, "", "  ")
+	if err != nil {
+		return err
+	}
+	return tartest.File{
+		Name:     "config.json",
+		Contents: bytes.NewBuffer(configJSON),
+	}.Tar(tw)
+}

rootfs/rootfs_test.go

@@ -187,9 +187,7 @@ func TestRootFS(t *testing.T) {
 }
 
 // Helpers
-type (
+type manifest []string
-	manifest []string
-)
 
 func (m manifest) Tar(tw *tar.Writer) error {
 	b, err := json.Marshal(dockerManifestJSON{{Layers: m}})