test: set PYTHONPATH for image-info on travis

Create a GetImageInfoCommand analogous to GetOsbuildCommand that
will adjust the PYTHONPATH for image-info on travis so that the
osbuild python module is accessible.

cmd/osbuild-image-tests/constants/constants-travis.go

@@ -2,7 +2,10 @@
 
 package constants
 
-import "os/exec"
+import (
+	"os"
+	"os/exec"
+)
 
 func GetOsbuildCommand(store, outputDirectory string) *exec.Cmd {
 	cmd := exec.Command(
@@ -18,6 +21,15 @@ func GetOsbuildCommand(store, outputDirectory string) *exec.Cmd {
 	return cmd
 }
 
+func GetImageInfoCommand(imagePath string) *exec.Cmd {
+	cmd := exec.Command(
+		"tools/image-info",
+		imagePath,
+	)
+	cmd.Env = append(os.Environ(), "PYTHONPATH=osbuild")
+	return cmd
+}
+
 var TestPaths = struct {
 	ImageInfo               string
 	PrivateKey              string

cmd/osbuild-image-tests/constants/constants.go

@@ -14,6 +14,13 @@ func GetOsbuildCommand(store, outputDirectory string) *exec.Cmd {
 	)
 }
 
+func GetImageInfoCommand(imagePath string) *exec.Cmd {
+	return exec.Command(
+		"/usr/libexec/osbuild-composer/image-info",
+		imagePath,
+	)
+}
+
 var TestPaths = struct {
 	ImageInfo               string
 	PrivateKey              string

cmd/osbuild-image-tests/main_test.go

@@ -73,7 +73,7 @@ func testImageInfo(t *testing.T, imagePath string, rawImageInfoExpected []byte)
 	err := json.Unmarshal(rawImageInfoExpected, &imageInfoExpected)
 	require.NoErrorf(t, err, "cannot decode expected image info: %#v", err)
 
-	cmd := exec.Command(constants.TestPaths.ImageInfo, imagePath)
+	cmd := constants.GetImageInfoCommand(imagePath)
 	cmd.Stderr = os.Stderr
 	reader, writer := io.Pipe()
 	cmd.Stdout = writer