Added support for build command chaining and error on missing wheel (#607)

## Changes
Added support for build command chaining and error on missing wheel

bundle/config/artifact.go

@@ -1,6 +1,7 @@
 package config
 
 import (
+	"bytes"
 	"context"
 	"fmt"
 	"os/exec"
@@ -40,10 +41,19 @@ func (a *Artifact) Build(ctx context.Context) ([]byte, error) {
 		return nil, fmt.Errorf("no build property defined")
 	}
 
-	buildParts := strings.Split(a.BuildCommand, " ")
+	out := make([][]byte, 0)
-	cmd := exec.CommandContext(ctx, buildParts[0], buildParts[1:]...)
+	commands := strings.Split(a.BuildCommand, " && ")
-	cmd.Dir = a.Path
+	for _, command := range commands {
-	return cmd.CombinedOutput()
+		buildParts := strings.Split(command, " ")
+		cmd := exec.CommandContext(ctx, buildParts[0], buildParts[1:]...)
+		cmd.Dir = a.Path
+		res, err := cmd.CombinedOutput()
+		if err != nil {
+			return res, err
+		}
+		out = append(out, res)
+	}
+	return bytes.Join(out, []byte{}), nil
 }
 
 func (a *Artifact) NormalisePaths() {

bundle/libraries/libraries.go

@@ -68,6 +68,10 @@ func findArtifactsAndMarkForUpload(ctx context.Context, lib *compute.Library, b
 		return err
 	}
 
+	if len(matches) == 0 && isLocalLibrary(lib) {
+		return fmt.Errorf("no library found for %s", libPath(lib))
+	}
+
 	for _, match := range matches {
 		af, err := findArtifactFileByLocalPath(match, b)
 		if err != nil {
@@ -105,3 +109,7 @@ func libPath(library *compute.Library) string {
 
 	return ""
 }
+
+func isLocalLibrary(library *compute.Library) bool {
+	return libPath(library) != ""
+}