describing current functionality as tests

helmexec/runner.go

@@ -0,0 +1,30 @@
+package helmexec
+
+import (
+	"io/ioutil"
+	"os"
+	"os/exec"
+)
+
+const (
+	tmpPrefix = "helmfile-"
+	tmpSuffix = "-exec"
+)
+
+type Runner interface {
+	Execute(cmd string, args []string) ([]byte, error)
+}
+
+type CliRunner struct {}
+
+func (cli CliRunner) Execute(cmd string, args []string) ([]byte, error) {
+	dir, err := ioutil.TempDir("", tmpPrefix + cmd + tmpSuffix)
+	if err != nil {
+		return nil, err
+	}
+	defer os.RemoveAll(dir)
+
+	preparedCmd := exec.Command(cmd, args...)
+	preparedCmd.Dir = dir
+	return preparedCmd.CombinedOutput()
+}