Prototype with single host server and no admin panel (#2)

Reviewed-on: wrenn/sandbox#2
Co-authored-by: pptx704 <rafeed@omukk.dev>
Co-committed-by: pptx704 <rafeed@omukk.dev>

envd/internal/execcontext/context.go

@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: Apache-2.0
+
+package execcontext
+
+import (
+	"errors"
+
+	"git.omukk.dev/wrenn/sandbox/envd/internal/utils"
+)
+
+type Defaults struct {
+	EnvVars *utils.Map[string, string]
+	User    string
+	Workdir *string
+}
+
+func ResolveDefaultWorkdir(workdir string, defaultWorkdir *string) string {
+	if workdir != "" {
+		return workdir
+	}
+
+	if defaultWorkdir != nil {
+		return *defaultWorkdir
+	}
+
+	return ""
+}
+
+func ResolveDefaultUsername(username *string, defaultUsername string) (string, error) {
+	if username != nil {
+		return *username, nil
+	}
+
+	if defaultUsername != "" {
+		return defaultUsername, nil
+	}
+
+	return "", errors.New("username not provided")
+}