Binary Environment (#256)

Adds a fission environment for arbitrary linux binaries.

environments/binary/env.go

@@ -0,0 +1,47 @@
+package main
+
+import (
+	"fmt"
+	"strings"
+)
+
+// Utility functions for working with environment variables
+type Env struct {
+	Vars []*EnvVar
+}
+
+type EnvVar struct {
+	Key string
+	Val string
+}
+
+func FromString(rawEnvVar string) *EnvVar {
+	parts := strings.SplitN(rawEnvVar, "=", 2)
+	return &EnvVar{parts[0], parts[1]}
+}
+
+func (ev *EnvVar) ToString() string {
+	return fmt.Sprintf("%s=%s", ev.Key, ev.Val)
+}
+
+func (e *Env) SetEnv(envVar *EnvVar) {
+	e.Vars = append(e.Vars, envVar)
+}
+
+func (e *Env) ToStringEnv() []string {
+	var result []string
+	for _, envVar := range e.Vars {
+		result = append(result, envVar.ToString())
+	}
+	return result
+}
+
+func NewEnv(stringEnv []string) *Env {
+	env := &Env{}
+	if stringEnv != nil {
+		for _, rawEnvVar := range stringEnv {
+			env.SetEnv(FromString(rawEnvVar))
+		}
+	}
+	return env
+}