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environment.go
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environment.go
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package test
import (
"fmt"
"os"
"strings"
"github.com/shantanu-hashcash/go/support/errors"
)
type EnvironmentManager struct {
oldEnvironment, newEnvironment map[string]string
}
func NewEnvironmentManager() *EnvironmentManager {
env := &EnvironmentManager{}
env.oldEnvironment = make(map[string]string)
env.newEnvironment = make(map[string]string)
return env
}
func (envManager *EnvironmentManager) InitializeEnvironmentVariables(environmentVars map[string]string) error {
var env strings.Builder
for key, value := range environmentVars {
env.WriteString(fmt.Sprintf("%s=%s ", key, value))
}
// prepare env
for key, value := range environmentVars {
innerErr := envManager.Add(key, value)
if innerErr != nil {
return errors.Wrap(innerErr, fmt.Sprintf(
"failed to set envvar (%s=%s)", key, value))
}
}
return nil
}
// Add sets a new environment variable, saving the original value (if any).
func (envManager *EnvironmentManager) Add(key, value string) error {
// If someone pushes an environmental variable more than once, we don't want
// to lose the *original* value, so we're being careful here.
if _, ok := envManager.newEnvironment[key]; !ok {
if oldValue, ok := os.LookupEnv(key); ok {
envManager.oldEnvironment[key] = oldValue
}
}
envManager.newEnvironment[key] = value
return os.Setenv(key, value)
}
// Restore restores the environment prior to any modifications.
//
// You should probably use this alongside `defer` to ensure the global
// environment isn't modified for longer than you intend.
func (envManager *EnvironmentManager) Restore() {
for key := range envManager.newEnvironment {
if oldValue, ok := envManager.oldEnvironment[key]; ok {
os.Setenv(key, oldValue)
} else {
os.Unsetenv(key)
}
}
}