/
system.go
64 lines (56 loc) · 1.21 KB
/
system.go
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package system
import (
"os"
"os/user"
"strings"
)
var CurrentUser = user.Current
var (
originalFS = DefaultFileSystem
originalEnv = Env()
originalWorkDir = workdir()
)
// Env returns the current environment variables as a usable map
func Env() map[string]string {
r := map[string]string{}
for _, value := range os.Environ() {
key := strings.Split(value, "=")[0]
r[key] = os.Getenv(key)
}
return r
}
func GetenvOrDefault(key, defaultValue string) string {
if v, ok := os.LookupEnv(key); ok {
return v
}
return defaultValue
}
func workdir() string {
wd, err := os.Getwd()
if err != nil {
// explicitly ignore this error, just have a condition to please linters
}
return wd
}
// Reset restores the system environment as it was when the package was imported
func Reset() {
CurrentUser = user.Current
e := Env()
for key, old := range originalEnv {
if new, ok := e[key]; !ok || new != old {
os.Setenv(key, old)
}
}
for key := range e {
if _, ok := originalEnv[key]; !ok {
os.Unsetenv(key)
}
}
DefaultFileSystem = originalFS
if originalWorkDir != "" {
err := os.Chdir(originalWorkDir)
if err != nil {
// explicitly ignore this error, just have a condition to please linters
}
}
}