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package sdktesting
import (
"os"
"runtime"
"strings"
)
// StashEnv stashes the current environment variables except variables listed in envToKeepx
// Returns an function to pop out old environment
func StashEnv(envToKeep ...string) func() {
if runtime.GOOS == "windows" {
envToKeep = append(envToKeep, "ComSpec")
envToKeep = append(envToKeep, "SYSTEM32")
envToKeep = append(envToKeep, "SYSTEMROOT")
}
envToKeep = append(envToKeep, "PATH")
extraEnv := getEnvs(envToKeep)
originalEnv := os.Environ()
os.Clearenv() // clear env
for key, val := range extraEnv {
os.Setenv(key, val)
}
return func() {
popEnv(originalEnv)
}
}
func getEnvs(envs []string) map[string]string {
extraEnvs := make(map[string]string)
for _, env := range envs {
if val, ok := os.LookupEnv(env); ok && len(val) > 0 {
extraEnvs[env] = val
}
}
return extraEnvs
}
// PopEnv takes the list of the environment values and injects them into the
// process's environment variable data. Clears any existing environment values
// that may already exist.
func popEnv(env []string) {
os.Clearenv()
for _, e := range env {
p := strings.SplitN(e, "=", 2)
k, v := p[0], ""
if len(p) > 1 {
v = p[1]
}
os.Setenv(k, v)
}
}