Function GetRootlessEUID

internal/rootless/rootless.go:18–25

GetRootlessEUID returns the UID of the current user (in the parent userNS, if any) Podman and similar software, in “rootless” configuration, when run as a non-root user, very early switches to a user namespace, where Geteuid() == 0 (but does not switch to a limited mount namespace); so, code relyin

()

// If Podman is setting up such a user namespace, it records the original UID in an
// environment variable, allowing us to make choices based on the actual user’s identity.
func GetRootlessEUID() int {
	euidEnv := os.Getenv("_CONTAINERS_ROOTLESS_UID")
	if euidEnv != "" {
		euid, _ := strconv.Atoi(euidEnv)
		return euid
	}
	return os.Geteuid()
}