package reexec // import "github.com/docker/docker/pkg/reexec" import ( "fmt" "os" "os/exec" "path/filepath" ) var registeredInitializers = make(map[string]func()) // Register adds an initialization func under the specified name func Register(name string, initializer func()) { if _, exists := registeredInitializers[name]; exists { panic(fmt.Sprintf("reexec func already registered under name %q", name)) } registeredInitializers[name] = initializer } // Init is called as the first part of the exec process and returns true if an // initialization function was called. func Init() bool { initializer, exists := registeredInitializers[os.Args[0]] if exists { initializer() return true } return false } func naiveSelf() string { name := os.Args[0] if filepath.Base(name) == name { if lp, err := exec.LookPath(name); err == nil { return lp } } // handle conversion of relative paths to absolute if absName, err := filepath.Abs(name); err == nil { return absName } // if we couldn't get absolute name, return original // (NOTE: Go only errors on Abs() if os.Getwd fails) return name }