1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
|
package reexec
import (
"fmt"
"os"
"os/exec"
"path/filepath"
)
var (
registeredInitializers = make(map[string]func())
initWasCalled = false
)
// 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]]
initWasCalled = true
if exists {
initializer()
return true
}
return false
}
func panicIfNotInitialized() {
if !initWasCalled {
// The reexec package is used to run subroutines in
// subprocesses which would otherwise have unacceptable side
// effects on the main thread. If you found this error, then
// your program uses a package which needs to do this. In
// order for that to work, main() should start with this
// boilerplate, or an equivalent:
// if reexec.Init() {
// return
// }
panic("a library subroutine needed to run a subprocess, but reexec.Init() was not called in main()")
}
}
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
}
|
