-
Notifications
You must be signed in to change notification settings - Fork 1.9k
/
discover.go
58 lines (48 loc) · 1.25 KB
/
discover.go
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
package discover
import (
"fmt"
"os"
"os/exec"
"path/filepath"
"runtime"
)
// Checks the current executable, then $GOPATH/bin, and finally the CWD, in that
// order. If it can't be found, an error is returned.
func NomadExecutable() (string, error) {
nomadExe := "nomad"
if runtime.GOOS == "windows" {
nomadExe = "nomad.exe"
}
// Check the current executable.
bin, err := os.Executable()
if err != nil {
return "", fmt.Errorf("Failed to determine the nomad executable: %v", err)
}
if _, err := os.Stat(bin); err == nil && isNomad(bin, nomadExe) {
return bin, nil
}
// Check the $PATH
if bin, err := exec.LookPath(nomadExe); err == nil {
return bin, nil
}
// Check the $GOPATH.
bin = filepath.Join(os.Getenv("GOPATH"), "bin", nomadExe)
if _, err := os.Stat(bin); err == nil {
return bin, nil
}
// Check the CWD.
pwd, err := os.Getwd()
if err != nil {
return "", fmt.Errorf("Could not find Nomad executable (%v): %v", nomadExe, err)
}
bin = filepath.Join(pwd, nomadExe)
if _, err := os.Stat(bin); err == nil {
return bin, nil
}
// Check CWD/bin
bin = filepath.Join(pwd, "bin", nomadExe)
if _, err := os.Stat(bin); err == nil {
return bin, nil
}
return "", fmt.Errorf("Could not find Nomad executable (%v)", nomadExe)
}