forked from hashicorp/nomad
/
discover.go
52 lines (42 loc) · 1.08 KB
/
discover.go
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package discover
import (
"fmt"
"os"
"path/filepath"
"github.com/kardianos/osext"
)
const (
nomadExe = "nomad"
)
// 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) {
// Check the current executable.
bin, err := osext.Executable()
if err != nil {
return "", fmt.Errorf("Failed to determine the nomad executable: %v", err)
}
if filepath.Base(bin) == nomadExe {
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", 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)
}