61 lines
1.3 KiB
Go
61 lines
1.3 KiB
Go
package discover
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import (
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"fmt"
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"os"
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"os/exec"
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"path/filepath"
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"runtime"
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"github.com/kardianos/osext"
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)
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// Checks the current executable, then $GOPATH/bin, and finally the CWD, in that
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// order. If it can't be found, an error is returned.
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func NomadExecutable() (string, error) {
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nomadExe := "nomad"
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if runtime.GOOS == "windows" {
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nomadExe = "nomad.exe"
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}
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// Check the current executable.
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bin, err := osext.Executable()
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if err != nil {
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return "", fmt.Errorf("Failed to determine the nomad executable: %v", err)
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}
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if filepath.Base(bin) == nomadExe {
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return bin, nil
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}
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// Check the $PATH
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if bin, err := exec.LookPath(nomadExe); err == nil {
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return bin, nil
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}
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// Check the $GOPATH.
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bin = filepath.Join(os.Getenv("GOPATH"), "bin", nomadExe)
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if _, err := os.Stat(bin); err == nil {
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return bin, nil
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}
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// Check the CWD.
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pwd, err := os.Getwd()
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if err != nil {
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return "", fmt.Errorf("Could not find Nomad executable (%v): %v", nomadExe, err)
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}
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bin = filepath.Join(pwd, nomadExe)
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if _, err := os.Stat(bin); err == nil {
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return bin, nil
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}
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// Check CWD/bin
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bin = filepath.Join(pwd, "bin", nomadExe)
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if _, err := os.Stat(bin); err == nil {
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return bin, nil
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}
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return "", fmt.Errorf("Could not find Nomad executable (%v)", nomadExe)
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}
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