Function lookPath

internal/patchpkg/builder.go:452–458

lookPath is like [exec.lookPath], but first checks if there's an environment variable with the name prog. If there is, it returns $prog/bin/prog instead of consulting PATH. For example, lookPath would be able to find bash and patchelf in the following derivation: derivation { inherit (nixpkgs.

(prog string)

//	  builder = devbox;
//	}
func lookPath(prog string) string {
	pkgPath := os.Getenv(prog)
	if pkgPath == "" {
		return prog
	}
	return filepath.Join(pkgPath, "bin", prog)
}

func isExecutable(mode fs.FileMode) bool { return mode&0o111 != 0 }
func isSymlink(mode fs.FileMode) bool    { return mode&fs.ModeSymlink != 0 }