| 1 | //go:build !windows |
| 2 | |
| 3 | package workspacelease |
| 4 | |
| 5 | import ( |
| 6 | "errors" |
| 7 | "os" |
| 8 | |
| 9 | "golang.org/x/sys/unix" |
| 10 | ) |
| 11 | |
| 12 | func tryLockFile(path string) (func(), error) { |
| 13 | f, err := os.OpenFile(path, os.O_CREATE|os.O_RDWR, 0o600) |
| 14 | if err != nil { |
| 15 | return nil, err |
| 16 | } |
| 17 | if err := unix.Flock(int(f.Fd()), unix.LOCK_EX|unix.LOCK_NB); err != nil { |
| 18 | _ = f.Close() |
| 19 | if errors.Is(err, unix.EWOULDBLOCK) || errors.Is(err, unix.EAGAIN) { |
| 20 | return nil, errHeld |
| 21 | } |
| 22 | return nil, err |
| 23 | } |
| 24 | return func() { |
| 25 | _ = unix.Flock(int(f.Fd()), unix.LOCK_UN) |
| 26 | _ = f.Close() |
| 27 | }, nil |
| 28 | } |
| 29 |