| 1 | // package mount provides a simple abstraction around a mount point |
| 2 | package mount |
| 3 | |
| 4 | import ( |
| 5 | "fmt" |
| 6 | "io" |
| 7 | "os/exec" |
| 8 | "runtime" |
| 9 | "time" |
| 10 | |
| 11 | logging "github.com/ipfs/go-log/v2" |
| 12 | ) |
| 13 | |
| 14 | var log = logging.Logger("mount") |
| 15 | |
| 16 | var MountTimeout = time.Second * 5 |
| 17 | |
| 18 | // Mount represents a filesystem mount. |
| 19 | type Mount interface { |
| 20 | // MountPoint is the path at which this mount is mounted |
| 21 | MountPoint() string |
| 22 | |
| 23 | // Unmounts the mount |
| 24 | Unmount() error |
| 25 | |
| 26 | // Checks if the mount is still active. |
| 27 | IsActive() bool |
| 28 | } |
| 29 | |
| 30 | // ForceUnmount attempts to forcibly unmount a given mount. |
| 31 | // It does so by calling diskutil or fusermount directly. |
| 32 | func ForceUnmount(m Mount) error { |
| 33 | point := m.MountPoint() |
| 34 | log.Warnf("Force-Unmounting %s...", point) |
| 35 | |
| 36 | cmd, err := UnmountCmd(point) |
| 37 | if err != nil { |
| 38 | return err |
| 39 | } |
| 40 | |
| 41 | errc := make(chan error, 1) |
| 42 | go func() { |
| 43 | defer close(errc) |
| 44 | |
| 45 | // try vanilla unmount first. |
| 46 | if err := exec.Command("umount", point).Run(); err == nil { |
| 47 | return |
| 48 | } |
| 49 | |
| 50 | // retry to unmount with the fallback cmd |
| 51 | errc <- cmd.Run() |
| 52 | }() |
| 53 | |
| 54 | select { |
| 55 | case <-time.After(7 * time.Second): |
| 56 | return fmt.Errorf("umount timeout") |
| 57 | case err := <-errc: |
| 58 | return err |
| 59 | } |
| 60 | } |
| 61 | |
| 62 | // UnmountCmd creates an exec.Cmd that is GOOS-specific |
| 63 | // for unmount a FUSE mount. |
| 64 | func UnmountCmd(point string) (*exec.Cmd, error) { |
| 65 | switch runtime.GOOS { |
| 66 | case "darwin": |
| 67 | return exec.Command("diskutil", "umount", "force", point), nil |
| 68 | case "linux": |
| 69 | if _, err := exec.LookPath("fusermount3"); err == nil { |
| 70 | return exec.Command("fusermount3", "-u", point), nil |
| 71 | } |
| 72 | return exec.Command("fusermount", "-u", point), nil |
| 73 | default: |
| 74 | return nil, fmt.Errorf("unmount: unimplemented") |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | // ForceUnmountManyTimes attempts to forcibly unmount a given mount, |
| 79 | // many times. It does so by calling diskutil or fusermount directly. |
| 80 | // Attempts a given number of times. |
| 81 | func ForceUnmountManyTimes(m Mount, attempts int) error { |
| 82 | var err error |
| 83 | for range attempts { |
| 84 | err = ForceUnmount(m) |
| 85 | if err == nil { |
| 86 | return err |
| 87 | } |
| 88 | |
| 89 | <-time.After(time.Millisecond * 500) |
| 90 | } |
| 91 | return fmt.Errorf("unmount %s failed after 10 seconds of trying", m.MountPoint()) |
| 92 | } |
| 93 | |
| 94 | type closer struct { |
| 95 | M Mount |
| 96 | } |
| 97 | |
| 98 | func (c *closer) Close() error { |
| 99 | log.Warn(" (c *closer) Close(),", c.M.MountPoint()) |
| 100 | return c.M.Unmount() |
| 101 | } |
| 102 | |
| 103 | func Closer(m Mount) io.Closer { |
| 104 | return &closer{m} |
| 105 | } |