48a09f34bd
Without this line of code, if a volume is present in /proc/mounts, it cannot be remounted with new mount options. Docker-DCO-1.1-Signed-off-by: Peter Waller <p@pwaller.net> (github: pwaller)
70 lines
1.6 KiB
Go
70 lines
1.6 KiB
Go
package mount
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import (
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"time"
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)
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func GetMounts() ([]*MountInfo, error) {
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return parseMountTable()
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}
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// Looks at /proc/self/mountinfo to determine of the specified
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// mountpoint has been mounted
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func Mounted(mountpoint string) (bool, error) {
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entries, err := parseMountTable()
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if err != nil {
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return false, err
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}
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// Search the table for the mountpoint
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for _, e := range entries {
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if e.Mountpoint == mountpoint {
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return true, nil
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}
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}
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return false, nil
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}
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// Mount the specified options at the target path only if
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// the target is not mounted
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// Options must be specified as fstab style
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func Mount(device, target, mType, options string) error {
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flag, _ := parseOptions(options)
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if flag&REMOUNT != REMOUNT {
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if mounted, err := Mounted(target); err != nil || mounted {
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return err
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}
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}
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return ForceMount(device, target, mType, options)
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}
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// Mount the specified options at the target path
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// reguardless if the target is mounted or not
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// Options must be specified as fstab style
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func ForceMount(device, target, mType, options string) error {
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flag, data := parseOptions(options)
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if err := mount(device, target, mType, uintptr(flag), data); err != nil {
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return err
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}
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return nil
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}
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// Unmount the target only if it is mounted
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func Unmount(target string) error {
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if mounted, err := Mounted(target); err != nil || !mounted {
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return err
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}
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return ForceUnmount(target)
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}
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// Unmount the target reguardless if it is mounted or not
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func ForceUnmount(target string) (err error) {
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// Simple retry logic for unmount
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for i := 0; i < 10; i++ {
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if err = unmount(target, 0); err == nil {
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return nil
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}
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time.Sleep(100 * time.Millisecond)
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}
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return
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}
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