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b453385bd9
This implements the first round of changes, replacing the volume backend with the new implementation, while keeping most of the external interfaces intact. See #8367 Signed-off-by: Andrey Smirnov <andrey.smirnov@siderolabs.com>
77 lines
1.7 KiB
Go
77 lines
1.7 KiB
Go
// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at http://mozilla.org/MPL/2.0/.
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package mount
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import (
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"context"
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"fmt"
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"time"
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"golang.org/x/sys/unix"
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)
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func unmountLoop(ctx context.Context, printer func(string, ...any), target string, flags int, timeout time.Duration, extraMessage string) (bool, error) {
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errCh := make(chan error, 1)
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go func() {
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errCh <- unix.Unmount(target, flags)
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}()
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start := time.Now()
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progressTicker := time.NewTicker(timeout / 5)
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defer progressTicker.Stop()
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unmountLoop:
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for {
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select {
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case <-ctx.Done():
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return true, ctx.Err()
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case err := <-errCh:
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return true, err
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case <-progressTicker.C:
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timeLeft := timeout - time.Since(start)
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if timeLeft <= 0 {
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break unmountLoop
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}
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if printer != nil {
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printer("unmounting %s%s is taking longer than expected, still waiting for %s", target, extraMessage, timeLeft)
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}
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}
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}
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return false, nil
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}
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// SafeUnmount unmounts the target path, first without force, then with force if the first attempt fails.
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//
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// It makes sure that unmounting has a finite operation timeout.
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func SafeUnmount(ctx context.Context, printer func(string, ...any), target string) error {
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const (
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unmountTimeout = 90 * time.Second
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unmountForceTimeout = 10 * time.Second
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)
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ok, err := unmountLoop(ctx, printer, target, 0, unmountTimeout, "")
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if ok {
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return err
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}
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if printer != nil {
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printer("unmounting %s with force", target)
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}
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ok, err = unmountLoop(ctx, printer, target, unix.MNT_FORCE, unmountTimeout, " with force flag")
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if ok {
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return err
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}
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return fmt.Errorf("unmounting %s with force flag timed out", target)
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}
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