Andy Dixon
5aa60d7bc7
Commands that change the vault hold an exclusive lock on DIR/.lock and readers hold a shared one, taken after the passphrase prompt. A blocked process says it is waiting. Unix uses fcntl locks and Windows uses LockFileEx, both released by the OS if the process dies. Plan 9 and WebAssembly fall back to an exclusive lock file. build.sh cross-compiles static binaries for every Go target that builds without cgo (43 today, armv6 and armv7 for 32-bit ARM Linux) and writes SHA256SUMS.
38 lines
900 B
Go
38 lines
900 B
Go
// Copyright 2026 The vault Authors.
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// SPDX-License-Identifier: GPL-3.0-or-later
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//go:build !unix && !windows
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package main
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import (
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"errors"
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"fmt"
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"io/fs"
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"os"
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"time"
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)
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// acquireLock falls back to an exclusive lock file where the OS offers no
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// file locks. Every lock is exclusive here.
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// ponytail: a crash leaves the lock file behind; the error names it for manual removal.
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func acquireLock(path string, _ bool, waiting func()) (func(), error) {
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for i := 0; ; i++ {
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f, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_EXCL, 0o600)
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if err == nil {
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f.Close()
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return func() { os.Remove(path) }, nil
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}
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if !errors.Is(err, fs.ErrExist) {
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return nil, err
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}
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if i == 0 {
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waiting()
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}
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if i == 600 {
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return nil, fmt.Errorf("vault still locked after a minute; if no other vault process is running, remove %s", path)
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}
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time.Sleep(100 * time.Millisecond)
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}
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}
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