terraform/internal/states/statemgr/filesystem_lock_unix.go

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// +build !windows
package statemgr
import (
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"io"
"log"
"syscall"
)
// use fcntl POSIX locks for the most consistent behavior across platforms, and
// hopefully some campatibility over NFS and CIFS.
func (s *Filesystem) lock() error {
log.Printf("[TRACE] statemgr.Filesystem: locking %s using fcntl flock", s.path)
flock := &syscall.Flock_t{
Type: syscall.F_RDLCK | syscall.F_WRLCK,
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Whence: int16(io.SeekStart),
Start: 0,
Len: 0,
}
fd := s.stateFileOut.Fd()
return syscall.FcntlFlock(fd, syscall.F_SETLK, flock)
}
func (s *Filesystem) unlock() error {
log.Printf("[TRACE] statemgr.Filesystem: unlocking %s using fcntl flock", s.path)
flock := &syscall.Flock_t{
Type: syscall.F_UNLCK,
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Whence: int16(io.SeekStart),
Start: 0,
Len: 0,
}
fd := s.stateFileOut.Fd()
return syscall.FcntlFlock(fd, syscall.F_SETLK, flock)
}