9b725c15cf
...and convert all calls to syscall.{Fallocate,Openat}
to syscallcompat .
Both syscalls are not available on OSX. We emulate Openat and just
return EOPNOTSUPP for Fallocate.
46 lines
1004 B
Go
46 lines
1004 B
Go
package syscallcompat
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import (
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"os"
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"sync"
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"syscall"
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)
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// prealloc - preallocate space without changing the file size. This prevents
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// us from running out of space in the middle of an operation.
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func Prealloc(fd int, off int64, len int64) (err error) {
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//
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// Sorry, fallocate is not available on OSX at all and
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// fcntl F_PREALLOCATE is not accessible from Go.
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//
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// See https://github.com/rfjakob/gocryptfs/issues/18 if you want to help.
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return nil
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}
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var openatLock sync.Mutex
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// Poor man's Openat:
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// 1) fchdir to the dirfd
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// 2) open the file
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// 3) chdir back.
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func Openat(dirfd int, path string, flags int, mode uint32) (fd int, err error) {
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openatLock.Lock()
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defer openatLock.Unlock()
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oldWd, err := os.Getwd()
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if err != nil {
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return -1, err
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}
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err = syscall.Fchdir(dirfd)
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if err != nil {
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return -1, err
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}
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defer os.Chdir(oldWd)
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return syscall.Open(path, flags, mode)
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}
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func Fallocate(fd int, mode uint32, off int64, len int64) (err error) {
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return syscall.EOPNOTSUPP
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}
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