Flechazo
113e941bef
- add character imprint, awakening, and equipment refinement - add equipment ticket gacha and persistent progression fields - add request-scoped account transactions with crash recovery - persist age confirmation and isolate client plugin patches - separate one-off save repair tools from shipped tooling
41 lines
991 B
Go
41 lines
991 B
Go
//go:build linux
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package statetx
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import (
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"os"
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"golang.org/x/sys/unix"
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)
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// Linux first asks the filesystem for an FICLONE copy-on-write snapshot
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// (btrfs, XFS and supporting filesystems). Byte copying remains the safe
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// fallback; hard links are deliberately avoided because in-place writes by a
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// future Store implementation would also mutate the undo image.
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func snapshotBefore(source, destination string) error {
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if err := reflinkLinux(source, destination); err == nil {
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return nil
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}
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_ = os.Remove(destination)
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return copySynced(source, destination)
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}
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func reflinkLinux(source, destination string) error {
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src, err := os.Open(source)
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if err != nil {
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return err
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}
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defer src.Close()
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dst, err := os.OpenFile(destination, os.O_CREATE|os.O_EXCL|os.O_WRONLY, 0o600)
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if err != nil {
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return err
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}
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if err = unix.IoctlFileClone(int(dst.Fd()), int(src.Fd())); err == nil {
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err = dst.Sync()
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}
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if closeErr := dst.Close(); err == nil {
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err = closeErr
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}
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return err
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}
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