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31 lines
694 B
Go
31 lines
694 B
Go
//go:build !windows
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// +build !windows
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package fs
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import (
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"os"
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"syscall"
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"github.com/restic/restic/internal/errors"
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)
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// DeviceID extracts the device ID from an os.FileInfo object by casting it
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// to syscall.Stat_t
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func DeviceID(fi os.FileInfo) (deviceID uint64, err error) {
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if fi == nil {
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return 0, errors.New("unable to determine device: fi is nil")
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}
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if fi.Sys() == nil {
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return 0, errors.New("unable to determine device: fi.Sys() is nil")
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}
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if st, ok := fi.Sys().(*syscall.Stat_t); ok {
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// st.Dev is uint32 on Darwin and uint64 on Linux. Just cast
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// everything to uint64.
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return uint64(st.Dev), nil
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}
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return 0, errors.New("Could not cast to syscall.Stat_t")
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}
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