30 lines
654 B
Go
30 lines
654 B
Go
package fsutil
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import (
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"os"
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"syscall"
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"golang.org/x/xerrors"
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)
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type SizeInfo struct {
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OnDisk int64
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}
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// FileSize returns bytes used by a file on disk
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func FileSize(path string) (SizeInfo, error) {
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var stat syscall.Stat_t
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if err := syscall.Stat(path, &stat); err != nil {
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if err == syscall.ENOENT {
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return SizeInfo{}, os.ErrNotExist
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}
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return SizeInfo{}, xerrors.Errorf("stat: %w", err)
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}
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// NOTE: stat.Blocks is in 512B blocks, NOT in stat.Blksize
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// See https://www.gnu.org/software/libc/manual/html_node/Attribute-Meanings.html
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return SizeInfo{
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int64(stat.Blocks) * 512, // nolint NOTE: int64 cast is needed on osx
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}, nil
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}
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