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// +build linux darwin freebsd solaris
package directory
import (
"os"
"path/filepath"
"syscall"
)
// Size walks a directory tree and returns its total size in bytes.
func Size(dir string) (size int64, err error) {
data := make(map[uint64]struct{})
err = filepath.Walk(dir, func(d string, fileInfo os.FileInfo, err error) error {
if err != nil {
// if dir does not exist, Size() returns the error.
// if dir/x disappeared while walking, Size() ignores dir/x.
if os.IsNotExist(err) && d != dir {
return nil
}
return err
}
// Ignore directory sizes
if fileInfo == nil {
return nil
}
s := fileInfo.Size()
if fileInfo.IsDir() || s == 0 {
return nil
}
// Check inode to handle hard links correctly
inode := fileInfo.Sys().(*syscall.Stat_t).Ino
// inode is not a uint64 on all platforms. Cast it to avoid issues.
if _, exists := data[uint64(inode)]; exists {
return nil
}
// inode is not a uint64 on all platforms. Cast it to avoid issues.
data[uint64(inode)] = struct{}{}
size += s
return nil
})
return
}
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