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moby--moby/pkg/system/stat_linux.go
Burke Libbey 45c45a2c9a
archive: Optimize ChangesDirs on Linux
If we tear through a few layers of abstraction, we can get at the inodes
contained in a directory without having to stat all the files. This
allows us to eliminate identical files much earlier in the changelist
generation process.

Signed-off-by: Burke Libbey <burke@libbey.me>
2015-04-27 21:26:13 -04:00

33 lines
737 B
Go

package system
import (
"syscall"
)
// fromStatT converts a syscall.Stat_t type to a system.Stat_t type
func fromStatT(s *syscall.Stat_t) (*Stat_t, error) {
return &Stat_t{size: s.Size,
mode: s.Mode,
uid: s.Uid,
gid: s.Gid,
rdev: s.Rdev,
mtim: s.Mtim}, nil
}
// FromStatT exists only on linux, and loads a system.Stat_t from a
// syscal.Stat_t.
func FromStatT(s *syscall.Stat_t) (*Stat_t, error) {
return fromStatT(s)
}
// Stat takes a path to a file and returns
// a system.Stat_t type pertaining to that file.
//
// Throws an error if the file does not exist
func Stat(path string) (*Stat_t, error) {
s := &syscall.Stat_t{}
if err := syscall.Stat(path, s); err != nil {
return nil, err
}
return fromStatT(s)
}