99 lines
2.1 KiB
Go
99 lines
2.1 KiB
Go
package contenthash
|
|
|
|
import (
|
|
"archive/tar"
|
|
"crypto/sha256"
|
|
"hash"
|
|
"os"
|
|
"path/filepath"
|
|
"time"
|
|
|
|
fstypes "github.com/tonistiigi/fsutil/types"
|
|
)
|
|
|
|
// NewFileHash returns new hash that is used for the builder cache keys
|
|
func NewFileHash(path string, fi os.FileInfo) (hash.Hash, error) {
|
|
var link string
|
|
if fi.Mode()&os.ModeSymlink != 0 {
|
|
var err error
|
|
link, err = os.Readlink(path)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
stat := &fstypes.Stat{
|
|
Mode: uint32(fi.Mode()),
|
|
Size_: fi.Size(),
|
|
ModTime: fi.ModTime().UnixNano(),
|
|
Linkname: link,
|
|
}
|
|
|
|
if fi.Mode()&os.ModeSymlink != 0 {
|
|
stat.Mode = stat.Mode | 0777
|
|
}
|
|
|
|
if err := setUnixOpt(path, fi, stat); err != nil {
|
|
return nil, err
|
|
}
|
|
return NewFromStat(stat)
|
|
}
|
|
|
|
func NewFromStat(stat *fstypes.Stat) (hash.Hash, error) {
|
|
fi := &statInfo{stat}
|
|
hdr, err := tar.FileInfoHeader(fi, stat.Linkname)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
hdr.Name = "" // note: empty name is different from current has in docker build. Name is added on recursive directory scan instead
|
|
hdr.Mode = int64(chmodWindowsTarEntry(os.FileMode(hdr.Mode)))
|
|
hdr.Devmajor = stat.Devmajor
|
|
hdr.Devminor = stat.Devminor
|
|
|
|
if len(stat.Xattrs) > 0 {
|
|
hdr.Xattrs = make(map[string]string, len(stat.Xattrs))
|
|
for k, v := range stat.Xattrs {
|
|
hdr.Xattrs[k] = string(v)
|
|
}
|
|
}
|
|
// fmt.Printf("hdr: %#v\n", hdr)
|
|
tsh := &tarsumHash{hdr: hdr, Hash: sha256.New()}
|
|
tsh.Reset() // initialize header
|
|
return tsh, nil
|
|
}
|
|
|
|
type tarsumHash struct {
|
|
hash.Hash
|
|
hdr *tar.Header
|
|
}
|
|
|
|
// Reset resets the Hash to its initial state.
|
|
func (tsh *tarsumHash) Reset() {
|
|
// comply with hash.Hash and reset to the state hash had before any writes
|
|
tsh.Hash.Reset()
|
|
WriteV1TarsumHeaders(tsh.hdr, tsh.Hash)
|
|
}
|
|
|
|
type statInfo struct {
|
|
*fstypes.Stat
|
|
}
|
|
|
|
func (s *statInfo) Name() string {
|
|
return filepath.Base(s.Stat.Path)
|
|
}
|
|
func (s *statInfo) Size() int64 {
|
|
return s.Stat.Size_
|
|
}
|
|
func (s *statInfo) Mode() os.FileMode {
|
|
return os.FileMode(s.Stat.Mode)
|
|
}
|
|
func (s *statInfo) ModTime() time.Time {
|
|
return time.Unix(s.Stat.ModTime/1e9, s.Stat.ModTime%1e9)
|
|
}
|
|
func (s *statInfo) IsDir() bool {
|
|
return s.Mode().IsDir()
|
|
}
|
|
func (s *statInfo) Sys() interface{} {
|
|
return s.Stat
|
|
}
|