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fs.go
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fs.go
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package fs
import (
"fmt"
"io"
"sort"
"strings"
"github.com/opencontainers/go-digest"
)
type FileSystemIterator interface {
Next() (*FileSystemEntry, error)
}
type FileSystemEntry struct {
Name string
Reader io.Reader
}
type FileSystemInfo struct {
Digest string
Files FileSlice
}
func FromIterator(f FileSystemIterator) (*FileSystemInfo, error) {
nd := make([]string, 0)
fs := &FileSystemInfo{
Files: make(FileSlice, 0),
}
for entry, err := f.Next(); err != io.EOF; entry, err = f.Next() {
if err != nil {
return nil, err
}
dgst, err := fromReader(entry.Reader)
if err != nil {
return nil, err
}
nd = append(nd, fmt.Sprintf("%s;%s\n", entry.Name, dgst))
fs.Files = append(fs.Files, File{Name: entry.Name, Digest: dgst})
}
fs.Digest = digestStrings(nd)
return fs, nil
}
func fromReader(r io.Reader) (string, error) {
dgst, err := digest.FromReader(r)
if err != nil {
return "", err
}
return dgst.String(), nil
}
func digestStrings(s []string) string {
sort.Strings(s)
sb := strings.Builder{}
for _, entry := range s {
sb.WriteString(entry)
}
return digest.FromString(sb.String()).String()
}