/
dirhash.go
55 lines (50 loc) · 1.19 KB
/
dirhash.go
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package packer
import (
"encoding/base64"
"errors"
"fmt"
"hash/fnv"
"io"
"os"
"sort"
"strings"
"golang.org/x/mod/zip"
)
func quickHash(files []string, open func(string) (io.ReadCloser, error)) (string, error) {
h := fnv.New128()
files = append([]string(nil), files...)
sort.Strings(files)
for _, file := range files {
if strings.Contains(file, "\n") {
return "", errors.New("dirhash: filenames with newlines are not supported")
}
r, err := open(file)
if err != nil {
return "", err
}
hf := fnv.New128()
_, err = io.Copy(hf, r)
r.Close()
if err != nil {
return "", err
}
fmt.Fprintf(h, "%x %s\n", hf.Sum(nil), file)
}
return "qh:" + base64.StdEncoding.EncodeToString(h.Sum(nil)), nil
}
// hashDir is like dirhash.HashDir, but it filters hidden files and uses
// quickHash.
func hashDir(dir string) (string, error) {
checked, _ := zip.CheckDir(dir)
checked.SizeError = nil // ignore maximum module size of 500 MB
if err := checked.Err(); err != nil {
return "", fmt.Errorf("CheckDir(%s): %v", dir, err)
}
h, err := quickHash(checked.Valid, func(name string) (io.ReadCloser, error) {
return os.Open(name)
})
if err != nil {
return "", err
}
return h, nil
}