/
checksum.go
63 lines (50 loc) · 1.04 KB
/
checksum.go
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package updater
import (
"crypto/sha256"
"encoding/hex"
"fmt"
"io"
"os"
"path/filepath"
"strings"
)
func checksum(binPath, checksumsPath string) error {
hasher := sha256.New()
checksum, err := getChecksum(binPath, checksumsPath)
if err != nil {
return err
}
binFile, err := os.Open(binPath)
if err != nil {
return err
}
if _, err = io.Copy(hasher, binFile); err != nil {
return err
}
otherChecksum := hex.EncodeToString(hasher.Sum(nil))
if checksum != otherChecksum {
return fmt.Errorf("checksum failed")
}
return nil
}
func getChecksum(binPath, checksumsPath string) (string, error) {
file, err := os.Open(checksumsPath)
if err != nil {
return "", err
}
bytes, err := (io.ReadAll(file))
if err != nil {
return "", err
}
lines := strings.Split(string(bytes), "\n")
var checksum string
for _, line := range lines {
binName := filepath.Base(binPath)
if strings.HasSuffix(line, fmt.Sprintf(" %s", binName)) {
columns := strings.Split(line, " ")
checksum = columns[0]
break
}
}
return checksum, nil
}