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118 lines
3.0 KiB
118 lines
3.0 KiB
package dataverify
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import (
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"bufio"
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"crypto/sha256"
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"encoding/hex"
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"fmt"
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"io"
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"os"
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"path/filepath"
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"strings"
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"github.com/sirupsen/logrus"
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)
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// Verify will check the sha256sums and links from the files in a given directory
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func Verify(dir string) error {
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failed := false
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if err := VerifySums(dir, ".sha256sums"); err != nil {
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logrus.Errorf("Unable to verify sums: %s", err)
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failed = true
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}
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if err := VerifyLinks(dir, ".links"); err != nil {
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logrus.Errorf("Unable to verify links: %s", err)
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failed = true
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}
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if failed {
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return fmt.Errorf("failed to verify directory %s", dir)
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}
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return nil
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}
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// VerifySums will take a file which contains a list of hash sums for files and verify they match
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func VerifySums(root, sumListFile string) error {
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sums, err := fileMapFields(filepath.Join(root, sumListFile), 1, 0)
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if err != nil {
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return err
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}
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if len(sums) == 0 {
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return fmt.Errorf("no entries found in %s", sumListFile)
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}
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numFailed := 0
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for sumFile, sumExpected := range sums {
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file := filepath.Join(root, sumFile)
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sumActual, _ := sha256Sum(file)
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if sumExpected != sumActual {
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logrus.Errorf("Hash for file %s expected to be %s (fail)", sumFile, sumExpected)
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numFailed++
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} else {
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logrus.Debugf("Verified hash %s is correct", sumFile)
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}
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}
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if numFailed != 0 {
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return fmt.Errorf("failed %d hash verifications", numFailed)
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}
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return nil
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}
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// VerifyLinks will take a file which contains a list of target links for files and verify they match
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func VerifyLinks(root, linkListFile string) error {
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links, err := fileMapFields(filepath.Join(root, linkListFile), 0, 1)
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if err != nil {
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return err
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}
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if len(links) == 0 {
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return fmt.Errorf("no entries found in %s", linkListFile)
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}
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numFailed := 0
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for linkFile, linkExpected := range links {
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file := filepath.Join(root, linkFile)
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linkActual, _ := os.Readlink(file)
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if linkExpected != linkActual {
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logrus.Errorf("Link for file %s expected to be %s (fail)", linkFile, linkExpected)
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numFailed++
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} else {
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logrus.Debugf("Verified link %s is correct", linkFile)
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}
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}
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if numFailed != 0 {
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return fmt.Errorf("failed %d link verifications", numFailed)
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}
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return nil
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}
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func fileMapFields(fileName string, key, val int) (map[string]string, error) {
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file, err := os.Open(fileName)
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if err != nil {
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return nil, err
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}
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defer file.Close()
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result := map[string]string{}
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scanner := bufio.NewScanner(file)
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for scanner.Scan() {
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fields := strings.Fields(scanner.Text())
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if len(fields) == 0 {
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continue
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}
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if len(fields) <= key || len(fields) <= val {
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return nil, fmt.Errorf("fields for file %s (%d) smaller than required index (key: %d, val: %d)", fileName, len(fields), key, val)
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}
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result[fields[key]] = fields[val]
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}
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return result, scanner.Err()
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}
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func sha256Sum(filePath string) (string, error) {
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file, err := os.Open(filePath)
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if err != nil {
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return "", err
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}
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defer file.Close()
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hash := sha256.New()
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if _, err := io.Copy(hash, file); err != nil {
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return "", err
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}
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return hex.EncodeToString(hash.Sum(nil)), nil
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}
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