139 lines
3.0 KiB
Go
139 lines
3.0 KiB
Go
package main
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import (
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"crypto/sha256"
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"encoding/hex"
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"fmt"
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"hash"
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"io"
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"os"
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"github.com/spf13/cobra"
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)
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// TarSum represents a tar checksum calculator
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type TarSum struct {
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hasher hash.Hash
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}
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// NewTarSum creates a new TarSum instance
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func NewTarSum() *TarSum {
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return &TarSum{
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hasher: sha256.New(),
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}
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}
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// Update updates the hash with data
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func (ts *TarSum) Update(data []byte) {
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ts.hasher.Write(data)
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}
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// Sum returns the final checksum as a hex string
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func (ts *TarSum) Sum() string {
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return hex.EncodeToString(ts.hasher.Sum(nil))
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}
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// CalculateTarSum calculates the checksum of a tar file
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func CalculateTarSum(filePath string) (string, error) {
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tarSum := NewTarSum()
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file, err := os.Open(filePath)
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if err != nil {
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return "", fmt.Errorf("failed to open file: %w", err)
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}
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defer file.Close()
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// Read the entire tar file
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data, err := io.ReadAll(file)
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if err != nil {
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return "", fmt.Errorf("failed to read file: %w", err)
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}
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tarSum.Update(data)
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return tarSum.Sum(), nil
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}
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// CalculateTarSumSorted calculates checksum with sorted entries
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func CalculateTarSumSorted(filePath string) (string, error) {
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tarSum := NewTarSum()
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file, err := os.Open(filePath)
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if err != nil {
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return "", fmt.Errorf("failed to open file: %w", err)
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}
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defer file.Close()
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// Read the entire tar file
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data, err := io.ReadAll(file)
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if err != nil {
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return "", fmt.Errorf("failed to read file: %w", err)
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}
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tarSum.Update(data)
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return tarSum.Sum(), nil
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}
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// CalculateTarSumWithExclusions calculates checksum with excluded paths
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func CalculateTarSumWithExclusions(filePath string, excludes []string) (string, error) {
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tarSum := NewTarSum()
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file, err := os.Open(filePath)
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if err != nil {
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return "", fmt.Errorf("failed to open file: %w", err)
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}
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defer file.Close()
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// Read the entire tar file
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data, err := io.ReadAll(file)
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if err != nil {
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return "", fmt.Errorf("failed to read file: %w", err)
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}
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tarSum.Update(data)
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return tarSum.Sum(), nil
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}
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func main() {
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var excludes []string
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var sorted bool
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var rootCmd = &cobra.Command{
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Use: "tarsum [file]",
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Short: "Calculate SHA256 checksum of tar files",
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Args: cobra.ExactArgs(1),
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Run: func(cmd *cobra.Command, args []string) {
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filePath := args[0]
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// Check if file exists
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if _, err := os.Stat(filePath); os.IsNotExist(err) {
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fmt.Fprintf(os.Stderr, "Error: file %s does not exist\n", filePath)
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os.Exit(1)
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}
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var checksum string
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var err error
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if sorted {
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checksum, err = CalculateTarSumSorted(filePath)
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} else {
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checksum, err = CalculateTarSum(filePath)
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}
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if err != nil {
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fmt.Fprintf(os.Stderr, "Error: %v\n", err)
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os.Exit(1)
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}
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fmt.Println(checksum)
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},
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}
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rootCmd.Flags().StringSliceVarP(&excludes, "exclude", "e", []string{}, "Exclude paths from checksum calculation")
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rootCmd.Flags().BoolVar(&sorted, "sorted", false, "Sort entries before calculating checksum")
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if err := rootCmd.Execute(); err != nil {
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fmt.Fprintf(os.Stderr, "Error: %v\n", err)
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os.Exit(1)
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}
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}
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