mirror of https://git.jolheiser.com/git-age
116 lines
2.2 KiB
Go
116 lines
2.2 KiB
Go
package cmd
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import (
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"bytes"
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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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"filippo.io/age"
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"github.com/urfave/cli/v2"
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"lukechampine.com/blake3"
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)
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var Clean = &cli.Command{
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Name: "clean",
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Aliases: []string{"c"},
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Description: "Git clean filter",
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Hidden: true,
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Flags: []cli.Flag{
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&cli.StringFlag{
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Name: "file",
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Usage: "File being worked on",
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Aliases: []string{"f"},
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},
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},
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Action: actionClean,
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}
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func actionClean(ctx *cli.Context) error {
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recipients, err := ageRecipients(ctx.String("file"))
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if err != nil {
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return err
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}
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dir, err := gitConfigDir(ctx.String("file"))
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if err != nil {
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return err
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}
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existing, err := os.ReadFile(filepath.Join(dir, "blake3"))
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if err != nil {
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// File doesn't exist
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}
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var stdin bytes.Buffer
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hasher := blake3.New(64, nil)
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hasherTee := io.TeeReader(os.Stdin, hasher)
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if _, err := io.Copy(&stdin, hasherTee); err != nil {
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return err
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}
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sum := hasher.Sum(nil)
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if fmt.Sprintf("%x", existing) == fmt.Sprintf("%x", sum) {
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saved, err := os.ReadFile(filepath.Join(dir, "age"))
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if err != nil {
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return err
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}
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os.Stdout.Write(saved)
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return nil
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}
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hashFile, err := os.Create(filepath.Join(dir, "blake3"))
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if err != nil {
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return err
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}
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hashFile.Write(sum)
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defer hashFile.Close()
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ageFile, err := os.Create(filepath.Join(dir, "age"))
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if err != nil {
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return err
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}
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defer ageFile.Close()
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headDecrypted, headEncrypted, err := headContents(ctx.String("file"))
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if err != nil {
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return err
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}
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if string(headDecrypted) == stdin.String() {
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ageFile.Write(headEncrypted)
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os.Stdout.Write(headEncrypted)
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return nil
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}
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mw := io.MultiWriter(ageFile, os.Stdout)
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wc, err := age.Encrypt(mw, recipients...)
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if err != nil {
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return err
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}
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if _, err := io.Copy(wc, &stdin); err != nil {
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return err
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}
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return wc.Close()
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}
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func headContents(file string) ([]byte, []byte, error) {
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out, err := cmd("git", "cat-file", "blob", fmt.Sprintf("HEAD:%s", file))
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if err != nil {
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return nil, nil, nil
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}
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identities, err := ageIdentities()
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if err != nil {
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return nil, nil, err
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}
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r, err := age.Decrypt(strings.NewReader(out), identities...)
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if err != nil {
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return nil, nil, err
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}
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decrypted, err := io.ReadAll(r)
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return decrypted, []byte(out), err
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}
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