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// Package main provides a utility for extracting and displaying files from a ZIP archive.
package main
import (
"archive/zip"
"context"
"errors"
"flag"
"fmt"
"io"
"os"
"gitlab.com/gitlab-org/labkit/mask"
"gitlab.com/gitlab-org/gitlab/workhorse/internal/zipartifacts"
)
const progName = "gitlab-zip-cat"
// Version holds the version of the program, which is set during the build process.
var Version = "unknown"
var printVersion = flag.Bool("version", false, "Print version and exit")
func main() {
flag.Parse()
if *printVersion {
fmt.Printf("%s %s\n", progName, Version)
os.Exit(0)
}
contextErr, statusErr := run()
if contextErr != nil && statusErr == nil {
fmt.Fprintln(os.Stderr, statusErr)
os.Exit(1)
}
if contextErr != nil && statusErr != nil {
fatalError(contextErr, statusErr)
}
}
func run() (error, error) {
archivePath := os.Getenv("ARCHIVE_PATH")
encodedFileName := os.Getenv("ENCODED_FILE_NAME")
if len(os.Args) != 1 || archivePath == "" || encodedFileName == "" {
return fmt.Errorf("usage: %s\nEnv: ARCHIVE_PATH=https://path.to/archive.zip or /path/to/archive.zip\nEnv: ENCODED_FILE_NAME=base64-encoded-file-name", progName), nil
}
scrubbedArchivePath := mask.URL(archivePath)
fileName, err := zipartifacts.DecodeFileEntry(encodedFileName)
if err != nil {
return fmt.Errorf("decode entry %q", encodedFileName), err
}
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
archive, err := zipartifacts.OpenArchive(ctx, archivePath)
if err != nil {
return errors.New("open archive"), err
}
file := findFileInZip(fileName, archive)
if file == nil {
return fmt.Errorf("find %q in %q: not found", fileName, scrubbedArchivePath), zipartifacts.ErrorCode[zipartifacts.CodeEntryNotFound]
}
// Start decompressing the file
reader, err := file.Open()
if err != nil {
return fmt.Errorf("open %q in %q", fileName, scrubbedArchivePath), err
}
defer reader.Close() //nolint:errcheck
if _, err := fmt.Printf("%d\n", file.UncompressedSize64); err != nil {
return fmt.Errorf("write file size invalid"), err
}
if _, err := io.Copy(os.Stdout, reader); err != nil {
return fmt.Errorf("write %q from %q to stdout", fileName, scrubbedArchivePath), err
}
return nil, nil
}
func findFileInZip(fileName string, archive *zip.Reader) *zip.File {
for _, file := range archive.File {
if file.Name == fileName {
return file
}
}
return nil
}
func fatalError(contextErr error, statusErr error) {
code := zipartifacts.ExitCodeByError(statusErr)
fmt.Fprintf(os.Stderr, "%s error: %v - %v, code: %d\n", progName, statusErr, contextErr, code)
if code > 0 {
os.Exit(code)
}
os.Exit(1)
}
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