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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"
var Version = "unknown"
var printVersion = flag.Bool("version", false, "Print version and exit")
func main() {
flag.Parse()
version := fmt.Sprintf("%s %s", progName, Version)
if *printVersion {
fmt.Println(version)
os.Exit(0)
}
archivePath := os.Getenv("ARCHIVE_PATH")
encodedFileName := os.Getenv("ENCODED_FILE_NAME")
if len(os.Args) != 1 || archivePath == "" || encodedFileName == "" {
fmt.Fprintf(os.Stderr, "Usage: %s\n", progName)
fmt.Fprintf(os.Stderr, "Env: ARCHIVE_PATH=https://path.to/archive.zip or /path/to/archive.zip\n")
fmt.Fprintf(os.Stderr, "Env: ENCODED_FILE_NAME=base64-encoded-file-name\n")
os.Exit(1)
}
scrubbedArchivePath := mask.URL(archivePath)
fileName, err := zipartifacts.DecodeFileEntry(encodedFileName)
if err != nil {
fatalError(fmt.Errorf("decode entry %q", encodedFileName), err)
}
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
archive, err := zipartifacts.OpenArchive(ctx, archivePath)
if err != nil {
fatalError(errors.New("open archive"), err)
}
file := findFileInZip(fileName, archive)
if file == nil {
fatalError(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 {
fatalError(fmt.Errorf("open %q in %q", fileName, scrubbedArchivePath), err)
}
defer reader.Close()
if _, err := fmt.Printf("%d\n", file.UncompressedSize64); err != nil {
fatalError(fmt.Errorf("write file size invalid"), err)
}
if _, err := io.Copy(os.Stdout, reader); err != nil {
fatalError(fmt.Errorf("write %q from %q to stdout", fileName, scrubbedArchivePath), err)
}
}
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)
} else {
os.Exit(1)
}
}
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