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package main
import (
"archive/zip"
"flag"
"fmt"
"io"
"os"
"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)
}
if len(os.Args) != 3 {
fmt.Fprintf(os.Stderr, "Usage: %s FILE.ZIP ENTRY\n", progName)
os.Exit(1)
}
archiveFileName := os.Args[1]
fileName, err := zipartifacts.DecodeFileEntry(os.Args[2])
if err != nil {
fatalError(fmt.Errorf("decode entry %q: %v", os.Args[2], err))
}
archive, err := zip.OpenReader(archiveFileName)
if err != nil {
notFoundError(fmt.Errorf("open %q: %v", archiveFileName, err))
}
defer archive.Close()
file := findFileInZip(fileName, &archive.Reader)
if file == nil {
notFoundError(fmt.Errorf("find %q in %q: not found", fileName, archiveFileName))
}
// Start decompressing the file
reader, err := file.Open()
if err != nil {
fatalError(fmt.Errorf("open %q in %q: %v", fileName, archiveFileName, err))
}
defer reader.Close()
if _, err := fmt.Printf("%d\n", file.UncompressedSize64); err != nil {
fatalError(fmt.Errorf("write file size: %v", err))
}
if _, err := io.Copy(os.Stdout, reader); err != nil {
fatalError(fmt.Errorf("write %q from %q to stdout: %v", fileName, archiveFileName, err))
}
}
func findFileInZip(fileName string, archive *zip.Reader) *zip.File {
for _, file := range archive.File {
if file.Name == fileName {
return file
}
}
return nil
}
func printError(err error) {
fmt.Fprintf(os.Stderr, "%s: %v", progName, err)
}
func fatalError(err error) {
printError(err)
os.Exit(1)
}
func notFoundError(err error) {
printError(err)
os.Exit(zipartifacts.StatusEntryNotFound)
}
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