97 lines
2.4 KiB
Go
97 lines
2.4 KiB
Go
package main
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import (
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"context"
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"errors"
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"flag"
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"fmt"
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"io"
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"os"
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zip "gitlab.com/gitlab-org/golang-archive-zip"
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"gitlab.com/gitlab-org/labkit/mask"
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"gitlab.com/gitlab-org/gitlab/workhorse/internal/zipartifacts"
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)
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const progName = "gitlab-zip-cat"
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var Version = "unknown"
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var printVersion = flag.Bool("version", false, "Print version and exit")
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func main() {
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flag.Parse()
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version := fmt.Sprintf("%s %s", progName, Version)
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if *printVersion {
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fmt.Println(version)
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os.Exit(0)
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}
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archivePath := os.Getenv("ARCHIVE_PATH")
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encodedFileName := os.Getenv("ENCODED_FILE_NAME")
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if len(os.Args) != 1 || archivePath == "" || encodedFileName == "" {
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fmt.Fprintf(os.Stderr, "Usage: %s\n", progName)
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fmt.Fprintf(os.Stderr, "Env: ARCHIVE_PATH=https://path.to/archive.zip or /path/to/archive.zip\n")
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fmt.Fprintf(os.Stderr, "Env: ENCODED_FILE_NAME=base64-encoded-file-name\n")
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os.Exit(1)
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}
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scrubbedArchivePath := mask.URL(archivePath)
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fileName, err := zipartifacts.DecodeFileEntry(encodedFileName)
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if err != nil {
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fatalError(fmt.Errorf("decode entry %q", encodedFileName), err)
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}
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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archive, err := zipartifacts.OpenArchive(ctx, archivePath)
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if err != nil {
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fatalError(errors.New("open archive"), err)
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}
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file := findFileInZip(fileName, archive)
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if file == nil {
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fatalError(fmt.Errorf("find %q in %q: not found", fileName, scrubbedArchivePath), zipartifacts.ErrorCode[zipartifacts.CodeEntryNotFound])
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}
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// Start decompressing the file
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reader, err := file.Open()
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if err != nil {
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fatalError(fmt.Errorf("open %q in %q", fileName, scrubbedArchivePath), err)
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}
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defer reader.Close()
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if _, err := fmt.Printf("%d\n", file.UncompressedSize64); err != nil {
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fatalError(fmt.Errorf("write file size invalid"), err)
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}
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if _, err := io.Copy(os.Stdout, reader); err != nil {
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fatalError(fmt.Errorf("write %q from %q to stdout", fileName, scrubbedArchivePath), err)
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}
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}
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func findFileInZip(fileName string, archive *zip.Reader) *zip.File {
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for _, file := range archive.File {
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if file.Name == fileName {
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return file
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}
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}
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return nil
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}
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func fatalError(contextErr error, statusErr error) {
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code := zipartifacts.ExitCodeByError(statusErr)
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fmt.Fprintf(os.Stderr, "%s error: %v - %v, code: %d\n", progName, statusErr, contextErr, code)
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if code > 0 {
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os.Exit(code)
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} else {
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os.Exit(1)
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}
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}
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