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package main
import (
"context"
"flag"
"fmt"
"io"
"os"
"gitlab.com/gitlab-org/gitlab/workhorse/cmd/gitlab-zip-metadata/limit"
"gitlab.com/gitlab-org/gitlab/workhorse/internal/config"
"gitlab.com/gitlab-org/gitlab/workhorse/internal/zipartifacts"
)
const progName = "gitlab-zip-metadata"
var Version = "unknown"
var printVersion = flag.Bool("version", false, "Print version and exit")
var zipReaderLimitBytes = flag.Int64("zip-reader-limit", config.DefaultMetadataConfig.ZipReaderLimitBytes, "The optional number of bytes to limit the zip reader to")
func main() {
flag.Parse()
version := fmt.Sprintf("%s %s", progName, Version)
if *printVersion {
fmt.Println(version)
os.Exit(0)
}
if len(flag.Args()) != 1 {
fmt.Fprintf(os.Stderr, "Usage: %s FILE.ZIP\n", progName)
os.Exit(1)
}
readerFunc := func(reader io.ReaderAt, size int64) io.ReaderAt {
zipReaderLimit := sizeToLimit(size, *zipReaderLimitBytes)
return limit.NewLimitedReaderAt(reader, zipReaderLimit, func(read int64) {
fmt.Fprintf(os.Stderr, "%s: zip archive limit exceeded after reading %d bytes\n", progName, read)
fatalError(zipartifacts.ErrorCode[zipartifacts.CodeLimitsReached])
})
}
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
archive, err := zipartifacts.OpenArchiveWithReaderFunc(ctx, flag.Args()[0], readerFunc)
if err != nil {
fatalError(err)
}
if err := zipartifacts.GenerateZipMetadata(os.Stdout, archive); err != nil {
fatalError(err)
}
}
func fatalError(err error) {
code := zipartifacts.ExitCodeByError(err)
fmt.Fprintf(os.Stderr, "%s error: %v, code: %d\n", progName, err, code)
if code > 0 {
os.Exit(code)
} else {
os.Exit(1)
}
}
// sizeToLimit tries to dermine an appropriate limit in bytes for an archive of
// a given size. If the size is less than 1 gigabyte we always limit a reader
// to 100 megabytes, otherwise the limit is 10% of a given size.
func sizeToLimit(size, defaultSize int64) int64 {
if size <= 1024*config.Megabyte {
return defaultSize
}
return size / 10
}
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