cmd/upload: remove special Go1.4 bootstrap support

Go 1.4 is no longer used for bootstrap. (Hooray!)

For golang/go#44505.

Change-Id: Id8ad641fa8ed88a2114879eb35ee45fff135eab6
Reviewed-on: https://go-review.googlesource.com/c/build/+/420215
Reviewed-by: Dmitri Shuralyov <[email protected]>
Run-TryBot: Russ Cox <[email protected]>
Reviewed-by: Dmitri Shuralyov <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>
Auto-Submit: Russ Cox <[email protected]>

cmd/upload/upload.go

@@ -9,7 +9,6 @@
 package main
 
 import (
-	"archive/tar"
 	"bytes"
 	"compress/gzip"
 	"context"
@@ -20,7 +19,6 @@ import (
 	"log"
 	"net/http"
 	"os"
-	"regexp"
 	"strings"
 
 	"cloud.google.com/go/storage"
@@ -36,18 +34,9 @@ var (
 	extraEnv  = flag.String("env", "", "comma-separated list of addition KEY=val environment pairs to include in build environment when building a target to upload")
 )
 
-// to match uploads to e.g. https://storage.googleapis.com/golang/go1.4-bootstrap-20170531.tar.gz.
-var go14BootstrapRx = regexp.MustCompile(`^go1\.4-bootstrap-20\d{6}\.tar\.gz$`)
-
 func main() {
 	flag.Usage = func() {
-		fmt.Fprintf(os.Stderr, `Usage: upload [flags] <bucket/object>
-
-If <bucket/object> is of the form "golang/go1.4-bootstrap-20yymmdd.tar.gz",
-then the current release-branch.go1.4 is uploaded from Gerrit, with each
-tar entry filename beginning with the prefix "go/".
-
-`)
+		fmt.Fprintf(os.Stderr, "Usage: upload [flags] bucket/object\n")
 		flag.PrintDefaults()
 	}
 	flag.Parse()
@@ -65,17 +54,6 @@ tar entry filename beginning with the prefix "go/".
 	}
 	bucket, object := args[0], args[1]
 
-	// Special support for auto-tarring up Go 1.4 tarballs from the 1.4 release branch.
-	is14Src := bucket == "golang" && go14BootstrapRx.MatchString(object)
-	if is14Src {
-		if *file != "-" {
-			log.Fatalf("invalid use of -file with Go 1.4 tarball %v", object)
-		}
-		*doGzip = true
-		*public = true
-		*cacheable = true
-	}
-
 	if *doGzip && !strings.HasSuffix(object, ".gz") {
 		log.Fatalf("-gzip flag requires object ending in .gz")
 	}
@@ -94,15 +72,7 @@ tar entry filename beginning with the prefix "go/".
 		log.Fatalf("storage.NewClient: %v", err)
 	}
 
-	if is14Src {
-		_, err := storageClient.Bucket(bucket).Object(object).Attrs(context.Background())
-		if err != storage.ErrObjectNotExist {
-			if err == nil {
-				log.Fatalf("object %v already exists; refusing to overwrite.", object)
-			}
-			log.Fatalf("error checking for %v: %v", object, err)
-		}
-	} else if alreadyUploaded(storageClient, bucket, object) {
+	if alreadyUploaded(storageClient, bucket, object) {
 		if *verbose {
 			log.Printf("gs://%s/%s up-to-date", bucket, object)
 		}
@@ -123,8 +93,6 @@ tar entry filename beginning with the prefix "go/".
 	}
 	var content io.Reader
 	switch {
-	case is14Src:
-		content = generate14Tarfile()
 	case *file == "-":
 		content = os.Stdin
 	default:
@@ -218,57 +186,3 @@ func alreadyUploaded(storageClient *storage.Client, bucket, object string) bool
 	}
 	return bytes.Equal(m5.Sum(nil), o.MD5)
 }
-
-// generate14Tarfile downloads the release-branch.go1.4 release branch
-// tarball and returns it uncompressed, with the "go/" prefix before
-// each tar header's filename.
-func generate14Tarfile() io.Reader {
-	const tarURL = "https://go.googlesource.com/go/+archive/release-branch.go1.4.tar.gz"
-	res, err := http.Get(tarURL)
-	if err != nil {
-		log.Fatal(err)
-	}
-	if res.StatusCode != 200 {
-		log.Fatalf("%v: %v", tarURL, res.Status)
-	}
-	if got, want := res.Header.Get("Content-Type"), "application/x-gzip"; got != want {
-		log.Fatalf("%v: response Content-Type = %q; expected %q", tarURL, got, want)
-	}
-
-	var out bytes.Buffer // output tar (not gzipped)
-
-	tw := tar.NewWriter(&out)
-
-	zr, err := gzip.NewReader(res.Body)
-	if err != nil {
-		log.Fatal(err)
-	}
-	tr := tar.NewReader(zr)
-
-	for {
-		hdr, err := tr.Next()
-		if err == io.EOF {
-			break
-		}
-		if err != nil {
-			log.Fatal(err)
-		}
-		switch hdr.Typeflag {
-		case tar.TypeReg, tar.TypeRegA, tar.TypeSymlink, tar.TypeDir:
-			// Accept these.
-		default:
-			continue
-		}
-		hdr.Name = "go/" + hdr.Name
-		if err := tw.WriteHeader(hdr); err != nil {
-			log.Fatalf("WriteHeader: %v", err)
-		}
-		if _, err := io.Copy(tw, tr); err != nil {
-			log.Fatalf("tar copying %v: %v", hdr.Name, err)
-		}
-	}
-	if err := tw.Close(); err != nil {
-		log.Fatal(err)
-	}
-	return &out
-}