build/release: Generate sha256sums also without the release tag. (#4318)

Ref #4306

buildscripts/build.sh

@@ -45,6 +45,8 @@ go_build() {
     release_real_bin="$release_str/$os-$arch/$(basename $package)"
     # Release sha256sum name
     release_sha256sum="$release_str/$os-$arch/$(basename $package).${release_tag}.sha256sum"
+    # Release sha256sum default
+    release_sha256sum_default="$release_str/$os-$arch/$(basename $package).sha256sum"
 
     # Go build to build the binary.
     if [ "${arch}" == "arm" ]; then
@@ -60,10 +62,13 @@ go_build() {
 
         # Release sha256sum name
         release_sha256sum_6="$release_str/$os-${arch}6vl/$(basename $package).${release_tag}.sha256sum"
+        # Release sha256sum default
+        release_sha256sum_default_6="$release_str/$os-${arch}6vl/$(basename $package).sha256sum"
 
         # Calculate shasum
         shasum_str=$(${SHASUM} -a 256 ${release_bin_6})
         echo ${shasum_str} | $SED "s/$release_str\/$os-${arch}6vl\///g" > $release_sha256sum_6
+        $CP -p $release_sha256sum_6 $release_sha256sum_default_6
 
         # Release binary downloadable name
         release_real_bin_7="$release_str/$os-$arch/$(basename $package)"
@@ -77,10 +82,13 @@ go_build() {
 
         # Release sha256sum name
         release_sha256sum_7="$release_str/$os-$arch/$(basename $package).${release_tag}.sha256sum"
+        # Release sha256sum default
+        release_sha256sum_default_7="$release_str/$os-${arch}/$(basename $package).sha256sum"
 
         # Calculate sha256sum
         shasum_str=$(${SHASUM} -a 256 ${release_bin_7})
         echo ${shasum_str} | $SED "s/$release_str\/$os-$arch\///g" > $release_sha256sum_7
+        $CP -p $release_sha256sum_7 $release_sha256sum_default_7
     else
         GOOS=$os GOARCH=$arch go build --ldflags "${LDFLAGS}" -o $release_bin
 
@@ -94,6 +102,7 @@ go_build() {
         # Calculate shasum
         sha256sum_str=$(${SHASUM} -a 256 ${release_bin})
         echo ${sha256sum_str} | $SED "s/$release_str\/$os-$arch\///g" > $release_sha256sum
+        $CP -p $release_sha256sum $release_sha256sum_default
     fi
 }
 

cmd/update-main.go

@@ -173,7 +173,6 @@ func downloadReleaseData(releaseChecksumURL string, timeout time.Duration, mode
 	if resp.StatusCode != http.StatusOK {
 		return data, fmt.Errorf("Error downloading URL %s. Response: %v", releaseChecksumURL, resp.Status)
 	}
-
 	dataBytes, err := ioutil.ReadAll(resp.Body)
 	if err != nil {
 		return data, fmt.Errorf("Error reading response. %s", err)
@@ -185,7 +184,11 @@ func downloadReleaseData(releaseChecksumURL string, timeout time.Duration, mode
 
 // DownloadReleaseData - downloads release data from minio official server.
 func DownloadReleaseData(timeout time.Duration, mode string) (data string, err error) {
-	return downloadReleaseData(minioReleaseURL+"minio.shasum", timeout, mode)
+	data, err = downloadReleaseData(minioReleaseURL+"minio.shasum", timeout, mode)
+	if err == nil {
+		return data, nil
+	}
+	return downloadReleaseData(minioReleaseURL+"minio.sha256sum", timeout, mode)
 }
 
 func parseReleaseData(data string) (releaseTime time.Time, err error) {