Description: Add support for zst compression
Origin: https://github.com/aptly-dev/aptly/pull/1050/files/e686753656b340abbb80c593f43879bfc9806cfd
Reviewed-By: Anton Gladky <gladk@debian.org>
Last-Update: 2022-04-29

Index: aptly/deb/deb.go
===================================================================
--- aptly.orig/deb/deb.go
+++ aptly/deb/deb.go
@@ -16,6 +16,7 @@ import (
 
 	"github.com/aptly-dev/aptly/pgp"
 	"github.com/kjk/lzma"
+	"github.com/klauspost/compress/zstd"
 	"github.com/smira/go-xz"
 )
 
@@ -74,6 +75,13 @@ func GetControlFileFromDeb(packageFile s
 				}
 				defer unxz.Close()
 				tarInput = unxz
+			case "control.tar.zst":
+				unzstd, err := zstd.NewReader(bufReader)
+				if err != nil {
+					return nil, errors.Wrapf(err, "unable to unzstd %s from %s", header.Name, packageFile)
+				}
+				defer unzstd.Close()
+				tarInput = unzstd
 			default:
 				return nil, fmt.Errorf("unsupported tar compression in %s: %s", packageFile, header.Name)
 			}
@@ -189,6 +197,13 @@ func GetContentsFromDeb(file io.Reader,
 				unlzma := lzma.NewReader(bufReader)
 				defer unlzma.Close()
 				tarInput = unlzma
+			case "data.tar.zst":
+				unzstd, err := zstd.NewReader(bufReader)
+				if err != nil {
+					return nil, errors.Wrapf(err, "unable to unzstd %s from %s", header.Name, packageFile)
+				}
+				defer unzstd.Close()
+				tarInput = unzstd
 			default:
 				return nil, fmt.Errorf("unsupported tar compression in %s: %s", packageFile, header.Name)
 			}