Add support for 'tar.xz' files

go.mod

@@ -5,6 +5,7 @@ go 1.17
 require (
 	github.com/spf13/cobra v1.2.1
 	github.com/stretchr/testify v1.7.0
+	github.com/ulikunitz/xz v0.5.10
 )
 
 require (

go.sum

@@ -221,6 +221,8 @@ github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/
 github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/subosito/gotenv v1.2.0/go.mod h1:N0PQaV/YGNqwC0u51sEeR/aUtSLEXKX9iv69rRypqCw=
+github.com/ulikunitz/xz v0.5.10 h1:t92gobL9l3HE202wg3rlk19F6X+JOxl9BBrCCMYEYd8=
+github.com/ulikunitz/xz v0.5.10/go.mod h1:nbz6k7qbPmH4IRqmfOplQw/tblSgqTqBwxkY0oWt/14=
 github.com/yuin/goldmark v1.1.25/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.1.32/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=

tools/storage.go

@@ -1,12 +1,39 @@
 package tools
 
 import (
+	"compress/gzip"
 	"errors"
 	"fmt"
 	"io"
 	"os"
+	"strings"
+
+	"github.com/ulikunitz/xz"
 )
 
+func compressedReader(file *os.File) (io.Reader, error) {
+	var comp io.Reader
+
+	var err error
+
+	switch {
+	case strings.HasSuffix(file.Name(), ".gz"):
+		comp, err = gzip.NewReader(file)
+		if err != nil {
+			return nil, fmt.Errorf("gzip.NewReader: %w", err)
+		}
+	case strings.HasSuffix(file.Name(), ".xz"):
+		comp, err = xz.NewReader(file)
+		if err != nil {
+			return nil, fmt.Errorf("xz.NewReader: %w", err)
+		}
+	default:
+		return nil, fmt.Errorf("unknown archive type for %v", file.Name())
+	}
+
+	return comp, nil
+}
+
 func saveBinary(src io.Reader, dest string) error {
 	err := saveFile(src, dest)
 	if err != nil {

tools/tools.go

@@ -2,7 +2,6 @@ package tools
 
 import (
 	"archive/tar"
-	"compress/gzip"
 	"errors"
 	"fmt"
 	"io"
@@ -70,12 +69,12 @@ func (t *Tool) Extract() error {
 	defer os.Remove(t.Asset.Name)
 	defer file.Close()
 
-	gzfile, err := gzip.NewReader(file)
+	compFile, err := compressedReader(file)
 	if err != nil {
-		return fmt.Errorf("gzip.NewReader: %w", err)
+		return fmt.Errorf("compressedReader: %w", err)
 	}
 
-	tr := tar.NewReader(gzfile)
+	tr := tar.NewReader(compFile)
 
 	for {
 		hdr, err := tr.Next()