diff --git a/pkg/export/export.go b/pkg/export/export.go
index bf06e04..33c472f 100644
--- a/pkg/export/export.go
+++ b/pkg/export/export.go
@@ -5,19 +5,20 @@ import (
 	"errors"
 	"flag"
 	"fmt"
-	"github.com/genshen/cmds"
-	"github.com/genshen/pkg"
-	"github.com/mholt/archives"
-	log "github.com/sirupsen/logrus"
 	"os"
 	"path/filepath"
 	"strings"
 	"time"
+
+	"github.com/genshen/cmds"
+	"github.com/genshen/pkg"
+	"github.com/mholt/archives"
+	log "github.com/sirupsen/logrus"
 )
 
 var exportCommand = &cmds.Command{
 	Name:        "export",
-	Summary:     "export dependency packages export a tarball file",
+	Summary:     "export dependency packages to a tarball file",
 	Description: "export dependency packages to a tarball file (.tar) specified by a file path",
 	CustomFlags: false,
 	HasOptions:  true,
diff --git a/pkg/fetch/cache_strategy.go b/pkg/fetch/cache_strategy.go
index 56ae58b..b6d7a48 100644
--- a/pkg/fetch/cache_strategy.go
+++ b/pkg/fetch/cache_strategy.go
@@ -11,7 +11,7 @@ const (
 	CacheStrategyCopyFromGlobalCache CacheStrategy = iota                            // package exits at user home's global cache directory.
 	CacheStrategyUserLocalVendor     CacheStrategy = iota                            // package exist in project's vendor/src directory.
 	CacheStrategySkip                CacheStrategy = iota                            // skip package downloading or local copying
-	CacheStrategyDefault             CacheStrategy = CacheStrategyDownloadFromRemote // package exist in project's vendor/src directory.
+	CacheStrategyDefault                           = CacheStrategyDownloadFromRemote // package exist in project's vendor/src directory.
 )
 
 type CacheStrategy int
@@ -29,7 +29,7 @@ func determinePackageCacheStrategy(packageMeta pkg.PackageMeta, projectRoot stri
 				return nil, CacheStrategyDownloadFromRemote
 			}
 			return err, CacheStrategySkip
-		} else {         // vendor src does not exist, but global cache exist.
+		} else { // vendor src does not exist, but global cache exist.
 			if noCache { // if noCache, directly download. Don't use global cache.
 				return err, CacheStrategyDownloadFromRemote
 			}
diff --git a/pkg/fetch/cmake_lib.go b/pkg/fetch/cmake_lib.go
index 790674a..2007539 100644
--- a/pkg/fetch/cmake_lib.go
+++ b/pkg/fetch/cmake_lib.go
@@ -3,13 +3,14 @@ package fetch
 import (
 	"bufio"
 	"fmt"
-	"github.com/genshen/pkg"
-	log "github.com/sirupsen/logrus"
 	"io"
 	"os"
 	"path/filepath"
 	"strings"
 	"text/template"
+
+	"github.com/genshen/pkg"
+	log "github.com/sirupsen/logrus"
 )
 
 type cmakeDepData struct {
diff --git a/pkg/fetch/features.go b/pkg/fetch/features.go
index a7983fd..e84532a 100644
--- a/pkg/fetch/features.go
+++ b/pkg/fetch/features.go
@@ -2,8 +2,9 @@ package fetch
 
 import (
 	"fmt"
-	"github.com/genshen/pkg"
 	"log"
+
+	"github.com/genshen/pkg"
 )
 
 const FEATURE_DEBUG = true
diff --git a/pkg/fetch/fetch.go b/pkg/fetch/fetch.go
index d732404..a411630 100644
--- a/pkg/fetch/fetch.go
+++ b/pkg/fetch/fetch.go
@@ -5,6 +5,12 @@ import (
 	"errors"
 	"flag"
 	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"strings"
+	"text/template"
+
 	"github.com/AlecAivazis/survey/v2"
 	"github.com/genshen/cmds"
 	"github.com/genshen/pkg"
@@ -13,11 +19,6 @@ import (
 	"github.com/rogpeppe/go-internal/semver"
 	log "github.com/sirupsen/logrus"
 	"gopkg.in/yaml.v3"
-	"io"
-	"os"
-	"path/filepath"
-	"strings"
-	"text/template"
 )
 
 var fetchCommand = &cmds.Command{
diff --git a/pkg/fetch/src_dl.go b/pkg/fetch/src_dl.go
index 1f239b6..17ffb10 100644
--- a/pkg/fetch/src_dl.go
+++ b/pkg/fetch/src_dl.go
@@ -157,7 +157,7 @@ func archiveSrc(archiveType string, srcPath string, packageName string, remoteUr
 		archiveType = pkg.DefaultArchiveFormatType
 		log.WithFields(log.Fields{
 			"pkg": packageName,
-		}).Info("set archive package format type to default type: %s.", archiveType)
+		}).Infof("set archive package format type to default type: %s.", archiveType)
 	}
 
 	// save file.
@@ -267,7 +267,7 @@ func gitSrc(auths map[string]conf.Auth, packageCacheDir, packagePath, packageUrl
 			URL: proxyUrl,
 		},
 	}); err != nil {
-		log.Println("Error here", err)
+		log.Println("Error here", err, repoUrl)
 		return err
 	} else { // clone succeed.
 		// set filemode to false for Windows system
diff --git a/pkg/import/import.go b/pkg/import/import.go
index 94a3ca1..bedd846 100644
--- a/pkg/import/import.go
+++ b/pkg/import/import.go
@@ -5,13 +5,14 @@ import (
 	"errors"
 	"flag"
 	"fmt"
+	"os"
+	"path/filepath"
+
 	"github.com/genshen/cmds"
 	"github.com/genshen/pkg"
 	"github.com/mholt/archives"
 	cp "github.com/otiai10/copy"
 	log "github.com/sirupsen/logrus"
-	"os"
-	"path/filepath"
 )
 
 const ImportCacheDir = ".import.cache"
@@ -19,7 +20,7 @@ const ImportCacheDir = ".import.cache"
 var importCommand = &cmds.Command{
 	Name:        "import",
 	Summary:     "import dependency packages from tarball file",
-	Description: "import and extract dependency packages from tarball file (.tar) specified by a file path",
+	Description: "import and extract dependency packages from tarball file (.tar.gz) specified by a file path",
 	CustomFlags: false,
 	HasOptions:  true,
 }
diff --git a/pkg/init/init.go b/pkg/init/init.go
index 40943e8..4d0c738 100644
--- a/pkg/init/init.go
+++ b/pkg/init/init.go
@@ -3,11 +3,12 @@ package init
 import (
 	"errors"
 	"flag"
+	"os"
+	"path/filepath"
+
 	"github.com/genshen/cmds"
 	"github.com/genshen/pkg"
 	"gopkg.in/yaml.v3"
-	"os"
-	"path/filepath"
 )
 
 var initCommand = &cmds.Command{
diff --git a/pkg/install/build_pkg.go b/pkg/install/build_pkg.go
index 9eb3f5f..1a41053 100644
--- a/pkg/install/build_pkg.go
+++ b/pkg/install/build_pkg.go
@@ -2,8 +2,9 @@ package install
 
 import (
 	"fmt"
-	"github.com/genshen/pkg"
 	"strings"
+
+	"github.com/genshen/pkg"
 )
 
 // build pkg from dependency tree.
diff --git a/pkg/install/command.go b/pkg/install/command.go
index 3f4d142..24d2f1a 100644
--- a/pkg/install/command.go
+++ b/pkg/install/command.go
@@ -3,13 +3,14 @@ package install
 import (
 	"errors"
 	"fmt"
-	"github.com/genshen/pkg"
-	log "github.com/sirupsen/logrus"
 	"io"
 	"os"
 	"os/exec"
 	"path/filepath"
 	"strings"
+
+	"github.com/genshen/pkg"
+	log "github.com/sirupsen/logrus"
 )
 
 // run the instruction
diff --git a/pkg/install/install.go b/pkg/install/install.go
index 8191caf..862b50f 100644
--- a/pkg/install/install.go
+++ b/pkg/install/install.go
@@ -5,10 +5,11 @@ import (
 	"errors"
 	"flag"
 	"fmt"
+	"os"
+
 	"github.com/genshen/cmds"
 	"github.com/genshen/pkg"
 	log "github.com/sirupsen/logrus"
-	"os"
 )
 
 var buildCommand = &cmds.Command{
diff --git a/pkg/install/install_shell.go b/pkg/install/install_shell.go
index e511a39..e66ef60 100644
--- a/pkg/install/install_shell.go
+++ b/pkg/install/install_shell.go
@@ -4,10 +4,11 @@ import (
 	"bufio"
 	"errors"
 	"fmt"
-	"github.com/genshen/pkg"
 	"os"
 	"path/filepath"
 	"strings"
+
+	"github.com/genshen/pkg"
 )
 
 // writer instructions as shell format to file
diff --git a/pkg/list/list.go b/pkg/list/list.go
index e5714e2..45be1ed 100644
--- a/pkg/list/list.go
+++ b/pkg/list/list.go
@@ -4,10 +4,11 @@ import (
 	"errors"
 	"flag"
 	"fmt"
-	"github.com/genshen/cmds"
-	"github.com/genshen/pkg"
 	"os"
 	"sort"
+
+	"github.com/genshen/cmds"
+	"github.com/genshen/pkg"
 )
 
 var listCommand = &cmds.Command{
diff --git a/pkg/version/version.go b/pkg/version/version.go
index 77d2759..9b8e958 100644
--- a/pkg/version/version.go
+++ b/pkg/version/version.go
@@ -3,6 +3,7 @@ package version
 import (
 	"flag"
 	"fmt"
+
 	"github.com/genshen/cmds"
 	"github.com/genshen/pkg"
 )
@@ -16,8 +17,8 @@ var versionCommand = &cmds.Command{
 }
 
 var (
-	GitCommitID string = "unknown"
-	BuildTime 	string = ""
+	GitCommitID = "unknown"
+	BuildTime   = ""
 )
 
 func init() {