[push] Simplify git clone for push (#1096)

## Summary

1. clone `.git` only for push (See https://stackoverflow.com/questions/38999901/clone-only-the-git-directory-of-a-git-repo for more information)
2. add `CreateDevboxTempDIr` to `fileutil` and reuse it in more cases

## How was it tested?

Author: hezhizhen

internal/boxcli/push.go

@@ -6,6 +6,7 @@ package boxcli
 import (
 	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
+
 	"go.jetpack.io/devbox"
 )
 

internal/fileutil/dir.go

@@ -38,3 +38,8 @@ func ClearDir(dir string) error {
 	}
 	return errors.WithStack(os.MkdirAll(dir, mode))
 }
+
+func CreateDevboxTempDir() (string, error) {
+	tmpDir, err := os.MkdirTemp("", "devbox")
+	return tmpDir, errors.WithStack(err)
+}

internal/pullbox/config.go

@@ -8,9 +8,9 @@ import (
 	"os"
 	"path/filepath"
 
-	"github.com/pkg/errors"
 	"go.jetpack.io/devbox/internal/cuecfg"
 	"go.jetpack.io/devbox/internal/devconfig"
+	"go.jetpack.io/devbox/internal/fileutil"
 )
 
 func (p *pullbox) IsTextDevboxConfig() bool {
@@ -33,9 +33,9 @@ func (p *pullbox) pullTextDevboxConfig() error {
 		return err
 	}
 
-	tmpDir, err := os.MkdirTemp("", "devbox")
+	tmpDir, err := fileutil.CreateDevboxTempDir()
 	if err != nil {
-		return errors.WithStack(err)
+		return err
 	}
 	if err = cfg.SaveTo(tmpDir); err != nil {
 		return err

internal/pullbox/git/git.go

@@ -4,20 +4,22 @@
 package git
 
 import (
-	"os"
 	"strings"
 
 	"github.com/pkg/errors"
+
 	"go.jetpack.io/devbox/internal/cmdutil"
+	"go.jetpack.io/devbox/internal/fileutil"
 )
 
 func CloneToTmp(repo string) (string, error) {
-	tmpDir, err := os.MkdirTemp("", "devbox")
+	tmpDir, err := fileutil.CreateDevboxTempDir()
 	if err != nil {
-		return "", errors.WithStack(err)
+		return "", err
 	}
+
 	if err := clone(repo, tmpDir); err != nil {
-		return "", errors.WithStack(err)
+		return "", err
 	}
 	return tmpDir, nil
 }

internal/pullbox/git/push.go

@@ -1,23 +1,26 @@
+// Copyright 2023 Jetpack Technologies Inc and contributors. All rights reserved.
+// Use of this source code is governed by the license in the LICENSE file.
+
 package git
 
 import (
-	"os"
-	"path/filepath"
 	"strings"
 
 	"github.com/pkg/errors"
+
 	"go.jetpack.io/devbox/internal/cmdutil"
 	"go.jetpack.io/devbox/internal/fileutil"
 )
 
 const nothingToCommitErrorText = "nothing to commit"
 
 func Push(dir, url string) error {
-	tmpDir, err := CloneToTmp(url)
+	tmpDir, err := fileutil.CreateDevboxTempDir()
 	if err != nil {
 		return err
 	}
-	if err := removeNonGitFiles(tmpDir); err != nil {
+
+	if err := cloneGitHistory(url, tmpDir); err != nil {
 		return err
 	}
 
@@ -32,6 +35,13 @@ func Push(dir, url string) error {
 	return push(tmpDir)
 }
 
+func cloneGitHistory(url, dst string) error {
+	// See https://stackoverflow.com/questions/38999901/clone-only-the-git-directory-of-a-git-repo
+	cmd := cmdutil.CommandTTY("git", "clone", "--no-checkout", url, dst)
+	cmd.Dir = dst
+	return errors.WithStack(cmd.Run())
+}
+
 func createCommit(dir string) error {
 	cmd := cmdutil.CommandTTY("git", "add", ".")
 	cmd.Dir = dir
@@ -54,19 +64,3 @@ func push(dir string) error {
 	err := cmd.Run()
 	return errors.WithStack(err)
 }
-
-func removeNonGitFiles(dir string) error {
-	entries, err := os.ReadDir(dir)
-	if err != nil {
-		return err
-	}
-	for _, entry := range entries {
-		if entry.Name() == ".git" {
-			continue
-		}
-		if err := os.RemoveAll(filepath.Join(dir, entry.Name())); err != nil {
-			return err
-		}
-	}
-	return nil
-}