Example for src-d/go-git#923

Author: fkorotkov

.gitignore

@@ -12,3 +12,6 @@
 
 # Project-local glide cache, RE: https://github.com/Masterminds/glide/issues/736
 .glide/
+
+.idea
+temp

Gopkg.lock

@@ -1 +1 @@
-Example for https://github.com/src-d/go-git/issues/708
+Example for https://github.com/src-d/go-git/issues/923

README.md

@@ -5,33 +5,41 @@ import (
 	"gopkg.in/src-d/go-git.v4"
 	. "gopkg.in/src-d/go-git.v4/_examples"
 	"gopkg.in/src-d/go-git.v4/plumbing"
-	"log"
 	"os"
-	"time"
 )
 
 func main() {
 	cloneDirPtr := flag.String("clone-dir", os.Args[0], "Directory to clone")
-	cloneUrlPtr := flag.String("clone-url", "https://github.com/fkorotkov/go-git-clone-example", "URL to clone")
-	refPtr := flag.String("ref", "refs/heads/master", "reference to clone")
-	depthPtr := flag.Int("depth", 50, "depth to clone")
-	singleBranchPtr := flag.Bool("single-branch", true, "clone only single branch")
+	cloneUrlPtr := flag.String("clone-url", "https://github.com/flutter/flutter", "URL to clone")
+	shaPtr := flag.String("sha", "", "sha to clone")
 	flag.Parse()
 
 	cloneOptions := git.CloneOptions{
 		URL:           *cloneUrlPtr,
-		ReferenceName: plumbing.ReferenceName(*refPtr),
-		Depth:         *depthPtr,
-		SingleBranch:  *singleBranchPtr,
+		ReferenceName: plumbing.ReferenceName("refs/heads/master"),
+		SingleBranch:  true,
 		Progress:      os.Stdout,
-		Tags: 		   git.NoTags,	 
+		Tags:          git.NoTags,
 	}
+	repo, err := git.PlainClone(*cloneDirPtr, false, &cloneOptions)
+	CheckIfError(err)
+	reference, err := repo.Head()
+	CheckIfError(err)
+	Info("Cloned! Head at %s", reference)
+
+	workTree, err := repo.Worktree()
+	CheckIfError(err)
 
-	start := time.Now()
-	Info("Options %s", cloneOptions)
-	_, err := git.PlainClone(*cloneDirPtr, false, &cloneOptions)
-	elapsed := time.Now().Sub(start)
-	log.Printf("Cloned in %s", elapsed)
+	err = workTree.Reset(&git.ResetOptions{
+		Commit: plumbing.NewHash(*shaPtr),
+		Mode:   git.HardReset,
+	})
+	CheckIfError(err)
+	Info("Hard reseted to %s", *shaPtr)
 
+	status, err := workTree.Status()
 	CheckIfError(err)
+	Info("Status after reset: %s", status)
+
+	repo.Storer.Index()
 }