diff --git a/pkg/git/commit.go b/pkg/git/commit.go
index 50793cd..49ed170 100644
--- a/pkg/git/commit.go
+++ b/pkg/git/commit.go
@@ -2,15 +2,13 @@ package git
 
 import (
 	"errors"
-	"os"
+	"fmt"
+	"path/filepath"
+	"strings"
 	"time"
 
 	"github.com/ProtonMail/go-crypto/openpgp"
-	"github.com/ProtonMail/go-crypto/openpgp/armor"
-	"github.com/go-git/go-billy/v5"
 	"github.com/go-git/go-git/v5"
-	"github.com/go-git/go-git/v5/config"
-	"github.com/go-git/go-git/v5/plumbing"
 	"github.com/go-git/go-git/v5/plumbing/object"
 )
 
@@ -36,10 +34,16 @@ func WithCommitter(name, email string) CommitOption {
 	}
 }
 
-func WithFileContent(content []byte, file billy.File) CommitOption {
+func WithFileContent(content []byte, filename, folder string) CommitOption {
 	return func(c *Commit) {
 		c.Content = content
-		c.File = file
+		c.Filename = filepath.Join(folder, fmt.Sprintf("%s.json", filename))
+	}
+}
+
+func WithSigner(signKey SignKey) CommitOption {
+	return func(c *Commit) {
+		c.signKey = signKey.entity
 	}
 }
 
@@ -47,9 +51,11 @@ type Commit struct {
 	Author    *object.Signature
 	Committer *object.Signature
 	Content   []byte
-	File      billy.File
+	Filename  string
+	KeyFile   string
 
 	project *Project
+	signKey *openpgp.Entity
 }
 
 func (p *Project) NewCommit(options ...CommitOption) *Commit {
@@ -63,64 +69,11 @@ func (p *Project) NewCommit(options ...CommitOption) *Commit {
 }
 
 func (c *Commit) Create(msg string) error {
-	var (
-		signer *openpgp.Entity
-	)
-
-	if c.project.KeyFile != "" {
-		file, err := os.Open(c.project.KeyFile)
-		if err != nil {
-			return err
-		}
-		defer file.Close()
-
-		block, err := armor.Decode(file)
-		if err != nil {
-			return err
-		}
-
-		entityList, err := openpgp.ReadKeyRing(block.Body)
-		if err != nil || len(entityList) < 1 {
-			return err
-		}
-
-		signer = entityList[0]
-	}
-
-	worktree, err := c.project.repository.Worktree()
-	if err != nil {
+	if err := c.addContent(); err != nil {
 		return err
 	}
 
-	_, err = c.project.repository.Branch(c.project.Branch)
-	if errors.Is(err, git.ErrBranchNotFound) {
-		err = c.project.repository.CreateBranch(
-			&config.Branch{Name: c.project.Branch, Remote: c.project.Branch},
-		)
-		if err != nil {
-			return err
-		}
-	}
-	if err != nil {
-		return err
-	}
-
-	err = worktree.Checkout(&git.CheckoutOptions{
-		Branch: plumbing.ReferenceName(c.project.Branch),
-	})
-	if err != nil {
-		return err
-	}
-
-	if _, err = c.File.Write(c.Content); err != nil {
-		return err
-	}
-
-	if err = c.File.Close(); err != nil {
-		return err
-	}
-
-	if _, err = worktree.Add(c.File.Name()); err != nil {
+	if _, err := c.project.worktree.Add(c.Filename); err != nil {
 		return err
 	}
 
@@ -130,25 +83,41 @@ func (c *Commit) Create(msg string) error {
 		commitOpts.Committer = c.Committer
 	}
 
-	if signer != nil {
-		commitOpts.SignKey = signer
+	if c.signKey != nil {
+		commitOpts.SignKey = c.signKey
 	}
 
-	_, err = worktree.Commit(msg, &commitOpts)
-	return err
-}
-
-func (c *Commit) Push() error {
-	origin, err := c.project.repository.Remote("origin")
+	_, err := c.project.worktree.Commit(msg, &commitOpts)
 	if err != nil {
 		return err
 	}
 
-	pushOpts := git.PushOptions{}
+	return nil
+}
 
-	if c.project.auth != nil {
-		pushOpts.Auth = c.project.auth
+func (c *Commit) Exists(uid string, id uint) bool {
+	commitIter, err := c.project.repository.Log(&git.LogOptions{})
+	if err != nil {
+		return false
 	}
 
-	return origin.Push(&pushOpts)
+	err = commitIter.ForEach(func(commit *object.Commit) error {
+		if strings.Contains(commit.Message, fmt.Sprintf("Update %s", uid)) &&
+			strings.Contains(commit.Message, fmt.Sprintf("version %d", id)) {
+			return errors.New("version already committed")
+		}
+		return nil
+	})
+	return err != nil
+}
+
+func (c *Commit) addContent() error {
+	file, err := c.project.worktree.Filesystem.Create(c.Filename)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+
+	_, err = file.Write(c.Content)
+	return err
 }
diff --git a/pkg/git/project.go b/pkg/git/project.go
index ea823b2..d10a145 100644
--- a/pkg/git/project.go
+++ b/pkg/git/project.go
@@ -1,9 +1,13 @@
 package git
 
 import (
+	"context"
+	"errors"
+
 	"github.com/go-git/go-billy/v5"
 	"github.com/go-git/go-billy/v5/memfs"
 	"github.com/go-git/go-git/v5"
+	"github.com/go-git/go-git/v5/plumbing"
 	"github.com/go-git/go-git/v5/plumbing/transport"
 	"github.com/go-git/go-git/v5/plumbing/transport/http"
 	"github.com/go-git/go-git/v5/storage/memory"
@@ -26,28 +30,21 @@ func WithBranch(branch string) ProjectOption {
 	}
 }
 
-func WithKey(path string) ProjectOption {
-	return func(p *Project) {
-		p.KeyFile = path
-	}
-}
-
 type Project struct {
 	Branch  string
+	Force   bool
 	RepoURL string
-	KeyFile string
 
 	auth       transport.AuthMethod
 	fs         billy.Filesystem
 	storer     *memory.Storage
 	repository *git.Repository
+	worktree   *git.Worktree
 }
 
 func NewProject(url string, options ...ProjectOption) *Project {
 	project := &Project{
-		Branch:     "",
 		RepoURL:    url,
-		KeyFile:    "",
 		fs:         memfs.New(),
 		storer:     memory.NewStorage(),
 		repository: nil,
@@ -60,20 +57,120 @@ func NewProject(url string, options ...ProjectOption) *Project {
 	return project
 }
 
-func (p *Project) Clone() error {
+func (p *Project) Checkout() error {
+	branchRef := plumbing.NewBranchReferenceName(p.Branch)
+
+	_, err := p.repository.Reference(branchRef, true)
+	if errors.Is(err, plumbing.ErrReferenceNotFound) {
+		var headRef *plumbing.Reference
+		headRef, err = p.repository.Head()
+		if err != nil {
+			return err
+		}
+
+		ref := plumbing.NewHashReference(branchRef, headRef.Hash())
+		if err = p.repository.Storer.SetReference(ref); err != nil {
+			return err
+		}
+	} else if err != nil {
+		return err
+	}
+
+	p.worktree, err = p.repository.Worktree()
+	if err != nil {
+		return err
+	}
+
+	checkoutOpts := git.CheckoutOptions{
+		Branch: branchRef,
+		Create: false,
+	}
+
+	if err = checkoutOpts.Validate(); err != nil {
+		return err
+	}
+
+	return p.worktree.Checkout(&checkoutOpts)
+}
+
+func (p *Project) Clone(ctx context.Context) error {
 	cloneOpts := git.CloneOptions{
-		URL: p.RepoURL,
+		URL:               p.RepoURL,
+		RecurseSubmodules: git.DefaultSubmoduleRecursionDepth,
 	}
 
 	if p.auth != nil {
 		cloneOpts.Auth = p.auth
 	}
 
+	if err := cloneOpts.Validate(); err != nil {
+		return err
+	}
+
 	var err error
-	p.repository, err = git.Clone(
+	p.repository, err = git.CloneContext(
+		ctx,
 		p.storer,
 		p.fs,
 		&cloneOpts,
 	)
-	return err
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (p *Project) HasChanges() bool {
+	remoteBranchRef := plumbing.NewRemoteReferenceName("origin", p.Branch)
+	remoteBranch, err := p.repository.Reference(remoteBranchRef, true)
+	if errors.Is(err, plumbing.ErrReferenceNotFound) {
+		return true
+	} else if err != nil {
+		return false
+	}
+
+	localBranchRef, err := p.repository.Reference(plumbing.NewBranchReferenceName(p.Branch), true)
+	if err != nil {
+		return false
+	}
+
+	if localBranchRef.Hash() != remoteBranch.Hash() {
+		return true
+	}
+
+	return false
+}
+
+func (p *Project) Pull(ctx context.Context) error {
+	pullOpts := git.PullOptions{
+		ReferenceName: plumbing.NewBranchReferenceName(p.Branch),
+	}
+
+	if err := pullOpts.Validate(); err != nil {
+		return err
+	}
+
+	err := p.worktree.PullContext(ctx, &pullOpts)
+	if !errors.Is(err, plumbing.ErrReferenceNotFound) && err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (p *Project) Push(ctx context.Context) error {
+	pushOpts := git.PushOptions{
+		RemoteName: "origin",
+	}
+
+	if p.auth != nil {
+		pushOpts.Auth = p.auth
+	}
+
+	if err := pushOpts.Validate(); err != nil {
+		return err
+	}
+
+	return p.repository.PushContext(ctx, &pushOpts)
 }
diff --git a/pkg/git/sign_key.go b/pkg/git/sign_key.go
new file mode 100644
index 0000000..5ac350b
--- /dev/null
+++ b/pkg/git/sign_key.go
@@ -0,0 +1,35 @@
+package git
+
+import (
+	"os"
+
+	"github.com/ProtonMail/go-crypto/openpgp"
+	"github.com/ProtonMail/go-crypto/openpgp/armor"
+)
+
+type SignKey struct {
+	KeyFile string
+
+	entity *openpgp.Entity
+}
+
+func (s *SignKey) ReadKeyFile() error {
+	file, err := os.Open(s.KeyFile)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+
+	block, err := armor.Decode(file)
+	if err != nil {
+		return err
+	}
+
+	entityList, err := openpgp.ReadKeyRing(block.Body)
+	if err != nil || len(entityList) < 1 {
+		return err
+	}
+
+	s.entity = entityList[0]
+	return nil
+}