rebase.go

@@ -0,0 +1,152 @@
+package git
+
+/*
+#include <git2.h>
+*/
+import "C"
+import (
+	"errors"
+	"runtime"
+	"unsafe"
+)
+
+// RebaseOperationType is the type of rebase operation
+type RebaseOperationType uint
+
+const (
+	// RebaseOperationPick The given commit is to be cherry-picked.  The client should commit the changes and continue if there are no conflicts.
+	RebaseOperationPick RebaseOperationType = C.GIT_REBASE_OPERATION_PICK
+	// RebaseOperationEdit The given commit is to be cherry-picked, but the client should stop to allow the user to edit the changes before committing them.
+	RebaseOperationEdit RebaseOperationType = C.GIT_REBASE_OPERATION_EDIT
+	// RebaseOperationSquash The given commit is to be squashed into the previous commit.  The commit message will be merged with the previous message.
+	RebaseOperationSquash RebaseOperationType = C.GIT_REBASE_OPERATION_SQUASH
+	// RebaseOperationFixup No commit will be cherry-picked.  The client should run the given command and (if successful) continue.
+	RebaseOperationFixup RebaseOperationType = C.GIT_REBASE_OPERATION_FIXUP
+	// RebaseOperationExec No commit will be cherry-picked.  The client should run the given command and (if successful) continue.
+	RebaseOperationExec RebaseOperationType = C.GIT_REBASE_OPERATION_EXEC
+)
+
+// RebaseOperation describes a single instruction/operation to be performed during the rebase.
+type RebaseOperation struct {
+	Type RebaseOperationType
+	ID   *Oid
+	Exec string
+}
+
+func rebaseOperationFromC(c *C.git_rebase_operation) *RebaseOperation {
+	operation := &RebaseOperation{}
+	operation.Type = RebaseOperationType(c._type)
+	operation.ID = newOidFromC(&c.id)
+	operation.Exec = C.GoString(c.exec)
+
+	return operation
+}
+
+// RebaseOptions are used to tell the rebase machinery how to operate
+type RebaseOptions struct{}
+
+// Rebase object wrapper for C pointer
+type Rebase struct {
+	ptr *C.git_rebase
+}
+
+//RebaseInit initializes a rebase operation to rebase the changes in branch relative to upstream onto another branch.
+func (r *Repository) RebaseInit(branch *AnnotatedCommit, upstream *AnnotatedCommit, onto *AnnotatedCommit, opts *RebaseOptions) (*Rebase, error) {
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	//TODO : use real rebase_options
+	if opts != nil {
+		return nil, errors.New("RebaseOptions Not implemented yet")
+	}
+
+	if branch == nil {
+		branch = &AnnotatedCommit{ptr: nil}
+	}
+
+	if upstream == nil {
+		upstream = &AnnotatedCommit{ptr: nil}
+	}
+
+	if onto == nil {
+		onto = &AnnotatedCommit{ptr: nil}
+	}
+
+	var ptr *C.git_rebase
+	err := C.git_rebase_init(&ptr, r.ptr, branch.ptr, upstream.ptr, onto.ptr, nil)
+	if err < 0 {
+		return nil, MakeGitError(err)
+	}
+
+	return newRebaseFromC(ptr), nil
+}
+
+// Next performs the next rebase operation and returns the information about it.
+// If the operation is one that applies a patch (which is any operation except GIT_REBASE_OPERATION_EXEC)
+// then the patch will be applied and the index and working directory will be updated with the changes.
+// If there are conflicts, you will need to address those before committing the changes.
+func (rebase *Rebase) Next() (*RebaseOperation, error) {
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	var ptr *C.git_rebase_operation
+	err := C.git_rebase_next(&ptr, rebase.ptr)
+	if err < 0 {
+		return nil, MakeGitError(err)
+	}
+
+	return rebaseOperationFromC(ptr), nil
+}
+
+// Commit commits the current patch.
+// You must have resolved any conflicts that were introduced during the patch application from the git_rebase_next invocation.
+func (rebase *Rebase) Commit(ID *Oid, author, committer *Signature, message string) error {
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	authorSig, err := author.toC()
+	if err != nil {
+		return err
+	}
+	defer C.git_signature_free(authorSig)
+
+	committerSig, err := committer.toC()
+	if err != nil {
+		return err
+	}
+
+	cmsg := C.CString(message)
+	defer C.free(unsafe.Pointer(cmsg))
+
+	cerr := C.git_rebase_commit(ID.toC(), rebase.ptr, authorSig, committerSig, nil, cmsg)
+	if cerr < 0 {
+		return MakeGitError(cerr)
+	}
+
+	return nil
+}
+
+// Finish finishes a rebase that is currently in progress once all patches have been applied.
+func (rebase *Rebase) Finish() error {
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	err := C.git_rebase_finish(rebase.ptr, nil)
+	if err < 0 {
+		return MakeGitError(err)
+	}
+
+	return nil
+}
+
+//Free frees the Rebase object and underlying git_rebase C pointer.
+func (rebase *Rebase) Free() {
+	runtime.SetFinalizer(rebase, nil)
+	C.git_reference_free(rebase.ptr)
+}
+
+func newRebaseFromC(ptr *C.git_rebase) *Rebase {
+	rebase := &Rebase{ptr: ptr}
+	runtime.SetFinalizer(rebase, (*Rebase).Free)
+	return rebase
+}

rebase_test.go

@@ -0,0 +1,167 @@
+package git
+
+import (
+	"testing"
+	"time"
+)
+
+func createBranch(repo *Repository, branch string) error {
+	head, err := repo.Head()
+	if err != nil {
+		return err
+	}
+	commit, err := repo.LookupCommit(head.Target())
+	if err != nil {
+		return err
+	}
+	_, err = repo.CreateBranch(branch, commit, false)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func signature() *Signature {
+	return &Signature{
+		Name:  "Emile",
+		Email: "emile@emile.com",
+		When:  time.Now(),
+	}
+}
+
+func commitSomething(repo *Repository, something string) (*Oid, error) {
+	head, err := repo.Head()
+	if err != nil {
+		return nil, err
+	}
+
+	headCommit, err := repo.LookupCommit(head.Target())
+	if err != nil {
+		return nil, err
+	}
+
+	index, err := NewIndex()
+	if err != nil {
+		return nil, err
+	}
+	defer index.Free()
+
+	blobOID, err := repo.CreateBlobFromBuffer([]byte("fou"))
+	if err != nil {
+		return nil, err
+	}
+
+	entry := &IndexEntry{
+		Mode: FilemodeBlob,
+		Id:   blobOID,
+		Path: something,
+	}
+
+	if err := index.Add(entry); err != nil {
+		return nil, err
+	}
+
+	newTreeOID, err := index.WriteTreeTo(repo)
+	if err != nil {
+		return nil, err
+	}
+
+	newTree, err := repo.LookupTree(newTreeOID)
+	if err != nil {
+		return nil, err
+	}
+
+	if err != nil {
+		return nil, err
+	}
+	commit, err := repo.CreateCommit("HEAD", signature(), signature(), "Test rebase onto, Baby! "+something, newTree, headCommit)
+	if err != nil {
+		return nil, err
+	}
+
+	opts := &CheckoutOpts{
+		Strategy: CheckoutRemoveUntracked | CheckoutForce,
+	}
+	err = repo.CheckoutIndex(index, opts)
+	if err != nil {
+		return nil, err
+	}
+
+	return commit, nil
+}
+
+func entryExists(repo *Repository, file string) bool {
+	head, err := repo.Head()
+	if err != nil {
+		return false
+	}
+	headCommit, err := repo.LookupCommit(head.Target())
+	if err != nil {
+		return false
+	}
+	headTree, err := headCommit.Tree()
+	if err != nil {
+		return false
+	}
+	_, err = headTree.EntryByPath(file)
+
+	return err == nil
+}
+
+func TestRebaseOnto(t *testing.T) {
+	repo := createTestRepo(t)
+	defer cleanupTestRepo(t, repo)
+
+	fileInMaster := "something"
+	fileInEmile := "something else"
+
+	// Seed master
+	seedTestRepo(t, repo)
+
+	// Create a new branch from master
+	err := createBranch(repo, "emile")
+	checkFatal(t, err)
+
+	// Create a commit in master
+	_, err = commitSomething(repo, fileInMaster)
+	checkFatal(t, err)
+
+	// Switch to this emile
+	err = repo.SetHead("refs/heads/emile")
+	checkFatal(t, err)
+
+	// Check master commit is not in emile branch
+	if entryExists(repo, fileInMaster) {
+		t.Fatal("something entry should not exist in emile branch")
+	}
+
+	// Create a commit in emile
+	_, err = commitSomething(repo, fileInEmile)
+	checkFatal(t, err)
+
+	// Rebase onto master
+	master, err := repo.LookupBranch("master", BranchLocal)
+	branch, err := repo.AnnotatedCommitFromRef(master.Reference)
+	checkFatal(t, err)
+
+	rebase, err := repo.RebaseInit(nil, nil, branch, nil)
+	checkFatal(t, err)
+	defer rebase.Free()
+
+	operation, err := rebase.Next()
+	checkFatal(t, err)
+
+	commit, err := repo.LookupCommit(operation.ID)
+	checkFatal(t, err)
+
+	err = rebase.Commit(operation.ID, signature(), signature(), commit.Message())
+	checkFatal(t, err)
+
+	rebase.Finish()
+
+	// Check master commit is now also in emile branch
+	if !entryExists(repo, fileInMaster) {
+		t.Fatal("something entry should now exist in emile branch")
+	}
+}