Merge branch 'master' into v22

README.md

@@ -3,15 +3,28 @@ git2go
 [![GoDoc](https://godoc.org/github.com/libgit2/git2go?status.svg)](http://godoc.org/github.com/libgit2/git2go) [![Build Status](https://travis-ci.org/libgit2/git2go.svg?branch=v22)](https://travis-ci.org/libgit2/git2go)
 
 
-Go bindings for [libgit2](http://libgit2.github.com/). The master branch follows the latest libgit2 release.
+Go bindings for [libgit2](http://libgit2.github.com/). The `master` branch follows the latest libgit2 release. The versioned branches indicate which libgit2 version they work against.
 
 Installing
 ----------
 
-This project needs libgit2, which is written in C so we need to build that as well. In order to build libgit2, you need `cmake`, `pkg-config` and a C compiler. You will also need the development packages for OpenSSL and LibSSH2 if you want to use HTTPS and SSH respectively.
+This project needs libgit2, which is written in C so we need to build that as well. In order to build libgit2, you need `cmake`, `pkg-config` and a C compiler. You will also need the development packages for OpenSSL and LibSSH2 installed if you want libgit2 to support HTTPS and SSH respectively.
+
+### Stable version
+
+git2go has versioned branches which indicate which version of libgit2 they work against. Install the development package it on your system via your favourite package manager or from source and you can use a service like gopkg.in to use the appropriate version. For the libgit2 v0.22 case, you can use
+
+    import "gopkg.in/libgit2/git2go.v22"
+
+to use a version of git2go which will work against libgit2 v0.22 and dynamically link to the library.
+
+### From master
+
+The `next` branch follows libgit2's master branch, which means there is no stable API or ABI to link against. git2go can statically link against a vendored version of libgit2.
 
 Run `go get -d github.com/libgit2/git2go` to download the code and go to your `$GOPATH/src/github.com/libgit2/git2go` dir. From there, we need to build the C code and put it into the resulting go binary.
 
+    git checkout next
     git submodule update --init # get libgit2
     make install
 
@@ -25,7 +38,7 @@ libgit2 uses OpenSSL and LibSSH2 for performing encrypted network connections. F
 Running the tests
 -----------------
 
-Similarly to installing, running the tests requires linking against the local libgit2 library, so the Makefile provides a wrapper
+For the stable version, `go test` will work as usual. For the `next` branch, similarly to installing, running the tests requires linking against the local libgit2 library, so the Makefile provides a wrapper
 
     make test
 

branch.go

@@ -30,10 +30,7 @@ type BranchIterator struct {
 	repo *Repository
 }
 
-type BranchInfo struct {
-	Branch *Branch
-	Type   BranchType
-}
+type BranchIteratorFunc func(*Branch, BranchType) error
 
 func newBranchIteratorFromC(repo *Repository, ptr *C.git_branch_iterator) *BranchIterator {
 	i := &BranchIterator{repo: repo, ptr: ptr}
@@ -65,8 +62,20 @@ func (i *BranchIterator) Free() {
 	C.git_branch_iterator_free(i.ptr)
 }
 
-func (repo *Repository) NewBranchIterator(flags BranchType) (*BranchIterator, error) {
+func (i *BranchIterator) ForEach(f BranchIteratorFunc) error {
+	b, t, err := i.Next()
 
+	for err == nil {
+		err = f(b, t)
+		if err == nil {
+			b, t, err = i.Next()
+		}
+	}
+
+	return err
+}
+
+func (repo *Repository) NewBranchIterator(flags BranchType) (*BranchIterator, error) {
 	refType := C.git_branch_t(flags)
 	var ptr *C.git_branch_iterator
 
@@ -87,7 +96,10 @@ func (repo *Repository) CreateBranch(branchName string, target *Commit, force bo
 	cBranchName := C.CString(branchName)
 	cForce := cbool(force)
 
-	cSignature := signature.toC()
+	cSignature, err := signature.toC()
+	if err != nil {
+		return nil, err
+	}
 	defer C.git_signature_free(cSignature)
 
 	var cmsg *C.char
@@ -124,7 +136,10 @@ func (b *Branch) Move(newBranchName string, force bool, signature *Signature, ms
 	cNewBranchName := C.CString(newBranchName)
 	cForce := cbool(force)
 
-	cSignature := signature.toC()
+	cSignature, err := signature.toC()
+	if err != nil {
+		return nil, err
+	}
 	defer C.git_signature_free(cSignature)
 
 	var cmsg *C.char

branch_test.go

@@ -1,11 +1,8 @@
 package git
 
-import (
-	"testing"
-)
+import "testing"
 
 func TestBranchIterator(t *testing.T) {
-
 	repo := createTestRepo(t)
 	seedTestRepo(t, repo)
 
@@ -24,3 +21,35 @@ func TestBranchIterator(t *testing.T) {
 		t.Fatal("expected iterover")
 	}
 }
+
+func TestBranchIteratorEach(t *testing.T) {
+	repo := createTestRepo(t)
+	seedTestRepo(t, repo)
+
+	i, err := repo.NewBranchIterator(BranchLocal)
+	checkFatal(t, err)
+
+	var names []string
+	f := func(b *Branch, t BranchType) error {
+		name, err := b.Name()
+		if err != nil {
+			return err
+		}
+
+		names = append(names, name)
+		return nil
+	}
+
+	err = i.ForEach(f)
+	if err != nil && !IsErrorCode(err, ErrIterOver) {
+		t.Fatal(err)
+	}
+
+	if len(names) != 1 {
+		t.Fatalf("expect 1 branch, but it was %d\n", len(names))
+	}
+
+	if names[0] != "master" {
+		t.Fatalf("expect branch master, but it was %s\n", names[0])
+	}
+}

checkout.go

@@ -7,6 +7,7 @@ import "C"
 import (
 	"os"
 	"runtime"
+	"unsafe"
 )
 
 type CheckoutStrategy uint
@@ -19,10 +20,10 @@ const (
 	CheckoutAllowConflicts            CheckoutStrategy = C.GIT_CHECKOUT_ALLOW_CONFLICTS              // Allow checkout to make safe updates even if conflicts are found
 	CheckoutRemoveUntracked           CheckoutStrategy = C.GIT_CHECKOUT_REMOVE_UNTRACKED             // Remove untracked files not in index (that are not ignored)
 	CheckoutRemoveIgnored             CheckoutStrategy = C.GIT_CHECKOUT_REMOVE_IGNORED               // Remove ignored files not in index
-	CheckotUpdateOnly                 CheckoutStrategy = C.GIT_CHECKOUT_UPDATE_ONLY                  // Only update existing files, don't create new ones
+	CheckoutUpdateOnly                CheckoutStrategy = C.GIT_CHECKOUT_UPDATE_ONLY                  // Only update existing files, don't create new ones
 	CheckoutDontUpdateIndex           CheckoutStrategy = C.GIT_CHECKOUT_DONT_UPDATE_INDEX            // Normally checkout updates index entries as it goes; this stops that
 	CheckoutNoRefresh                 CheckoutStrategy = C.GIT_CHECKOUT_NO_REFRESH                   // Don't refresh index/config/etc before doing checkout
-	CheckooutDisablePathspecMatch     CheckoutStrategy = C.GIT_CHECKOUT_DISABLE_PATHSPEC_MATCH       // Treat pathspec as simple list of exact match file paths
+	CheckoutDisablePathspecMatch      CheckoutStrategy = C.GIT_CHECKOUT_DISABLE_PATHSPEC_MATCH       // Treat pathspec as simple list of exact match file paths
 	CheckoutSkipUnmerged              CheckoutStrategy = C.GIT_CHECKOUT_SKIP_UNMERGED                // Allow checkout to skip unmerged files (NOT IMPLEMENTED)
 	CheckoutUserOurs                  CheckoutStrategy = C.GIT_CHECKOUT_USE_OURS                     // For unmerged files, checkout stage 2 from index (NOT IMPLEMENTED)
 	CheckoutUseTheirs                 CheckoutStrategy = C.GIT_CHECKOUT_USE_THEIRS                   // For unmerged files, checkout stage 3 from index (NOT IMPLEMENTED)
@@ -36,6 +37,20 @@ type CheckoutOpts struct {
 	DirMode         os.FileMode      // Default is 0755
 	FileMode        os.FileMode      // Default is 0644 or 0755 as dictated by blob
 	FileOpenFlags   int              // Default is O_CREAT | O_TRUNC | O_WRONLY
+	TargetDirectory string           // Alternative checkout path to workdir
+}
+
+func checkoutOptionsFromC(c *C.git_checkout_options) CheckoutOpts {
+	opts := CheckoutOpts{}
+	opts.Strategy = CheckoutStrategy(c.checkout_strategy)
+	opts.DisableFilters = c.disable_filters != 0
+	opts.DirMode = os.FileMode(c.dir_mode)
+	opts.FileMode = os.FileMode(c.file_mode)
+	opts.FileOpenFlags = int(c.file_open_flags)
+	if c.target_directory != nil {
+		opts.TargetDirectory = C.GoString(c.target_directory)
+	}
+	return opts
 }
 
 func (opts *CheckoutOpts) toC() *C.git_checkout_options {
@@ -60,17 +75,29 @@ func populateCheckoutOpts(ptr *C.git_checkout_options, opts *CheckoutOpts) *C.gi
 	ptr.disable_filters = cbool(opts.DisableFilters)
 	ptr.dir_mode = C.uint(opts.DirMode.Perm())
 	ptr.file_mode = C.uint(opts.FileMode.Perm())
-
+	if opts.TargetDirectory != "" {
+		ptr.target_directory = C.CString(opts.TargetDirectory)
+	}
 	return ptr
 }
 
+func freeCheckoutOpts(ptr *C.git_checkout_options) {
+	if ptr == nil {
+		return
+	}
+	C.free(unsafe.Pointer(ptr.target_directory))
+}
+
 // Updates files in the index and the working tree to match the content of
 // the commit pointed at by HEAD. opts may be nil.
 func (v *Repository) CheckoutHead(opts *CheckoutOpts) error {
 	runtime.LockOSThread()
 	defer runtime.UnlockOSThread()
 
-	ret := C.git_checkout_head(v.ptr, opts.toC())
+	cOpts := opts.toC()
+	defer freeCheckoutOpts(cOpts)
+
+	ret := C.git_checkout_head(v.ptr, cOpts)
 	if ret < 0 {
 		return MakeGitError(ret)
 	}
@@ -90,7 +117,10 @@ func (v *Repository) CheckoutIndex(index *Index, opts *CheckoutOpts) error {
 	runtime.LockOSThread()
 	defer runtime.UnlockOSThread()
 
-	ret := C.git_checkout_index(v.ptr, iptr, opts.toC())
+	cOpts := opts.toC()
+	defer freeCheckoutOpts(cOpts)
+
+	ret := C.git_checkout_index(v.ptr, iptr, cOpts)
 	if ret < 0 {
 		return MakeGitError(ret)
 	}
@@ -102,7 +132,10 @@ func (v *Repository) CheckoutTree(tree *Tree, opts *CheckoutOpts) error {
 	runtime.LockOSThread()
 	defer runtime.UnlockOSThread()
 
-	ret := C.git_checkout_tree(v.ptr, tree.ptr, opts.toC())
+	cOpts := opts.toC()
+	defer freeCheckoutOpts(cOpts)
+
+	ret := C.git_checkout_tree(v.ptr, tree.ptr, cOpts)
 	if ret < 0 {
 		return MakeGitError(ret)
 	}

cherrypick.go

@@ -0,0 +1,73 @@
+package git
+
+/*
+#include <git2.h>
+*/
+import "C"
+import (
+	"runtime"
+)
+
+type CherrypickOptions struct {
+	Version      uint
+	Mainline     uint
+	MergeOpts    MergeOptions
+	CheckoutOpts CheckoutOpts
+}
+
+func cherrypickOptionsFromC(c *C.git_cherrypick_options) CherrypickOptions {
+	opts := CherrypickOptions{
+		Version:      uint(c.version),
+		Mainline:     uint(c.mainline),
+		MergeOpts:    mergeOptionsFromC(&c.merge_opts),
+		CheckoutOpts: checkoutOptionsFromC(&c.checkout_opts),
+	}
+	return opts
+}
+
+func (opts *CherrypickOptions) toC() *C.git_cherrypick_options {
+	if opts == nil {
+		return nil
+	}
+	c := C.git_cherrypick_options{}
+	c.version = C.uint(opts.Version)
+	c.mainline = C.uint(opts.Mainline)
+	c.merge_opts = *opts.MergeOpts.toC()
+	c.checkout_opts = *opts.CheckoutOpts.toC()
+	return &c
+}
+
+func freeCherrypickOpts(ptr *C.git_cherrypick_options) {
+	if ptr == nil {
+		return
+	}
+	freeCheckoutOpts(&ptr.checkout_opts)
+}
+
+func DefaultCherrypickOptions() (CherrypickOptions, error) {
+	c := C.git_cherrypick_options{}
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ecode := C.git_cherrypick_init_options(&c, C.GIT_CHERRYPICK_OPTIONS_VERSION)
+	if ecode < 0 {
+		return CherrypickOptions{}, MakeGitError(ecode)
+	}
+	defer freeCherrypickOpts(&c)
+	return cherrypickOptionsFromC(&c), nil
+}
+
+func (v *Repository) Cherrypick(commit *Commit, opts CherrypickOptions) error {
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	cOpts := opts.toC()
+	defer freeCherrypickOpts(cOpts)
+
+	ecode := C.git_cherrypick(v.ptr, commit.cast_ptr, cOpts)
+	if ecode < 0 {
+		return MakeGitError(ecode)
+	}
+	return nil
+}

cherrypick_test.go

@@ -0,0 +1,83 @@
+package git
+
+import (
+	"io/ioutil"
+	"testing"
+)
+
+func checkout(t *testing.T, repo *Repository, commit *Commit) {
+	tree, err := commit.Tree()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = repo.CheckoutTree(tree, &CheckoutOpts{Strategy: CheckoutSafe})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = repo.SetHeadDetached(commit.Id(), commit.Author(), "checkout")
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
+const content = "Herro, Worrd!"
+
+func readReadme(t *testing.T, repo *Repository) string {
+	bytes, err := ioutil.ReadFile(pathInRepo(repo, "README"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	return string(bytes)
+}
+
+func TestCherrypick(t *testing.T) {
+	repo := createTestRepo(t)
+	c1, _ := seedTestRepo(t, repo)
+	c2, _ := updateReadme(t, repo, content)
+
+	commit1, err := repo.LookupCommit(c1)
+	if err != nil {
+		t.Fatal(err)
+	}
+	commit2, err := repo.LookupCommit(c2)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	checkout(t, repo, commit1)
+
+	if readReadme(t, repo) == content {
+		t.Fatalf("README has wrong content after checking out initial commit")
+	}
+
+	opts, err := DefaultCherrypickOptions()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = repo.Cherrypick(commit2, opts)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if readReadme(t, repo) != content {
+		t.Fatalf("README has wrong contents after cherry-picking")
+	}
+
+	state := repo.State()
+	if state != RepositoryStateCherrypick {
+		t.Fatal("Incorrect repository state: ", state)
+	}
+
+	err = repo.StateCleanup()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	state = repo.State()
+	if state != RepositoryStateNone {
+		t.Fatal("Incorrect repository state: ", state)
+	}
+}

clone.go

@@ -30,6 +30,7 @@ func Clone(url string, path string, options *CloneOptions) (*Repository, error)
 
 	var copts C.git_clone_options
 	populateCloneOptions(&copts, options)
+	defer freeCheckoutOpts(&copts.checkout_opts)
 
 	if len(options.CheckoutBranch) != 0 {
 		copts.checkout_branch = C.CString(options.CheckoutBranch)

commit.go

@@ -9,8 +9,6 @@ import "C"
 
 import (
 	"runtime"
-	"time"
-	"unsafe"
 )
 
 // Commit
@@ -23,6 +21,10 @@ func (c Commit) Message() string {
 	return C.GoString(C.git_commit_message(c.cast_ptr))
 }
 
+func (c Commit) Summary() string {
+	return C.GoString(C.git_commit_summary(c.cast_ptr))
+}
+
 func (c Commit) Tree() (*Tree, error) {
 	var ptr *C.git_tree
 
@@ -68,49 +70,3 @@ func (c *Commit) ParentId(n uint) *Oid {
 func (c *Commit) ParentCount() uint {
 	return uint(C.git_commit_parentcount(c.cast_ptr))
 }
-
-// Signature
-
-type Signature struct {
-	Name  string
-	Email string
-	When  time.Time
-}
-
-func newSignatureFromC(sig *C.git_signature) *Signature {
-	// git stores minutes, go wants seconds
-	loc := time.FixedZone("", int(sig.when.offset)*60)
-	return &Signature{
-		C.GoString(sig.name),
-		C.GoString(sig.email),
-		time.Unix(int64(sig.when.time), 0).In(loc),
-	}
-}
-
-// the offset in mintes, which is what git wants
-func (v *Signature) Offset() int {
-	_, offset := v.When.Zone()
-	return offset / 60
-}
-
-func (sig *Signature) toC() *C.git_signature {
-
-	if sig == nil {
-		return nil
-	}
-
-	var out *C.git_signature
-
-	name := C.CString(sig.Name)
-	defer C.free(unsafe.Pointer(name))
-
-	email := C.CString(sig.Email)
-	defer C.free(unsafe.Pointer(email))
-
-	ret := C.git_signature_new(&out, name, email, C.git_time_t(sig.When.Unix()), C.int(sig.Offset()))
-	if ret < 0 {
-		return nil
-	}
-
-	return out
-}

config.go

@@ -74,7 +74,6 @@ func (c *Config) AddFile(path string, level ConfigLevel, force bool) error {
 	runtime.LockOSThread()
 	defer runtime.UnlockOSThread()
 
-
 	ret := C.git_config_add_file_ondisk(c.ptr, cpath, C.git_config_level_t(level), cbool(force))
 	if ret < 0 {
 		return MakeGitError(ret)
@@ -130,7 +129,6 @@ func (c *Config) LookupString(name string) (string, error) {
 	return C.GoString(ptr), nil
 }
 
-
 func (c *Config) LookupBool(name string) (bool, error) {
 	var out C.int
 	cname := C.CString(name)
@@ -234,7 +232,6 @@ func (c *Config) SetInt32(name string, value int32) (err error) {
 	cname := C.CString(name)
 	defer C.free(unsafe.Pointer(cname))
 
-
 	runtime.LockOSThread()
 	defer runtime.UnlockOSThread()
 
@@ -368,3 +365,48 @@ func (iter *ConfigIterator) Free() {
 	runtime.SetFinalizer(iter, nil)
 	C.free(unsafe.Pointer(iter.ptr))
 }
+
+func ConfigFindGlobal() (string, error) {
+	var buf C.git_buf
+	defer C.git_buf_free(&buf)
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_config_find_global(&buf)
+	if ret < 0 {
+		return "", MakeGitError(ret)
+	}
+
+	return C.GoString(buf.ptr), nil
+}
+
+func ConfigFindSystem() (string, error) {
+	var buf C.git_buf
+	defer C.git_buf_free(&buf)
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_config_find_system(&buf)
+	if ret < 0 {
+		return "", MakeGitError(ret)
+	}
+
+	return C.GoString(buf.ptr), nil
+}
+
+func ConfigFindXDG() (string, error) {
+	var buf C.git_buf
+	defer C.git_buf_free(&buf)
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_config_find_xdg(&buf)
+	if ret < 0 {
+		return "", MakeGitError(ret)
+	}
+
+	return C.GoString(buf.ptr), nil
+}

git_test.go

@@ -57,6 +57,10 @@ func seedTestRepo(t *testing.T, repo *Repository) (*Oid, *Oid) {
 	return commitId, treeId
 }
 
+func pathInRepo(repo *Repository, name string) string {
+	return path.Join(path.Dir(path.Dir(repo.Path())), name)
+}
+
 func updateReadme(t *testing.T, repo *Repository, content string) (*Oid, *Oid) {
 	loc, err := time.LoadLocation("Europe/Berlin")
 	checkFatal(t, err)
@@ -67,7 +71,7 @@ func updateReadme(t *testing.T, repo *Repository, content string) (*Oid, *Oid) {
 	}
 
 	tmpfile := "README"
-	err = ioutil.WriteFile(path.Join(path.Dir(path.Dir(repo.Path())), tmpfile), []byte(content), 0644)
+	err = ioutil.WriteFile(pathInRepo(repo, tmpfile), []byte(content), 0644)
 	checkFatal(t, err)
 
 	idx, err := repo.Index()

graph.go

@@ -0,0 +1,36 @@
+package git
+
+/*
+#include <git2.h>
+*/
+import "C"
+import (
+	"runtime"
+)
+
+func (repo *Repository) DescendantOf(commit, ancestor *Oid) (bool, error) {
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_graph_descendant_of(repo.ptr, commit.toC(), ancestor.toC())
+	if ret < 0 {
+		return false, MakeGitError(ret)
+	}
+
+	return (ret > 0), nil
+}
+
+func (repo *Repository) AheadBehind(local, upstream *Oid) (ahead, behind int, err error) {
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	var aheadT C.size_t
+	var behindT C.size_t
+
+	ret := C.git_graph_ahead_behind(&aheadT, &behindT, repo.ptr, local.toC(), upstream.toC())
+	if ret < 0 {
+		return 0, 0, MakeGitError(ret)
+	}
+
+	return int(aheadT), int(behindT), nil
+}

merge.go

@@ -145,6 +145,7 @@ func (r *Repository) Merge(theirHeads []*AnnotatedCommit, mergeOptions *MergeOpt
 
 	cMergeOpts := mergeOptions.toC()
 	cCheckoutOpts := checkoutOptions.toC()
+	defer freeCheckoutOpts(cCheckoutOpts)
 
 	gmerge_head_array := make([]*C.git_annotated_commit, len(theirHeads))
 	for i := 0; i < len(theirHeads); i++ {

object.go

@@ -29,8 +29,8 @@ type gitObject struct {
 	repo *Repository
 }
 
-func (t ObjectType) String() (string) {
-	switch (t) {
+func (t ObjectType) String() string {
+	switch t {
 	case ObjectAny:
 		return "Any"
 	case ObjectBad:

odb.go

@@ -111,7 +111,7 @@ func odbForEachCb(id *C.git_oid, payload unsafe.Pointer) int {
 }
 
 func (v *Odb) ForEach(callback OdbForEachCallback) error {
-	data := foreachData {
+	data := foreachData{
 		callback: callback,
 		err:      nil,
 	}
@@ -138,7 +138,7 @@ func (v *Odb) Hash(data []byte, otype ObjectType) (oid *Oid, err error) {
 	runtime.LockOSThread()
 	defer runtime.UnlockOSThread()
 
-	ret := C.git_odb_hash(oid.toC(), ptr, C.size_t(header.Len), C.git_otype(otype));
+	ret := C.git_odb_hash(oid.toC(), ptr, C.size_t(header.Len), C.git_otype(otype))
 	if ret < 0 {
 		return nil, MakeGitError(ret)
 	}

odb_test.go

@@ -1,9 +1,9 @@
 package git
 
 import (
+	"errors"
 	"io"
 	"os"
-	"errors"
 	"testing"
 )
 

patch_test.go

@@ -20,7 +20,11 @@ func TestPatch(t *testing.T) {
 	newTree, err := repo.LookupTree(newTreeId)
 	checkFatal(t, err)
 
-	diff, err := repo.DiffTreeToTree(originalTree, newTree, nil)
+	opts := &DiffOptions{
+		OldPrefix: "a",
+		NewPrefix: "b",
+	}
+	diff, err := repo.DiffTreeToTree(originalTree, newTree, opts)
 	checkFatal(t, err)
 
 	patch, err := diff.Patch(0)

reference.go

@@ -36,7 +36,10 @@ func (v *Reference) SetSymbolicTarget(target string, sig *Signature, msg string)
 	runtime.LockOSThread()
 	defer runtime.UnlockOSThread()
 
-	csig := sig.toC()
+	csig, err := sig.toC()
+	if err != nil {
+		return nil, err
+	}
 	defer C.free(unsafe.Pointer(csig))
 
 	var cmsg *C.char
@@ -61,7 +64,10 @@ func (v *Reference) SetTarget(target *Oid, sig *Signature, msg string) (*Referen
 	runtime.LockOSThread()
 	defer runtime.UnlockOSThread()
 
-	csig := sig.toC()
+	csig, err := sig.toC()
+	if err != nil {
+		return nil, err
+	}
 	defer C.free(unsafe.Pointer(csig))
 
 	var cmsg *C.char
@@ -99,7 +105,10 @@ func (v *Reference) Rename(name string, force bool, sig *Signature, msg string)
 	cname := C.CString(name)
 	defer C.free(unsafe.Pointer(cname))
 
-	csig := sig.toC()
+	csig, err := sig.toC()
+	if err != nil {
+		return nil, err
+	}
 	defer C.free(unsafe.Pointer(csig))
 
 	var cmsg *C.char

remote.go

@@ -604,7 +604,10 @@ func (o *Remote) Fetch(refspecs []string, sig *Signature, msg string) error {
 
 	var csig *C.git_signature = nil
 	if sig != nil {
-		csig = sig.toC()
+		csig, err := sig.toC()
+		if err != nil {
+			return err
+		}
 		defer C.free(unsafe.Pointer(csig))
 	}
 
@@ -696,7 +699,10 @@ func (o *Remote) Ls(filterRefs ...string) ([]RemoteHead, error) {
 func (o *Remote) Push(refspecs []string, opts *PushOptions, sig *Signature, msg string) error {
 	var csig *C.git_signature = nil
 	if sig != nil {
-		csig = sig.toC()
+		csig, err := sig.toC()
+		if err != nil {
+			return err
+		}
 		defer C.free(unsafe.Pointer(csig))
 	}
 

repository.go

@@ -210,7 +210,10 @@ func (v *Repository) SetHead(refname string, sig *Signature, msg string) error {
 	cname := C.CString(refname)
 	defer C.free(unsafe.Pointer(cname))
 
-	csig := sig.toC()
+	csig, err := sig.toC()
+	if err != nil {
+		return err
+	}
 	defer C.free(unsafe.Pointer(csig))
 
 	var cmsg *C.char
@@ -230,7 +233,10 @@ func (v *Repository) SetHead(refname string, sig *Signature, msg string) error {
 }
 
 func (v *Repository) SetHeadDetached(id *Oid, sig *Signature, msg string) error {
-	csig := sig.toC()
+	csig, err := sig.toC()
+	if err != nil {
+		return err
+	}
 	defer C.free(unsafe.Pointer(csig))
 
 	var cmsg *C.char
@@ -253,7 +259,10 @@ func (v *Repository) CreateReference(name string, id *Oid, force bool, sig *Sign
 	cname := C.CString(name)
 	defer C.free(unsafe.Pointer(cname))
 
-	csig := sig.toC()
+	csig, err := sig.toC()
+	if err != nil {
+		return nil, err
+	}
 	defer C.free(unsafe.Pointer(csig))
 
 	var cmsg *C.char
@@ -284,7 +293,10 @@ func (v *Repository) CreateSymbolicReference(name, target string, force bool, si
 	ctarget := C.CString(target)
 	defer C.free(unsafe.Pointer(ctarget))
 
-	csig := sig.toC()
+	csig, err := sig.toC()
+	if err != nil {
+		return nil, err
+	}
 	defer C.free(unsafe.Pointer(csig))
 
 	var cmsg *C.char
@@ -352,10 +364,16 @@ func (v *Repository) CreateCommit(
 		parentsarg = &cparents[0]
 	}
 
-	authorSig := author.toC()
+	authorSig, err := author.toC()
+	if err != nil {
+		return nil, err
+	}
 	defer C.git_signature_free(authorSig)
 
-	committerSig := committer.toC()
+	committerSig, err := committer.toC()
+	if err != nil {
+		return nil, err
+	}
 	defer C.git_signature_free(committerSig)
 
 	runtime.LockOSThread()
@@ -384,7 +402,10 @@ func (v *Repository) CreateTag(
 	cmessage := C.CString(message)
 	defer C.free(unsafe.Pointer(cmessage))
 
-	taggerSig := tagger.toC()
+	taggerSig, err := tagger.toC()
+	if err != nil {
+		return nil, err
+	}
 	defer C.git_signature_free(taggerSig)
 
 	ctarget := commit.gitObject.ptr
@@ -546,10 +567,16 @@ func (v *Repository) CreateNote(
 		defer C.free(unsafe.Pointer(cref))
 	}
 
-	authorSig := author.toC()
+	authorSig, err := author.toC()
+	if err != nil {
+		return nil, err
+	}
 	defer C.git_signature_free(authorSig)
 
-	committerSig := committer.toC()
+	committerSig, err := committer.toC()
+	if err != nil {
+		return nil, err
+	}
 	defer C.git_signature_free(committerSig)
 
 	cnote := C.CString(note)
@@ -601,10 +628,16 @@ func (v *Repository) RemoveNote(ref string, author, committer *Signature, id *Oi
 		defer C.free(unsafe.Pointer(cref))
 	}
 
-	authorSig := author.toC()
+	authorSig, err := author.toC()
+	if err != nil {
+		return err
+	}
 	defer C.git_signature_free(authorSig)
 
-	committerSig := committer.toC()
+	committerSig, err := committer.toC()
+	if err != nil {
+		return err
+	}
 	defer C.git_signature_free(committerSig)
 
 	runtime.LockOSThread()
@@ -630,3 +663,36 @@ func (v *Repository) DefaultNoteRef() (string, error) {
 
 	return C.GoString(ptr), nil
 }
+
+type RepositoryState int
+
+const (
+	RepositoryStateNone                 RepositoryState = C.GIT_REPOSITORY_STATE_NONE
+	RepositoryStateMerge                RepositoryState = C.GIT_REPOSITORY_STATE_MERGE
+	RepositoryStateRevert               RepositoryState = C.GIT_REPOSITORY_STATE_REVERT
+	RepositoryStateCherrypick           RepositoryState = C.GIT_REPOSITORY_STATE_CHERRYPICK
+	RepositoryStateBisect               RepositoryState = C.GIT_REPOSITORY_STATE_BISECT
+	RepositoryStateRebase               RepositoryState = C.GIT_REPOSITORY_STATE_REBASE
+	RepositoryStateRebaseInteractive    RepositoryState = C.GIT_REPOSITORY_STATE_REBASE_INTERACTIVE
+	RepositoryStateRebaseMerge          RepositoryState = C.GIT_REPOSITORY_STATE_REBASE_MERGE
+	RepositoryStateApplyMailbox         RepositoryState = C.GIT_REPOSITORY_STATE_APPLY_MAILBOX
+	RepositoryStateApplyMailboxOrRebase RepositoryState = C.GIT_REPOSITORY_STATE_APPLY_MAILBOX_OR_REBASE
+)
+
+func (r *Repository) State() RepositoryState {
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	return RepositoryState(C.git_repository_state(r.ptr))
+}
+
+func (r *Repository) StateCleanup() error {
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	cErr := C.git_repository_state_cleanup(r.ptr)
+	if cErr < 0 {
+		return MakeGitError(cErr)
+	}
+	return nil
+}

signature.go

@@ -0,0 +1,73 @@
+package git
+
+/*
+#include <git2.h>
+*/
+import "C"
+import (
+	"runtime"
+	"time"
+	"unsafe"
+)
+
+type Signature struct {
+	Name  string
+	Email string
+	When  time.Time
+}
+
+func newSignatureFromC(sig *C.git_signature) *Signature {
+	// git stores minutes, go wants seconds
+	loc := time.FixedZone("", int(sig.when.offset)*60)
+	return &Signature{
+		C.GoString(sig.name),
+		C.GoString(sig.email),
+		time.Unix(int64(sig.when.time), 0).In(loc),
+	}
+}
+
+// the offset in mintes, which is what git wants
+func (v *Signature) Offset() int {
+	_, offset := v.When.Zone()
+	return offset / 60
+}
+
+func (sig *Signature) toC() (*C.git_signature, error) {
+	if sig == nil {
+		return nil, nil
+	}
+
+	var out *C.git_signature
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	name := C.CString(sig.Name)
+	defer C.free(unsafe.Pointer(name))
+
+	email := C.CString(sig.Email)
+	defer C.free(unsafe.Pointer(email))
+
+	ret := C.git_signature_new(&out, name, email, C.git_time_t(sig.When.Unix()), C.int(sig.Offset()))
+	if ret < 0 {
+		return nil, MakeGitError(ret)
+	}
+
+	return out, nil
+}
+
+func (repo *Repository) DefaultSignature() (*Signature, error) {
+	var out *C.git_signature
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	cErr := C.git_signature_default(&out, repo.ptr)
+	if cErr < 0 {
+		return nil, MakeGitError(cErr)
+	}
+
+	defer C.git_signature_free(out)
+
+	return newSignatureFromC(out), nil
+}

status.go

@@ -45,7 +45,7 @@ func statusEntryFromC(statusEntry *C.git_status_entry) StatusEntry {
 		indexToWorkdir = diffDeltaFromC(statusEntry.index_to_workdir)
 	}
 
-	return StatusEntry {
+	return StatusEntry{
 		Status:         Status(statusEntry.status),
 		HeadToIndex:    headToIndex,
 		IndexToWorkdir: indexToWorkdir,
@@ -173,7 +173,6 @@ func (v *Repository) StatusList(opts *StatusOptions) (*StatusList, error) {
 	return newStatusListFromC(ptr), nil
 }
 
-
 func (v *Repository) StatusFile(path string) (Status, error) {
 	var statusFlags C.uint
 	cPath := C.CString(path)

status_test.go

@@ -12,6 +12,11 @@ func TestStatusFile(t *testing.T) {
 	defer repo.Free()
 	defer os.RemoveAll(repo.Workdir())
 
+	state := repo.State()
+	if state != RepositoryStateNone {
+		t.Fatal("Incorrect repository state: ", state)
+	}
+
 	err := ioutil.WriteFile(path.Join(path.Dir(repo.Workdir()), "hello.txt"), []byte("Hello, World"), 0644)
 	checkFatal(t, err)
 

submodule.go

@@ -97,10 +97,10 @@ func (repo *Repository) LookupSubmodule(name string) (*Submodule, error) {
 type SubmoduleCbk func(sub *Submodule, name string) int
 
 //export SubmoduleVisitor
-func SubmoduleVisitor(csub unsafe.Pointer, name string, cfct unsafe.Pointer) int {
+func SubmoduleVisitor(csub unsafe.Pointer, name *C.char, cfct unsafe.Pointer) C.int {
 	sub := &Submodule{(*C.git_submodule)(csub)}
 	fct := *(*SubmoduleCbk)(cfct)
-	return fct(sub, name)
+	return (C.int)(fct(sub, C.GoString(name)))
 }
 
 func (repo *Repository) ForeachSubmodule(cbk SubmoduleCbk) error {
@@ -318,7 +318,10 @@ func (repo *Repository) ReloadAllSubmodules(force bool) error {
 
 func (sub *Submodule) Update(init bool, opts *SubmoduleUpdateOptions) error {
 	var copts C.git_submodule_update_options
-	populateSubmoduleUpdateOptions(&copts, opts)
+	err := populateSubmoduleUpdateOptions(&copts, opts)
+	if err != nil {
+		return err
+	}
 
 	runtime.LockOSThread()
 	defer runtime.UnlockOSThread()
@@ -331,15 +334,22 @@ func (sub *Submodule) Update(init bool, opts *SubmoduleUpdateOptions) error {
 	return nil
 }
 
-func populateSubmoduleUpdateOptions(ptr *C.git_submodule_update_options, opts *SubmoduleUpdateOptions) {
+func populateSubmoduleUpdateOptions(ptr *C.git_submodule_update_options, opts *SubmoduleUpdateOptions) error {
 	C.git_submodule_update_init_options(ptr, C.GIT_SUBMODULE_UPDATE_OPTIONS_VERSION)
 
 	if opts == nil {
-		return
+		return nil
 	}
 
 	populateCheckoutOpts(&ptr.checkout_opts, opts.CheckoutOpts)
 	populateRemoteCallbacks(&ptr.remote_callbacks, opts.RemoteCallbacks)
 	ptr.clone_checkout_strategy = C.uint(opts.CloneCheckoutStrategy)
-	ptr.signature = opts.Signature.toC()
+
+	sig, err := opts.Signature.toC()
+	if err != nil {
+		return err
+	}
+	ptr.signature = sig
+
+	return nil
 }

submodule_test.go

@@ -0,0 +1,24 @@
+package git
+
+import (
+	"testing"
+)
+
+func TestSubmoduleForeach(t *testing.T) {
+	repo := createTestRepo(t)
+	seedTestRepo(t, repo)
+
+	_, err := repo.AddSubmodule("http://example.org/submodule", "submodule", true)
+	checkFatal(t, err)
+
+	i := 0
+	err = repo.ForeachSubmodule(func(sub *Submodule, name string) int {
+		i++
+		return 0
+	})
+	checkFatal(t, err)
+
+	if i != 1 {
+		t.Fatalf("expected one submodule found but got %i", i)
+	}
+}

tag_test.go

@@ -2,8 +2,8 @@ package git
 
 import (
 	"os"
-	"time"
 	"testing"
+	"time"
 )
 
 func TestCreateTag(t *testing.T) {