thodg/libgit2

diff --git a/include/git2/errors.h b/include/git2/errors.h
index 325d0a6..17a7010 100644
--- a/include/git2/errors.h
+++ b/include/git2/errors.h
@@ -133,6 +133,8 @@ typedef enum {
 	GITERR_INDEX,
 	GITERR_OBJECT,
 	GITERR_NET,
+	GITERR_TAG,
+	GITERR_TREE,
 } git_error_class;
 
 /**
diff --git a/src/commit.c b/src/commit.c
index 25db5c0..04f37fe 100644
--- a/src/commit.c
+++ b/src/commit.c
@@ -310,8 +310,10 @@ int git_commit_parent(git_commit **parent, git_commit *commit, unsigned int n)
 	assert(commit);
 
 	parent_oid = git_vector_get(&commit->parent_oids, n);
-	if (parent_oid == NULL)
-		return git__throw(GIT_ENOTFOUND, "Parent %u does not exist", n);
+	if (parent_oid == NULL) {
+		giterr_set(GITERR_INVALID, "Parent %u does not exist", n);
+		return GIT_ENOTFOUND;
+	}
 
 	return git_commit_lookup(parent, commit->object.repo, parent_oid);
 }
diff --git a/src/delta-apply.c b/src/delta-apply.c
index 24eba2b..c8c662f 100644
--- a/src/delta-apply.c
+++ b/src/delta-apply.c
@@ -51,11 +51,15 @@ int git__delta_apply(
 	 * if not we would underflow while accessing data from the
 	 * base object, resulting in data corruption or segfault.
 	 */
-	if ((hdr_sz(&base_sz, &delta, delta_end) < 0) || (base_sz != base_len))
-		return git__throw(GIT_ERROR, "Failed to apply delta. Base size does not match given data");
+	if ((hdr_sz(&base_sz, &delta, delta_end) < 0) || (base_sz != base_len)) {
+		giterr_set(GITERR_INVALID, "Failed to apply delta. Base size does not match given data");
+		return -1;
+	}
 
-	if (hdr_sz(&res_sz, &delta, delta_end) < 0)
-		return git__throw(GIT_ERROR, "Failed to apply delta. Base size does not match given data");
+	if (hdr_sz(&res_sz, &delta, delta_end) < 0) {
+		giterr_set(GITERR_INVALID, "Failed to apply delta. Base size does not match given data");
+		return -1;
+	}
 
 	if ((res_dp = git__malloc(res_sz + 1)) == NULL)
 		return GIT_ENOMEM;
@@ -111,5 +115,6 @@ int git__delta_apply(
 fail:
 	git__free(out->data);
 	out->data = NULL;
-	return git__throw(GIT_ERROR, "Failed to apply delta");
+	giterr_set(GITERR_INVALID, "Failed to apply delta");
+	return -1;
 }
diff --git a/src/filter.c b/src/filter.c
index 3389bed..d6c2e1c 100644
--- a/src/filter.c
+++ b/src/filter.c
@@ -95,8 +95,8 @@ int git_filters_load(git_vector *filters, git_repository *repo, const char *path
 		if (error < GIT_SUCCESS)
 			return error;
 	} else {
-		return git__throw(GIT_ENOTIMPLEMENTED,
-			"Worktree filters are not implemented yet");
+		giterr_set(GITERR_INVALID, "Worktree filters are not implemented yet");
+		return GIT_ENOTIMPLEMENTED;
 	}
 
 	return (int)filters->length;
diff --git a/src/object.c b/src/object.c
index bb27f71..979fb40 100644
--- a/src/object.c
+++ b/src/object.c
@@ -68,7 +68,8 @@ static int create_object(git_object **object_out, git_otype type)
 		break;
 
 	default:
-		return git__throw(GIT_EINVALIDTYPE, "The given type is invalid");
+		giterr_set(GITERR_INVALID, "The given type is invalid");
+		return -1;
 	}
 
 	object->type = type;
@@ -92,8 +93,7 @@ int git_object_lookup_prefix(
 	assert(repo && object_out && id);
 
 	if (len < GIT_OID_MINPREFIXLEN)
-		return git__throw(GIT_EAMBIGUOUS,
-			"Failed to lookup object. Prefix length is lower than %d.", GIT_OID_MINPREFIXLEN);
+		return GIT_EAMBIGUOUS;
 
 	error = git_repository_odb__weakptr(&odb, repo);
 	if (error < GIT_SUCCESS)
@@ -110,13 +110,12 @@ int git_object_lookup_prefix(
 		if (object != NULL) {
 			if (type != GIT_OBJ_ANY && type != object->type) {
 				git_object_free(object);
-				return git__throw(GIT_EINVALIDTYPE,
-					"Failed to lookup object. "
-					"The given type does not match the type on the ODB");
+				giterr_set(GITERR_INVALID, "The given type does not match the type in ODB");
+				return -1;
 			}
 
 			*object_out = object;
-			return GIT_SUCCESS;
+			return 0;
 		}
 
 		/* Object was not found in the cache, let's explore the backends.
@@ -147,18 +146,19 @@ int git_object_lookup_prefix(
 		error = git_odb_read_prefix(&odb_obj, odb, &short_oid, len);
 	}
 
-	if (error < GIT_SUCCESS)
-		return git__rethrow(error, "Failed to lookup object");
+	if (error < 0)
+		return -1;
 
 	if (type != GIT_OBJ_ANY && type != odb_obj->raw.type) {
 		git_odb_object_free(odb_obj);
-		return git__throw(GIT_EINVALIDTYPE, "Failed to lookup object. The given type does not match the type on the ODB");
+		giterr_set(GITERR_INVALID, "The given type does not match the type on the ODB");
+		return -1;
 	}
 
 	type = odb_obj->raw.type;
 
-	if ((error = create_object(&object, type)) < GIT_SUCCESS)
-		return git__rethrow(error, "Failed to lookup object");
+	if (create_object(&object, type) < 0)
+		return -1;
 
 	/* Initialize parent object */
 	git_oid_cpy(&object->cached.oid, &odb_obj->cached.oid);
@@ -187,13 +187,13 @@ int git_object_lookup_prefix(
 
 	git_odb_object_free(odb_obj);
 
-	if (error < GIT_SUCCESS) {
+	if (error < 0) {
 		git_object__free(object);
-		return git__rethrow(error, "Failed to lookup object");
+		return -1;
 	}
 
 	*object_out = git_cache_try_store(&repo->objects, object);
-	return GIT_SUCCESS;
+	return 0;
 }
 
 int git_object_lookup(git_object **object_out, git_repository *repo, const git_oid *id, git_otype type) {
diff --git a/src/refspec.c b/src/refspec.c
index 7a5127c..bec770a 100644
--- a/src/refspec.c
+++ b/src/refspec.c
@@ -25,24 +25,21 @@ int git_refspec_parse(git_refspec *refspec, const char *str)
 	delim = strchr(str, ':');
 	if (delim == NULL) {
 		refspec->src = git__strdup(str);
-		if (refspec->src == NULL)
-			return GIT_ENOMEM;
-
-		return GIT_SUCCESS;
+		GITERR_CHECK_ALLOC(refspec->src);
+		return 0;
 	}
 
 	refspec->src = git__strndup(str, delim - str);
-	if (refspec->src == NULL)
-		return GIT_ENOMEM;
+	GITERR_CHECK_ALLOC(refspec->src);
 
 	refspec->dst = git__strdup(delim + 1);
 	if (refspec->dst == NULL) {
 		git__free(refspec->src);
 		refspec->src = NULL;
-		return GIT_ENOMEM;
+		return -1;
 	}
 
-	return GIT_SUCCESS;
+	return 0;
 }
 
 const char *git_refspec_src(const git_refspec *refspec)
@@ -65,8 +62,10 @@ int git_refspec_transform(char *out, size_t outlen, const git_refspec *spec, con
 	size_t baselen, namelen;
 
 	baselen = strlen(spec->dst);
-	if (outlen <= baselen)
-		return git__throw(GIT_EINVALIDREFNAME, "Reference name too long");
+	if (outlen <= baselen) {
+		giterr_set(GITERR_INVALID, "Reference name too long");
+		return GIT_ESHORTBUFFER;
+	}
 
 	/*
 	 * No '*' at the end means that it's mapped to one specific local
@@ -74,7 +73,7 @@ int git_refspec_transform(char *out, size_t outlen, const git_refspec *spec, con
 	 */
 	if (spec->dst[baselen - 1] != '*') {
 		memcpy(out, spec->dst, baselen + 1); /* include '\0' */
-		return GIT_SUCCESS;
+		return 0;
 	}
 
 	/* There's a '*' at the end, so remove its length */
@@ -85,32 +84,34 @@ int git_refspec_transform(char *out, size_t outlen, const git_refspec *spec, con
 
 	namelen = strlen(name);
 
-	if (outlen <= baselen + namelen)
-		return git__throw(GIT_EINVALIDREFNAME, "Reference name too long");
+	if (outlen <= baselen + namelen) {
+		giterr_set(GITERR_INVALID, "Reference name too long");
+		return GIT_ESHORTBUFFER;
+	}
 
 	memcpy(out, spec->dst, baselen);
 	memcpy(out + baselen, name, namelen + 1);
 
-	return GIT_SUCCESS;
+	return 0;
 }
 
 int git_refspec_transform_r(git_buf *out, const git_refspec *spec, const char *name)
 {
-	if (git_buf_sets(out, spec->dst) < GIT_SUCCESS)
-		return GIT_ENOMEM;
+	if (git_buf_sets(out, spec->dst) < 0)
+		return -1;
 
 	/*
 	 * No '*' at the end means that it's mapped to one specific local
 	 * branch, so no actual transformation is needed.
 	 */
 	if (git_buf_len(out) > 0 && out->ptr[git_buf_len(out) - 1] != '*')
-		return GIT_SUCCESS;
+		return 0;
 
 	git_buf_truncate(out, git_buf_len(out) - 1); /* remove trailing '*' */
 	git_buf_puts(out, name + strlen(spec->src) - 1);
 
 	if (git_buf_oom(out))
-		return GIT_ENOMEM;
+		return -1;
 
 	return 0;
 }
diff --git a/src/tag.c b/src/tag.c
index 5524879..ff22bf7 100644
--- a/src/tag.c
+++ b/src/tag.c
@@ -61,6 +61,12 @@ const char *git_tag_message(git_tag *t)
 	return t->message;
 }
 
+static int tag_error(const char *str)
+{
+	giterr_set(GITERR_TAG, "Failed to parse tag. %s", str);
+	return -1;
+}
+
 int git_tag__parse_buffer(git_tag *tag, const char *buffer, size_t length)
 {
 	static const char *tag_types[] = {
@@ -70,18 +76,17 @@ int git_tag__parse_buffer(git_tag *tag, const char *buffer, size_t length)
 	unsigned int i;
 	size_t text_len;
 	char *search;
-	int error;
 
 	const char *buffer_end = buffer + length;
 
-	if ((error = git_oid__parse(&tag->target, &buffer, buffer_end, "object ")) < 0)
-		return git__rethrow(error, "Failed to parse tag. Object field invalid");
+	if (git_oid__parse(&tag->target, &buffer, buffer_end, "object ") < 0)
+		return tag_error("Object field invalid");
 
 	if (buffer + 5 >= buffer_end)
-		return git__throw(GIT_EOBJCORRUPTED, "Failed to parse tag. Object too short");
+		return tag_error("Object too short");
 
 	if (memcmp(buffer, "type ", 5) != 0)
-		return git__throw(GIT_EOBJCORRUPTED, "Failed to parse tag. Type field not found");
+		return tag_error("Type field not found");
 	buffer += 5;
 
 	tag->type = GIT_OBJ_BAD;
@@ -90,7 +95,7 @@ int git_tag__parse_buffer(git_tag *tag, const char *buffer, size_t length)
 		size_t type_length = strlen(tag_types[i]);
 
 		if (buffer + type_length >= buffer_end)
-			return git__throw(GIT_EOBJCORRUPTED, "Failed to parse tag. Object too short");
+			return tag_error("Object too short");
 
 		if (memcmp(buffer, tag_types[i], type_length) == 0) {
 			tag->type = i;
@@ -100,25 +105,24 @@ int git_tag__parse_buffer(git_tag *tag, const char *buffer, size_t length)
 	}
 
 	if (tag->type == GIT_OBJ_BAD)
-		return git__throw(GIT_EOBJCORRUPTED, "Failed to parse tag. Invalid object type");
+		return tag_error("Invalid object type");
 
 	if (buffer + 4 >= buffer_end)
-		return git__throw(GIT_EOBJCORRUPTED, "Failed to parse tag. Object too short");
+		return tag_error("Object too short");
 
 	if (memcmp(buffer, "tag ", 4) != 0)
-		return git__throw(GIT_EOBJCORRUPTED, "Failed to parse tag. Tag field not found");
+		return tag_error("Tag field not found");
 
 	buffer += 4;
 
 	search = memchr(buffer, '\n', buffer_end - buffer);
 	if (search == NULL)
-		return git__throw(GIT_EOBJCORRUPTED, "Failed to parse tag. Object too short");
+		return tag_error("Object too short");
 
 	text_len = search - buffer;
 
 	tag->tag_name = git__malloc(text_len + 1);
-	if (tag->tag_name == NULL)
-		return GIT_ENOMEM;
+	GITERR_CHECK_ALLOC(tag->tag_name);
 
 	memcpy(tag->tag_name, buffer, text_len);
 	tag->tag_name[text_len] = '\0';
@@ -128,27 +132,24 @@ int git_tag__parse_buffer(git_tag *tag, const char *buffer, size_t length)
 	tag->tagger = NULL;
 	if (*buffer != '\n') {
 		tag->tagger = git__malloc(sizeof(git_signature));
-		if (tag->tagger == NULL)
-			return GIT_ENOMEM;
+		GITERR_CHECK_ALLOC(tag->tagger);
 
-		if ((error = git_signature__parse(tag->tagger, &buffer, buffer_end, "tagger ", '\n') != 0)) {
-			return git__rethrow(error, "Failed to parse tag");
-		}
+		if (git_signature__parse(tag->tagger, &buffer, buffer_end, "tagger ", '\n') < 0)
+			return -1;
 	}
 
 	if( *buffer != '\n' )
-		return git__throw(GIT_EOBJCORRUPTED, "Failed to parse tag. No new line before message");
+		return tag_error("No new line before message");
 
 	text_len = buffer_end - ++buffer;
 
 	tag->message = git__malloc(text_len + 1);
-	if (tag->message == NULL)
-		return GIT_ENOMEM;
+	GITERR_CHECK_ALLOC(tag->message);
 
 	memcpy(tag->message, buffer, text_len);
 	tag->message[text_len] = '\0';
 
-	return GIT_SUCCESS;
+	return 0;
 }
 
 static int retrieve_tag_reference(
@@ -162,17 +163,28 @@ static int retrieve_tag_reference(
 
 	*tag_reference_out = NULL;
 
-	error = git_buf_joinpath(ref_name_out, GIT_REFS_TAGS_DIR, tag_name);
-	if (error < GIT_SUCCESS)
-		return git__rethrow(error, "Failed to retrieve tag reference");
+	if (git_buf_joinpath(ref_name_out, GIT_REFS_TAGS_DIR, tag_name) < 0)
+		return -1;
 
 	error = git_reference_lookup(&tag_ref, repo, ref_name_out->ptr);
 	if (error < GIT_SUCCESS)
-		return git__rethrow(error, "Failed to retrieve tag reference");
+		return error; /* Be it not foundo or corrupted */
 
 	*tag_reference_out = tag_ref;
 
-	return GIT_SUCCESS;
+	return 0;
+}
+
+static int retrieve_tag_reference_oid(
+	git_oid *oid,
+	git_buf *ref_name_out,
+	git_repository *repo,
+	const char *tag_name)
+{
+	if (git_buf_joinpath(ref_name_out, GIT_REFS_TAGS_DIR, tag_name) < 0)
+		return -1;
+
+	return git_reference_name_to_oid(oid, repo, ref_name_out->ptr);
 }
 
 static int write_tag_annotation(
@@ -183,7 +195,6 @@ static int write_tag_annotation(
 		const git_signature *tagger,
 		const char *message)
 {
-	int error = GIT_SUCCESS;
 	git_buf tag = GIT_BUF_INIT;
 	git_odb *odb;
 
@@ -194,24 +205,20 @@ static int write_tag_annotation(
 	git_buf_putc(&tag, '\n');
 	git_buf_puts(&tag, message);
 
-	if (git_buf_oom(&tag)) {
-		git_buf_free(&tag);
-		return git__throw(GIT_ENOMEM, "Not enough memory to build the tag data");
-	}
+	if (git_buf_oom(&tag))
+		goto on_error;
 
-	error = git_repository_odb__weakptr(&odb, repo);
-	if (error < GIT_SUCCESS) {
-		git_buf_free(&tag);
-		return error;
-	}
+	if (git_repository_odb__weakptr(&odb, repo) < 0)
+		goto on_error;
 
-	error = git_odb_write(oid, odb, tag.ptr, tag.size, GIT_OBJ_TAG);
-	git_buf_free(&tag);
+	if (git_odb_write(oid, odb, tag.ptr, tag.size, GIT_OBJ_TAG) < 0)
+		goto on_error;
 
-	if (error < GIT_SUCCESS)
-		return git__rethrow(error, "Failed to create tag annotation");
-
-	return error;
+	git_buf_free(&tag);
+	return 0;
+on_error:
+	git_buf_free(&tag);
+	return -1;
 }
 
 static int git_tag_create__internal(
@@ -227,51 +234,38 @@ static int git_tag_create__internal(
 	git_reference *new_ref = NULL;
 	git_buf ref_name = GIT_BUF_INIT;
 
-	int error, should_update_ref = 0;
-	const char *errmsg = "Failed to create tag";
+	int error;
 
 	assert(repo && tag_name && target);
 	assert(!create_tag_annotation || (tagger && message));
 
-	if (git_object_owner(target) != repo)
-		return git__throw(GIT_EINVALIDARGS,
-			"The given target does not belong to this repository");
+	if (git_object_owner(target) != repo) {
+		giterr_set(GITERR_INVALID, "The given target does not belong to this repository");
+		return -1;
+	}
 
-	error = retrieve_tag_reference(&new_ref, &ref_name, repo, tag_name);
+	error = retrieve_tag_reference_oid(oid, &ref_name, repo, tag_name);
 	if (error < GIT_SUCCESS && error != GIT_ENOTFOUND)
-		goto cleanup;
+		return -1;
 
 	/** Ensure the tag name doesn't conflict with an already existing
 	 *	reference unless overwriting has explictly been requested **/
-	if (new_ref != NULL) {
-		if (!allow_ref_overwrite) {
-			git_oid_cpy(oid, git_reference_oid(new_ref));
-			error = GIT_EEXISTS;
-			errmsg = "Tag already exists";
-			goto cleanup;
-		} else {
-			should_update_ref = 1;
-		}
+	if (error == 0 && !allow_ref_overwrite) {
+		git_buf_free(&ref_name);
+		giterr_set(GITERR_TAG, "Tag already exists");
+		return GIT_EEXISTS;
 	}
 
 	if (create_tag_annotation) {
-		if ((error = write_tag_annotation(oid, repo, tag_name, target, tagger, message)) < GIT_SUCCESS)
-			goto cleanup;
+		if (write_tag_annotation(oid, repo, tag_name, target, tagger, message) < 0)
+			return -1;
 	} else
 		git_oid_cpy(oid, git_object_id(target));
 
-	if (!should_update_ref)
-		error = git_reference_create_oid(&new_ref, repo, ref_name.ptr, oid, 0);
-	else
-		error = git_reference_set_oid(new_ref, oid);
+	error = git_reference_create_oid(&new_ref, repo, ref_name.ptr, oid, allow_ref_overwrite);
 
-cleanup:
 	git_reference_free(new_ref);
 	git_buf_free(&ref_name);
-
-	if (error < GIT_SUCCESS)
-		git__rethrow(error, "%s", errmsg);
-
 	return error;
 }
 
@@ -300,8 +294,7 @@ int git_tag_create_lightweight(
 int git_tag_create_frombuffer(git_oid *oid, git_repository *repo, const char *buffer, int allow_ref_overwrite)
 {
 	git_tag tag;
-	int error, should_update_ref = 0;
-	const char *errmsg = "Failed to create tag";
+	int error;
 	git_odb *odb;
 	git_odb_stream *stream;
 	git_odb_object *target_obj;
@@ -313,71 +306,66 @@ int git_tag_create_frombuffer(git_oid *oid, git_repository *repo, const char *bu
 
 	memset(&tag, 0, sizeof(tag));
 
-	error = git_repository_odb__weakptr(&odb, repo);
-	if (error < GIT_SUCCESS)
-		return error;
+	if (git_repository_odb__weakptr(&odb, repo) < 0)
+		return -1;
 
 	/* validate the buffer */
-	if ((error = git_tag__parse_buffer(&tag, buffer, strlen(buffer))) < GIT_SUCCESS)
-		goto cleanup;
+	if (git_tag__parse_buffer(&tag, buffer, strlen(buffer)) < 0)
+		return -1;
 
 	/* validate the target */
-	if ((error = git_odb_read(&target_obj, odb, &tag.target)) < GIT_SUCCESS)
-		goto cleanup;
+	if (git_odb_read(&target_obj, odb, &tag.target) < 0)
+		goto on_error;
 
 	if (tag.type != target_obj->raw.type) {
-		error = GIT_EINVALIDTYPE;
-		errmsg = "The type for the given target is invalid";
-		goto cleanup;
+		giterr_set(GITERR_TAG, "The type for the given target is invalid");
+		goto on_error;
 	}
 
-	git_odb_object_free(target_obj);
-
-	error = retrieve_tag_reference(&new_ref, &ref_name, repo, tag.tag_name);
+	error = retrieve_tag_reference_oid(oid, &ref_name, repo, tag.tag_name);
 	if (error < GIT_SUCCESS && error != GIT_ENOTFOUND)
-		goto cleanup;
+		goto on_error;
+
+	/* We don't need these objects after this */
+	git_signature_free(tag.tagger);
+	git__free(tag.tag_name);
+	git__free(tag.message);
+	git_odb_object_free(target_obj);
 
 	/** Ensure the tag name doesn't conflict with an already existing
 	 *	reference unless overwriting has explictly been requested **/
-	if (new_ref != NULL) {
-		if (!allow_ref_overwrite) {
-			git_oid_cpy(oid, git_reference_oid(new_ref));
-			error = GIT_EEXISTS;
-			errmsg = "Tag already exists";
-			goto cleanup;
-		} else {
-			should_update_ref = 1;
-		}
+	if (error == 0 && !allow_ref_overwrite) {
+		giterr_set(GITERR_TAG, "Tag already exists");
+		return GIT_EEXISTS;
 	}
 
 	/* write the buffer */
-	if ((error = git_odb_open_wstream(&stream, odb, strlen(buffer), GIT_OBJ_TAG)) < GIT_SUCCESS)
-		goto cleanup;
+	if (git_odb_open_wstream(&stream, odb, strlen(buffer), GIT_OBJ_TAG) < 0)
+		return -1;
 
 	stream->write(stream, buffer, strlen(buffer));
 
 	error = stream->finalize_write(oid, stream);
 	stream->free(stream);
 
-	if (error < GIT_SUCCESS)
-		goto cleanup;
+	if (error < 0) {
+		git_buf_free(&ref_name);
+		return -1;
+	}
 
-	if (!should_update_ref)
-		error = git_reference_create_oid(&new_ref, repo, ref_name.ptr, oid, 0);
-	else
-		error = git_reference_set_oid(new_ref, oid);
+	error = git_reference_create_oid(&new_ref, repo, ref_name.ptr, oid, allow_ref_overwrite);
 
-cleanup:
 	git_reference_free(new_ref);
-	git_signature_free(tag.tagger);
-	git__free(tag.tag_name);
-	git__free(tag.message);
 	git_buf_free(&ref_name);
 
-	if (error < GIT_SUCCESS)
-		git__rethrow(error, "%s", errmsg);
-
 	return error;
+
+on_error:
+	git_signature_free(tag.tagger);
+	git__free(tag.tag_name);
+	git__free(tag.message);
+	git_odb_object_free(target_obj);
+	return -1;
 }
 
 int git_tag_delete(git_repository *repo, const char *tag_name)
@@ -390,8 +378,8 @@ int git_tag_delete(git_repository *repo, const char *tag_name)
 
 	git_buf_free(&ref_name);
 
-	if (error < GIT_SUCCESS)
-		return git__rethrow(error, "Failed to delete tag");
+	if (error < 0)
+		return -1;
 
 	return git_reference_delete(tag_ref);
 }
@@ -414,13 +402,13 @@ static int tag_list_cb(const char *tag_name, void *payload)
 	tag_filter_data *filter;
 
 	if (git__prefixcmp(tag_name, GIT_REFS_TAGS_DIR) != 0)
-		return GIT_SUCCESS;
+		return 0;
 
 	filter = (tag_filter_data *)payload;
 	if (!*filter->pattern || p_fnmatch(filter->pattern, tag_name + GIT_REFS_TAGS_DIR_LEN, 0) == GIT_SUCCESS)
 		return git_vector_insert(filter->taglist, git__strdup(tag_name));
 
-	return GIT_SUCCESS;
+	return 0;
 }
 
 int git_tag_list_match(git_strarray *tag_names, const char *pattern, git_repository *repo)
@@ -438,14 +426,14 @@ int git_tag_list_match(git_strarray *tag_names, const char *pattern, git_reposit
 	filter.pattern = pattern;
 
 	error = git_reference_foreach(repo, GIT_REF_OID|GIT_REF_PACKED, &tag_list_cb, (void *)&filter);
-	if (error < GIT_SUCCESS) {
+	if (error < 0) {
 		git_vector_free(&taglist);
-		return git__rethrow(error, "Failed to list tags");
+		return -1;
 	}
 
 	tag_names->strings = (char **)taglist.contents;
 	tag_names->count = taglist.length;
-	return GIT_SUCCESS;
+	return 0;
 }
 
 int git_tag_list(git_strarray *tag_names, git_repository *repo)
diff --git a/src/tree.c b/src/tree.c
index 4695573..90b054d 100644
--- a/src/tree.c
+++ b/src/tree.c
@@ -201,41 +201,38 @@ unsigned int git_tree_entrycount(git_tree *tree)
 	return tree->entries.length;
 }
 
-static int tree_parse_buffer(git_tree *tree, const char *buffer, const char *buffer_end)
+static int tree_error(const char *str)
 {
-	int error = GIT_SUCCESS;
+	giterr_set(GITERR_TREE, "%s", str);
+	return -1;
+}
 
-	if (git_vector_init(&tree->entries, DEFAULT_TREE_SIZE, entry_sort_cmp) < GIT_SUCCESS)
-		return GIT_ENOMEM;
+static int tree_parse_buffer(git_tree *tree, const char *buffer, const char *buffer_end)
+{
+	if (git_vector_init(&tree->entries, DEFAULT_TREE_SIZE, entry_sort_cmp) < 0)
+		return -1;
 
 	while (buffer < buffer_end) {
 		git_tree_entry *entry;
 		int tmp;
 
 		entry = git__calloc(1, sizeof(git_tree_entry));
-		if (entry == NULL) {
-			error = GIT_ENOMEM;
-			break;
-		}
+		GITERR_CHECK_ALLOC(entry);
 
-		if (git_vector_insert(&tree->entries, entry) < GIT_SUCCESS)
-			return GIT_ENOMEM;
+		if (git_vector_insert(&tree->entries, entry) < 0)
+			return -1;
 
-		if (git__strtol32(&tmp, buffer, &buffer, 8) < GIT_SUCCESS ||
+		if (git__strtol32(&tmp, buffer, &buffer, 8) < 0 ||
 			!buffer || !valid_attributes(tmp))
-			return git__throw(GIT_EOBJCORRUPTED, "Failed to parse tree. Can't parse attributes");
+			return tree_error("Failed to parse tree. Can't parse attributes");
 
 		entry->attr = tmp;
 
-		if (*buffer++ != ' ') {
-			error = git__throw(GIT_EOBJCORRUPTED, "Failed to parse tree. Object it corrupted");
-			break;
-		}
+		if (*buffer++ != ' ')
+			return tree_error("Failed to parse tree. Object is corrupted");
 
-		if (memchr(buffer, 0, buffer_end - buffer) == NULL) {
-			error = git__throw(GIT_EOBJCORRUPTED, "Failed to parse tree. Object it corrupted");
-			break;
-		}
+		if (memchr(buffer, 0, buffer_end - buffer) == NULL)
+			return tree_error("Failed to parse tree. Object is corrupted");
 
 		entry->filename = git__strdup(buffer);
 		entry->filename_len = strlen(buffer);
@@ -249,7 +246,7 @@ static int tree_parse_buffer(git_tree *tree, const char *buffer, const char *buf
 		buffer += GIT_OID_RAWSZ;
 	}
 
-	return error == GIT_SUCCESS ? GIT_SUCCESS : git__rethrow(error, "Failed to parse buffer");
+	return 0;
 }
 
 int git_tree__parse(git_tree *tree, git_odb_object *obj)
@@ -280,10 +277,9 @@ static int append_entry(git_treebuilder *bld, const char *filename, const git_oi
 {
 	git_tree_entry *entry;
 
-	if ((entry = git__malloc(sizeof(git_tree_entry))) == NULL)
-		return GIT_ENOMEM;
+	entry = git__calloc(1, sizeof(git_tree_entry));
+	GITERR_CHECK_ALLOC(entry);
 
-	memset(entry, 0x0, sizeof(git_tree_entry));
 	entry->filename = git__strdup(filename);
 	entry->filename_len = strlen(entry->filename);
 
@@ -291,9 +287,9 @@ static int append_entry(git_treebuilder *bld, const char *filename, const git_oi
 	entry->attr = attributes;
 
 	if (git_vector_insert(&bld->entries, entry) < 0)
-		return GIT_ENOMEM;
+		return -1;
 
-	return GIT_SUCCESS;
+	return 0;
 }
 
 static int write_tree(
@@ -318,7 +314,7 @@ static int write_tree(
 
 	error = git_treebuilder_create(&bld, NULL);
 	if (bld == NULL) {
-		return GIT_ENOMEM;
+		return -1;
 	}
 
 	/*
@@ -354,16 +350,13 @@ static int write_tree(
 			char *subdir, *last_comp;
 
 			subdir = git__strndup(entry->path, next_slash - entry->path);
-			if (subdir == NULL) {
-				error = GIT_ENOMEM;
-				goto cleanup;
-			}
+			GITERR_CHECK_ALLOC(subdir);
 
 			/* Write out the subtree */
 			written = write_tree(&sub_oid, repo, index, subdir, i);
 			if (written < 0) {
-				error = git__rethrow(written, "Failed to write subtree %s", subdir);
-				goto cleanup;
+				tree_error("Failed to write subtree");
+				goto on_error;
 			} else {
 				i = written - 1; /* -1 because of the loop increment */
 			}
@@ -382,51 +375,49 @@ static int write_tree(
 			}
 			error = append_entry(bld, last_comp, &sub_oid, S_IFDIR);
 			git__free(subdir);
-			if (error < GIT_SUCCESS) {
-				error = git__rethrow(error, "Failed to insert dir");
-				goto cleanup;
+			if (error < 0) {
+				tree_error("Failed to insert dir");
+				goto on_error;
 			}
 		} else {
 			error = append_entry(bld, filename, &entry->oid, entry->mode);
-			if (error < GIT_SUCCESS) {
-				error = git__rethrow(error, "Failed to insert file");
+			if (error < 0) {
+				tree_error("Failed to insert file");
+				goto on_error;
 			}
 		}
 	}
 
-	error = git_treebuilder_write(oid, repo, bld);
-	if (error < GIT_SUCCESS)
-		error = git__rethrow(error, "Failed to write tree to db");
+	if (git_treebuilder_write(oid, repo, bld) < 0)
+		goto on_error;
 
- cleanup:
 	git_treebuilder_free(bld);
+	return i;
 
-	if (error < GIT_SUCCESS)
-		return error;
-	else
-		return i;
+on_error:
+	git_treebuilder_free(bld);
+	return -1;
 }
 
 int git_tree_create_fromindex(git_oid *oid, git_index *index)
 {
+	int ret;
 	git_repository *repo;
-	int error;
 
 	repo = (git_repository *)GIT_REFCOUNT_OWNER(index);
 
 	if (repo == NULL)
-		return git__throw(GIT_EBAREINDEX,
-			"Failed to create tree. "
-			"The index file is not backed up by an existing repository");
+		return tree_error("Failed to create tree. "
+		  "The index file is not backed up by an existing repository");
 
 	if (index->tree != NULL && index->tree->entries >= 0) {
 		git_oid_cpy(oid, &index->tree->oid);
-		return GIT_SUCCESS;
+		return 0;
 	}
 
 	/* The tree cache didn't help us */
-	error = write_tree(oid, repo, index, "", 0);
-	return (error < GIT_SUCCESS) ? git__rethrow(error, "Failed to create tree") : GIT_SUCCESS;
+	ret = write_tree(oid, repo, index, "", 0);
+	return ret < 0 ? ret : 0;
 }
 
 static void sort_entries(git_treebuilder *bld)
@@ -442,30 +433,29 @@ int git_treebuilder_create(git_treebuilder **builder_p, const git_tree *source)
 	assert(builder_p);
 
 	bld = git__calloc(1, sizeof(git_treebuilder));
-	if (bld == NULL)
-		return GIT_ENOMEM;
+	GITERR_CHECK_ALLOC(bld);
 
 	if (source != NULL)
 		source_entries = source->entries.length;
 
-	if (git_vector_init(&bld->entries, source_entries, entry_sort_cmp) < GIT_SUCCESS) {
-		git__free(bld);
-		return GIT_ENOMEM;
-	}
+	if (git_vector_init(&bld->entries, source_entries, entry_sort_cmp) < 0)
+		goto on_error;
 
 	if (source != NULL) {
 		for (i = 0; i < source->entries.length; ++i) {
 			git_tree_entry *entry_src = source->entries.contents[i];
 
-			if (append_entry(bld, entry_src->filename, &entry_src->oid, entry_src->attr) < 0) {
-				git_treebuilder_free(bld);
-				return GIT_ENOMEM;
-			}
+			if (append_entry(bld, entry_src->filename, &entry_src->oid, entry_src->attr) < 0)
+				goto on_error;
 		}
 	}
 
 	*builder_p = bld;
-	return GIT_SUCCESS;
+	return 0;
+
+on_error:
+	git_treebuilder_free(bld);
+	return -1;
 }
 
 int git_treebuilder_insert(git_tree_entry **entry_out, git_treebuilder *bld, const char *filename, const git_oid *id, unsigned int attributes)
@@ -476,10 +466,10 @@ int git_treebuilder_insert(git_tree_entry **entry_out, git_treebuilder *bld, con
 	assert(bld && id && filename);
 
 	if (!valid_attributes(attributes))
-		return git__throw(GIT_ERROR, "Failed to insert entry. Invalid attributes");
+		return tree_error("Failed to insert entry. Invalid attributes");
 
 	if (!valid_entry_name(filename))
-		return git__throw(GIT_ERROR, "Failed to insert entry. Invalid name for a tree entry");
+		return tree_error("Failed to insert entry. Invalid name for a tree entry");
 
 	pos = tree_key_search(&bld->entries, filename);
 
@@ -488,10 +478,9 @@ int git_treebuilder_insert(git_tree_entry **entry_out, git_treebuilder *bld, con
 		if (entry->removed)
 			entry->removed = 0;
 	} else {
-		if ((entry = git__malloc(sizeof(git_tree_entry))) == NULL)
-			return GIT_ENOMEM;
+		entry = git__calloc(1, sizeof(git_tree_entry));
+		GITERR_CHECK_ALLOC(entry);
 
-		memset(entry, 0x0, sizeof(git_tree_entry));
 		entry->filename = git__strdup(filename);
 		entry->filename_len = strlen(entry->filename);
 	}
@@ -501,13 +490,13 @@ int git_treebuilder_insert(git_tree_entry **entry_out, git_treebuilder *bld, con
 
 	if (pos == GIT_ENOTFOUND) {
 		if (git_vector_insert(&bld->entries, entry) < 0)
-			return GIT_ENOMEM;
+			return -1;
 	}
 
 	if (entry_out != NULL)
 		*entry_out = entry;
 
-	return GIT_SUCCESS;
+	return 0;
 }
 
 static git_tree_entry *treebuilder_get(git_treebuilder *bld, const char *filename)
@@ -538,16 +527,15 @@ int git_treebuilder_remove(git_treebuilder *bld, const char *filename)
 	git_tree_entry *remove_ptr = treebuilder_get(bld, filename);
 
 	if (remove_ptr == NULL || remove_ptr->removed)
-		return git__throw(GIT_ENOTFOUND, "Failed to remove entry. File isn't in the tree");
+		return tree_error("Failed to remove entry. File isn't in the tree");
 
 	remove_ptr->removed = 1;
-	return GIT_SUCCESS;
+	return 0;
 }
 
 int git_treebuilder_write(git_oid *oid, git_repository *repo, git_treebuilder *bld)
 {
 	unsigned int i;
-	int error;
 	git_buf tree = GIT_BUF_INIT;
 	git_odb *odb;
 
@@ -569,21 +557,22 @@ int git_treebuilder_write(git_oid *oid, git_repository *repo, git_treebuilder *b
 		git_buf_put(&tree, (char *)entry->oid.id, GIT_OID_RAWSZ);
 	}
 
-	if (git_buf_oom(&tree)) {
-		git_buf_free(&tree);
-		return git__throw(GIT_ENOMEM, "Not enough memory to build the tree data");
-	}
+	if (git_buf_oom(&tree))
+		goto on_error;
+
+	if (git_repository_odb__weakptr(&odb, repo) < 0)
+		goto on_error;
 
-	error = git_repository_odb__weakptr(&odb, repo);
-	if (error < GIT_SUCCESS) {
-		git_buf_free(&tree);
-		return error;
-	}
 
-	error = git_odb_write(oid, odb, tree.ptr, tree.size, GIT_OBJ_TREE);
+	if (git_odb_write(oid, odb, tree.ptr, tree.size, GIT_OBJ_TREE) < 0)
+		goto on_error;
+
 	git_buf_free(&tree);
+	return 0;
 
-	return error == GIT_SUCCESS ? GIT_SUCCESS : git__rethrow(error, "Failed to write tree");
+on_error:
+	git_buf_free(&tree);
+	return -1;
 }
 
 void git_treebuilder_filter(git_treebuilder *bld, int (*filter)(const git_tree_entry *, void *), void *payload)
@@ -631,9 +620,11 @@ static int tree_frompath(
 	int error = GIT_SUCCESS;
 	git_tree *subtree;
 
-	if (!*(treeentry_path->ptr + offset))
-		return git__rethrow(GIT_EINVALIDPATH,
+	if (!*(treeentry_path->ptr + offset)) {
+		giterr_set(GITERR_INVALID,
 			"Invalid relative path to a tree entry '%s'.", treeentry_path->ptr);
+		return -1;
+	}
 
 	slash_pos = (char *)strchr(treeentry_path->ptr + offset, '/');
 
@@ -644,9 +635,11 @@ static int tree_frompath(
 			git_object_id((const git_object *)root)
 		);
 
-	if (slash_pos == treeentry_path->ptr + offset)
-		return git__rethrow(GIT_EINVALIDPATH,
+	if (slash_pos == treeentry_path->ptr + offset) {
+		giterr_set(GITERR_INVALID,
 			"Invalid relative path to a tree entry '%s'.", treeentry_path->ptr);
+		return -1;
+	}
 
 	*slash_pos = '\0';
 
@@ -655,14 +648,15 @@ static int tree_frompath(
 	if (slash_pos != NULL)
 		*slash_pos = '/';
 
-	if (entry == NULL)
-		return git__rethrow(GIT_ENOTFOUND,
+	if (entry == NULL) {
+		giterr_set(GITERR_TREE,
 			"No tree entry can be found from "
 			"the given tree and relative path '%s'.", treeentry_path->ptr);
+		return GIT_ENOTFOUND;
+	}
 
 
-	error = git_tree_lookup(&subtree, root->object.repo, &entry->oid);
-	if (error < GIT_SUCCESS)
+	if (git_tree_lookup(&subtree, root->object.repo, &entry->oid) < 0)
 		return error;
 
 	error = tree_frompath(
@@ -686,7 +680,7 @@ int git_tree_get_subtree(
 
 	assert(subtree && root && subtree_path);
 
-	if ((error = git_buf_sets(&buffer, subtree_path)) == GIT_SUCCESS)
+	if ((error = git_buf_sets(&buffer, subtree_path)) == 0)
 		error = tree_frompath(subtree, root, &buffer, 0);
 
 	git_buf_free(&buffer);
@@ -722,18 +716,17 @@ static int tree_walk_post(
 			git_buf_putc(path, '/');
 
 			if (git_buf_oom(path))
-				return GIT_ENOMEM;
+				return -1;
 
-			error = tree_walk_post(subtree, callback, path, payload);
-			if (error < GIT_SUCCESS)
-				break;
+			if (tree_walk_post(subtree, callback, path, payload) < 0)
+				return -1;
 
 			git_buf_truncate(path, path_len);
 			git_tree_free(subtree);
 		}
 	}
 
-	return error;
+	return 0;
 }
 
 int git_tree_walk(git_tree *tree, git_treewalk_cb callback, int mode, void *payload)
@@ -747,14 +740,12 @@ int git_tree_walk(git_tree *tree, git_treewalk_cb callback, int mode, void *payl
 			break;
 
 		case GIT_TREEWALK_PRE:
-			error = git__throw(GIT_ENOTIMPLEMENTED,
-				"Preorder tree walking is still not implemented");
-			break;
+			tree_error("Preorder tree walking is still not implemented");
+			return GIT_ENOTIMPLEMENTED;
 
 		default:
-			error = git__throw(GIT_EINVALIDARGS,
-				"Invalid walking mode for tree walk");
-			break;
+			giterr_set(GITERR_INVALID, "Invalid walking mode for tree walk");
+			return -1;
 	}
 
 	git_buf_free(&root_path);
@@ -793,7 +784,7 @@ static int signal_additions(git_tree *tree, int start, int end, git_tree_diff_cb
 {
 	git_tree_diff_data diff;
 	git_tree_entry *entry;
-	int i, error;
+	int i;
 
 	if (end < 0)
 		end = git_tree_entrycount(tree);
@@ -803,12 +794,11 @@ static int signal_additions(git_tree *tree, int start, int end, git_tree_diff_cb
 		entry = git_vector_get(&tree->entries, i);
 		mark_add(&diff, entry);
 
-		error = cb(&diff, data);
-		if (error < GIT_SUCCESS)
-			return error;
+		if (cb(&diff, data) < 0)
+			return -1;
 	}
 
-	return GIT_SUCCESS;
+	return 0;
 }
 
 static int signal_addition(git_tree_entry *entry, git_tree_diff_cb cb, void *data)
@@ -826,7 +816,7 @@ static int signal_deletions(git_tree *tree, int start, int end, git_tree_diff_cb
 {
 	git_tree_diff_data diff;
 	git_tree_entry *entry;
-	int i, error;
+	int i;
 
 	if (end < 0)
 		end = git_tree_entrycount(tree);
@@ -836,12 +826,11 @@ static int signal_deletions(git_tree *tree, int start, int end, git_tree_diff_cb
 		entry = git_vector_get(&tree->entries, i);
 		mark_del(&diff, entry);
 
-		error = cb(&diff, data);
-		if (error < GIT_SUCCESS)
-			return error;
+		if (cb(&diff, data) < 0)
+			return -1;
 	}
 
-	return GIT_SUCCESS;
+	return 0;
 }
 
 static int signal_deletion(git_tree_entry *entry, git_tree_diff_cb cb, void *data)
@@ -873,14 +862,14 @@ int git_tree_diff(git_tree *a, git_tree *b, git_tree_diff_cb cb, void *data)
 	unsigned int i_a = 0, i_b = 0; /* Counters for trees a and b */
 	git_tree_entry *entry_a = NULL, *entry_b = NULL;
 	git_tree_diff_data diff;
-	int error = GIT_SUCCESS, cmp;
+	int cmp;
 
 	while (1) {
 		entry_a = a == NULL ? NULL : git_vector_get(&a->entries, i_a);
 		entry_b = b == NULL ? NULL : git_vector_get(&b->entries, i_b);
 
 		if (!entry_a && !entry_b)
-			goto exit;
+			return 0;
 
 		memset(&diff, 0x0, sizeof(git_tree_diff_data));
 
@@ -911,29 +900,28 @@ int git_tree_diff(git_tree *a, git_tree *b, git_tree_diff_cb cb, void *data)
 
 			/* If they're not both dirs or both files, it's add + del */
 			if (S_ISDIR(entry_a->attr) != S_ISDIR(entry_b->attr)) {
-				if ((error = signal_addition(entry_a, cb, data)) < 0)
-					goto exit;
-				if ((error = signal_deletion(entry_b, cb, data)) < 0)
-					goto exit;
+				if (signal_addition(entry_a, cb, data) < 0)
+					return -1;
+				if (signal_deletion(entry_b, cb, data) < 0)
+					return -1;
 			}
 
 			/* Otherwise consider it a modification */
-			if ((error = signal_modification(entry_a, entry_b, cb, data)) < 0)
-				goto exit;
+			if (signal_modification(entry_a, entry_b, cb, data) < 0)
+				return -1;
 
 		} else if (cmp < 0) {
 			i_a++;
-			if ((error = signal_deletion(entry_a, cb, data)) < 0)
-				goto exit;
+			if (signal_deletion(entry_a, cb, data) < 0)
+				return -1;
 		} else if (cmp > 0) {
 			i_b++;
-			if ((error = signal_addition(entry_b, cb, data)) < 0)
-				goto exit;
+			if (signal_addition(entry_b, cb, data) < 0)
+				return -1;
 		}
 	}
 
-exit:
-	return error;
+	return 0;
 }
 
 struct diff_index_cbdata {
@@ -978,53 +966,49 @@ static int diff_index_cb(const char *root, git_tree_entry *tentry, void *data)
 	git_index_entry *ientry = git_index_get(cbdata->index, cbdata->i);
 	git_tree_entry fake_entry;
 	git_buf fn_buf = GIT_BUF_INIT;
-	int cmp, error = GIT_SUCCESS;
+	int cmp;
 
 	if (entry_is_tree(tentry))
-		return GIT_SUCCESS;
+		return 0;
+
+	if (!ientry)
+		return signal_deletion(tentry, cbdata->cb, cbdata->data);
 
 	git_buf_puts(&fn_buf, root);
 	git_buf_puts(&fn_buf, tentry->filename);
 
-	if (!ientry) {
-		error = signal_deletion(tentry, cbdata->cb, cbdata->data);
-		git_buf_free(&fn_buf);
-		goto exit;
-	}
-
 	/* Like with 'git diff-index', the index is the right side*/
 	cmp = strcmp(git_buf_cstr(&fn_buf), ientry->path);
 	git_buf_free(&fn_buf);
 	if (cmp == 0) {
 		cbdata->i++;
 		if (!cmp_tentry_ientry(tentry, ientry))
-			goto exit;
+			return 0;
 		/* modification */
 		make_tentry(&fake_entry, ientry);
-		if ((error = signal_modification(tentry, &fake_entry, cbdata->cb, cbdata->data)) < 0)
-			goto exit;
+		if (signal_modification(tentry, &fake_entry, cbdata->cb, cbdata->data) < 0)
+			return -1;
 	} else if (cmp < 0) {
 		/* deletion */
 		memcpy(&fake_entry, tentry, sizeof(git_tree_entry));
-		if ((error = signal_deletion(tentry, cbdata->cb, cbdata->data)) < 0)
-			goto exit;
+		if (signal_deletion(tentry, cbdata->cb, cbdata->data) < 0)
+			return -1;
 	} else {
 		/* addition */
 		cbdata->i++;
 		make_tentry(&fake_entry, ientry);
-		if ((error = signal_addition(&fake_entry, cbdata->cb, cbdata->data)) < 0)
-			goto exit;
+		if (signal_addition(&fake_entry, cbdata->cb, cbdata->data) < 0)
+			return -1;
 		/*
 		 * The index has an addition. This means that we need to use
 		 * the next entry in the index without advancing the tree
 		 * walker, so call ourselves with the same tree state.
 		 */
-		if ((error = diff_index_cb(root, tentry, data)) < 0)
-			goto exit;
+		if (diff_index_cb(root, tentry, data) < 0)
+			return -1;;
 	}
 
- exit:
-	return error;
+	return 0;
 }
 
 int git_tree_diff_index_recursive(git_tree *tree, git_index *index, git_tree_diff_cb cb, void *data)
diff --git a/tests-clar/object/tree/frompath.c b/tests-clar/object/tree/frompath.c
index 523a0b9..15f0e91 100644
--- a/tests-clar/object/tree/frompath.c
+++ b/tests-clar/object/tree/frompath.c
@@ -40,6 +40,12 @@ static void assert_tree_from_path(git_tree *root, const char *path, int expected
 	git_tree_free(containing_tree);
 }
 
+static void assert_tree_from_path_klass(git_tree *root, const char *path, int expected_result, const char *expected_raw_oid)
+{
+	assert_tree_from_path(root, path, GIT_ERROR, expected_raw_oid);
+	cl_assert(git_error_last()->klass == expected_result);
+}
+
 void test_object_tree_frompath__retrieve_tree_from_path_to_treeentry(void)
 {
 	/* Will return self if given a one path segment... */
@@ -66,10 +72,10 @@ void test_object_tree_frompath__fail_when_processing_an_unknown_tree_segment(voi
 
 void test_object_tree_frompath__fail_when_processing_an_invalid_path(void)
 {
-	assert_tree_from_path(tree, "/", GIT_EINVALIDPATH, NULL);
-	assert_tree_from_path(tree, "/ab", GIT_EINVALIDPATH, NULL);
-	assert_tree_from_path(tree, "/ab/de", GIT_EINVALIDPATH, NULL);
-	assert_tree_from_path(tree, "ab/", GIT_EINVALIDPATH, NULL);
-	assert_tree_from_path(tree, "ab//de", GIT_EINVALIDPATH, NULL);
-	assert_tree_from_path(tree, "ab/de/", GIT_EINVALIDPATH, NULL);
+	assert_tree_from_path_klass(tree, "/", GITERR_INVALID, NULL);
+	assert_tree_from_path_klass(tree, "/ab", GITERR_INVALID, NULL);
+	assert_tree_from_path_klass(tree, "/ab/de", GITERR_INVALID, NULL);
+	assert_tree_from_path_klass(tree, "ab/", GITERR_INVALID, NULL);
+	assert_tree_from_path_klass(tree, "ab//de", GITERR_INVALID, NULL);
+	assert_tree_from_path_klass(tree, "ab/de/", GITERR_INVALID, NULL);
 }