thodg/libgit2

diff --git a/CHANGELOG.md b/CHANGELOG.md
index be8e924..69c6991 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -101,6 +101,10 @@ v0.22 + 1
 * `git_note_default_ref()` now uses a `git_buf` to return the string,
   as the string is otherwise not guaranteed to stay allocated.
 
+* `git_rebase_operation_current()` will return `GIT_REBASE_NO_OPERATION`
+  if it is called immediately after creating a rebase session but before
+  you have applied the first patch.
+
 v0.22
 ------
 
diff --git a/include/git2/rebase.h b/include/git2/rebase.h
index 58b66b7..3d8d180 100644
--- a/include/git2/rebase.h
+++ b/include/git2/rebase.h
@@ -89,6 +89,9 @@ typedef enum {
 #define GIT_REBASE_OPTIONS_VERSION 1
 #define GIT_REBASE_OPTIONS_INIT {GIT_REBASE_OPTIONS_VERSION}
 
+/** Indicates that a rebase operation is not (yet) in progress. */
+#define GIT_REBASE_NO_OPERATION SIZE_MAX
+
 /**
  * A rebase operation
  *
@@ -170,6 +173,9 @@ GIT_EXTERN(size_t) git_rebase_operation_entrycount(git_rebase *rebase);
 
 /**
  * Gets the index of the rebase operation that is currently being applied.
+ * If the first operation has not yet been applied (because you have
+ * called `init` but not yet `next`) then this returns
+ * `GIT_REBASE_NO_OPERATION`.
  *
  * @param rebase The in-progress rebase
  * @return The index of the rebase operation currently being applied.
diff --git a/src/rebase.c b/src/rebase.c
index eb25d4c..3bc10f4 100644
--- a/src/rebase.c
+++ b/src/rebase.c
@@ -1148,7 +1148,7 @@ size_t git_rebase_operation_current(git_rebase *rebase)
 {
 	assert(rebase);
 
-	return rebase->current;
+	return rebase->started ? rebase->current : GIT_REBASE_NO_OPERATION;
 }
 
 git_rebase_operation *git_rebase_operation_byindex(git_rebase *rebase, size_t idx)
diff --git a/tests/rebase/iterator.c b/tests/rebase/iterator.c
index 2cff82c..23272d5 100644
--- a/tests/rebase/iterator.c
+++ b/tests/rebase/iterator.c
@@ -65,7 +65,7 @@ void test_rebase_iterator__iterates(void)
 	cl_git_pass(git_annotated_commit_from_ref(&upstream_head, repo, upstream_ref));
 
 	cl_git_pass(git_rebase_init(&rebase, repo, branch_head, upstream_head, NULL, NULL));
-	test_operations(rebase, 0);
+	test_operations(rebase, GIT_REBASE_NO_OPERATION);
 	git_rebase_free(rebase);
 
 	cl_git_pass(git_rebase_open(&rebase, repo));