commit - 0f91044a8e1edfa553268e8437f58c21e1e4ac39
commit + 50e7a649ac62e04706162f1e9b7b37e7485fc7ca
blob - af59edb11f59ce50cc07c7c94d5fb05a9acc0f54
blob + 802e8d33b5cc2470f76a85b5a09648dfdcaceed3
--- got/got.c
+++ got/got.c
@@ -10017,7 +10017,7 @@ cmd_rebase(int argc, char *argv[])
 	struct got_worktree *worktree = NULL;
 	struct got_repository *repo = NULL;
 	struct got_fileindex *fileindex = NULL;
-	char *cwd = NULL, *committer = NULL;
+	char *cwd = NULL, *committer = NULL, *gitconfig_path = NULL;
 	struct got_reference *branch = NULL;
 	struct got_reference *new_base_branch = NULL, *tmp_branch = NULL;
 	struct got_object_id *commit_id = NULL, *parent_id = NULL;
@@ -10117,14 +10117,17 @@ cmd_rebase(int argc, char *argv[])
 		}
 	}
 
+	error = get_gitconfig_path(&gitconfig_path);
+	if (error)
+		goto done;
 	error = got_repo_open(&repo,
-	    worktree ? got_worktree_get_repo_path(worktree) : cwd, NULL,
-	    pack_fds);
+	    worktree ? got_worktree_get_repo_path(worktree) : cwd,
+	    gitconfig_path, pack_fds);
 	if (error != NULL)
 		goto done;
 
 	error = get_author(&committer, repo, worktree);
-	if (error)
+	if (error && error->code != GOT_ERR_COMMIT_NO_AUTHOR)
 		goto done;
 
 	error = apply_unveil(got_repo_get_path(repo), 0,
@@ -10393,6 +10396,7 @@ cmd_rebase(int argc, char *argv[])
 done:
 	free(cwd);
 	free(committer);
+	free(gitconfig_path);
 	got_object_id_queue_free(&commits);
 	free(branch_head_commit_id);
 	free(resume_commit_id);
blob - 718cf72db051a1e897c1d70657ac5f12fa7b1043
blob + 587972ac2ca3434668208f4e401ac33c622657a1
--- lib/worktree.c
+++ lib/worktree.c
@@ -6536,8 +6536,9 @@ rebase_commit(struct got_object_id **new_commit_id,
 	/* NB: commit_worktree will call free(logmsg) */
 	err = commit_worktree(new_commit_id, &commitable_paths, head_commit_id,
 	    NULL, worktree, got_object_commit_get_author(orig_commit),
-	    committer, collect_rebase_commit_msg, logmsg, rebase_status, NULL,
-	    repo);
+	    committer ? committer :
+	    got_object_commit_get_committer(orig_commit),
+	    collect_rebase_commit_msg, logmsg, rebase_status, NULL, repo);
 	if (err)
 		goto done;
 
blob - 2bdfc42c631a9bad8763528b9082b0deacbed9d9
blob + 17e0a03100631d85b1f0e371cf6380a5c8c25fe3
--- regress/cmdline/rebase.sh
+++ regress/cmdline/rebase.sh
@@ -1559,12 +1559,99 @@ test_rebase_resets_committer() {
 		egrep '^(from|via):' > $testroot/stdout)
 	echo "from: $GOT_AUTHOR" > $testroot/stdout.expected
 	echo "via: $committer" >> $testroot/stdout.expected
+
+	cmp -s $testroot/stdout.expected $testroot/stdout
+	ret=$?
+	if [ $ret -ne 0 ]; then
+		diff -u $testroot/stdout.expected $testroot/stdout
+	fi
+	test_done "$testroot" "$ret"
+}
+
+test_rebase_no_author_info() {
+	local testroot=`test_init rebase_no_author_info`
+	local commit0=`git_show_head $testroot/repo`
+	local commit0_author_time=`git_show_author_time $testroot/repo`
+	local committer="$GOT_AUTHOR"
+
+	(cd $testroot/repo && git checkout -q -b newbranch)
+	echo "modified delta on branch" > $testroot/repo/gamma/delta
+	git_commit $testroot/repo -m "committing to delta on newbranch"
+
+	echo "modified alpha on branch" > $testroot/repo/alpha
+	git_commit $testroot/repo -m "committing more changes on newbranch"
+
+	local orig_commit1=`git_show_parent_commit $testroot/repo`
+	local orig_commit2=`git_show_head $testroot/repo`
+	local orig_author_time2=`git_show_author_time $testroot/repo`
+
+	(cd $testroot/repo && git checkout -q master)
+	echo "modified zeta on master" > $testroot/repo/epsilon/zeta
+	git_commit $testroot/repo -m "committing to zeta on master"
+	local master_commit=`git_show_head $testroot/repo`
+
+	got checkout $testroot/repo $testroot/wt > /dev/null
+	ret=$?
+	if [ $ret -ne 0 ]; then
+		test_done "$testroot" "$ret"
+		return 1
+	fi
+
+	unset GOT_AUTHOR
+	(cd $testroot/wt && got rebase newbranch > $testroot/stdout)
+
+	(cd $testroot/repo && git checkout -q newbranch)
+	local new_commit1=`git_show_parent_commit $testroot/repo`
+	local new_commit2=`git_show_head $testroot/repo`
+	local new_author_time2=`git_show_author_time $testroot/repo`
 
+	local short_orig_commit1=`trim_obj_id 28 $orig_commit1`
+	local short_orig_commit2=`trim_obj_id 28 $orig_commit2`
+	local short_new_commit1=`trim_obj_id 28 $new_commit1`
+	local short_new_commit2=`trim_obj_id 28 $new_commit2`
+
+	echo "G  gamma/delta" >> $testroot/stdout.expected
+	echo -n "$short_orig_commit1 -> $short_new_commit1" \
+		>> $testroot/stdout.expected
+	echo ": committing to delta on newbranch" >> $testroot/stdout.expected
+	echo "G  alpha" >> $testroot/stdout.expected
+	echo -n "$short_orig_commit2 -> $short_new_commit2" \
+		>> $testroot/stdout.expected
+	echo ": committing more changes on newbranch" \
+		>> $testroot/stdout.expected
+	echo "Switching work tree to refs/heads/newbranch" \
+		>> $testroot/stdout.expected
+
 	cmp -s $testroot/stdout.expected $testroot/stdout
 	ret=$?
 	if [ $ret -ne 0 ]; then
 		diff -u $testroot/stdout.expected $testroot/stdout
+		test_done "$testroot" "$ret"
+		return 1
 	fi
+
+	# Original commit only had one author
+	(cd $testroot/repo && got log -l1 -c $orig_commit2 | \
+		egrep '^(from|via):' > $testroot/stdout)
+	echo "from: $committer" > $testroot/stdout.expected
+	cmp -s $testroot/stdout.expected $testroot/stdout
+	ret=$?
+	if [ $ret -ne 0 ]; then
+		diff -u $testroot/stdout.expected $testroot/stdout
+		test_done "$testroot" "$ret"
+		return 1
+	fi
+
+	# Author info of rebased commit should match the original
+	(cd $testroot/repo && got log -l1 -c $new_commit2 | \
+		egrep '^(from|via):' > $testroot/stdout)
+	echo "from: $committer" > $testroot/stdout.expected
+
+	cmp -s $testroot/stdout.expected $testroot/stdout
+	ret=$?
+	if [ $ret -ne 0 ]; then
+		diff -u $testroot/stdout.expected $testroot/stdout
+	fi
 	test_done "$testroot" "$ret"
 }
 
@@ -1584,3 +1671,4 @@ run_test test_rebase_trims_empty_dir
 run_test test_rebase_delete_missing_file
 run_test test_rebase_rm_add_rm_file
 run_test test_rebase_resets_committer
+run_test test_rebase_no_author_info