$ git clone -n http://git.inferitos.ru/rpms/gcc-toolset-9-gcc /var/lib/mock/inferit-8_8-build-13729-23032/root/chroot_tmpdir/scmroot/gcc-toolset-9-gcc
Cloning into '/var/lib/mock/inferit-8_8-build-13729-23032/root/chroot_tmpdir/scmroot/gcc-toolset-9-gcc'...
$ git fetch origin changed/i8c/gcc-toolset-9-gcc-9.2.1-2.3.el8:KOJI_FETCH_HEAD
From http://git.inferitos.ru/rpms/gcc-toolset-9-gcc
 * [new tag]         changed/i8c/gcc-toolset-9-gcc-9.2.1-2.3.el8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 559a792 edit changelog for import gcc-toolset-9-gcc-9.2.1-2.3.el8