$ git clone -n https://src.fedoraproject.org/rpms/ruby.git /var/lib/mock/f41-build-861786-170046/root/chroot_tmpdir/scmroot/ruby
Cloning into '/var/lib/mock/f41-build-861786-170046/root/chroot_tmpdir/scmroot/ruby'...
$ git fetch origin aaa3b220d26b7459126e25bdd241f68dd7ef90fd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ruby
 * [new ref]         aaa3b220d26b7459126e25bdd241f68dd7ef90fd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at aaa3b22 Add riscv64 information for checksec