$ git clone -n https://src.fedoraproject.org/rpms/asciinema.git /var/lib/mock/f40-build-2208694-52141/root/chroot_tmpdir/scmroot/asciinema
Cloning into '/var/lib/mock/f40-build-2208694-52141/root/chroot_tmpdir/scmroot/asciinema'...
$ git fetch origin b9900da5fa29f4c71771d57cc1ab683ae396e58e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/asciinema
 * [new ref]         b9900da5fa29f4c71771d57cc1ab683ae396e58e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b9900da Update to 2.4.0 (rhbz#2245762)