$ git clone -n https://src.fedoraproject.org/rpms/gcl.git /var/lib/mock/f45-build-9647-407/root/chroot_tmpdir/scmroot/gcl
Cloning into '/var/lib/mock/f45-build-9647-407/root/chroot_tmpdir/scmroot/gcl'...
$ git fetch origin fc72831d8217866db69cbdc3ac5cbabc384d346c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gcl
 * [new ref]         fc72831d8217866db69cbdc3ac5cbabc384d346c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fc72831 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild