$ git clone -n https://src.fedoraproject.org/rpms/exercism.git /var/lib/mock/f45-build-8532-390/root/chroot_tmpdir/scmroot/exercism
Cloning into '/var/lib/mock/f45-build-8532-390/root/chroot_tmpdir/scmroot/exercism'...
$ git fetch origin 4e0e64cbe0c9e5858f9507e2ae768c9ca9d14ac2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/exercism
 * [new ref]         4e0e64cbe0c9e5858f9507e2ae768c9ca9d14ac2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4e0e64c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild