$ git clone -n https://src.fedoraproject.org/rpms/rubygem-shoulda-context.git /var/lib/mock/f45-build-35314-694/root/chroot_tmpdir/scmroot/rubygem-shoulda-context
Cloning into '/var/lib/mock/f45-build-35314-694/root/chroot_tmpdir/scmroot/rubygem-shoulda-context'...
$ git fetch origin 686ccb07da97d4128e9adee3973d45f70bc4a101:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-shoulda-context
 * [new ref]         686ccb07da97d4128e9adee3973d45f70bc4a101 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 686ccb0 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild