$ git clone -n https://src.fedoraproject.org/rpms/perl-Digest-BubbleBabble.git /var/lib/mock/f45-build-23178-596/root/chroot_tmpdir/scmroot/perl-Digest-BubbleBabble
Cloning into '/var/lib/mock/f45-build-23178-596/root/chroot_tmpdir/scmroot/perl-Digest-BubbleBabble'...
$ git fetch origin 4f8a86ba004aa288a7d63bc4de012bf697f83baf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Digest-BubbleBabble
 * [new ref]         4f8a86ba004aa288a7d63bc4de012bf697f83baf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4f8a86b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild