$ git clone -n https://src.fedoraproject.org/rpms/perl-Algorithm-Merge.git /var/lib/mock/f45-build-21653-587/root/chroot_tmpdir/scmroot/perl-Algorithm-Merge
Cloning into '/var/lib/mock/f45-build-21653-587/root/chroot_tmpdir/scmroot/perl-Algorithm-Merge'...
$ git fetch origin c304a0e3d1d798f426510d2fae03cf38d9060496:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Algorithm-Merge
 * [new ref]         c304a0e3d1d798f426510d2fae03cf38d9060496 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c304a0e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild