$ git clone -n https://src.fedoraproject.org/rpms/perl-Dist-Build.git /var/lib/mock/f45-build-23201-596/root/chroot_tmpdir/scmroot/perl-Dist-Build
Cloning into '/var/lib/mock/f45-build-23201-596/root/chroot_tmpdir/scmroot/perl-Dist-Build'...
$ git fetch origin 33f2790ba899b3ba25ddbc1fe40baeab9bd4716c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Dist-Build
 * [new ref]         33f2790ba899b3ba25ddbc1fe40baeab9bd4716c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 33f2790 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild