$ git clone -n https://src.fedoraproject.org/rpms/perl-File-XDG.git /var/lib/mock/f45-build-23603-598/root/chroot_tmpdir/scmroot/perl-File-XDG
Cloning into '/var/lib/mock/f45-build-23603-598/root/chroot_tmpdir/scmroot/perl-File-XDG'...
$ git fetch origin 424bf171c9018c6a6207604e81a84feea754e30d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-File-XDG
 * [new ref]         424bf171c9018c6a6207604e81a84feea754e30d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 424bf17 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild