$ git clone -n https://src.fedoraproject.org/rpms/perl-Plack.git /var/lib/mock/f45-build-25846-613/root/chroot_tmpdir/scmroot/perl-Plack
Cloning into '/var/lib/mock/f45-build-25846-613/root/chroot_tmpdir/scmroot/perl-Plack'...
$ git fetch origin fd2252cca58ce8072f5bdb32693b722c9560add7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Plack
 * [new ref]         fd2252cca58ce8072f5bdb32693b722c9560add7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fd2252c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild