$ git clone -n https://src.fedoraproject.org/rpms/perl-Fedora-Rebuild.git /var/lib/mock/f41-build-side-1-2800817-32804/root/chroot_tmpdir/scmroot/perl-Fedora-Rebuild
Cloning into '/var/lib/mock/f41-build-side-1-2800817-32804/root/chroot_tmpdir/scmroot/perl-Fedora-Rebuild'...
$ git fetch origin 41451f7e2c87c3c15985bdbc5b81b26bb739eaa1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Fedora-Rebuild
 * [new ref]         41451f7e2c87c3c15985bdbc5b81b26bb739eaa1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 41451f7 convert GPLv3+ license to SPDX