$ git clone -n https://src.fedoraproject.org/rpms/perl-Devel-FastProf.git /var/lib/mock/f41-build-816161-150026/root/chroot_tmpdir/scmroot/perl-Devel-FastProf
Cloning into '/var/lib/mock/f41-build-816161-150026/root/chroot_tmpdir/scmroot/perl-Devel-FastProf'...
$ git fetch origin 711e647f2576a16e8ffe8576a9e714335b92a811:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Devel-FastProf
 * [new ref]         711e647f2576a16e8ffe8576a9e714335b92a811 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 711e647 Perl 5.40 rebuild