$ git clone -n https://src.fedoraproject.org/rpms/perl-Devel-FastProf.git /var/lib/mock/f45-build-23100-595/root/chroot_tmpdir/scmroot/perl-Devel-FastProf
Cloning into '/var/lib/mock/f45-build-23100-595/root/chroot_tmpdir/scmroot/perl-Devel-FastProf'...
$ git fetch origin 4e67055be5e1da7f4c7575c2c6eb9663b5609a6a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Devel-FastProf
 * [new ref]         4e67055be5e1da7f4c7575c2c6eb9663b5609a6a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4e67055 Perl 5.44 rebuild