$ git clone -n https://src.fedoraproject.org/rpms/perl-Sane.git /var/lib/mock/f45-build-26104-614/root/chroot_tmpdir/scmroot/perl-Sane
Cloning into '/var/lib/mock/f45-build-26104-614/root/chroot_tmpdir/scmroot/perl-Sane'...
$ git fetch origin 538060deca60696b3308419a7487ad1baa3f19a3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Sane
 * [new ref]         538060deca60696b3308419a7487ad1baa3f19a3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 538060d Perl 5.44 rebuild