$ git clone -n https://src.fedoraproject.org/rpms/perl-Image-Sane.git /var/lib/mock/f45-build-24286-603/root/chroot_tmpdir/scmroot/perl-Image-Sane
Cloning into '/var/lib/mock/f45-build-24286-603/root/chroot_tmpdir/scmroot/perl-Image-Sane'...
$ git fetch origin 0501918398c2d08b291996a4ce8e4e74cd621ec7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Image-Sane
 * [new ref]         0501918398c2d08b291996a4ce8e4e74cd621ec7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0501918 Perl 5.44 rebuild