$ git clone -n https://src.fedoraproject.org/rpms/perl-Sane.git /var/lib/mock/f41-build-815849-149783/root/chroot_tmpdir/scmroot/perl-Sane
Cloning into '/var/lib/mock/f41-build-815849-149783/root/chroot_tmpdir/scmroot/perl-Sane'...
$ git fetch origin 34f4ce57223cfd46fb40b436a024b81494442b5d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Sane
 * [new ref]         34f4ce57223cfd46fb40b436a024b81494442b5d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 34f4ce5 Perl 5.40 rebuild