$ git clone -n https://src.fedoraproject.org/rpms/perl-Devel-Hexdump.git /var/lib/mock/f41-build-815836-149783/root/chroot_tmpdir/scmroot/perl-Devel-Hexdump
Cloning into '/var/lib/mock/f41-build-815836-149783/root/chroot_tmpdir/scmroot/perl-Devel-Hexdump'...
$ git fetch origin 9da765370bc0c6851190199d240061ad861bae02:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Devel-Hexdump
 * [new ref]         9da765370bc0c6851190199d240061ad861bae02 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9da7653 Perl 5.40 rebuild