$ git clone -n https://src.fedoraproject.org/rpms/rust-memmap2.git /var/lib/mock/f45-build-43273-801/root/chroot_tmpdir/scmroot/rust-memmap2
Cloning into '/var/lib/mock/f45-build-43273-801/root/chroot_tmpdir/scmroot/rust-memmap2'...
$ git fetch origin db897be37dd796d620b3032ece46f555c3d30323:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-memmap2
 * [new ref]         db897be37dd796d620b3032ece46f555c3d30323 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at db897be Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild