$ git clone -n https://src.fedoraproject.org/rpms/rust-memmap2_0.7.git /var/lib/mock/f40-build-2660907-66918/root/chroot_tmpdir/scmroot/rust-memmap2_0.7
Cloning into '/var/lib/mock/f40-build-2660907-66918/root/chroot_tmpdir/scmroot/rust-memmap2_0.7'...
$ git fetch origin 8ac6905126b8b416495a90f67661dc1b299aa0ce:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-memmap2_0.7
 * [new ref]         8ac6905126b8b416495a90f67661dc1b299aa0ce -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8ac6905 Initial import (memmap2 0.7 compat package)