$ git clone -n https://src.fedoraproject.org/rpms/rust-vm-memory.git /var/lib/mock/f41-build-side-1-3130599-39594/root/chroot_tmpdir/scmroot/rust-vm-memory
Cloning into '/var/lib/mock/f41-build-side-1-3130599-39594/root/chroot_tmpdir/scmroot/rust-vm-memory'...
$ git fetch origin 54ddac445939f4ed59eb110b7062cabf53b6dc8a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-vm-memory
 * [new ref]         54ddac445939f4ed59eb110b7062cabf53b6dc8a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 54ddac4 Update to version 0.16.1; Fixes RHBZ#2268989