$ git clone -n https://src.fedoraproject.org/rpms/rust-vm-memory.git /var/lib/mock/f39-build-1507698-35291/root/chroot_tmpdir/scmroot/rust-vm-memory
Cloning into '/var/lib/mock/f39-build-1507698-35291/root/chroot_tmpdir/scmroot/rust-vm-memory'...
$ git fetch origin 9ed46456469c3fa142e0046c4c43af54a6116238:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-vm-memory
 * [new ref]         9ed46456469c3fa142e0046c4c43af54a6116238 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9ed4645 Update to version 0.12.2; Fixes RHBZ#2229985