$ git clone -n https://src.fedoraproject.org/rpms/rust-hashbrown0.13.git /var/lib/mock/f38-build-side-43-rust-devel-1418945-31459/root/chroot_tmpdir/scmroot/rust-hashbrown0.13
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1418945-31459/root/chroot_tmpdir/scmroot/rust-hashbrown0.13'...
$ git fetch origin 3877acf2dcc014507f02c360e28fe0d495a6a5e9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-hashbrown0.13
 * [new ref]         3877acf2dcc014507f02c360e28fe0d495a6a5e9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3877acf Initial import (hashbrown 0.13 compat package)