$ git clone -n https://src.fedoraproject.org/rpms/rust-coreos-installer.git /var/lib/mock/f40-build-2625026-65137/root/chroot_tmpdir/scmroot/rust-coreos-installer
Cloning into '/var/lib/mock/f40-build-2625026-65137/root/chroot_tmpdir/scmroot/rust-coreos-installer'...
$ git fetch origin bc2ea37fe8b91827058657a4273ab2b869cc06d5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-coreos-installer
 * [new ref]         bc2ea37fe8b91827058657a4273ab2b869cc06d5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bc2ea37 [packit] 0.21.0 upstream release