$ git clone -n https://src.fedoraproject.org/rpms/rust-trybuild.git /var/lib/mock/f38-build-side-42-init-devel-1146960-30463/root/chroot_tmpdir/scmroot/rust-trybuild
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1146960-30463/root/chroot_tmpdir/scmroot/rust-trybuild'...
$ git fetch origin 3fb3f8a895001046047646111ee60b92f856c8b7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-trybuild
 * [new ref]         3fb3f8a895001046047646111ee60b92f856c8b7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3fb3f8a Update to version 1.0.82; Fixes RHBZ#2224488