$ git clone -n https://src.fedoraproject.org/rpms/rust-scratch.git /var/lib/mock/f38-build-side-42-init-devel-1395150-31050/root/chroot_tmpdir/scmroot/rust-scratch
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1395150-31050/root/chroot_tmpdir/scmroot/rust-scratch'...
$ git fetch origin 098a092c6a3579ac968d992e440fdab22c64742d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-scratch
 * [new ref]         098a092c6a3579ac968d992e440fdab22c64742d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 098a092 Update to version 1.0.7; Fixes RHBZ#2223139