$ git clone -n https://src.fedoraproject.org/rpms/rust-half1.git /var/lib/mock/f40-build-2130266-50787/root/chroot_tmpdir/scmroot/rust-half1
Cloning into '/var/lib/mock/f40-build-2130266-50787/root/chroot_tmpdir/scmroot/rust-half1'...
$ git fetch origin 23881defed0d1f6a5fa4c9824249b4c7159dd139:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-half1
 * [new ref]         23881defed0d1f6a5fa4c9824249b4c7159dd139 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 23881de Initial import (half 1 compat package)