$ git clone -n https://src.fedoraproject.org/rpms/rust-procs.git /var/lib/mock/f42-build-3457977-45512/root/chroot_tmpdir/scmroot/rust-procs
Cloning into '/var/lib/mock/f42-build-3457977-45512/root/chroot_tmpdir/scmroot/rust-procs'...
$ git fetch origin 17707ab4d8e5d5e19b470bae1457ed4c6599a151:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-procs
 * [new ref]         17707ab4d8e5d5e19b470bae1457ed4c6599a151 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 17707ab Update to version 0.14.9; Fixes RHBZ#2338566