$ git clone -n https://src.fedoraproject.org/rpms/rust-procs.git /var/lib/mock/f41-build-861637-169928/root/chroot_tmpdir/scmroot/rust-procs
Cloning into '/var/lib/mock/f41-build-861637-169928/root/chroot_tmpdir/scmroot/rust-procs'...
$ git fetch origin 54bcef84fcea296573731db5a49e33a8cdb1acc8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-procs
 * [new ref]         54bcef84fcea296573731db5a49e33a8cdb1acc8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 54bcef8 Update to version 0.14.6; Fixes RHBZ#2268356