$ git clone -n https://src.fedoraproject.org/rpms/rust-unidiff.git /var/lib/mock/f45-build-45940-829/root/chroot_tmpdir/scmroot/rust-unidiff
Cloning into '/var/lib/mock/f45-build-45940-829/root/chroot_tmpdir/scmroot/rust-unidiff'...
$ git fetch origin 130a6e491f83856ea40e6fcb855361214b5af390:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-unidiff
 * [new ref]         130a6e491f83856ea40e6fcb855361214b5af390 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 130a6e4 Update to version 0.4.1; Fixes RHBZ#2501983