$ git clone -n https://src.fedoraproject.org/rpms/rust-uu_hashsum.git /var/lib/mock/f40-build-1971900-25224/root/chroot_tmpdir/scmroot/rust-uu_hashsum
Cloning into '/var/lib/mock/f40-build-1971900-25224/root/chroot_tmpdir/scmroot/rust-uu_hashsum'...
$ git fetch origin ac354686e82ea27892fe3cb11275d9a11015667f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-uu_hashsum
 * [new ref]         ac354686e82ea27892fe3cb11275d9a11015667f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ac35468 Update to version 0.0.27; Fixes RHBZ#2260215