$ git clone -n https://src.fedoraproject.org/rpms/rust-uu_tsort.git /var/lib/mock/f41-build-side-1-2816517-32968/root/chroot_tmpdir/scmroot/rust-uu_tsort
Cloning into '/var/lib/mock/f41-build-side-1-2816517-32968/root/chroot_tmpdir/scmroot/rust-uu_tsort'...
$ git fetch origin 3aefac10486d121ad22f7b612564751c57fdde5c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-uu_tsort
 * [new ref]         3aefac10486d121ad22f7b612564751c57fdde5c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3aefac1 Update to version 0.0.27; Fixes: RHBZ#2260251