$ git clone -n https://src.fedoraproject.org/rpms/rust-uu_cut.git /var/lib/mock/f40-build-704041-12986/root/chroot_tmpdir/scmroot/rust-uu_cut
Cloning into '/var/lib/mock/f40-build-704041-12986/root/chroot_tmpdir/scmroot/rust-uu_cut'...
$ git fetch origin 6695c78e6124c635db9c2726304608a19cdcbd8b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-uu_cut
 * [new ref]         6695c78e6124c635db9c2726304608a19cdcbd8b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6695c78 Rebuild with Rust 1.78 to fix incomplete debuginfo and backtraces