$ git clone -n https://src.fedoraproject.org/rpms/rust-uu_tail.git /var/lib/mock/f40-build-1971932-25224/root/chroot_tmpdir/scmroot/rust-uu_tail
Cloning into '/var/lib/mock/f40-build-1971932-25224/root/chroot_tmpdir/scmroot/rust-uu_tail'...
$ git fetch origin 108adf234f7269f74f0ac2dab15d4673a6f69c24:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-uu_tail
 * [new ref]         108adf234f7269f74f0ac2dab15d4673a6f69c24 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 108adf2 Update to version 0.0.27; Fixes: RHBZ#2260245