$ git clone -n https://src.fedoraproject.org/rpms/rust-uu_base32.git /var/lib/mock/f40-build-1906026-25074/root/chroot_tmpdir/scmroot/rust-uu_base32
Cloning into '/var/lib/mock/f40-build-1906026-25074/root/chroot_tmpdir/scmroot/rust-uu_base32'...
$ git fetch origin d2981746017abf701a2b9bc5a0fc0fd8950561de:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-uu_base32
 * [new ref]         d2981746017abf701a2b9bc5a0fc0fd8950561de -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d298174 Update to version 0.0.27; Fixes: RHBZ#2260192