$ git clone -n https://src.fedoraproject.org/rpms/rust-nu-pretty-hex.git /var/lib/mock/f40-build-2642574-66458/root/chroot_tmpdir/scmroot/rust-nu-pretty-hex
Cloning into '/var/lib/mock/f40-build-2642574-66458/root/chroot_tmpdir/scmroot/rust-nu-pretty-hex'...
$ git fetch origin 51a5a12aba8efe3b644e589d444e4be73a3c3346:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-nu-pretty-hex
 * [new ref]         51a5a12aba8efe3b644e589d444e4be73a3c3346 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 51a5a12 Update to 0.91.0 (rhbz#2257510)