$ git clone -n https://src.fedoraproject.org/rpms/rust-endian-num.git /var/lib/mock/f45-build-41435-782/root/chroot_tmpdir/scmroot/rust-endian-num
Cloning into '/var/lib/mock/f45-build-41435-782/root/chroot_tmpdir/scmroot/rust-endian-num'...
$ git fetch origin b6973623e5caa7d6fe63edf815b99a6342ece7d2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-endian-num
 * [new ref]         b6973623e5caa7d6fe63edf815b99a6342ece7d2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b697362 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild