$ git clone -n https://src.fedoraproject.org/rpms/lua-posix.git /var/lib/mock/f45-build-17690-502/root/chroot_tmpdir/scmroot/lua-posix
Cloning into '/var/lib/mock/f45-build-17690-502/root/chroot_tmpdir/scmroot/lua-posix'...
$ git fetch origin 45d6c4744f33d2965871f5f07508b0b68883dc0f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lua-posix
 * [new ref]         45d6c4744f33d2965871f5f07508b0b68883dc0f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 45d6c47 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild