$ git clone -n https://src.fedoraproject.org/rpms/rust-ouroboros_macro.git /var/lib/mock/f45-build-43603-804/root/chroot_tmpdir/scmroot/rust-ouroboros_macro
Cloning into '/var/lib/mock/f45-build-43603-804/root/chroot_tmpdir/scmroot/rust-ouroboros_macro'...
$ git fetch origin 6c21d9ce37e1e1e3038ade27f8d25f273644a0b9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-ouroboros_macro
 * [new ref]         6c21d9ce37e1e1e3038ade27f8d25f273644a0b9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6c21d9c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild