$ git clone -n https://src.fedoraproject.org/rpms/rust-spin.git /var/lib/mock/f40-build-2150929-50901/root/chroot_tmpdir/scmroot/rust-spin
Cloning into '/var/lib/mock/f40-build-2150929-50901/root/chroot_tmpdir/scmroot/rust-spin'...
$ git fetch origin b6ab026847ee8f16d836c3f2773524a52c422739:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-spin
 * [new ref]         b6ab026847ee8f16d836c3f2773524a52c422739 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b6ab026 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild