$ git clone -n https://src.fedoraproject.org/rpms/source-to-image.git /var/lib/mock/f39-build-1581678-38092/root/chroot_tmpdir/scmroot/source-to-image
Cloning into '/var/lib/mock/f39-build-1581678-38092/root/chroot_tmpdir/scmroot/source-to-image'...
$ git fetch origin bca79a73258a6f2b007f7ccef174584475faf53e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/source-to-image
 * [new ref]         bca79a73258a6f2b007f7ccef174584475faf53e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bca79a7 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild