$ git clone -n https://src.fedoraproject.org/rpms/booksorg.git /var/lib/mock/f42-build-882080-184150/root/chroot_tmpdir/scmroot/booksorg
Cloning into '/var/lib/mock/f42-build-882080-184150/root/chroot_tmpdir/scmroot/booksorg'...
$ git fetch origin 6f9e569e9651450b1665a8b8212e549050a271f0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/booksorg
 * [new ref]         6f9e569e9651450b1665a8b8212e549050a271f0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6f9e569 Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild