$ git clone -n https://src.fedoraproject.org/rpms/R-bookdown /var/lib/mock/f39-build-1582228-38106/root/chroot_tmpdir/scmroot/R-bookdown
Cloning into '/var/lib/mock/f39-build-1582228-38106/root/chroot_tmpdir/scmroot/R-bookdown'...
$ git fetch origin 357efc6aca6ba4dc129634b0474d11bf71c66324:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-bookdown
 * [new ref]         357efc6aca6ba4dc129634b0474d11bf71c66324 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 357efc6 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild