$ git clone -n https://src.fedoraproject.org/rpms/kchmviewer.git /var/lib/mock/f39-build-1630003-39588/root/chroot_tmpdir/scmroot/kchmviewer
Cloning into '/var/lib/mock/f39-build-1630003-39588/root/chroot_tmpdir/scmroot/kchmviewer'...
$ git fetch origin 94785e5447279440850d50164b3f51dcb6ee0af8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kchmviewer
 * [new ref]         94785e5447279440850d50164b3f51dcb6ee0af8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 94785e5 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild