$ git clone -n https://src.fedoraproject.org/rpms/perl-Net-Jabber.git /var/lib/mock/f40-build-2019643-46544/root/chroot_tmpdir/scmroot/perl-Net-Jabber
Cloning into '/var/lib/mock/f40-build-2019643-46544/root/chroot_tmpdir/scmroot/perl-Net-Jabber'...
$ git fetch origin 48d464d4e868b97694bd33e678725d4a9a8f88a6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Net-Jabber
 * [new ref]         48d464d4e868b97694bd33e678725d4a9a8f88a6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 48d464d Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild