$ git clone -n https://src.fedoraproject.org/rpms/perl-Gtk2-Ex-CalendarButton.git /var/lib/mock/f39-build-1678574-40964/root/chroot_tmpdir/scmroot/perl-Gtk2-Ex-CalendarButton
Cloning into '/var/lib/mock/f39-build-1678574-40964/root/chroot_tmpdir/scmroot/perl-Gtk2-Ex-CalendarButton'...
$ git fetch origin 2464812c8a62b28e483f6eaf37640afbb29cc13f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Gtk2-Ex-CalendarButton
 * [new ref]         2464812c8a62b28e483f6eaf37640afbb29cc13f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2464812 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild