$ git clone -n https://src.fedoraproject.org/rpms/rep-gtk.git /var/lib/mock/f40-build-757322-119345/root/chroot_tmpdir/scmroot/rep-gtk
Cloning into '/var/lib/mock/f40-build-757322-119345/root/chroot_tmpdir/scmroot/rep-gtk'...
$ git fetch origin 6fc7346d13b20cd356d5c3cb6335c8dbc870aa63:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rep-gtk
 * [new ref]         6fc7346d13b20cd356d5c3cb6335c8dbc870aa63 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6fc7346 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild