$ git clone -n https://src.fedoraproject.org/rpms/fedora-chromium-config.git /var/lib/mock/f42-bootstrap-3533740-46421/root/chroot_tmpdir/scmroot/fedora-chromium-config
Cloning into '/var/lib/mock/f42-bootstrap-3533740-46421/root/chroot_tmpdir/scmroot/fedora-chromium-config'...
$ git fetch origin 84f4522e5736f167955a9e86e5ebe065c6ae955a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fedora-chromium-config
 * [new ref]         84f4522e5736f167955a9e86e5ebe065c6ae955a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 84f4522 Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild