$ git clone -n https://src.fedoraproject.org/rpms/gnome-mime-data.git /var/lib/mock/f45-build-11444-430/root/chroot_tmpdir/scmroot/gnome-mime-data
Cloning into '/var/lib/mock/f45-build-11444-430/root/chroot_tmpdir/scmroot/gnome-mime-data'...
$ git fetch origin 23058e99abffd56f49d705c3e73f42118ff84aae:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-mime-data
 * [new ref]         23058e99abffd56f49d705c3e73f42118ff84aae -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 23058e9 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild