$ git clone -n https://src.fedoraproject.org/rpms/gnome-epub-thumbnailer.git /var/lib/mock/f45-build-11420-430/root/chroot_tmpdir/scmroot/gnome-epub-thumbnailer
Cloning into '/var/lib/mock/f45-build-11420-430/root/chroot_tmpdir/scmroot/gnome-epub-thumbnailer'...
$ git fetch origin 2f21505c03d2b77e5c1b4e426a9c823ee3111b19:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-epub-thumbnailer
 * [new ref]         2f21505c03d2b77e5c1b4e426a9c823ee3111b19 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2f21505 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild