$ git clone -n https://src.fedoraproject.org/rpms/gnome-extensions-app.git /var/lib/mock/f45-build-11421-430/root/chroot_tmpdir/scmroot/gnome-extensions-app
Cloning into '/var/lib/mock/f45-build-11421-430/root/chroot_tmpdir/scmroot/gnome-extensions-app'...
$ git fetch origin a0b42f58fdbf2e0fb24fa5452e3d9ddd5e5f91f4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-extensions-app
 * [new ref]         a0b42f58fdbf2e0fb24fa5452e3d9ddd5e5f91f4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a0b42f5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild