$ git clone -n https://src.fedoraproject.org/rpms/rust-gstreamer-app.git /var/lib/mock/f45-build-42218-791/root/chroot_tmpdir/scmroot/rust-gstreamer-app
Cloning into '/var/lib/mock/f45-build-42218-791/root/chroot_tmpdir/scmroot/rust-gstreamer-app'...
$ git fetch origin e587a00087b81f30a5132edb76e2fd91a43b198b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gstreamer-app
 * [new ref]         e587a00087b81f30a5132edb76e2fd91a43b198b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e587a00 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild