$ git clone -n https://src.fedoraproject.org/rpms/gstreamer1-plugin-openh264.git /var/lib/mock/f42-build-3419574-45162/root/chroot_tmpdir/scmroot/gstreamer1-plugin-openh264
Cloning into '/var/lib/mock/f42-build-3419574-45162/root/chroot_tmpdir/scmroot/gstreamer1-plugin-openh264'...
$ git fetch origin 8bf05714c8b73559462c09c3c19d55248f497e88:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gstreamer1-plugin-openh264
 * [new ref]         8bf05714c8b73559462c09c3c19d55248f497e88 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8bf0571 Added as a subpackage of gstreamer1-plugins-bad-free instead