$ git clone -n https://src.fedoraproject.org/rpms/rust-gst-plugin-fmp4.git /var/lib/mock/f42-build-3262668-41241/root/chroot_tmpdir/scmroot/rust-gst-plugin-fmp4
Cloning into '/var/lib/mock/f42-build-3262668-41241/root/chroot_tmpdir/scmroot/rust-gst-plugin-fmp4'...
$ git fetch origin af1ca9654fc380908b993f2b0d60fda65cffe6c8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gst-plugin-fmp4
 * [new ref]         af1ca9654fc380908b993f2b0d60fda65cffe6c8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at af1ca96 Initial import (rhbz#2342461)