$ git clone -n https://src.fedoraproject.org/rpms/gstreamer1-plugins-good.git /var/lib/mock/f39-build-1665783-40755/root/chroot_tmpdir/scmroot/gstreamer1-plugins-good
Cloning into '/var/lib/mock/f39-build-1665783-40755/root/chroot_tmpdir/scmroot/gstreamer1-plugins-good'...
$ git fetch origin 5418d5b32e3804808bf054783f80e4e4f50d60e9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gstreamer1-plugins-good
 * [new ref]         5418d5b32e3804808bf054783f80e4e4f50d60e9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5418d5b Rebuild (qt6)