$ git clone -n https://src.fedoraproject.org/rpms/im-chooser.git /var/lib/mock/f40-build-2004640-44976/root/chroot_tmpdir/scmroot/im-chooser
Cloning into '/var/lib/mock/f40-build-2004640-44976/root/chroot_tmpdir/scmroot/im-chooser'...
$ git fetch origin 8410c7d5029873a232232194ab87a3f3887dd352:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/im-chooser
 * [new ref]         8410c7d5029873a232232194ab87a3f3887dd352 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8410c7d Update deps