$ git clone -n https://src.fedoraproject.org/rpms/gjs.git /var/lib/mock/f39-build-2232181-53323/root/chroot_tmpdir/scmroot/gjs
Cloning into '/var/lib/mock/f39-build-2232181-53323/root/chroot_tmpdir/scmroot/gjs'...
$ git fetch origin 5aa92c7344591a7a196170694483e45cf21bd753:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gjs
 * [new ref]         5aa92c7344591a7a196170694483e45cf21bd753 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5aa92c7 Update to 1.78.2