$ git clone -n https://src.fedoraproject.org/rpms/log4cxx.git /var/lib/mock/f41-build-side-1-2812348-32940/root/chroot_tmpdir/scmroot/log4cxx
Cloning into '/var/lib/mock/f41-build-side-1-2812348-32940/root/chroot_tmpdir/scmroot/log4cxx'...
$ git fetch origin 9027b75dd60d01ac917efec66014520e86dec953:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/log4cxx
 * [new ref]         9027b75dd60d01ac917efec66014520e86dec953 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9027b75 Update to 1.2.0