$ git clone -n https://src.fedoraproject.org/rpms/anaconda.git /var/lib/mock/f43-build-side-114655-60946082-6586586/root/chroot_tmpdir/scmroot/anaconda
Cloning into '/var/lib/mock/f43-build-side-114655-60946082-6586586/root/chroot_tmpdir/scmroot/anaconda'...
$ git fetch origin 780b18c9e67dce4af18c04b32389b7fdac4b8593:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/anaconda
 * [new ref]         780b18c9e67dce4af18c04b32389b7fdac4b8593 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 780b18c Update to 43.28 upstream release