$ git clone -n https://src.fedoraproject.org/rpms/subversion.git /var/lib/mock/f39-build-1869183-42620/root/chroot_tmpdir/scmroot/subversion
Cloning into '/var/lib/mock/f39-build-1869183-42620/root/chroot_tmpdir/scmroot/subversion'...
$ git fetch origin 75534963a4b0f634befa5fa80d457d5239be1308:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/subversion
 * [new ref]         75534963a4b0f634befa5fa80d457d5239be1308 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7553496 fix mod_authz_svn, mod_dontdothat (#2250182)