$ git clone -n https://src.fedoraproject.org/rpms/z3.git /var/lib/mock/f39-build-2261626-54427/root/chroot_tmpdir/scmroot/z3
Cloning into '/var/lib/mock/f39-build-2261626-54427/root/chroot_tmpdir/scmroot/z3'...
$ git fetch origin f87466ebb02f7af117adb86ca589ce31c4cce61e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/z3
 * [new ref]         f87466ebb02f7af117adb86ca589ce31c4cce61e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f87466e Fix python package library load name (bz 2255464)