$ git clone -n https://src.fedoraproject.org/rpms/xstream.git /var/lib/mock/f40-build-2145339-50880/root/chroot_tmpdir/scmroot/xstream
Cloning into '/var/lib/mock/f40-build-2145339-50880/root/chroot_tmpdir/scmroot/xstream'...
$ git fetch origin f582b55fbe5eb90381172ef8de397a5eff5e2c7b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xstream
 * [new ref]         f582b55fbe5eb90381172ef8de397a5eff5e2c7b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f582b55 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild