$ git clone -n https://src.fedoraproject.org/rpms/xiphos.git /var/lib/mock/f40-build-788347-135103/root/chroot_tmpdir/scmroot/xiphos
Cloning into '/var/lib/mock/f40-build-788347-135103/root/chroot_tmpdir/scmroot/xiphos'...
$ git fetch origin 72f9280926f6a8e452461d208a7caf7063a42739:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xiphos
 * [new ref]         72f9280926f6a8e452461d208a7caf7063a42739 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 72f9280 Rebuild for ICU 74