$ git clone -n https://src.fedoraproject.org/rpms/php.git /var/lib/mock/f42-build-865101-172791/root/chroot_tmpdir/scmroot/php
Cloning into '/var/lib/mock/f42-build-865101-172791/root/chroot_tmpdir/scmroot/php'...
$ git fetch origin 28a512675bcf3558978076f69dccfa3c2e9cbcaf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/php
 * [new ref]         28a512675bcf3558978076f69dccfa3c2e9cbcaf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 28a5126 v8.4.3RC1