$ git clone -n https://src.fedoraproject.org/rpms/squid.git /var/lib/mock/f45-build-36385-704/root/chroot_tmpdir/scmroot/squid
Cloning into '/var/lib/mock/f45-build-36385-704/root/chroot_tmpdir/scmroot/squid'...
$ git fetch origin 4ae52f4fcd816fc93159b8562d175a8a43edb40a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/squid
 * [new ref]         4ae52f4fcd816fc93159b8562d175a8a43edb40a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4ae52f4 new version 7.6