Actually Build Squid 6

In order to get Squid 6 on Ubuntu 22.04 LTS we will use the original version from Debian Unstable Repository. Run script 03_build_squid.sh to do the compilation.

#!/bin/bash

if [[ $EUID -eq 0 ]]; then
   echo "This script must NOT be run as root" 1>&2
   exit 1
fi

# drop squid build folder
rm -R build/squid

# we will be working in a subfolder make it
mkdir -p build/squid

# set squid version
source squid.ver

# copy the patches to working directory
# cp control.patch build/squid/
cp BoolOps.cc.patch build/squid/

# decend into working directory
pushd build/squid

# get squid from debian experimental
wget http://http.debian.net/debian/pool/main/s/squid/squid_${SQUID_PKG}.dsc
wget http://http.debian.net/debian/pool/main/s/squid/squid_${SQUID_VER}.orig.tar.xz
wget http://http.debian.net/debian/pool/main/s/squid/squid_${SQUID_VER}.orig.tar.xz.asc
wget http://http.debian.net/debian/pool/main/s/squid/squid_${SQUID_PKG}.debian.tar.xz

# unpack the source package
dpkg-source -x squid_${SQUID_PKG}.dsc

# patch the opts
# patch squid-${SQUID_VER}/debian/control < control.patch
patch squid-${SQUID_VER}/src/acl/BoolOps.cc < BoolOps.cc.patch

# build the package
cd squid-${SQUID_VER} && dpkg-buildpackage -rfakeroot -b -us -uc

# and revert
popd

squid.ver file is just to easier manage Squid versions in script.

#!/usr/bin/env bash

# set squid version
SQUID_VER="6.9"
SQUID_PKG="${SQUID_VER}-1"

control.patch is small patch file that allows sources of squid package from Debian 12 to be built on Ubuntu 22.04.

--- control.old 2022-10-12 10:24:13.396181441 +0000
+++ control 2022-10-12 10:24:35.228069617 +0000
@@ -13,7 +13,7 @@
 # The compiler dependencies are relevant for backporting.
    , g++ (>= 4.9) <!cross> | clang (>= 3.7) <!cross>
    , gcc (>= 4.9) <!cross> | clang (>= 3.7) <!cross>
-   , debhelper-compat (= 13)
+   , debhelper-compat (= 12)
     , lsb-release
    , dh-apparmor
    , libcppunit-dev

BoolOps.cc.patch is a patch file that changes some minor c++ code to allow compiling using gcc version present in Ubuntu 22.04.

--- BoolOps.cc  2023-07-06 05:15:40.000000000 +0000
+++ BoolOps.cc.new  2023-07-11 16:12:35.904802697 +0000
@@ -17,7 +17,7 @@
 Acl::NotNode::NotNode(ACL *acl)
 {
     assert(acl);
-    Must(strlen(acl->name) <= sizeof(name)-2);
+    //Must(strlen(acl->name) <= sizeof(name)-2);
     name[0] = '!';
     name[1] = '\0';
     xstrncpy(&name[1], acl->name, sizeof(name)-1); // -1 for '!'

After build is successful, run script 04_install_squid.sh to install Squid.

#!/bin/bash

if [[ $EUID -ne 0 ]]; then
   echo "This script must be run as root" 1>&2
   exit 1
fi

# set squid version
source squid.ver

# decend into working directory
pushd build/squid

# install squid packages
sudo apt-get install squid-langpack
dpkg --install squid-common_${SQUID_PKG}_all.deb
dpkg --install squid-openssl_${SQUID_PKG}_amd64.deb
dpkg --install squidclient_${SQUID_PKG}_amd64.deb

# and revert
popd

# verify the installed squid binary
systemctl stop squid && systemctl start squid && systemctl status squid && /usr/sbin/squid -v