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 #!/bin/bash
 # Point apt at a mirror near the runner, when the runner fleet names one.
 #
 # archive.ubuntu.com is reachable but slow from some networks: measured from CERN
 # it served ~48 kB/s against ~1.9 MB/s for the Swiss mirror, which made an
 # apt-get the longest step in jobs that were not otherwise network-bound.
 #
 # The mirror URL is NOT hardcoded here, because the right answer depends on where
 # the job is running and this repository cannot know that. Self-hosted fleets
 # export HUSK_UBUNTU_APT_MIRROR into the job container; GitHub-hosted runners do
 # not set it, and then this script does nothing at all. That keeps the knowledge
 # in the one place that has it, and keeps the hosted path provably unchanged.
 #
 # The UBUNTU in the name is load-bearing: a distribution mirror is only valid for
 # the distribution whose suites it carries. Pointing a Debian image at an Ubuntu
 # mirror does not degrade to slow, it 404s, because the suite names do not overlap
 # (bookworm vs noble). The gate below enforces that rather than leaving it to the
 # rewrite patterns to happen to miss.
 #
 # Safe to run more than once, on any image: it edits only lines that still point
 # at the upstream archive.
 
 set -u
 
 if [ -z "${HUSK_UBUNTU_APT_MIRROR:-}" ]; then
   # Exiting mute is right for a hosted runner, which is never expected to name a
   # mirror. On a self-hosted slot it is a misconfiguration whose only other
   # symptom is an unexplained slow apt-get, so leave a trace to grep for.
   if [ "${RUNNER_ENVIRONMENT:-}" = "self-hosted" ]; then
     echo "apt mirror: HUSK_UBUNTU_APT_MIRROR unset on a self-hosted runner, using upstream archive"
   fi
   exit 0
 fi
 
 command -v apt-get > /dev/null 2>&1 || exit 0
 
 # Debian and its derivatives all ship apt, so apt-get is not evidence of Ubuntu.
 # Absent os-release, skip: an unidentifiable image is not one to rewrite blind.
 distro=""
 if [ -r /etc/os-release ]; then
   # shellcheck disable=SC1091
   distro=$(. /etc/os-release && echo "${ID:-}")
 fi
 if [ "$distro" != "ubuntu" ]; then
   echo "apt mirror: skipping, distro is '${distro:-unknown}', not ubuntu"
   exit 0
 fi
 
 if command -v sudo > /dev/null 2>&1; then SUDO="sudo"; else SUDO=""; fi
 
 # 24.04 uses deb822 (sources.list.d/*.sources); older images use sources.list.
 # Rewrite whichever exist, and both hosts: the country mirrors carry -security
 # too, so leaving security.ubuntu.com alone would leave half the fetch slow.
 #
 # ports.ubuntu.com (arm64 and friends) is deliberately NOT rewritten: the country
 # mirrors that carry the x86 archive frequently do not carry ports, so redirecting
 # it would break rather than speed up a non-x86 job.
 changed=0
 for f in /etc/apt/sources.list /etc/apt/sources.list.d/*.sources \
   /etc/apt/sources.list.d/*.list; do
   [ -f "$f" ] || continue
   # One expression per scheme rather than `https\?://`: that is a GNU extension,
   # and silently matching nothing is the worst failure mode here — the job would
   # simply stay slow with no error to notice.
   before=$($SUDO cat "$f")
   $SUDO sed -i \
     -e "s|http://archive\.ubuntu\.com/ubuntu|${HUSK_UBUNTU_APT_MIRROR}|g" \
     -e "s|https://archive\.ubuntu\.com/ubuntu|${HUSK_UBUNTU_APT_MIRROR}|g" \
     -e "s|http://security\.ubuntu\.com/ubuntu|${HUSK_UBUNTU_APT_MIRROR}|g" \
     -e "s|https://security\.ubuntu\.com/ubuntu|${HUSK_UBUNTU_APT_MIRROR}|g" \
     "$f"
   [ "$before" = "$($SUDO cat "$f")" ] || changed=$((changed + 1))
 done
 
 # Report what actually happened. An unconditional success line would hide the
 # case this script most needs to surface: the mirror was named, the image is
 # ubuntu, and yet nothing matched — meaning the sources are in a form we do not
 # recognise and the job is silently still on the slow path.
 if [ "$changed" -gt 0 ]; then
   echo "apt mirror set to ${HUSK_UBUNTU_APT_MIRROR} (${changed} source file(s) rewritten)"
 else
   echo "apt mirror: ${HUSK_UBUNTU_APT_MIRROR} named, but no upstream archive URLs found to rewrite"
 fi

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