generate_unstable_mask

#!/bin/bash
# Copyright (c) 2024 The Flatcar Maintainers.
# Distributed under the terms of the GNU General Public License v2

# Generates a package.mask file clamping back an architecture with unstable
# keywords (e.g. riscv) to roughly the same package versions as amd64-usr, which
# has stable keywords.

set -euo pipefail

export PORTAGE_CONFIGROOT=/build/${1-none}

if [[ ! -d ${PORTAGE_CONFIGROOT} ]]; then
  echo "Usage: $0 <BOARD>" >&2
  exit 1
fi

cd "$(portageq get_repo_path / portage-stable)"

find * -maxdepth 3 -name "*.ebuild" -printf "%h\0" | sort -z -u | xargs -P16 -0 -i sh -ec '
  PKG="{}"

  # This will fail, skipping this package, if there is no amd64-usr ebuild,
  # which is fine because there is nothing to mask in this case.
  BEST_STABLE=$(PORTAGE_CONFIGROOT=/build/amd64-usr portageq best_visible /build/amd64-usr ebuild "${PKG}")

  if ! BEST_UNSTABLE=$(portageq best_visible / ebuild "${PKG}"); then
    echo "# ${PKG} is not keyworded for this architecture." >&2
  fi

  # Do not bother masking if the best versions match.
  [ "${BEST_UNSTABLE}" = "${BEST_STABLE}" ] && exit

  # Check if there is a keyworded ebuild at the same version or lower. If so,
  # mask higher versions. If not, do not mask, allowing the best unstable.
  portageq best_visible "${PORTAGE_CONFIGROOT}" ebuild "<=${BEST_STABLE}" >/dev/null
  echo ">${BEST_STABLE}"
' | sort