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#!/bin/sh

# usage: why_dont_you $action $package1 $package2 ...

# investigate, why a certain operation is not done with certain packages

. "${0%/*}/../conf/default.conf"

action="$1"
shift

case "${action}" in

  'build')

    for pkg in "$@"; do
      (
        grep "^$(str_to_regex "${pkg}") " "${work_dir}/build-list" || \
          >&2 printf '"%s" is not on the build list.\n' "${pkg}"
      ) | \
        while read -r package git_revision mod_git_revision repository; do

          if package_locked_or_blocked "${package}" "${git_revision}" "${mod_git_revision}" "${repository}"; then
            printf '"%s" is locked or blocked\n' "${pkg}"
            continue
          fi

          unmet_dependencies=$(find_dependencies_on_build_list "${package}" "${git_revision}" "${mod_git_revision}" "${repository}")
          if [ -n "${unmet_dependencies}" ]; then
            printf '"%s" has unmet dependencies:\n' "${package}"
            echo "${unmet_dependencies}" | \
              while read -r dep; do
                grep -lxF "${dep}" "${work_dir}/package-infos/"*".builds" | \
                  sed '
                    s|^.*/||
                    s|\(\.[^.]\+\)\{4\}||
                  '
              done | \
              sort -u
            printf '\n'

            continue
          fi

          if [ -f "${work_dir}/package-states/${package}.${git_revision}.${mod_git_revision}.${repository}.broken" ]; then
            printf '"%s" is broken (%sx built), but would be built\n' \
              "${pkg}" \
              "$(wc -l < "${work_dir}/package-states/${package}.${git_revision}.${mod_git_revision}.${repository}.broken")"
          else
            printf '"%s" would be built\n' "${pkg}"
          fi
        done

    done

  ;;

  'unstage')

    for pkg in "$@"; do

      if ! ls -1 "${work_dir}/package-states" | \
        grep -q "^$(str_to_regex "${pkg}")\(\.[^.]\+\)\{3\}\.done\$"; then
        printf '"%s" is not in staging!\n' "${pkg}"
        continue
      fi

      dependent_packages=$(
        grep -lxF "${pkg}" "${work_dir}/package-infos/"*".depends" | \
          sed '
            s|^.*/||
            s|\.depends$||
          '
      )

      build_list_items_file=$(mktemp)
      dependent_packages_file=$(mktemp)

      grep -vxF 'break_loops' "${work_dir}/build-list" | \
        awk '{print $1 "." $2 "." $3 "." $4}' | \
        sort -u > \
        "${build_list_items_file}"

      printf '%s\n' "${dependent_packages}" | \
        sort -u > \
        "${dependent_packages_file}"

      dependent_still_on_build_list=$(
        join -1 1 -2 1 -o 1.1 \
          "${build_list_items_file}" \
          "${dependent_packages_file}"
      )

      rm -f \
        "${build_list_items_file}" \
        "${dependent_packages_file}"

      if [ -n "${dependent_still_on_build_list}" ]; then
        printf 'The following packages are dependent on "%s", but still on the build list:\n' "${pkg}"
        echo "${dependent_still_on_build_list}"
        printf '\n'
        continue
      fi

      dependent_still_in_staging=$(
        echo "${dependent_packages}" | \
          while read -r sf; do
            if [ -f "${work_dir}/package-states/${sf}.done" ]; then
              echo "${sf}"
            fi
          done
      )

      if [ -n "${dependent_still_in_staging}" ]; then
        printf 'The following packages are dependent on "%s" and still in staging - maybe they cannot be unstaged:\n' "${pkg}"
        echo "${dependent_still_in_staging}"
        printf '\n'
        continue
      fi

      printf 'Package "%s" can be unstaged.\n' "${pkg}"

    done

  ;;

  'keep')

    tmp_file=$(mktemp)
    trap 'rm -f "${tmp_file}"' EXIT

    while read -r pkg; do

      if builds_file=$(
        ls "${work_dir}/package-infos" | \
          grep -m1 "^$(str_to_regex "${pkg}")\(\.[^.]\+\)\{3\}\.builds\$"
        ); then

        builds_file="${builds_file%.*}"
        prepo="${builds_file##*.}"
        builds_file="${builds_file%.*}"
        mod_rev="${builds_file##*.}"
        builds_file="${builds_file%.*}"
        rev="${builds_file##*.}"

      else

        found_PKGBUILD=false
        mod_rev=$(cat "${work_dir}/archlinux32.revision")
        for repo in ${repo_names}; do
          eval 'repo_path="${repo_paths__'"${repo}"'}"'
          rev=$(cat "${work_dir}/${repo}.revision")
          if [ "${repo}" = 'archlinux32' ]; then
            if git -C "${repo_path}" archive "${mod_rev}" | \
              grep -q "^[^/]\+/$(str_to_regex "${pkg}")/PKGBUILD\$"; then
              prepo=$(
                git -C "${repo_path}" archive "${mod_rev}" | \
                  grep "^[^/]\+/$(str_to_regex "${pkg}")/PKGBUILD\$" | \
                  cut -d/ -f1
              )
              found_PKGBUILD=true
              break
            fi
          else
            prepo=$(
              git -C "${repo_path}" archive "${rev}" -- "${pkg}/repos" 2>/dev/null | \
                tar -t 2> /dev/null | \
                grep '^[^/]\+/repos/[^/]\+/PKGBUILD$' | \
                grep -v -- '-i686/PKGBUILD$' | \
                grep -v -- '[-/]\(staging\|testing\|unstable\)-[^/]\+/PKGBUILD$' | \
                sed '
                  s|^[^/]\+/repos/\([^/]\+\)-[^/-]\+/PKGBUILD$|\1|
                ' | \
                head -n1
            )
            if [ -n "${prepo}" ]; then
              found_PKGBUILD=true
              break
            fi
          fi
        done
        if ! ${found_PKGBUILD}; then
          continue
        fi

        generate_package_metadata "${pkg}" "${rev}" "${mod_rev}" "${prepo}"

      fi

      sed "s|^|${pkg} builds |" "${work_dir}/package-infos/${pkg}.${rev}.${mod_rev}.${prepo}.builds" >> \
        "${tmp_file}"

    done < \
      "${work_dir}/deletion-list"

    sort -k3,3 "${tmp_file}" | \
      sponge "${tmp_file}"

    for pkg in "$@"; do

      if ! grep -qxF "${pkg}" "${work_dir}/deletion-list"; then
        printf 'Package "%s" is not on the deletion list.\n' "${pkg}"
        continue
      fi

      if git -C "${repo_paths__archlinux32}" archive "$(cat "${work_dir}/archlinux32.revision")" -- blacklist | \
        tar -Ox 'blacklist' | \
        grep -qxF "${pkg}"; then
        printf 'Package "%s" is explicitely blacklisted.\n' "${pkg}"
        continue
      fi

      if [ "lib32-${pkg#lib32-}" = "${pkg}" ]; then
        printf 'Package "%s" is a library from multilib.\n' "${pkg}"
        continue
      fi

      if ! needs=$(
          ls "${work_dir}/package-infos" | \
            grep "^$(str_to_regex "${pkg}")\..*\.needs\$"
        ); then
        printf 'Package "%s" was deleted in the git repositories.\n' "${pkg}"
        continue
      fi

      needs=$(
        printf "${work_dir}/package-infos/%s\n" ${needs} | \
          xargs -r cat | \
          sort -u
      )

      errors=$(
        (
          printf '%s\n' ${needs}
          awk '{print $3}' "${tmp_file}" | \
            sort -u
        ) | \
          sort | \
          uniq -d | \
          join -1 1 -2 3 -o 2.1,2.2,2.3 - "${tmp_file}"
      )
      if [ -n "${errors}" ]; then
        printf 'Package "%s" has dependencies on the deletion list:\n' "${pkg}"
        printf '%s %s %s\n' ${errors}
        printf '\n'
        continue
      fi

      printf 'It seems, package "%s" should not be deleted.\n' "${pkg}"

    done

  ;;

  *)
    >&2 printf 'unknown action "%s"\n' "${action}"
    exit 1

esac