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#!/bin/bash

provided=$(mktemp)

sources=(
  /var/lib/pacman/sync
  /mnt/archlinux/archlinux
  /mnt/archlinux
)

sudo pacman -Sy >/dev/null || exit $?

for i in "${!sources[@]}"; do
  find "${sources["${i}"]}" -name '*.db' \
    -exec bsdtar -Oxzf {} \; \
  2>/dev/null \
  | sed -n '
    /^%\(NAME\|VERSION\)%$/ {
      N
      s/\n/ /
      p
    }
    /^%PROVIDES%$/,/^$/ {
      /^[^%]/ p
    }
  ' \
  | sed -n '
    s/^\(\S\+\)=\(\S\+\)-\(64\|32\)$/\2 \1/
    T no_provides
    p
    d
    :no_provides
    /^%NAME%/ {
      N
      s/^%NAME% \(\S\+\)\n%VERSION% \(\S\+\)-\S\+$/\2 \1/
      T
      p
    }
  ' \
  | sed '
    /^\(\S\+\) \1$/d
    s/^/'"${i}"' /
  '
done \
| sort -k3,3 -k1n,1 -k2Vr,2 \
| uniq -f2 \
| cut -d' ' -f2,3 \
>"${provided}"

printf '%s\n' "${provided}"