Backup /var/cache/apt/archives Menjadi Repo Lokal

#!/usr/bin/env bash

#set -x

: <<'COMMENT'
_Well, internet is expensive_. Sayang rasanya jika paket yang telah diunduh
dihapus begitu saja.

_Script_ ini akan mencadangkan paket unduhan dalam /var/cache/apt/archives
ke tempat yang ditentukan (sesuai pengaturan local_mir) dengan hierarki sesuai
_mirror_ dan dapat digunakan sebagai _source_ bagi debootstrap.

Sebenarnya ada apt-move untuk tugas ini, namun ia memiliki _bug_ yang membuatnya
gagal bekerja dan tiada yang sudi memperbaiki.

So, here you go ...

deps: apt-utils untuk menyediakan apt-ftparchive
COMMENT

## variables -------------------------------------------------------------------

## sesuaikan local_mir dengan path local mirror
local_mir=~/Software/mirrors/debian
src_list=/etc/apt/sources.list
deb_dir=/var/cache/apt/archives
temp_dir=/tmp/repo_$(date +%F_%H-%M-%S)

## functions -------------------------------------------------------------------

print_help() {

  printf "%s\n" '

  Penggunaan:   repo COMMAND

  Commands:
    edit        - sunting /etc/apt/sources.list
    local       - gunakan repository lokal
    online      - gunakan repository online
    copy        - salin paket dari cache ke repo lokal
    move        - pindahkan paket dari cache ke repo lokal
    remove      - buang paket yang tidak ada dalam mirror

  '
  exit

}

cp_deb_to_repo() {
  while IFS= read -r lists
  do
    echo "$lists"
    lists_deb="${lists//_/\/}"
    mkdir -p "$local_mir/${lists_deb/\/Packages/}"
    cp -vT /var/lib/apt/lists/"$lists" "$local_mir/$lists_deb"
    find "$deb_dir" -type f -name "*.deb" -printf '%P\n' > "$temp_dir"/in_cache
    awk '/Filename/{print $2}' /var/lib/apt/lists/"$lists" > "$temp_dir"/in_mirror
    cd "$local_mir/${lists_deb%%dists*}" || exit
    while read -r paket; do
      mkdir -p "${paket%/*}"
      cp -v "$deb_dir/${paket##*/}" "${paket%/*}"
    done < <(grep -Fwf "$temp_dir/in_cache" "$temp_dir/in_mirror")
  done < <(find /var/lib/apt/lists -type f -iname "*amd64_Packages" -printf '%P\n')
}

buat_release() {
  while IFS= read -r pkglist
  do
    gzip -9c > "$pkglist.gz" < "$pkglist"
    echo "Architectures: amd64
  Codename: sid
  Components: main contrib non-free
  Description: Repo lokal
  Label: Debian
  Origin: Debian
  Suite: unstable" > "${pkglist%%/binary*}"/../Release
    apt-ftparchive release "${pkglist%%/binary*}"/.. >> "${pkglist%%/binary*}"/../Release
  done < <(find "$local_mir" -type f -iname "Packages")
}

use_local() {
  sudo sed -i '/^deb http/s/^deb http/#deb http/g' "$src_list"
}

use_online() {
  sudo sed -i '/^#deb http/s/^#deb http/deb http/g' "$src_list"
}

remove_old() {
  while IFS= read -r deblist
  do
    find "$deblist"/../dists/ -type f -name Packages -print0 | xargs -0 awk '/Filename/{print $2}' > "$temp_dir/in_mirror"  
    find "$deblist"/ -type f -name "*.deb" > "$temp_dir/exist"
    grep -v -F -f "$temp_dir/in_mirror" "$temp_dir/exist" | xargs -I '{}' mv -v {} /tmp
  done <  <(find "$local_mir" -type d -iname "pool")
}

## main ------------------------------------------------------------------------

[[ ! -f $(which apt-ftparchive) ]] && exit
mkdir -p "$temp_dir"

case "$1" in
  edit)
    sudo nano /etc/apt/sources.list
  ;;
  clean)
    cp_deb_to_repo
    buat_release
    remove_old
    buat_release
    sudo aptitude clean
  ;;
  copy)
    cp_deb_to_repo
    buat_release
  ;;
  local)
    use_local
  ;;
  move)
    cp_deb_to_repo
    buat_release
    sudo aptitude clean
  ;;
  online)
    use_online
  ;;
  remove)
    remove_old
    buat_release
  ;;
  *)
    print_help
  ;;
esac

rm -r "$temp_dir"