yuceltoluyag · September 3, 2024 21:18 · yuceltoluyag · Sep 3, 2024
diff --git a/pacbac.sh b/pacbac.sh
 #!/bin/bash
 set -euo pipefail

 #------------------------------------------------------------------------------#
 #                                Configuration                                 #
 #------------------------------------------------------------------------------#

 # Default values for command-line arguments.

 REPOS=(core extra community)
 DATE="2024/09/02/"
 ROOT="/"
 SYNC_DB_DIR="/var/lib/pacman/sync/"
 MATCH_THRESHOLD=50
 QUIET=false
 VERBOSE=true

 #------------------------------------------------------------------------------#
 #                                Root Kullanıcı Kontrolü                       #
 #------------------------------------------------------------------------------#

 if [[ $EUID -ne 0 ]]; then
  printf "Error: This script must be run as root. Please use 'sudo' or log in as root.\n" >&2
  exit 1
 fi

 #------------------------------------------------------------------------------#
 #                                Dependency Check                              #
 #------------------------------------------------------------------------------#

 missing_deps=()
 for cmd in bc bsdtar wget; do
  if ! command -v "$cmd" &> /dev/null; then
    missing_deps+=("$cmd")
  fi
 done

 if [[ ${#missing_deps[@]} -ne 0 ]]; then
  printf "Eksik bağımlılıklar bulunuyor: %s\n" "${missing_deps[*]}"

  # Eksik paketleri yükleme
  printf "Eksik paketler yükleniyor...\n"
  if ! pacman -Sy --noconfirm --overwrite "*" "${missing_deps[@]}"; then
    printf "Hata: Eksik bağımlılıkları yükleyemedim. Lütfen manuel olarak yükleyin.\n" >&2
    exit 1
  fi

  printf "Eksik bağımlılıklar başarıyla yüklendi.\n"
 fi

 #------------------------------------------------------------------------------#
 #                                  Functions                                   #
 #------------------------------------------------------------------------------#

 function check_files_db()
 {
  local files_db=$1
  local entry
  local pkg
  local pkgname

  bsdtar -tf "$files_db" | while read entry
  do
    if [[ $entry =~ /files$ ]]
    then
      pkg=${entry%/*}
      pkgname=${pkg%-*-*}
      # Invoke bsdtar in a subshell so that we can update a path counter outside
      # of the loop.
      local match=0
      local number=0
      local path
      local pct
      while read path
      do
        # Skip directories.
        if [[ $path =~ /$ ]]
        then
          continue
        fi
        ((number+=1))
        if [[ -e ${ROOT%/}/$path ]]
        then
          ((match+=1))
        fi
      done < <(bsdtar -Oxf "$files_db" "$entry")
      if [[ $match -gt 0 ]]
      then
        pct=$(bc -l <<< "scale=0; 100 * $match / $number")
        if [[ $pct -gt $MATCH_THRESHOLD ]]
        then
          if $QUIET
          then
            printf "%s\n" "$pkgname"
          else
            printf "%s %s%%\n" "$pkg" "$pct"
          fi
        fi
      fi
    fi
  done
 }

 # Usage: get_files_db <repo> [<yyyy/mm/dd>]
 function get_files_db()
 {
  local repo=$1
  local date=${2:-$DATE}
  local arch=$(uname -m)
  local file_path="${repo}.files"
  local url="https://archive.archlinux.org/repos/$date/$repo/os/$arch/$file_path"

  # Eğer dosya mevcutsa ve güncelse indirmeyi atla
  if [[ -f "$file_path" ]]; then
    local file_date
    file_date=$(date -r "$file_path" +"%Y/%m/%d")
    if [[ "$file_date" == "${date%/}" ]]; then
      if $VERBOSE; then
        printf "Skipping download: %s is already up-to-date.\n" "$file_path"
      fi
      return 0
    fi
  fi

  # Geçici dosya ismi
  local temp_file=$(mktemp /tmp/${repo}.files.XXXXXX)
  
  if $VERBOSE; then
    printf "Downloading %s files database for %s on %s\n" "$repo" "$arch" "$date"
  fi

  # Beklenen dosya boyutunu HTTP başlıklarından al (mevcutsa)
  local expected_size
  expected_size=$(wget --spider "$url" 2>&1 | grep -i "Length:" | awk '{print $2}' || echo "")

  # Dosyayı indir
  if ! wget -O "$temp_file" "$url"; then
    printf "Error: Failed to download %s files database for %s on %s\n" "$repo" "$arch" "$date" >&2
    rm -f "$temp_file"
    return 1
  fi

  # Beklenen dosya boyutunu karşılaştır (eğer biliniyorsa)
  if [[ -n "$expected_size" ]]; then
    local actual_size
    actual_size=$(stat -c%s "$temp_file")

    if [[ "$actual_size" -ne "$expected_size" ]]; then
      printf "Warning: Downloaded file size does not match expected size. The download may be corrupted.\n" >&2
    fi
  fi

  # Geçici dosyayı gerçek dosya ismiyle değiştir
  mv "$temp_file" "$file_path"
 }


 function display_help()
 {
  cat <<HELP
 ABOUT

 This is a tool to help recover the local pacman database. It will check
 installed files against paths in the pacman file databases to estimate which
 package are probably installed on the system. The matches are based entirely on
 matching file paths.

 For each package, the percent of matching files is calculated. If it meets the
 threshold, the package is printed to stdout.

 The list of matching packages is only a starting point for
 recovering the local database. Some packages include the same paths so the user
 will have to determine which of the matches, if any, are likely to be installed
 on the system. Also note that no information about the install reason can be
 determined by matching paths. It is up to the user to figure out which packages
 were installed explicitly and which were installed as dependencies.

 Also note that if the installed version of a package does not match the version
 in the file database, then all paths that contain the version number
 (e.g. /usr/lib/foo-xx.xx/...) will fail to match. It is therefore important to
 determine which file database matches the installed files.

 Local file databases in the sync directory (/var/lib/pacman/sync by default)
 will be consulted first if they exist as they are likely to correspond to the
 installed version if everything was synchronized together (pacman -Syu; pacman
 -Fy). This can be disabled by passing an empty path to the "-s" option.

 If the local file databases do not exist, or the check is disabled, an attempt
 will be made to download the file database from the Arch Linux Archive
 (https://archive.archlinux.org/repos/). A date may be given in the format
 yyyy/mm/dd to select a specific date, otherwise the current date will be used.
 If you know the date of your last system upgrade (even approximately), pass it
 with the "-d" option.


 USAGE

  ${0} [options] [repo repo ...]

 If no repos are given, the following will be checked: ${REPOS[@]}


 OPTIONS

  -d yyyy/mm/dd
    Set the date for retrieving databases from the Arch Linux Archive.
    Default: $DATE
    Example: -d 2024/09/02

  -r /path/to/root
    The system root in which to match packages.
    Default: "/".
    Example: -r /mnt/chroot

  -s /path/to/sync_db/dir
    The path to the pacman sync database directory to query local file
    databases. These are normally downloaded with "pacman -Fy". See the notes
    above about matching database package versions to installed versions. To
    disable local checks, set this to an empty string.
    Default: /var/lib/pacman/sync

  -t <percent>
    The percent of files per package that must exist on the local system for the
    package to match.
    Default: 50

  -q
    Only print package names. This can be used to create an install list that
    can be piped to pacman. E.g.
    ${0} -q | pacman -S -

  -h
    Display this help message.

 HELP
  exit "$1"
 }

 #------------------------------------------------------------------------------#
 #                                     Main                                     #
 #------------------------------------------------------------------------------#

 while getopts 'hd:r:s:t:q' flag
 do
  case "$flag" in
    d) DATE=$OPTARG ;;
    r) ROOT=$OPTARG ;;
    s) SYNC_DB_DIR=$OPTARG ;;
    t) MATCH_THRESHOLD=$OPTARG ;;
    q) QUIET=true ;;
    h) display_help 0 ;;
    *) display_help 1 ;;
  esac
 done

 shift $((OPTIND - 1))
 if [[ $# -gt 0 ]]
 then
  REPOS=("$@")
 fi

 # Create the sync database directory if it doesn't exist
 mkdir -p "$SYNC_DB_DIR"

 # Cleanup temporary files on exit or interrupt
 trap 'rm -f ${REPOS[@]/%/.files}' EXIT INT TERM

 for repo in "${REPOS[@]}"
 do
  files_db=
  if [[ -n $SYNC_DB_DIR ]]
  then
    # Check for local file databases first.
    files_db=${SYNC_DB_DIR%/}/${repo}.files
  fi
  if [[ -z $files_db || ! -e $files_db ]]
  then
    get_files_db "$repo" "$DATE"
    files_db=${repo}.files
  fi
  if $QUIET
  then
    check_files_db "$files_db"
  else
    date -r "$files_db"  +"$files_db %F %R %Z"
    echo '--------------------'
    check_files_db "$files_db"
    echo ''
  fi
 done
	#!/bin/bash
	set -euo pipefail

	#------------------------------------------------------------------------------#
	# Configuration #
	#------------------------------------------------------------------------------#

	# Default values for command-line arguments.

	REPOS=(core extra community)
	DATE="2024/09/02/"
	ROOT="/"
	SYNC_DB_DIR="/var/lib/pacman/sync/"
	MATCH_THRESHOLD=50
	QUIET=false
	VERBOSE=true

	#------------------------------------------------------------------------------#
	# Root Kullanıcı Kontrolü #
	#------------------------------------------------------------------------------#

	if [[ $EUID -ne 0 ]]; then
	printf "Error: This script must be run as root. Please use 'sudo' or log in as root.\n" >&2
	exit 1
	fi

	#------------------------------------------------------------------------------#
	# Dependency Check #
	#------------------------------------------------------------------------------#

	missing_deps=()
	for cmd in bc bsdtar wget; do
	if ! command -v "$cmd" &> /dev/null; then
	missing_deps+=("$cmd")
	fi
	done

	if [[ ${#missing_deps[@]} -ne 0 ]]; then
	printf "Eksik bağımlılıklar bulunuyor: %s\n" "${missing_deps[*]}"

	# Eksik paketleri yükleme
	printf "Eksik paketler yükleniyor...\n"
	if ! pacman -Sy --noconfirm --overwrite "*" "${missing_deps[@]}"; then
	printf "Hata: Eksik bağımlılıkları yükleyemedim. Lütfen manuel olarak yükleyin.\n" >&2
	exit 1
	fi

	printf "Eksik bağımlılıklar başarıyla yüklendi.\n"
	fi

	#------------------------------------------------------------------------------#
	# Functions #
	#------------------------------------------------------------------------------#

	function check_files_db()
	{
	local files_db=$1
	local entry
	local pkg
	local pkgname

	bsdtar -tf "$files_db" \| while read entry
	do
	if [[ $entry =~ /files$ ]]
	then
	pkg=${entry%/*}
	pkgname=${pkg%--}
	# Invoke bsdtar in a subshell so that we can update a path counter outside
	# of the loop.
	local match=0
	local number=0
	local path
	local pct
	while read path
	do
	# Skip directories.
	if [[ $path =~ /$ ]]
	then
	continue
	fi
	((number+=1))
	if [[ -e ${ROOT%/}/$path ]]
	then
	((match+=1))
	fi
	done < <(bsdtar -Oxf "$files_db" "$entry")
	if [[ $match -gt 0 ]]
	then
	pct=$(bc -l <<< "scale=0; 100 * $match / $number")
	if [[ $pct -gt $MATCH_THRESHOLD ]]
	then
	if $QUIET
	then
	printf "%s\n" "$pkgname"
	else
	printf "%s %s%%\n" "$pkg" "$pct"
	fi
	fi
	fi
	fi
	done
	}

	# Usage: get_files_db <repo> [<yyyy/mm/dd>]
	function get_files_db()
	{
	local repo=$1
	local date=${2:-$DATE}
	local arch=$(uname -m)
	local file_path="${repo}.files"
	local url="https://archive.archlinux.org/repos/$date/$repo/os/$arch/$file_path"

	# Eğer dosya mevcutsa ve güncelse indirmeyi atla
	if [[ -f "$file_path" ]]; then
	local file_date
	file_date=$(date -r "$file_path" +"%Y/%m/%d")
	if [[ "$file_date" == "${date%/}" ]]; then
	if $VERBOSE; then
	printf "Skipping download: %s is already up-to-date.\n" "$file_path"
	fi
	return 0
	fi
	fi

	# Geçici dosya ismi
	local temp_file=$(mktemp /tmp/${repo}.files.XXXXXX)

	if $VERBOSE; then
	printf "Downloading %s files database for %s on %s\n" "$repo" "$arch" "$date"
	fi

	# Beklenen dosya boyutunu HTTP başlıklarından al (mevcutsa)
	local expected_size
	expected_size=$(wget --spider "$url" 2>&1 \| grep -i "Length:" \| awk '{print $2}' \|\| echo "")

	# Dosyayı indir
	if ! wget -O "$temp_file" "$url"; then
	printf "Error: Failed to download %s files database for %s on %s\n" "$repo" "$arch" "$date" >&2
	rm -f "$temp_file"
	return 1
	fi

	# Beklenen dosya boyutunu karşılaştır (eğer biliniyorsa)
	if [[ -n "$expected_size" ]]; then
	local actual_size
	actual_size=$(stat -c%s "$temp_file")

	if [[ "$actual_size" -ne "$expected_size" ]]; then
	printf "Warning: Downloaded file size does not match expected size. The download may be corrupted.\n" >&2
	fi
	fi

	# Geçici dosyayı gerçek dosya ismiyle değiştir
	mv "$temp_file" "$file_path"
	}


	function display_help()
	{
	cat <<HELP
	ABOUT

	This is a tool to help recover the local pacman database. It will check
	installed files against paths in the pacman file databases to estimate which
	package are probably installed on the system. The matches are based entirely on
	matching file paths.

	For each package, the percent of matching files is calculated. If it meets the
	threshold, the package is printed to stdout.

	The list of matching packages is only a starting point for
	recovering the local database. Some packages include the same paths so the user
	will have to determine which of the matches, if any, are likely to be installed
	on the system. Also note that no information about the install reason can be
	determined by matching paths. It is up to the user to figure out which packages
	were installed explicitly and which were installed as dependencies.

	Also note that if the installed version of a package does not match the version
	in the file database, then all paths that contain the version number
	(e.g. /usr/lib/foo-xx.xx/...) will fail to match. It is therefore important to
	determine which file database matches the installed files.

	Local file databases in the sync directory (/var/lib/pacman/sync by default)
	will be consulted first if they exist as they are likely to correspond to the
	installed version if everything was synchronized together (pacman -Syu; pacman
	-Fy). This can be disabled by passing an empty path to the "-s" option.

	If the local file databases do not exist, or the check is disabled, an attempt
	will be made to download the file database from the Arch Linux Archive
	(https://archive.archlinux.org/repos/). A date may be given in the format
	yyyy/mm/dd to select a specific date, otherwise the current date will be used.
	If you know the date of your last system upgrade (even approximately), pass it
	with the "-d" option.


	USAGE

	${0} [options] [repo repo ...]

	If no repos are given, the following will be checked: ${REPOS[@]}


	OPTIONS

	-d yyyy/mm/dd
	Set the date for retrieving databases from the Arch Linux Archive.
	Default: $DATE
	Example: -d 2024/09/02

	-r /path/to/root
	The system root in which to match packages.
	Default: "/".
	Example: -r /mnt/chroot

	-s /path/to/sync_db/dir
	The path to the pacman sync database directory to query local file
	databases. These are normally downloaded with "pacman -Fy". See the notes
	above about matching database package versions to installed versions. To
	disable local checks, set this to an empty string.
	Default: /var/lib/pacman/sync

	-t <percent>
	The percent of files per package that must exist on the local system for the
	package to match.
	Default: 50

	-q
	Only print package names. This can be used to create an install list that
	can be piped to pacman. E.g.
	${0} -q \| pacman -S -

	-h
	Display this help message.

	HELP
	exit "$1"
	}

	#------------------------------------------------------------------------------#
	# Main #
	#------------------------------------------------------------------------------#

	while getopts 'hd:r:s:t:q' flag
	do
	case "$flag" in
	d) DATE=$OPTARG ;;
	r) ROOT=$OPTARG ;;
	s) SYNC_DB_DIR=$OPTARG ;;
	t) MATCH_THRESHOLD=$OPTARG ;;
	q) QUIET=true ;;
	h) display_help 0 ;;
	*) display_help 1 ;;
	esac
	done

	shift $((OPTIND - 1))
	if [[ $# -gt 0 ]]
	then
	REPOS=("$@")
	fi

	# Create the sync database directory if it doesn't exist
	mkdir -p "$SYNC_DB_DIR"

	# Cleanup temporary files on exit or interrupt
	trap 'rm -f ${REPOS[@]/%/.files}' EXIT INT TERM

	for repo in "${REPOS[@]}"
	do
	files_db=
	if [[ -n $SYNC_DB_DIR ]]
	then
	# Check for local file databases first.
	files_db=${SYNC_DB_DIR%/}/${repo}.files
	fi
	if [[ -z $files_db \|\| ! -e $files_db ]]
	then
	get_files_db "$repo" "$DATE"
	files_db=${repo}.files
	fi
	if $QUIET
	then
	check_files_db "$files_db"
	else
	date -r "$files_db" +"$files_db %F %R %Z"
	echo '--------------------'
	check_files_db "$files_db"
	echo ''
	fi
	done