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+#!/bin/bash
+#
+# pacache - flexible pacman cache cleaning
+#
+# Copyright (C) 2011 Dave Reisner <dreisner@archlinux.org>
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+
+shopt -s extglob
+
+declare -a candidates=() cmdopts=() whitelist=() blacklist=()
+declare -i delete=0 dryrun=0 filecount=0 keep=3 move=0 totalsaved=0
+declare cachedir=@localstatedir@/cache/pacman/pkg delim=$'\n' movedir= scanarch=
+
+msg() {
+ local mesg=$1; shift
+ printf "==> $mesg\n" "$@"
+} >&2
+
+error() {
+ local mesg=$1; shift
+ printf "==> ERROR: $mesg\n" "$@"
+} >&2
+
+die() {
+ error "$@"
+ exit 1
+}
+
+# reads a list of files on stdin and prints out deletion candidates
+pkgfilter() {
+ # there's whitelist and blacklist parameters passed to this
+ # script after the block of awk.
+
+ awk -v keep="$1" -v scanarch="$2" '
+ function parse_filename(filename, parts, count, i, pkgname, arch) {
+
+ count = split(filename, parts, "-")
+
+ i = 1
+ pkgname = parts[i++]
+ while (i <= count - 3) {
+ pkgname = pkgname "-" parts[i++]
+ }
+
+ arch = substr(parts[count], 1, index(parts[count], ".") - 1)
+
+ # filter on whitelist or blacklist
+ if (wlen && !whitelist[pkgname]) return
+ if (blen && blacklist[pkgname]) return
+
+ if ("" == packages[pkgname,arch]) {
+ packages[pkgname,arch] = filename
+ } else {
+ packages[pkgname,arch] = packages[pkgname,arch] SUBSEP filename
+ }
+ }
+
+ BEGIN {
+ # create whitelist
+ wlen = ARGV[1]; delete ARGV[1]
+ for (i = 2; i < 2 + wlen; i++) {
+ whitelist[ARGV[i]] = 1
+ delete ARGV[i]
+ }
+
+ # create blacklist
+ blen = ARGV[i]; delete ARGV[i]
+ while (i++ < ARGC) {
+ blacklist[ARGV[i]] = 1
+ delete ARGV[i]
+ }
+
+ # read package filenames
+ while (getline < "/dev/stdin") {
+ parse_filename($0)
+ }
+ }
+
+ END {
+ for (pkglist in packages) {
+ # idx[1,2] = idx[pkgname,arch]
+ split(pkglist, idx, SUBSEP)
+
+ # enforce architecture match if specified
+ if (!scanarch || scanarch == idx[2]) {
+ count = split(packages[idx[1], idx[2]], pkgs, SUBSEP)
+ if (count > keep) {
+ for(i = 1; i <= count - keep; i++) {
+ print pkgs[i]
+ }
+ }
+ }
+ }
+ }' "${@:3}"
+}
+
+size_to_human() {
+ awk -v size="$1" '
+ BEGIN {
+ suffix[1] = "KiB"
+ suffix[2] = "MiB"
+ suffix[3] = "GiB"
+ suffix[4] = "TiB"
+ count = 1
+
+ while (size > 1024) {
+ size /= 1024
+ count++
+ }
+
+ sizestr = sprintf("%.2f", size)
+ sub(/.?0+$/, "", sizestr)
+ printf("%s %s", sizestr, suffix[count])
+ }'
+}
+
+runcmd() {
+ if (( needsroot )); then
+ msg "Privilege escalation required"
+ if sudo -v &>/dev/null && sudo -l &>/dev/null; then
+ sudo "$@"
+ else
+ printf '%s ' 'root'
+ su -c "$(printf '%q ' "$@")"
+ fi
+ else
+ "$@"
+ fi
+}
+
+summarize() {
+ local -i filecount=$#
+ local seenarch= seen= arch= name=
+ local -r pkg_re='(.+)-[^-]+-[0-9]+-([^.]+)\.pkg.*'
+
+ if (( delete )); then
+ printf -v output 'finished: %d packages removed' "$filecount"
+ elif (( move )); then
+ printf -v output "finished: %d packages moved to \`%s'" "$filecount" "$movedir"
+ elif (( dryrun )); then
+ if (( verbose )); then
+ msg "Candidate packages:"
+ while read -r pkg; do
+ if (( verbose >= 3 )); then
+ [[ $pkg =~ $pkg_re ]] && name=${BASH_REMATCH[1]} arch=${BASH_REMATCH[2]}
+ if [[ -z $seen || $seenarch != $arch || $seen != $name ]]; then
+ printf '%s (%s):\n' "$name" "$arch"
+ fi
+ printf ' %s\n' "$pkg"
+ elif (( verbose >= 2 )); then
+ printf "$PWD/%s$delim" "$pkg"
+ else
+ printf "%s$delim" "$pkg"
+ fi
+ done < <(printf '%s\n' "$@" | sort -V)
+ printf '\n' >&2
+ fi
+
+ printf -v output 'finished dry run: %d candidates' "$filecount"
+ fi
+
+ msg "$output (diskspace saved: %s)" "$(size_to_human "$totalsaved")"
+}
+
+usage() {
+ cat <<EOF
+usage: ${0##*/} <operation> [options] [targets...]
+
+${0##*/} is a flexible pacman cache cleaning utility, which has numerous
+options to help control how much, and what, is deleted from any directory
+containing pacman package tarballs.
+
+ Operations:
+ -d perform a dry run, only finding candidate packages.
+ -m <movedir> move candidate packages to 'movedir'.
+ -r remove candidate packages.
+
+ Options:
+ -a <arch> scan for 'arch' (default: all architectures).
+ -c <cachedir> scan 'cachedir' for packages (default: @localstatedir@/cache/pacman/pkg).
+ -f apply force to mv(1) and rm(1) operations.
+ -h display this help message.
+ -i <pkgs> ignore 'pkgs', which is a comma separated. Alternatively,
+ specify '-' to read package names from stdin, newline delimited.
+ -k <num> keep 'num' of each package in 'cachedir' (default: 3).
+ -u target uninstalled packages.
+ -v increase verbosity. specify up to 3 times.
+ -z use null delimiters for candidate names (only with -v and -vv)
+
+EOF
+}
+
+if (( ! UID )); then
+ error "Bad dog, no biscuit. You will be prompted for privilege escalation."
+ exit 42
+fi
+
+while getopts ':a:c:dfhi:k:m:rsuvz' opt; do
+ case $opt in
+ a) scanarch=$OPTARG ;;
+ c) cachedir=$OPTARG ;;
+ d) dryrun=1 ;;
+ f) cmdopts=(-f) ;;
+ h) usage
+ exit 0 ;;
+ i) if [[ $OPTARG = '-' ]]; then
+ [[ ! -t 0 ]] && IFS=$'\n' read -r -d '' -a ign
+ else
+ IFS=',' read -r -a ign <<< "$OPTARG"
+ fi
+ blacklist+=("${ign[@]}")
+ unset i ign ;;
+ k) keep=$OPTARG
+ if [[ $keep != $OPTARG ]] || (( keep < 0 )); then
+ die 'argument to option -k must be a non-negative integer'
+ fi ;;
+ m) move=1 movedir=$OPTARG ;;
+ r) delete=1 ;;
+ u) IFS=$'\n' read -r -d '' -a ign < <(pacman -Qq)
+ blacklist+=("${ign[@]}")
+ unset ign ;;
+ v) (( ++verbose )) ;;
+ z) delim='\0' ;;
+ :) die "option '--%s' requires an argument" "$OPTARG" ;;
+ ?) die "invalid option -- '%s'" "$OPTARG" ;;
+ esac
+done
+shift $(( OPTIND - 1 ))
+
+# remaining args are a whitelist
+whitelist=("$@")
+
+# sanity checks
+case $(( dryrun+delete+move )) in
+ 0) die "no operation specified (use -h for help)" ;;
+ [^1]) die "only one operation may be used at a time" ;;
+esac
+
+[[ -d $cachedir ]] ||
+ die "cachedir \`%s' does not exist or is not a directory" "$cachedir"
+
+[[ $movedir && ! -d $movedir ]] &&
+ die "move-to directory \`%s' does not exist or is not a directory" "$movedir"
+
+if (( move || delete )); then
+ # make it an absolute path since we're about to chdir
+ [[ ${movedir:0:1} != '/' ]] && movedir=$PWD/$movedir
+ [[ ! -w $cachedir || ( $movedir && ! -w $movedir ) ]] && needsroot=1
+fi
+
+# unlikely that this will fail, but better make sure
+cd "$cachedir" || die "failed to chdir to \`%s'" "$cachedir"
+
+# note that these results are returned in an arbitrary order from awk, but
+# they'll be resorted (in summarize) iff we have a verbosity level set.
+IFS=$'\n' read -r -d '' -a candidates < \
+ <(printf '%s\n' *.pkg.tar?(.+([^.])) | sort -V |
+ pkgfilter "$keep" "$scanarch" \
+ "${#whitelist[*]}" "${whitelist[@]}" \
+ "${#blacklist[*]}" "${blacklist[@]}")
+
+if (( ! ${#candidates[*]} )); then
+ msg 'no candidate packages found for pruning'
+ exit 1
+fi
+
+# do this before we destroy anything
+totalsaved=$(@SIZECMD@ "${candidates[@]}" | awk '{ sum = $1 } END { print sum }')
+
+# crush. kill. destroy.
+(( verbose )) && cmdopts+=(-v)
+if (( delete )); then
+ runcmd rm "${cmdopts[@]}" "${candidates[@]}"
+elif (( move )); then
+ runcmd mv "${cmdopts[@]}" "${candidates[@]}" "$movedir"
+fi
+
+summarize "${candidates[@]}"