163 lines
4.5 KiB
Bash
163 lines
4.5 KiB
Bash
#!/bin/bash
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#
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# pacman-optimize
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# @configure_input@
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#
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# Copyright (c) 2002-2007 by Judd Vinet <jvinet@zeroflux.org>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# gettext initialization
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export TEXTDOMAIN='pacman'
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export TEXTDOMAINDIR='@localedir@'
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myver='@PACKAGE_VERSION@'
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dbroot='@localstatedir@/lib/pacman/'
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lockfile="${dbroot}db.lck"
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msg() {
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local mesg=$1; shift
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printf "==> ${mesg}\n" "$@" >&2
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}
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error () {
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local mesg=$1; shift
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printf "==> ERROR: ${mesg}\n" "$@" >&2
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}
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usage() {
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printf "pacman-optimize (pacman) %s\n\n" "$myver"
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printf "$(gettext "Usage: %s [pacman_db_root]")\n\n" "$0"
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printf "$(gettext "\
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pacman-optimize is a little hack that should improve the performance\n\
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of pacman when reading/writing to its filesystem-based database.\n\n")"
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printf "$(gettext "\
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Because pacman uses many small files to keep track of packages,\n\
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there is a tendency for these files to become fragmented over time.\n\
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This script attempts to relocate these small files into one\n\
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continuous location on your hard drive. The result is that the hard\n\
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drive should be able to read them faster, since the hard drive head\n\
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does not have to move around the disk as much.\n")"
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}
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version() {
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printf "pacman-optimize (pacman) %s\n" "$myver"
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printf "$(gettext "\
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Copyright (C) 2002-2007 Judd Vinet <jvinet@zeroflux.org>.\n\n\
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This is free software; see the source for copying conditions.\n\
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There is NO WARRANTY, to the extent permitted by law.\n")"
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}
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die() {
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error "$@"
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exit 1
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}
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die_r() {
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rm -f "$lockfile"
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die "$@"
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}
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if [ "$1" = "-h" -o "$1" = "--help" ]; then
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usage
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exit 0
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fi
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if [ "$1" = "-V" -o "$1" = "--version" ]; then
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version
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exit 0
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fi
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if [ "$1" != "" ]; then
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dbroot="$1"
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fi
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# make sure diff is installed
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if ! type diff >/dev/null 2>&1; then
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die "$(gettext "diff tool was not found, please install diffutils.")"
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fi
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# make sure pacman isn't running
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if [ -f "$lockfile" ]; then
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die "$(gettext "Pacman lock file was found. Cannot run while pacman is running.")"
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fi
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if [ ! -d "$dbroot" ]; then
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die "$(gettext "%s does not exist or is not a directory.")" "$dbroot"
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fi
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if [ ! -w "$dbroot" ]; then
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die "$(gettext "You must have correct permissions to optimize the database.")"
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fi
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workdir=$(mktemp -d /tmp/pacman-optimize.XXXXXXXXXX) ||
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die_r "$(gettext "ERROR: Can not create temp directory for database building.")\n" >&2
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# do not let pacman run while we do this
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touch "$lockfile"
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# step 1: sum the old db
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msg "$(gettext "MD5sum'ing the old database...")"
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find "$dbroot" -type f | sort | xargs md5sum > "$workdir/pacsums.old"
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# step 2: tar it up
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msg "$(gettext "Tar'ing up %s...")" "$dbroot"
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cd "$dbroot"
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bsdtar -czf "$workdir/pacmanDB.tgz" ./
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if [ $? -ne 0 ]; then
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rm -rf "$workdir"
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die_r "$(gettext "Tar'ing up %s failed.")" "$dbroot"
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fi
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# step 3: make and sum the new db
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msg "$(gettext "Making and MD5sum'ing the new db...")"
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mkdir "$dbroot.new"
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bsdtar -zxpf "$workdir/pacmanDB.tgz" -C "$dbroot.new/"
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if [ $? -ne 0 ]; then
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rm -rf "$workdir"
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die_r "$(gettext "Untar'ing %s failed.")" "$dbroot"
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fi
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find "$dbroot.new" -type f | sort | \
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xargs md5sum | sed 's#.new/##' > "$workdir/pacsums.new"
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# step 4: compare the sums
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msg "$(gettext "Checking integrity...")"
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diff "$workdir/pacsums.old" "$workdir/pacsums.new" >/dev/null 2>&1
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if [ $? -ne 0 ]; then
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# failed
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# leave /tmp/pacsums.old and .new for checking to see what doesn't match up
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rm -rf "$dbroot.new"
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die_r "$(gettext "Integrity check FAILED, reverting to old database.")"
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fi
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# step 5: remove the new temporary database and the old one
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# and use the .tgz to replace the old one
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msg "$(gettext "Putting the new database in place...")"
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rm -rf "$dbroot.new" "$dbroot"/*
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bsdtar -zxpf "$workdir/pacmanDB.tgz" -C "$dbroot/"
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# remove the lock file, sum files, and .tgz of database
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rm -f "$lockfile"
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rm -rf "$workdir"
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echo
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msg "$(gettext "Finished. Your pacman database has been optimized.")"
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msg "$(gettext "For full benefits of pacman-optimize, run 'sync' now.")"
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echo
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exit 0
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# vim: set ts=2 sw=2 noet:
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