* James Rosten <seinfeld90@gmail.com>
FS#5009 fixes - use tar on the pacman DB so as to handle cases where the
base directory cannot be 'mv'ed and other such edge cases.
This commit is contained in:
Aaron Griffin
parent
86c8300924
commit
64e2eba268
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@ -22,33 +22,38 @@
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myver='3.0.0'
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error() {
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echo -e "\033[1;31m:: ERROR:\033[1;0m\033[1;1m$@\033[1;0m" >&2
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}
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source /etc/rc.d/functions
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usage() {
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echo "pacman-optimize $myver"
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echo "usage: $0 [pacman_db_root]"
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echo
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echo
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echo "pacman-optimize is a little hack that should improve the performance"
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echo "of pacman when reading/writing to its filesystem-based database."
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echo
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echo "Because pacman uses many small files to keep track of packages,"
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echo "there is a tendency for these files to become fragmented over time."
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echo "This script attempts to relocate these small files into one"
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echo "contiguous location on your hard drive. The result is that the hard"
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echo "continuous location on your hard drive. The result is that the hard"
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echo "drive should be able to read them faster, since the hard drive head"
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echo "does not have to move around the disk as much."
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echo
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}
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die() {
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echo "pacman-optimize: $*" >&2
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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 /tmp/pacman.lck
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die $*
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die $@
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}
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dbroot="/var/lib/pacman"
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if [ "$1" != "" ]; then
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@ -56,7 +61,7 @@ if [ "$1" != "" ]; then
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usage
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exit 0
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fi
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dbroot=$1
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dbroot="$1"
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fi
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# make sure pacman isn't running
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@ -64,48 +69,57 @@ if [ -f /tmp/pacman.lck ]; then
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die "Pacman lockfile was found. Cannot run while pacman is running."
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fi
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if [ ! -d $dbroot ]; then
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if [ ! -d "$dbroot" ]; then
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die "$dbroot does not exist or is not a directory"
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fi
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#if [ "$EUID" != 0 ]; then
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if [ ! -w "$dbroot" ]; then
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die "You must have correct permissions to optimize the database"
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fi
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# don't let pacman run while we do this
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# do not let pacman run while we do this
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touch /tmp/pacman.lck
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# step 1: sum the old db
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echo "==> md5sum'ing the old database..."
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find $dbroot -type f | sort | xargs md5sum >/tmp/pacsums.old
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stat_busy "Md5sum'ing the old database"
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find $dbroot -type f | sort | xargs md5sum > /tmp/pacsums.old
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stat_done
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# step 1: copy the entire db directory to a new one
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echo "==> copying $dbroot..."
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cp -a $dbroot $dbroot.new || die_r "error copying $dbroot"
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# step 2: tar it up
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stat_busy "Tar'ing up $dbroot"
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cd $dbroot
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tar -czf /tmp/pacmanDB.tgz ./ || \
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stat_fail && die_r "tar'ing up $dbroot failed"
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stat_done
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# step 2: switch the directory names and sum the new one
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echo "==> md5sum'ing the new database..."
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mv $dbroot $dbroot.bak || die_r "error renaming $dbroot"
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mv $dbroot.new $dbroot || die_r "error renaming $dbroot.new"
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find $dbroot -type f | sort | xargs md5sum >/tmp/pacsums.new
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# step 3: make and sum the new db
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stat_busy "Making and md5sum'ing the new db"
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mkdir $dbroot.new
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tar -zxpf /tmp/pacmanDB.tgz -C $dbroot.new/ || \
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stat_fail && die_r "untar'ing $dbroot failed"
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find $dbroot.new -type -f | sort | xargs md5sum > /tmp/pacsums.new
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stat_done
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# step 3: compare sums
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echo "==> checking integrity..."
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# step 4: compare the sums
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stat_busy "Checking integrity"
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diff /tmp/pacsums.old /tmp/pacsums.new >/dev/null 2>&1
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if [ $? -ne 0 ]; then
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# failed, move the old one back into place
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rm -rf $dbroot
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mv $dbroot.bak $dbroot
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# failed
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stat_fail
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# leave /tmp/pacsums.old and .new for checking to see what doesn't match up
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rm -rf "$dbroot.new" /tmp/pacman.lck /tmp/pacmanDB.tgz
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die_r "integrity check FAILED, reverting to old database"
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fi
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# step 4: remove the backup
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echo "==> removing old database..."
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rm -rf $dbroot.bak || die_r "error removing backup $dbroot.bak"
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# step 5: remove the new temporary database and the old one
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# and use the .tgz to replace the old one
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stat_busy "Putting the new database in place"
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rm -rf "$dbroot.new" "$dbroot"/*
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tar -zxpf /tmp/pacmanDB.tgz -C "$dbroot"/
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stat_done
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# remove the lock and sum files
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rm -f /tmp/pacman.lck /tmp/pacsums.old /tmp/pacsums.new
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# remove the lock file, sum files, and .tgz of database
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rm -f /tmp/pacman.lck /tmp/pacmsums.old /tmp/pacmsums.new /tmp/pacmanDB.tgz
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echo
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echo "Finished. Your pacman database has been optimized."
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