pac-sync

#! /bin/bash
#
# bash script to check how up to date the pacman mirrors are
#
# This script reads the /etc/pacman.d/mirrorlist file to obtain a
# list of mirrors; then queries only those mirrors from countries
# of your choosing for their last update. If you want to ignore a
# given mirror, then give it the old "double comment" in the
# mirrorlist file, i.e.:
#
##Server = ftp://mirrors.kernel.org/archlinux/$repo/os/$arch
#Server = http://mirrors.kernel.org/archlinux/$repo/os/$arch
#
# in this case the ftp mirror would be ignored, while the http
# mirror would be queried.
#
# It uses wget to read the "lastsync" file from each server then
# writes this information to a file named /etc/pacman.d/mirrors.
#
# One of the these mirrors is then choosen as the preferred mirror
# using a simple heurstic. The wget's are run in parallel and the
# order in which they respond is noted.  The most recently updated
# mirror of the first 8 to respond (excluding those mirrors that
# have not been updated since the last time you ran 'pacman -Sy')
# will become the choosen mirror.
#
# This info will be written to the /etc/pacman.d/mirrors file.
# My /etc/pacman.conf is set up to Include this file for core,
# extra, and community.
#
# The choice of this mirror as the preferred one may not be the best
# choice, but it is both responsive and has been recently updated.
#
############## Edit this block to suit your taste ##############
#
# each country has to match listing in mirrorlist file (you may have
# any number of countries, but DON'T separate the list with commas!)
#
countries=("Any" "United States" "Canada")
#
# suitable defaults
#
pd=/etc/pacman.d/
infile=mirrorlist
outfile=mirrors
config=/etc/pacman.conf
log=/var/log/pacman.log
#
################################################################
#
get_sync_data() {
	sync_url=$(sed -e "s/\\\$repo.*/lastsync/" <<< $1)
	sync_time=$(wget -q -O - --tries=1 --timeout=10 $sync_url)
	if [[ "$?" == "0" ]]
	then
		[[ $sync_time =~ .*[^0-9] ]] && sync_time=$(date --date="$sync_time" +%s)
		let "delta = $2 - sync_time"
		let "d = delta / 86400"
		let "h = delta % 86400 / 3600"
		let "m = delta % 86400 % 3600 / 60"
		printf "#%3dd %2dh %2dm  %s %d\n" $d $h $m $1 $delta
	fi
}
#
# Acquire last sync data from mirrors
#
current_time=$(date +%s)
echo -n "Querying mirrors ..."
sync_data=$(
	for country in "${countries[@]}"
	do
		for url in $(sed -n -r "/# $country/,/^$/ s/^#?Server = // p" < $pd$infile)
		do (get_sync_data $url $current_time) & done
	done
)
echo
script_name=$(sed "s!.*/\\(.*\\)!\\1!" <<< "$0")
if [[ -z $sync_data ]]
then
	echo "The network appears to be down as no mirrors could be contacted"
	echo "Retaining original $pd$outfile file."
	echo
	echo "$script_name aborted."
	echo
	exit
fi
#
# Start building new 'mirrors' file ($pd$outfile)
#
[[ -e $pd$outfile ]] && mv $pd$outfile $pd$outfile~
printf "# File auto-generated by '$script_name', do not edit.\n# $(date +%c)\n#\n" > $pd$outfile
sed -r "s@((f|ht)tp://[^/]+).*\$@\\1/@" <<< "$sync_data" >> $pd$outfile
echo "#" >> $pd$outfile
#
# Read pacman log file to determine date/time of last 'pacman -Sy'
#
b=[[:blank:]]
logfile=$(sed -n "s/^LogFile$b*=$b*\\(.*\\)/\\1/p" $config)
[[ -z $logfile ]] && logfile=$log
diff_t=999999999
dstr=$(grep "pacman *-S[^ ]*y" $logfile | tail -1 | sed -n "s/^\[\\(.*\\)\].*\$/\\1/ p")
if [[ ! -z $dstr ]]
then
	last_sync_time=$(date --date="$dstr" +%s)
	[[ "$?" -eq "0" ]] && let "diff_t = current_time - last_sync_time"
fi
#
# Append preferred mirror to 'mirrors' file. Disgard any mirror that
# has not been updated since last 'pacman -Sy'
#
awk "BEGIN{cnt=0}\$NF<$diff_t{if(cnt<8){cnt++; print;}}" <<< "$sync_data" |
	sort -s --key=2n --key=3n --key=4n |
	awk 'NR == 1 {print "Server =", $5}' >> $pd$outfile
#
# Check if any mirror has been updated recently enough
#
mirror_count=$(tail -1 $pd$outfile | sed -n '/^Server = / p' | wc --lines)
if [[ "$mirror_count" -eq "0" ]]
then
	[[ -e $pd$outfile~ ]] && mv $pd$outfile~ $pd$outfile
	cat $pd$outfile
	echo
	echo "No server has been updated since you last ran 'pacman -Sy'"
	echo "Retaining original $pd$outfile file."
	echo
	echo "$script_name aborted."
	echo
	exit
fi
#
# Use preferred mirror and update
#
[[ -e $pd$outfile~ ]] && rm $pd$outfile~
echo
cat $pd$outfile
echo
echo "using log file: $logfile"
tail $logfile
echo
echo "pacman -Syy"
pacman -Syy
echo
#
# declare two associative arrays
#
declare -A local_version
declare -A sync_version

#
# obtain list of packages needing upgrade along with current version number
#
pkg_count=0
while read name version
do
	[[ -z $version ]] && break
	local_version[$name]=$version
	let "pkg_count += 1"
done <<< "$(pacman -Qu)"

echo -n "$pkg_count updated packages available."
if [[ $pkg_count -gt "0" ]]
then
#
# obtain new version numbers
#
	echo " Run 'pacman -Su'."
	db_dir=$(pacman -v | sed -n 's/.*DB Path *: *\([^ ]*\).*/\1/p')
	for name in "${!local_version[@]}"
	do
		# x=(../foo*)  expands x into an array containing the names
		# of each file currently matching '../foo*'
		sync_files=(${db_dir}sync/*/$name*/desc)
		for file in "${sync_files[@]}"
		do
			sname=''
			version=''
			lastline=''
			while read line
			do
				[[ "$lastline" =~ %NAME% ]] && sname=$line
				[[ "$lastline" =~ %VERSION% ]] && version=$line
				if [[ ! -z $sname && ! -z $version ]]
				then
					sync_version[$sname]=$version
					version=''
					sname=''
				fi
				lastline=$line
			done < $file
		done
	done

	# output update information
	black='\e[0m'
	red='\e[0;31m'
	blue='\e[0;34m'
	green='\e[0;32m'
	for name in "${!local_version[@]}"
	do
		echo
		echo -ne "	$name: $blue${local_version[$name]}"
		echo -ne " $black=> $red${sync_version[$name]}$black"
	done
fi
echo
echo
exit 0