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#!/bin/sh

# Load debconf variables
. /usr/share/debconf/confmodule

conffile=/etc/popularity-contest.conf

set -e

if [ -e $conffile ] ; then
    # Fetch current values.
    . $conffile
fi

# Get this setting from debconf.  It was set based on the content of
# /etc/popularity-contest.conf in the 'config' script, so it should be
# safe to ignore the value fetched by loading the file above.  This
# should allow for using debconf to reconfigure the package.
db_get popularity-contest/participate || true
if [ "$RET" = "yes" ] || [ "$RET" = "YES" ] || [ "$RET" = "true" ]; then
    PARTICIPATE="yes"
else
    PARTICIPATE="no"
fi

# The md5 sum of an empty file
EMPTYID="d41d8cd98f00b204e9800998ecf8427e"

generate_id() {
        if which uuidgen >/dev/null 2>&1; then
                MY_HOSTID=`uuidgen -r | tr -d -`
        elif test -r /proc/sys/kernel/random/uuid; then
                MY_HOSTID=`tr -d - < /proc/sys/kernel/random/uuid`
        else
                MY_HOSTID=`od -x -An -N16 /dev/urandom | tr -d ' '`
        fi;
}

# Select a random day to submit on, to spread the load over time, unless it is already set.
select_random_day() {
        DAY=`bash -c 'echo $(($RANDOM % 7))'`
}

generate_crond() {
  MIN=`bash -c 'echo $(($RANDOM % 60))'`
  HOUR=`bash -c 'echo $(($RANDOM % 24))'`
  FILE=/etc/cron.daily/popularity-contest
  cat > /etc/cron.d/popularity-contest <<EOF
SHELL=/bin/sh
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
$MIN $HOUR * * *   root    test -x $FILE && $FILE --crond
EOF
}
generate_conffile() {
	generate_id
	generate_crond
	select_random_day
	cat <<-EOF >$conffile
		# Config file for Debian's popularity-contest package.
		#
		# To change this file, use:
		#        dpkg-reconfigure popularity-contest
		#
		# You can also edit it by hand, if you so choose.
		#
		# See /usr/share/popularity-contest/default.conf for more info
		# on the options.
		
		MY_HOSTID="$MY_HOSTID"
		PARTICIPATE="$PARTICIPATE"
		USEHTTP="yes"
		DAY="$DAY"
	EOF

	# preseeding is only allowed on first time install
	db_get popularity-contest/submiturls || true
	if [ -n "$RET" ] ; then
	    echo "SUBMITURLS=\"$RET\"" >> $conffile
	fi

	# Make sure user nobody can read the file.
	chmod a+r $conffile
}

case "$1" in
    configure)
	if [ ! -e $conffile ]; then
	    generate_conffile
	else
	    # If MY_HOSTID is not set, add it.  This is useful when disk images are prepared
	    if [ -z "$MY_HOSTID" ] ; then
	        generate_id
	        echo "MY_HOSTID=\"$MY_HOSTID\"" >> $conffile
	    fi

            OLDHOSTID="$MY_HOSTID";
            case "$MY_HOSTID" in
            # Workaround for bug #237874 triggered on hurd.  The
            # problem was fixed in version 1.15, 2004-03-20.

              $EMPTYID) generate_id;;
            # Workaround for bug #240603 triggered by md5sums change
            # of behaviour with stdin. version 1.17, 2004-04-12.
              *-)  MY_HOSTID="${MY_HOSTID%  -}";;
            esac;

	    # If DAY is not set, add it.
	    if [ -z "$DAY" ] ; then
	        select_random_day
	        echo "DAY=\"$DAY\"" >> $conffile
	    fi
	    if [ ! -f /etc/cron.d/popularity-contest ] ; then
	        generate_crond
	    fi

	    # Replace only if the content changed, to avoid changing the
	    # config file date when no change was done.

	    # Commenting out the obsolete addresses, to use the
	    # default config from /usr/share/ on hosts where
	    # the old default was unchanged.  Replace the "empty" id.

	    sedopts=" \
		s/^PARTICIPATE=.*$/PARTICIPATE=\"$PARTICIPATE\"/;   \
		s/^\(MAILTO=\"[email protected]\"\)$/#\1/;    \
		s/^\(MAILTO=\"[email protected]\"\)$/#\1/; \
		s/^\(MAILTO=\"[email protected]\"\)$/#\1/;   \
                "
            if [ "$OLDHOSTID" != "$MY_HOSTID" ]; then
                sedopts="$sedopts \
                s/^MY_HOSTID=\"\\?$OLDHOSTID\"\\?/MY_HOSTID=\"$MY_HOSTID\"/; \
		"
            fi

	    if sed "$sedopts" < $conffile > $conffile.new &&
		! cmp $conffile $conffile.new > /dev/null; then
		mv $conffile.new $conffile
		# Make sure user nobody can read the file.
		chmod a+r $conffile
	    else
		rm $conffile.new
	    fi
	fi
	;;
    *)
	;;
esac