#! /bin/sh
# addmissing - add missing articles to history
# Has a SORTTMP hook for feeding in a "-T dir" option if sort's default
# temporary directory is short of space.
# =()<. ${NEWSCONFIG-@<NEWSCONFIG>@}>()=
. ${NEWSCONFIG-/var/lib/news/bin/config}

PATH=$NEWSCTL/bin:$NEWSBIN/expire:$NEWSBIN:$NEWSPATH ; export PATH
umask $NEWSUMASK

dbzrebuild=n
case "$1" in
-d)	dbzrebuild=y	;;
esac

# get main lock for history examination, and lock out expire too
lock="$NEWSCTL/LOCK"
ltemp="$NEWSCTL/L.$$"
echo $$ >$ltemp
trap "rm -f $ltemp ; exit 0" 0 1 2 15
while true
do
	if newslock $ltemp $lock
	then
		trap "rm -f $ltemp $lock ; exit 0" 0 1 2 15
		break
	fi
	sleep 30
done
if newslock $ltemp $NEWSCTL/LOCKexpire
then
	trap "rm -f $ltemp $lock $NEWSCTL/LOCKexpire ; exit 0" 0 1 2 15
else
	echo "$0: expire is running, $0 aborted" >&2
	exit 1
fi

# check space
cd $NEWSCTL
size="`sizeof history history.pag history.dir`"
if test " `spacefor $size control`" -le 0
then
	echo "$0: not enough space for temporaries, $0 aborted" >&2
	exit 1
fi

# put together a list of known filenames from history
egrep '	.*	' history | sed 's/.*	//' | tr '. ' '/
' | egrep '/' | sort -u $SORTTMP >/tmp/hist$$

# release the main lock, temporarily
trap "rm -f $ltemp $NEWSCTL/LOCKexpire ; exit 0" 0 1 2 15
rm $lock

# sweep the tree, ignoring things that arrive while we're working
cd $NEWSARTS
them=
for f in `ls | egrep -v '\.|(^lost\+found$)'`
do
	if test -d $f -a -r $f
	then
		them="$them $f"
	fi
done
find $them -type f -name '[0-9]*' ! -newer $ltemp -print |
	sort $SORTTMP >/tmp/tree$$

# find missing files, and build history entries for them
comm -13 /tmp/hist$$ /tmp/tree$$ | histinfo | sort $SORTTMP |
	awk -f $NEWSBIN/expire/histdups | histslash >/tmp/new$$

# check for oddities
if egrep '^<[^>]*@trash>	' /tmp/new$$ >/dev/null
then
	echo "$0: (warning) empty/trash articles found, will expire at once" >&2
	echo "$0:     (grep history file for '@trash' to see them)" >&2
fi

# lock things up again and plug them in
cd $NEWSCTL
while true
do
	if newslock $ltemp $lock
	then
		trap "rm -f $ltemp $lock $NEWSCTL/LOCKexpire ; exit 0" 0 1 2 15
		break
	fi
	sleep 30
done
if test " $dbzrebuild" = " y"
then
	cat /tmp/new$$ >>history
	dbz history
else
	dbz -a history /tmp/new$$
fi

rm -f /tmp/hist$$ /tmp/tree$$ /tmp/new$$