#!/bin/sh
# Script to test the attribute cache behavior of the local OS client.
# If this script fails, it means that Amd cannot turn off the attrcache
# reliably on this host, and Amd therefore may not run reliably.  See
# the README.attrcache file distributed with this am-utils.
#	-Erez Zadok, September 29, 2005

# set PATH (must install am-utils first)
prefix=@prefix@
exec_prefix=@exec_prefix@
PATH=@sbindir@:@bindir@:/usr/ucb:/usr/bin:/bin:${PATH}
export PATH

# test if amd is running
amq -p > /dev/null 2>&1
if test $? = 0
then
	echo "### Amd already running... please shutdown Amd first"
	exit 1
fi

mapfile="/tmp/amd.testmap.$$"
logfile="/var/log/amd"
delay=1
a=/a

CreateMap1 () {
	echo "### Creating correct map"
	cat - >$mapfile <<EOF
a	type:=link;fs:=/tmp/a
EOF
}

CreateMap2 () {
	echo "### Creating weird map"
	cat - >$mapfile <<EOF
a	type:=link;fs:=/tmp/b
EOF
}

StopAMD () {
	ctl-amd stop
# do not delete files we may need to use to debug Amd
#	rm -f /tmp/a /tmp/b $mapfile $logfile
}

touch /tmp/a
touch /tmp/b

CreateMap1
echo amd -x all -D all -r -l $logfile $a $mapfile -cache:=mapdefault,sync
amd -x all -D all -r -l $logfile $a $mapfile -cache:=mapdefault,sync
sleep 3				# give amd chance to start properly
amq
inode_a=`ls -lLi /tmp/a | awk '{print $1}'`
inode_b=`ls -lLi /tmp/b | awk '{print $1}'`
ls -lLi $a/a
ls -lLi $a/b
ls -l $mapfile

# how many times to try until we call it a success...
maxtry=10
while test $maxtry -gt 0
do
	echo "$maxtry tries left ..."
	let maxtry=maxtry-1
	amq
	CreateMap1
	sleep $delay

	ls -l $mapfile
	echo "### looking at a... should get a"
	ino=`ls -lLi $a/a | awk '{print $1}'`
	if test -z "$ino"
	then
		ls -li $a/a
		amq
		amq -m
		stat $a
		echo "a link does not exist!"
		StopAMD
		exit 1
	fi
	if test $ino -ne $inode_a
	then
		ls -li $a/a
		amq
		amq -m
		stat $a
		echo "a link does not point to A!"
		StopAMD
		exit 1
	fi

# Here is the main trick we try: force amd to flush one entry, then
# change the amd map on disk, and then see if the kernel will have
# flushed the attribute cache; if it did, then Amd will see the
# correctly changed map entry.

	amq -u $a/a
	sleep $delay
	stat $a

	CreateMap2
	sleep $delay

	ls -l $mapfile
	echo "### looking at a... should get b"
	ino=`ls -lLi $a/a | awk '{print $1}'`
	if test -z "$ino"
	then
		ls -li $a/a
		amq
		amq -m
		stat $a
		echo "a link does not exist!"
		StopAMD
		exit 1
	fi
	if test $ino -ne $inode_b
	then
		ls -li $a/a
		amq
		amq -m
		stat $a
		echo "a link does not point to B!"
		StopAMD
		exit 1
	fi

	amq -u $a/a
	sleep $delay
	stat $a
done
StopAMD