# Basedir where include files for current kernel are installed
KERNELDIR=/usr/src/linux
#/lib/modules/$(shell uname -r)/build
# Basedir where include files for the UserMode linux reside
KERNELDIR_UM=/usr/src/linux-2.4.18-um27

-include $(KERNELDIR)/.config
# compiler options common to all platforms
CFLAGS=-O2 -Wall -Werror -fno-strict-aliasing
ifdef CONFIG_ALPHA
CFLAGS+=-Wstrict-prototypes -Wno-trigraphs \
       -fno-common -fomit-frame-pointer -pipe \
       -mno-fp-regs -ffixed-8 -mcpu=pca56 -Wa,-mev6 
endif
ifdef CONFIG_X86
CFLAGS+=-Wstrict-prototypes -fomit-frame-pointer -pipe -fno-strength-reduce
endif

F=/tmp/fromdir
T=/tmp/todir
M=translucency
D=$M-0.6.0
O=extension.o staticext.o base.o
E=extension

KERNELVERSION = $(shell awk -F\" '/UTS_RELEASE/{print $$2}' ${KERNELDIR}/include/linux/version.h )
KERNELINCLUDE = $(shell if [ "${ARCH}" = "um" ] ; \
	then echo -I$(KERNELDIR_UM)/include -I$(KERNELDIR_UM)/arch/um/include -I$(KERNELDIR_UM)/arch/um/kernel/skas/include -I$(KERNELDIR_UM)/arch/um/kernel/tt/include; \
	else echo -I$(KERNELDIR)/include ; fi)

CFLAGS += -D__KERNEL__ -DMODULE
ifndef ARCH
#include $(KERNELDIR)/.config
ifdef CONFIG_SMP
CFLAGS += -D__SMP__ -DSMP
endif
endif

CFLAGS += $(KERNELINCLUDE) $(INCLUDE)

all: $M.o
$M.o: $O
	ld -i $O -o $M.o

$E.c: redirect.txt makeext.pl
	perl makeext.pl $E redirect.txt
	if [ -e extension.diff ] ; then patch -p0 $E.c < extension.diff ; fi

ok:
	cp -a $E.c extension.c
	mv $E.h extension.h

extdiff:
	cp -a extension.c $En.c
	perl makeext.pl $E redirect.txt
	-diff -u $E.c $En.c > extension.diff
	mv $En.c $E.c

%.o: %.c base.h compatibility.h extension.h
	gcc -c $(CFLAGS) $<
%.s: %.c Makefile
	gcc -S -g $(CFLAGS) $<
install: all
	gzip -c9 $M.8 > $M.8.gz
	install -d $(DESTDIR){/usr/share/man/man8/,/lib/modules/${KERNELVERSION}/kernel/fs/,/sbin/}
	install -p -m 644 $M.8.gz $(DESTDIR)/usr/share/man/man8/
	rm translucency.8.gz
	install -p -m 644 $M.o $(DESTDIR)/lib/modules/${KERNELVERSION}/kernel/fs/
	install -p -m 755 mount.translucency $(DESTDIR)/sbin/
uninstall:
	rm -f $(DESTDIR){/usr/share/man/man8/$M.8.gz,/lib/modules/${KERNELVERSION}/kernel/fs/$M.o,/sbin/mount.translucency}
tar: tgz
tgz: distclean extension.c
	chmod a+rX . -R
	chmod go-w . -R
	tar czf ../$D.tar.gz -C .. --owner=0 --group=0 $D/

ramdsk: $T/is_ramdsk

$T/is_ramdsk:
	dd if=/dev/zero of=/dev/ram1 count=4096
	mke2fs /dev/ram1
	mkdir -p $T
	mount /dev/ram1 $T
	touch $T/is_ramdsk

testfiles: $T/have_testfiles

$T/have_testfiles:
	mkdir -p $F/sub
	mkdir -p $F/sub2
	echo 'this is file "static"' >$F/static
	echo 'this is file "sub/static"' >$F/sub/static
	echo 'this is file "sub2/static"' >$F/sub2/static
	echo 'this is static file "sub/test"' >$F/sub/test
	echo 'this is static file "sub2/test"' >$F/sub2/test
	mkdir -p $T/sub2
	mkdir -p $T/sub3
	mknod $F/sub2/null c 1 3
	mknod $F/sub2/fifo p
	echo 'this is file "test"' > $T/test
	echo 'this is overlayed file "sub2/test"' > $T/sub2/test
	echo 'this is file "sub2/dynamic"' > $T/sub2/dynamic
	echo 'this is file "sub3/test"' > $T/sub3/test
	echo 'this is file "/tmp/linktest"' > /tmp/linktest
	echo -e \#\!/bin/sh\\necho static > $F/sub2/exectest
	chmod 755 $F/sub2/exectest
	-ln -s "static" $F/link
	-ln -s "../linktest" $F/link2
	-ln -s "../linktest" $T/link2
	-ln -s "$T/sub3/test" $F/link3
	-ln -s "$F/sub/static" $T/link4
	-ln -s "$F/sub" $T/link5
	-ln -s "$F/sub2" $T/link6
	-ln -s "$F/sub3" $F/link7
	-ln -s "$T/sub3" $F/link8
	-chmod -R a-w /tmp/fromdir/ 
	touch $T/have_testfiles

test: $M.o testfiles
	sync
	insmod $M.o 
	echo "$F -> $T" > /proc/sys/translucency/0
	-find $T $F | sort
	-find $F/link5/ $F/link8/ | sort	#$F/link6
	-sleep 1
	-cat $F/test
	-cat $F/static
	-cat $F/sub/test
	-cat $F/sub2/test
	-cat $F/sub3/test
	-cat $F/sub2/static
	-cat $F/link
	-cat $F/link2
	-cat $F/link3
	-cat $F/link4
	-cat $F/link5/test
	-cat $F/link6/test
	-cat $F/link7/test
	-cat $F/link8/test
	-cat $F/sub/../sub3/test
	-cat $F/sub3/../sub/test
	-echo devices are bad... > $F/sub2/null
	-cat $F/sub2/null
	-test `ls $F/sub2/test*|wc -l` -ge 2 && echo we have multiple dir-entries
	-$F/sub2/exectest
	-echo echo appended >>$F/sub2/exectest
	-$F/sub2/exectest
	-rm $F/sub2/exectest
	-echo -e \#\!/bin/sh\\necho overridden > $F/sub2/exectest
	-$F/sub2/exectest
	-rm $F/sub2/exectest
	-$F/sub2/exectest
	-echo 2 > /proc/sys/translucency/flags
	-echo echo appended >>$F/sub2/exectest
	-$F/sub2/exectest
	-echo 4 > /proc/sys/translucency/flags
	-find $F | sort
	-echo 1 > /proc/sys/translucency/flags
	-find $F $T | sort
	-cat $F/sub2/test
	-$F/sub2/exectest
	-echo 0 > /proc/sys/translucency/flags
	-$F/sub2/exectest
	-rm $F/sub2/exectest
	-echo "" > /proc/sys/translucency/0
	rmmod $M

ktest: $M.o
	#-rm -rf $T
	mkdir -p $T/include
	cp -a $(KERNELDIR)/include/asm-i386 $T/include/
	-rm -f $(KERNELDIR)/include/asm		#have a clean kernel
	chown -R nobody. $T
	sync
	insmod $M.o 
	echo 65534 > /proc/sys/translucency/uid
	echo "$(KERNELDIR)/ -> $T" > /proc/sys/translucency/0
	-su nobody -c "cd $(KERNELDIR); make menuconfig"
	echo 4 >/proc/sys/translucency/flags	#turn off merged dir listings
	-su nobody -c "cd $(KERNELDIR); make dep"
	echo 0 >/proc/sys/translucency/flags
	rm $T/include/asm; ln -s asm-i386 $T/include/asm
	-su nobody -c "cd $(KERNELDIR); make bzImage modules"
	echo "" > /proc/sys/translucency/0
	rmmod $M

cleantestfiles:
	-rm -rf $F $T /tmp/linktest
testprep:
	make cleantestfiles testfiles all > /dev/null
testrun: testprep
	make test 2>&1 | grep -v "ing directory" | diff -u testrun.txt -
refrun: testprep
	make test 2>&1 | grep -v "ing directory" > testrun.txt

clean:
	-rm -f *.o *.rej *.[ch].orig 
distclean: mrproper
mrproper: clean
	-rm -rf /tmp/fromdir /tmp/todir /tmp/linktest *.s *~ .\#* $E.[ch]