#!/bin/sh

cat>test.c<<'C'
#include <unistd.h>
#include <stdio.h>

int add(int x,int y);

int main(int argc,char** argv) {
    enum { buf_size=4096 }; char buf[buf_size];
    int rd=readlink("/proc/self/exe",buf,buf_size-1); buf[rd]=0;
    printf("readlink=%s\n",buf);
    return add(1,-1);
}

C

cat>add.c<<'C'
int add(int x,int y) { return x+y; }

C

echo '--build x32 executables--'
gcc -m32 -o libadd.so -shared add.c
gcc -m32 -o test test.c -L. -ladd -Xlinker '-rpath=$ORIGIN/../libs:$ORIGIN/libs'
mkdir -p libs
mv libadd.so libs

echo '--test localy--'
./test && echo success1 || echo fail1

echo '--prepare archives--'

mkdir -p bin
sudo mount -t tmpfs -osize=1M none bin
cp test bin
mkdir -p bin/libs
cp libs/libadd.so bin/libs
rm -f bin.squashfs
mksquashfs bin bin.squashfs -comp xz 2>&1 > /dev/null
sudo umount bin

echo '--mount fs--'

sudo mount -t tmpfs -osize=1M none bin
mkdir bin/app bin/rom bin/diff
sudo mount -t squashfs -o ro bin.squashfs bin/rom
sudo mount -t overlayfs -o lowerdir=bin/rom,upperdir=bin/diff none bin/app
#sudo mount -t aufs -o br=bin/rom:bin/diff none bin/app
cd bin/app
./test && echo success2 || (
    echo fail2
    strace ./test 2>&1 | grep open | head
)
echo '--using crutch--'
LD_LIBRARY_PATH=$PWD/libs ./test && echo success3 || echo fail3

cd ../..

cd bin/rom
./test && echo success4 || echo fail4
cd ../..
sudo umount bin/app
sudo umount bin/rom
sudo umount bin