Statically compile pdftk for Heroku. Need to split PDF into single page files

Question

So we\'re using heroku to host our rails application. We\'ve moved to the cedar stack. This stack does not have the pdftk library installed. I contacted support and was told to

Answer 1

The easy solution is to add the one dependency for pdftk that is not found on heroku.

$ldd pdftk
    linux-vdso.so.1 =>  (0x00007ffff43ca000)
    libgcj.so.10 => not found
    libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x00007f1d26d48000)
    libm.so.6 => /lib/libm.so.6 (0x00007f1d26ac4000)
    libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x00007f1d268ad000)
    libc.so.6 => /lib/libc.so.6 (0x00007f1d2652a000)
    libpthread.so.0 => /lib/libpthread.so.0 (0x00007f1d2630c000)
    /lib64/ld-linux-x86-64.so.2 (0x00007f1d27064000)

I put pdftk and libgcj.so.10 into the /bin directory of my app. You then just need to tell heroku to look at the /bin dir when loading libs.

You can type

$heroku config
LD_LIBRARY_PATH:             /app/.heroku/vendor/lib
LIBRARY_PATH:                /app/.heroku/vendor/lib

To see what your current LD_LIBRARY_PATH is set to and then add /app/bin (or whatever dir you chose to store libgcj.so.10) to it.

$heroku config:set LD_LIBRARY_PATH=/app/.heroku/vendor/lib:/app/bin

The down side is that my slug size went from 15.9MB to 27.5MB