bayhac2014

Small haskell webapp using Scotty and ImageMagick

If you're on a VM and need to update cabal first:

• Create a swap file (digitalocean and AWS VMs have no swap by default)

  See http://stackoverflow.com/questions/13104630/exitfailure-9-when-trying-to-install-ghc-mod-using-cabal

    dd if=/dev/zero of=/swapfile bs=256M count=4
    mkswap /swapfile
    swapon /swapfile
  

• Update package list

    cabal update
  

• Install zlib library needed by cabal-install (otherwise next step fails)

  (You may also need apt-get install zlibc, but I'm not sure. I'm pretty sure that installing zlibc without zlib1g-dev doesn't work, though)

    apt-get install zlib1g-dev
  

• Get the latest versions of cabal and cabal-install

  We need this for sandboxing (which we use below)

    cabal install cabal cabal-install
  

• Create sandbox

  (Necessary, because otherwise I get package conflicts every time)

    cabal sandbox init
  

If everything is all set up

• Install PostgreSQL (needed by one of the cabal dependencies)

    apt-get install postgresql-server-dev-9.3
  

  (It's possible that postgresql-server-dev-all also works, but -9.3 was the only package I tried)

• Install deps of the image app

    cabal install --only-dependencies
  

• Build the app

    cabal build