#!/bin/bash
# This script runs 'buildtest' on each of several distros
# via Docker.

# shellcheck disable=SC2016

set -o pipefail

exec 3>&1 4>&2
die() { echo "$*" >&4; exit 1; }

[ -e "ShellCheck.cabal" ] || die "ShellCheck.cabal not in this dir"

[ "$1" = "--run" ] || {
cat << EOF
This script pulls multiple distros via Docker and compiles
ShellCheck and dependencies for each one. It takes hours,
and is still highly experimental.

Make sure you're plugged in and have screen/tmux in place,
then re-run with $0 --run to continue.

Also note that dist* will be deleted.
EOF
exit 0
}

echo "Deleting 'dist' and 'dist-newstyle'..."
rm -rf dist dist-newstyle

log=$(mktemp) || die "Can't create temp file"
date >> "$log" || die "Can't write to log"

echo "Logging to $log" >&3
exec >> "$log" 2>&1

final=0

echo "Trying to build pre-commit docker image"
if ! docker build --tag precommit .
then
  final=1
  echo "pre-commit image failed to build"
else
  if printf '%s\n' '#!/bin/sh' 'echo $1' | docker run -i precommit -
  then
    final=1
    echo "pre-commit image succeeds with incorrect example"
  fi

  if ! printf '%s\n' '#!/bin/sh' 'echo "$1"' | docker run -i precommit -
  then
    final=1
    echo "pre-commit image fails with correct example"
  fi
fi

if [[ $final -ne 0 ]]
then
  echo >&3 "pre-commit image failure, see log"
else
  echo >&3 "pre-commit image succeeded"
fi

while read -r distro setup
do
  [[ "$distro" = "#"* || -z "$distro" ]] && continue
  printf '%s ' "$distro" >&3
  docker pull "$distro" || die "Can't pull $distro"
  printf 'pulled. ' >&3

  tmp=$(mktemp -d) || die "Can't make temp dir"
  cp -r . "$tmp/" || die "Can't populate test dir"
  printf 'Result: ' >&3
  < /dev/null docker run -v "$tmp:/mnt" "$distro" sh -c "
    $setup
    cd /mnt || exit 1
    test/buildtest
    "
  ret=$?
  if [ "$ret" = 0 ]
  then
    echo "OK" >&3
  else
    echo "FAIL with $ret. See $log" >&3
    final=1
  fi
  rm -rf "$tmp"
done << EOF
# Docker tag          Setup command
debian:stable         apt-get update && apt-get install -y cabal-install
debian:testing        apt-get update && apt-get install -y cabal-install
ubuntu:latest         apt-get update && apt-get install -y cabal-install
haskell:latest        true
opensuse/leap:latest  zypper install -y cabal-install ghc
fedora:latest         dnf install -y cabal-install ghc-template-haskell-devel findutils
archlinux/base:latest pacman -S -y --noconfirm cabal-install ghc-static base-devel

# Other versions we want to support
ubuntu:18.04          apt-get update && apt-get install -y cabal-install

# Misc Haskell including current and latest Stack build
ubuntu:18.04          set -e; apt-get update && apt-get install -y curl && curl -sSL https://get.haskellstack.org/ | sh -s - -f && cd /mnt && exec test/stacktest
EOF

exit "$final"