#!/bin/sh

# Copyright (C) 2019 Richard Mortier <mort@cantab.net>
# Licensed under the MIT License, https://opensource.org/licenses/MIT

set -e

die () {
  printf "%s\n" "$*" >&2
  exit 1
}

## debug
if [ "$DABUILD_DEBUG" = "true" ]; then
  set -x
  PS4='$LINENO: '
fi

## check running from within an `aports` tree
if [ "${PWD%*/aports*}" = "$PWD" ]; then
  die "Error: expecting to be run from within an aports tree!" \
      "Could not find '/aports' in the current path ($PWD)"
  exit 1
fi

## allow setting of arch by env variable
[ ! "$DABUILD_ARCH" ] && DABUILD_ARCH=$(uname -m)
case "$DABUILD_ARCH" in
  x86|x86_64|aarch64|armhf|armv7) ;;
  *) die "Unsupported arch \"$DABUILD_ARCH\" detected." ;;
esac

## use branch to figure out most appropriate alpine version
if [ "$DABUILD_VERSION" ]; then
  ABUILD_VERSION=$DABUILD_VERSION
else
  APORTS_BRANCH=$(git status | head -1)
  APORTS_BRANCH="${APORTS_BRANCH##*[ /]}"
  case $APORTS_BRANCH in
    [[:digit:]].[[:digit:]]-stable )
      ABUILD_VERSION=${APORTS_BRANCH%-stable}
      ;;

    * )
      ABUILD_VERSION=edge
      ;;
  esac
fi

## check $DABUILD_PACKAGES is a writable directory
ABUILD_PACKAGES=${DABUILD_PACKAGES:-${PWD%/aports*}/packages/${ABUILD_VERSION}}

mkdir -p $ABUILD_PACKAGES
if [ ! \( -d "$ABUILD_PACKAGES" -a -w "$ABUILD_PACKAGES" \) ]; then
  die "Error: invalid or unwritable packages directory specified!" \
      "ABUILD_PACKAGES = '$ABUILD_PACKAGES'" \
      "DABUILD_PACKAGES = '$DABUILD_PACKAGES'"
fi

## setup volumes; use named volumes as cache if desired
ABUILD_VOLUMES="-v ${HOME}/.abuild:/home/builder/.abuild \
  -v ${PWD%/aports*}/aports:/home/builder/aports \
  -v ${ABUILD_PACKAGES}:/home/builder/packages"

if [ -f "/etc/abuild.conf" ]; then
  ABUILD_VOLUMES="$ABUILD_VOLUMES -v /etc/abuild.conf:/etc/abuild.conf:ro"
fi

if [ -w "/var/cache/distfiles" ]; then
  ABUILD_VOLUMES="$ABUILD_VOLUMES -v /var/cache/distfiles:/var/cache/distfiles"
fi

if [ "$DABUILD_CACHE" = "true" ]; then
  for v in %%ABUILD_VOLUMES%% ; do
    vol=abuild-$ABUILD_VERSION-$DABUILD_ARCH-${v//\//_}
    if [ "$DABUILD_CLEAN" = "true" ]; then
      ## clean the cache if requested
      docker rm -f $(docker ps -qaf "volume=$vol") >/dev/null 2>&1 || true
      docker volume rm $vol >/dev/null
    fi

    if docker volume ls -f 'name=$v' | grep $v >/dev/null ; then
      docker volume create $vol >/dev/null
    fi
    ABUILD_VOLUMES="$ABUILD_VOLUMES -v $vol:/$v"
  done
fi

## go!
ABUILD_WORKDIR=/home/builder/aports${PWD#*/aports}
DOCKER="docker run -ti $ABUILD_VOLUMES -e DABUILD_DEBUG $DABUILD_ARGS"
$DOCKER --workdir $ABUILD_WORKDIR \
	%%ABUILD_IMAGE%%:$ABUILD_VERSION-$DABUILD_ARCH "$@"