#!/bin/sh -eu

# This function exists to set up the DOCKER variable and verify that

# it's the binary we expect. It also verifies that the docker service

# is running on the system and we can talk to it.

function checkdocker() {

  if which docker.io >> /dev/null 2>&1 ; then

    DOCKER=docker.io

  elif which docker >> /dev/null 2>&1 ; then

    DOCKER=docker

  else

    echo "Error: docker must be installed"

    exit 1

  fi

  $DOCKER -h 2> /dev/null | grep -q Jansens && { echo "Error: $DOCKER is the Docking System Tray - install docker.io instead"; exit 1; }

  $DOCKER version | grep -q "^Client version:" || { echo "Error: unexpected output from \"$DOCKER version\""; exit 1; }

  $DOCKER version | grep -q "^Server version:" || { echo "Error: could not get docker server version - check it is running and your permissions"; exit 1; }

}

# Construct a container and leave its name in $CONTAINER for future use.

function initcontainer() {

  [ "$1" ] || { echo "Error: platform name must be specified"; exit 1; }

  DFILE="$ROOTDIR/contrib/docker/$1"

  [ -f "$DFILE" ] || { echo "Error: docker file $DFILE not found"; exit 1; }

  CONTAINER="hg-dockerrpm-$1"

  DBUILDUSER=build

  (

    cat $DFILE

    if [ $(uname) = "Darwin" ] ; then

        # The builder is using boot2docker on OS X, so we're going to

        # *guess* the uid of the user inside the VM that is actually

        # running docker. This is *very likely* to fail at some point.

        echo RUN useradd $DBUILDUSER -u 1000

    else

        echo RUN groupadd $DBUILDUSER -g `id -g`

        echo RUN useradd $DBUILDUSER -u `id -u` -g $DBUILDUSER

    fi

  ) | $DOCKER build --tag $CONTAINER -

}