#!/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.
proc checkdocker {
  if which docker.io >> /dev/null !2 > !1  {
    setglobal DOCKER = 'docker.io'
  } elif which docker >> /dev/null !2 > !1  {
    setglobal DOCKER = 'docker'
  } else {
    echo "Error: docker must be installed"
    exit 1
  }

  $DOCKER -h !2 > /dev/null | grep -q Jansens && do { echo "Error: $DOCKER is the Docking System Tray - install docker.io instead"; exit 1; }
  $DOCKER version | grep -q "^Client version:" || do { echo "Error: unexpected output from \"$DOCKER version\""; exit 1; }
  $DOCKER version | grep -q "^Server version:" || do { 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.
proc initcontainer {
  test $1 || do { echo "Error: platform name must be specified"; exit 1; }

  setglobal DFILE = ""$ROOTDIR/contrib/docker/$1""
  test -f $DFILE || do { echo "Error: docker file $DFILE not found"; exit 1; }

  setglobal CONTAINER = ""hg-dockerrpm-$1""
  setglobal DBUILDUSER = 'build'
  shell {
    cat $DFILE
    if test $[uname] = "Darwin"  {
        # 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
    }
  } | $DOCKER build --tag $CONTAINER -
}