#!/bin/bash
set -e
##############################################################################
# Copyright (c) 2015 Ericsson AB and others.
# stefan.k.berg@ericsson.com
# jonas.bjurel@ericsson.com
# All rights reserved. This program and the accompanying materials
# are made available under the terms of the Apache License, Version 2.0
# which accompanies this distribution, and is available at
# http://www.apache.org/licenses/LICENSE-2.0
##############################################################################
#

############################################################################
# BEGIN of Exit handlers
#

do_exit () {
    CID=`cat $CID_FILE </dev/null`
    rm -f $CID_FILE
    rm -rf $CONTEXT_DIR
    set +e
    docker kill $CID > /dev/null 2>&1
    docker rm -f $CID > /dev/null 2>&1
    docker rmi -f $IID > /dev/null 2>&1
    set -e
}

#
# End of Exit handlers
############################################################################

trap do_exit SIGINT SIGTERM EXIT

context=$1
shift
USER_ID=`id -u`
USER=`whoami`
GROUP_ID=`id -g`

GITROOT=`git rev-parse --show-toplevel`
CID_FILE=`mktemp -u -t runcontext.XXXXXXXXXX`
CONTEXT_DIR=`mktemp -d ${GITROOT}/.docker_contextXXXXXX`

# If RSYNC_CONNECT_PROG is used, we need to copy all of
# the SSH structure, should one of the keys need to be
# used.
if [ -n "$RSYNC_CONNECT_PROG" -a -x $HOME/.ssh ]; then
    cp -rp $HOME/.ssh $CONTEXT_DIR
    rm -f $CONTEXT_DIR/.ssh/known_hosts
else
    mkdir $CONTEXT_DIR/.ssh
fi

# Disable verification of unknown keys
cat >> $CONTEXT_DIR/.ssh/config <<EOF
StrictHostKeyChecking=no
EOF

cat > $CONTEXT_DIR/Dockerfile <<EOF
FROM $context
$(env | egrep -i 'proxy|rsync' | sed 's/^/ENV /' | sed 's/=/ /')
RUN date || date
COPY .ssh  $HOME/.ssh
RUN chown -R $USER_ID:$GROUP_ID $HOME/.ssh
RUN chown -R $USER_ID:$GROUP_ID $HOME
RUN chmod 700 $HOME/.ssh
RUN /root/setcontext $USER $USER_ID $GROUP_ID $HOME
EOF

res=`docker build -q --force-rm $CONTEXT_DIR`
IID=`echo $res | sed 's/.* //'`

# Handle proxy settings passed to the context
if env | grep -iq .*proxy; then
    envfile="$(readlink -f $(dirname $0)/..)/environment.mk"

    test -n "$HTTP_PROXY" && my_http_proxy=$HTTP_PROXY
    test -n "$http_proxy" && my_http_proxy=$http_proxy

    test -n "$HTTPS_PROXY" && my_https_proxy=$HTTPS_PROXY
    test -n "$https_proxy" && my_https_proxy=$https_proxy

    test -n "$NO_PROXY" && my_no_proxy=$NO_PROXY
    test -n "$no_proxy" && my_no_proxy=$no_proxy

    # Make sure to add the Docker socket in no_proxy
    if [ -n "$my_no_proxy" ]; then
        my_no_proxy+=",/var/run/docker.sock"
    else
        my_no_proxy="/var/run/docker.sock"
    fi

    echo "Creating $envfile"
    echo "# This file is automatically generated by runcontext, do not edit!" > $envfile
    test -n "$my_http_proxy" && echo "export http_proxy=$my_http_proxy" >> $envfile
    test -n "$my_https_proxy" && echo "export https_proxy=$my_https_proxy" >> $envfile
    test -n "$my_no_proxy" && echo "export no_proxy=$my_no_proxy" >> $envfile
    test -n "$RSYNC_PROXY" && echo "export RSYNC_PROXY=$RSYNC_PROXY" >> $envfile
    test -n "$RSYNC_CONNECT_PROG" && echo "export RSYNC_CONNECT_PROG=$RSYNC_CONNECT_PROG" >> $envfile
    echo "export npm_config_registry=http://registry.npmjs.org/" >> $envfile
else
    echo "No need to generate environment.mk"
    rm -f $envfile
fi

# Evaluate the need for bind mounting the cache directory
if [ -n "$CACHEBASE" ]; then
    if echo $CACHEBASE | grep -q '^file://'; then
        CACHEMOUNT="-v $(echo $CACHEBASE | sed 's;file://;;'):$(echo $CACHEBASE | sed 's;file://;;')"
    fi
fi

RUN_CONTEXT_OPT="--cidfile $CID_FILE --privileged=true --rm -e HOME=$HOME -e CACHEDEBUG -e CACHETRANSPORT -e CACHEMAXAGE -e CACHEBASE -e BUILD_FUEL_PLUGINS -e MIRROR_UBUNTU -e MIRROR_UBUNTU_ROOT -e MIRROR_MOS_UBUNTU -e MIRROR_MOS_UBUNTU_ROOT -e MIRROR_FUEL -e LATEST_TARGET_UBUNTU -u $USER_ID:$GROUP_ID -w $PWD -v $GITROOT:$GITROOT -v /sys/fs/cgroup:/sys/fs/cgroup:ro $CACHEMOUNT"

# Passing "debug" puts up an interactive bash shell
if [ "$1" == "debug" ]; then
  echo command: docker run ${RUN_CONTEXT_OPT} $IID bash
  docker run -i -t ${RUN_CONTEXT_OPT} $IID bash
else
  echo command: docker run ${RUN_CONTEXT_OPT} $IID $@
  docker run -t ${RUN_CONTEXT_OPT} $IID $@
fi