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#!/bin/bash
#
# runs dh_virtualenv to build the virtualenv in the build directory,
# and then runs the trial tests against the installed synapse.

set -e

export DH_VIRTUALENV_INSTALL_ROOT=/opt/venvs

# make sure that the virtualenv links to the specific version of python, by
# dereferencing the python3 symlink.
#
# Otherwise, if somebody tries to install (say) the stretch package on buster,
# they will get a confusing error about "No module named 'synapse'", because
# python won't look in the right directory. At least this way, the error will
# be a *bit* more obvious.
#
SNAKE=`readlink -e /usr/bin/python3`

# try to set the CFLAGS so any compiled C extensions are compiled with the most
# generic as possible x64 instructions, so that compiling it on a new Intel chip
# doesn't enable features not available on older ones or AMD.
#
# TODO: add similar things for non-amd64, or figure out a more generic way to
# do this.

case `dpkg-architecture -q DEB_HOST_ARCH` in
    amd64)
        export CFLAGS=-march=x86-64
        ;;
esac

# Use --builtin-venv to use the better `venv` module from CPython 3.4+ rather
# than the 2/3 compatible `virtualenv`.

dh_virtualenv \
    --install-suffix "matrix-synapse" \
    --builtin-venv \
    --setuptools \
    --python "$SNAKE" \
    --upgrade-pip \
    --preinstall="lxml" \
    --preinstall="mock" \
    --extra-pip-arg="--no-cache-dir" \
    --extra-pip-arg="--compile" \
    --extras="all"

PACKAGE_BUILD_DIR="debian/matrix-synapse-py3"
VIRTUALENV_DIR="${PACKAGE_BUILD_DIR}${DH_VIRTUALENV_INSTALL_ROOT}/matrix-synapse"
TARGET_PYTHON="${VIRTUALENV_DIR}/bin/python"

# we copy the tests to a temporary directory so that we can put them on the
# PYTHONPATH without putting the uninstalled synapse on the pythonpath.
tmpdir=`mktemp -d`
trap "rm -r $tmpdir" EXIT

cp -r tests "$tmpdir"

PYTHONPATH="$tmpdir" \
    "${TARGET_PYTHON}" -B -m twisted.trial --reporter=text -j2 tests

# build the config file
"${TARGET_PYTHON}" -B "${VIRTUALENV_DIR}/bin/generate_config" \
        --config-dir="/etc/matrix-synapse" \
        --data-dir="/var/lib/matrix-synapse" |
    perl -pe '
# tweak the paths to the tls certs and signing keys
/^tls_.*_path:/ and s/SERVERNAME/homeserver/;
/^signing_key_path:/ and s/SERVERNAME/homeserver/;

# tweak the pid file location
/^pid_file:/ and s#:.*#: "/var/run/matrix-synapse.pid"#;

# tweak the path to the log config
/^log_config:/ and s/SERVERNAME\.log\.config/log.yaml/;

# tweak the path to the media store
/^media_store_path:/ and s#/media_store#/media#;

# remove the server_name setting, which is set in a separate file
/^server_name:/ and $_ = "#\n# This is set in /etc/matrix-synapse/conf.d/server_name.yaml for Debian installations.\n# $_";

# remove the report_stats setting, which is set in a separate file
/^# report_stats:/ and $_ = "";

' > "${PACKAGE_BUILD_DIR}/etc/matrix-synapse/homeserver.yaml"


# add a dependency on the right version of python to substvars.
PYPKG=`basename $SNAKE`
echo "synapse:pydepends=$PYPKG" >> debian/matrix-synapse-py3.substvars