#!/bin/sh
# Upstream makes use of “clknetsim” to test how well “chronyd” controls the
# system clocks in various conditions. Due to “clknetsim” not being available
# in Debian, let’s use autopkgtest facility to build it in a container and
# test “chronyd” from there.

set -e

testdir="$PWD/test/simulation"
clknetsim_ver=0a11a35
clknetsim_src=https://github.com/mlichvar/clknetsim/archive/"$clknetsim_ver"/clknetsim-"$clknetsim_ver".tar.gz
clknetsim_archive=$(basename "$clknetsim_src")

export CLKNETSIM_PATH="$AUTOPKGTEST_TMP"
export CLKNETSIM_CONNECT_TIMEOUT=100

# Always use the same seed to get deterministic results
export CLKNETSIM_RANDOM_SEED=24508

DEB_BUILD_ARCH=$(dpkg-architecture -qDEB_BUILD_ARCH)

# The simulation tests are only supported on Linux.
dpkg-architecture -ilinux-any || exit 77

prepare_clknetsim() {
    wget -P "$CLKNETSIM_PATH" "$clknetsim_src" 2>&1 || exit 77
    tar -xvzf "$CLKNETSIM_PATH"/"$clknetsim_archive" \
        -C "$CLKNETSIM_PATH" --strip-components=1 2>&1 || exit 77

    if [ ! -x "$CLKNETSIM_PATH/clknetsim" ] && [ ! -e "$CLKNETSIM_PATH/clknetsim.so" ]; then
        case "$DEB_BUILD_ARCH" in
            armel|armhf)
                CFLAGS="-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -D_TIME_BITS=64" make -C "$CLKNETSIM_PATH" 2>&1
                ;;
            *)
                make -C "$CLKNETSIM_PATH" 2>&1
                ;;
        esac
    fi
}

run_test() {
    cd "$testdir" && ./run
}

prepare_clknetsim && run_test