#!/usr/bin/env impala-python
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# to you under the Apache License, Version 2.0 (the
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#   http://www.apache.org/licenses/LICENSE-2.0
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# Assembles the artifacts required to build docker containers into a single directory.
# Most artifacts are symlinked so need to be dereferenced (e.g. with tar -h) before
# being used as a build context.

import glob
import os
import shutil

IMPALA_HOME = os.environ["IMPALA_HOME"]
OUTPUT_DIR = os.path.join(IMPALA_HOME, "docker/build_context")
DOCKERFILE = os.path.join(IMPALA_HOME, "docker/impala_base/Dockerfile")

IMPALA_TOOLCHAIN = os.environ["IMPALA_TOOLCHAIN"]
IMPALA_GCC_VERSION = os.environ["IMPALA_GCC_VERSION"]
GCC_HOME = os.path.join(IMPALA_TOOLCHAIN, "gcc-{0}".format(IMPALA_GCC_VERSION))

# Ensure the output directory exists and is empty.
if os.path.exists(OUTPUT_DIR):
    shutil.rmtree(OUTPUT_DIR)
os.makedirs(OUTPUT_DIR)

os.symlink(os.path.relpath(DOCKERFILE, OUTPUT_DIR),
    os.path.join(OUTPUT_DIR, "Dockerfile"))

BIN_DIR = os.path.join(OUTPUT_DIR, "bin")
LIB_DIR = os.path.join(OUTPUT_DIR, "lib")
os.mkdir(BIN_DIR)
os.mkdir(LIB_DIR)


def symlink_file_into_dir(src_file, dst_dir):
    """Helper to symlink 'src_file' into 'dst_dir'."""
    os.symlink(src_file, os.path.join(dst_dir, os.path.basename(src_file)))


# Impala binaries and native dependencies.
for bin in ["impalad", "statestored", "catalogd", "libfesupport.so"]:
    symlink_file_into_dir(os.path.join(IMPALA_HOME, "be/build/latest/service", bin),
         BIN_DIR)
for lib in ["libstdc++", "libgcc"]:
    for so in glob.glob(os.path.join(GCC_HOME, "lib64/{0}*.so*".format(lib))):
        symlink_file_into_dir(so, LIB_DIR)
os.symlink(os.environ["IMPALA_KUDU_HOME"], os.path.join(OUTPUT_DIR, "kudu"))

# Impala jars and dependencies.
for glob_pattern in [os.path.join(IMPALA_HOME, "fe/target/dependency/*.jar"),
    os.path.join(IMPALA_HOME, "fe/target/impala-frontend-*.jar")]:
  for jar in glob.glob(glob_pattern):
      symlink_file_into_dir(jar, LIB_DIR)

# Templates for debug web pages.
os.symlink(os.path.join(IMPALA_HOME, "www"), os.path.join(OUTPUT_DIR, "www"))
# Scripts
symlink_file_into_dir(os.path.join(IMPALA_HOME, "docker/daemon_entrypoint.sh"), BIN_DIR)
# Minicluster configs
os.symlink(os.path.join(IMPALA_HOME, "fe/src/test/resources"),
    os.path.join(OUTPUT_DIR, "conf"))