#!/bin/bash
# Copyright (c) 2019 Red Hat, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# Make a list of bindep dependencies and a collection of built binary
# wheels for the repo in question as well as its python dependencies.
# Install javascript tools as well to support python that needs javascript
# at build time.
set -ex

RELEASE=$(source /etc/os-release; echo $ID)

# NOTE(pabelanger): Allow users to force either microdnf or dnf as a package
# manager.
PKGMGR="${PKGMGR:-}"
PKGMGR_OPTS="${PKGMGR_OPTS:-}"
PKGMGR_PRESERVE_CACHE="${PKGMGR_PRESERVE_CACHE:-}"

PYCMD="${PYCMD:=/usr/bin/python3}"
PIPCMD="${PIPCMD:=$PYCMD -m pip}"

if [ -z $PKGMGR ]; then
    # Expect dnf to be installed, however if we find microdnf default to it.
    PKGMGR=/usr/bin/dnf
    if [ -f "/usr/bin/microdnf" ]; then
        PKGMGR=/usr/bin/microdnf
    fi
fi

if [ "$PKGMGR" = "/usr/bin/microdnf" ]
then
    if [ -z "${PKGMGR_OPTS}" ]; then
        # NOTE(pabelanger): skip install docs and weak dependencies to
        # make smaller images. Sadly, setting these in dnf.conf don't
        # appear to work.
        PKGMGR_OPTS="--nodocs --setopt install_weak_deps=0"
    fi
fi

# NOTE(pabelanger): Ensure all the directory we use exists regardless
# of the user first creating them or not.
mkdir -p /output/bindep
mkdir -p /output/wheels
mkdir -p /tmp/src

cd /tmp/src

function install_bindep {
    # Protect from the bindep builder image use of the assemble script
    # to produce a wheel.  Note we append because we want all
    # sibling packages in here too
    if [ -f bindep.txt ] ; then
        bindep -l newline | sort >> /output/bindep/run.txt || true
        if [ "$RELEASE" == "centos" ] ; then
            bindep -l newline -b epel | sort >> /output/bindep/stage.txt || true
            grep -Fxvf /output/bindep/run.txt /output/bindep/stage.txt >> /output/bindep/epel.txt || true
            rm -rf /output/bindep/stage.txt
        fi
        compile_packages=$(bindep -b compile || true)
        if [ ! -z "$compile_packages" ] ; then
            $PKGMGR install -y $PKGMGR_OPTS ${compile_packages}
        fi
    fi
}

function install_wheels {
    # NOTE(pabelanger): If there are build requirements to install, do so.
    # However do not cache them as we do not want them in the final image.
    if [ -f /tmp/src/build-requirements.txt ] && [ ! -f /tmp/src/.build-requirements.txt ] ; then
        $PIPCMD install $CONSTRAINTS $PIP_OPTS --no-cache -r /tmp/src/build-requirements.txt
        touch /tmp/src/.build-requirements.txt
    fi
    # Build a wheel so that we have an install target.
    # pip install . in the container context with the mounted
    # source dir gets ... exciting, if setup.py exists.
    # We run sdist first to trigger code generation steps such
    # as are found in zuul, since the sequencing otherwise
    # happens in a way that makes wheel content copying unhappy.
    # pip wheel isn't used here because it puts all of the output
    # in the output dir and not the wheel cache, so it's not
    # possible to tell what is the wheel for the project and
    # what is the wheel cache.
    if [ -f setup.py ] ; then
        $PYCMD setup.py sdist bdist_wheel -d /output/wheels
    fi

    # Install everything so that the wheel cache is populated with
    # transitive depends. If a requirements.txt file exists, install
    # it directly so that people can use git url syntax to do things
    # like pick up patched but unreleased versions of dependencies.
    # Only do this for the main package (i.e. only write requirements
    # once).
    if [ -f /tmp/src/requirements.txt ] && [ ! -f /output/requirements.txt ] ; then
        $PIPCMD install $CONSTRAINTS $PIP_OPTS --cache-dir=/output/wheels -r /tmp/src/requirements.txt
        cp /tmp/src/requirements.txt /output/requirements.txt
    fi
    # If we didn't build wheels, we can skip trying to install it.
    if [ $(ls -1 /output/wheels/*whl 2>/dev/null | wc -l) -gt 0 ]; then
        $PIPCMD uninstall -y /output/wheels/*.whl
        $PIPCMD install $CONSTRAINTS $PIP_OPTS --cache-dir=/output/wheels /output/wheels/*whl
    fi
}

PACKAGES=$*
PIP_OPTS="${PIP_OPTS-}"

# bindep the main package
install_bindep

# go through ZUUL_SIBLINGS, if any, and build those wheels too
for sibling in ${ZUUL_SIBLINGS:-}; do
    pushd .zuul-siblings/${sibling}
    install_bindep
    popd
done

# Use a clean virtualenv for install steps to prevent things from the
# current environment making us not build a wheel.
# NOTE(pabelanger): We allow users to install distro python packages of
# libraries. This is important for projects that eventually want to produce
# an RPM or offline install.
$PYCMD -m venv /tmp/venv --system-site-packages --without-pip
source /tmp/venv/bin/activate

# If there is an upper-constraints.txt file in the source tree,
# use it in the pip commands.
if [ -f /tmp/src/upper-constraints.txt ] ; then
    cp /tmp/src/upper-constraints.txt /output/upper-constraints.txt
    CONSTRAINTS="-c /tmp/src/upper-constraints.txt"
fi

# If we got a list of packages, install them, otherwise install the
# main package.
if [[ $PACKAGES ]] ; then
    $PIPCMD install $CONSTRAINTS $PIP_OPTS --cache-dir=/output/wheels $PACKAGES
    for package in $PACKAGES ; do
      echo "$package" >> /output/packages.txt
    done
else
    install_wheels
fi

# go through ZUUL_SIBLINGS, if any, and build those wheels too
for sibling in ${ZUUL_SIBLINGS:-}; do
    pushd .zuul-siblings/${sibling}
    install_wheels
    popd
done

if [ -z $PKGMGR_PRESERVE_CACHE ]; then
  $PKGMGR clean all
  rm -rf /var/cache/{dnf,yum}
fi

rm -rf /var/lib/dnf/history.*
rm -rf /var/log/{dnf.*,hawkey.log}
rm -rf /tmp/venv
