#!/bin/bash
# This file is part of cloud-init. See LICENSE file for license information.
#
# shellcheck disable=2015,2016,2039,2162,2166

set -u

VERBOSITY=0
KEEP=false
CONTAINER=""
DEFAULT_WAIT_MAX=30

error() { echo "$@" 1>&2; }
fail() { [ $# -eq 0 ] || error "$@"; exit 1; }
errorrc() { local r=$?; error "$@" "ret=$r"; return $r; }

Usage() {
    cat <<EOF
Usage: ${0##*/} [ options ] [images:]image-ref

    This utility can makes it easier to run tests, build rpm and source rpm
        generation inside a LXC of the specified version of CentOS.

    To see images available, run 'lxc image list images:'
    Example input:
       centos/7
       opensuse/42.3
       debian/10

    options:
      -a | --artifacts DIR   copy build artifacts out to DIR.
                             by default artifacts are not copied out.
           --dirty           apply local changes before running tests.
                             If not provided, a clean checkout of branch is
                             tested.  Inside container, changes are in
                             local-changes.diff.
      -k | --keep            keep container after tests
           --pyexe V         python version to use.  Default=auto.
                             Should be name of an executable.
                             ('python2' or 'python3')
      -p | --package         build a binary package (.deb or .rpm)
      -s | --source-package  build source package (debuild -S or srpm)
      -u | --unittest        run unit tests

    Example:
      * ${0##*/} --package --source-package --unittest centos/6
EOF
}

bad_Usage() { Usage 1>&2; [ $# -eq 0 ] || error "$@"; return 1; }
cleanup() {
    if [ -n "$CONTAINER" ]; then
        if [ "$KEEP" = "true" ]; then
            error "not deleting container '$CONTAINER' due to --keep"
        else
            delete_container "$CONTAINER"
        fi
    fi
}

debug() {
    local level=${1}; shift;
    [ "${level}" -gt "${VERBOSITY}" ] && return
    error "${@}"
}


inside_as() {
    # inside_as(container_name, user, cmd[, args])
    # executes cmd with args inside container as user in users home dir.
    local name="$1" user="$2"
    shift 2
    if [ "$user" = "root" ]; then
        inside "$name" "$@"
        return
    fi
    local stuffed="" b64=""
    stuffed=$(getopt --shell sh --options "" -- -- "$@")
    stuffed=${stuffed# -- }
    b64=$(printf "%s\n" "$stuffed" | base64 --wrap=0)
    inside "$name" su "$user" -c \
        'cd; eval set -- "$(echo '"$b64"' | base64 --decode)" && exec "$@"';
}

inside_as_cd() {
    local name="$1" user="$2" dir="$3"
    shift 3
    inside_as "$name" "$user" sh -c 'cd "$0" && exec "$@"' "$dir" "$@"
}

inside() {
    local name="$1"
    shift
    lxc exec "$name" -- "$@"
}

inject_cloud_init(){
    # take current cloud-init git dir and put it inside $name at
    # ~$user/cloud-init.
    local name="$1" user="$2" dirty="$3"
    local dname="cloud-init" gitdir="" commitish=""
    gitdir=$(git rev-parse --git-dir) || {
        errorrc "Failed to get git dir in $PWD";
        return
    }
    local t=${gitdir%/*}
    case "$t" in
        */worktrees) 
            if [ -f "${t%worktrees}/config" ]; then
                gitdir="${t%worktrees}"
            fi
    esac

    # attempt to get branch name.
    commitish=$(git rev-parse --abbrev-ref HEAD) || {
        errorrc "Failed git rev-parse --abbrev-ref HEAD"
        return
    }
    if [ "$commitish" = "HEAD" ]; then
        # detached head
        commitish=$(git rev-parse HEAD) || {
            errorrc "failed git rev-parse HEAD"
            return
        }
    fi

    local local_changes=false
    if ! git diff --quiet "$commitish"; then
        # there are local changes not committed.
        local_changes=true
        if [ "$dirty" = "false" ]; then
            error "WARNING: You had uncommitted changes.  Those changes will "
            error "be put into 'local-changes.diff' inside the container. "
            error "To test these changes you must pass --dirty."
        fi
    fi

    debug 1 "collecting ${gitdir} ($dname) into user $user in $name."
    tar -C "${gitdir}" -cpf - . |
        inside_as "$name" "$user" sh -ec '
            dname=$1
            commitish=$2
            rm -Rf "$dname"
            mkdir -p $dname/.git
            cd $dname/.git
            tar -xpf -
            cd ..
            git config core.bare false
            out=$(git checkout $commitish 2>&1) ||
                { echo "failed git checkout $commitish: $out" 1>&2; exit 1; }
            out=$(git checkout . 2>&1) ||
                { echo "failed git checkout .: $out" 1>&2; exit 1; }
            ' extract "$dname" "$commitish"
    [ "${PIPESTATUS[*]}" = "0 0" ] || {
        error "Failed to push tarball of '$gitdir' into $name" \
            " for user $user (dname=$dname)"
        return 1
    }

    echo "local_changes=$local_changes dirty=$dirty"
    if [ "$local_changes" = "true" ]; then
        git diff "$commitish" |
            inside_as "$name" "$user" sh -exc '
                cd "$1"
                if [ "$2" = "true" ]; then
                    git apply
                else
                    cat > local-changes.diff
                fi
                ' insert_changes "$dname" "$dirty"
        [ "${PIPESTATUS[*]}" = "0 0" ] || {
            error "Failed to apply local changes."
            return 1
        }
    fi

    return 0
}

get_os_info_in() {
    # prep the container (install very basic dependencies)
    [ -n "${OS_VERSION:-}" -a -n "${OS_NAME:-}" ] && return 0
    data=$(run_self_inside "$name" os_info) ||
        { errorrc "Failed to get os-info in container $name"; return; }
    eval "$data" && [ -n "${OS_VERSION:-}" -a -n "${OS_NAME:-}" ] || return
    debug 1 "determined $name is $OS_NAME/$OS_VERSION"
}

os_info() {
    get_os_info || return
    echo "OS_NAME=$OS_NAME"
    echo "OS_VERSION=$OS_VERSION"
}

get_os_info() {
    # run inside container, set OS_NAME, OS_VERSION
    # example OS_NAME are centos, debian, opensuse
    [ -n "${OS_NAME:-}" -a -n "${OS_VERSION:-}" ] && return 0
    if [ -f /etc/os-release ]; then
        OS_NAME=$(sh -c '. /etc/os-release; echo $ID')
        OS_VERSION=$(sh -c '. /etc/os-release; echo $VERSION_ID')
        if [ -z "$OS_VERSION" ]; then
            local pname=""
            pname=$(sh -c '. /etc/os-release; echo $PRETTY_NAME')
            case "$pname" in
                *buster*) OS_VERSION=10;;
                *sid*) OS_VERSION="sid";;
            esac
        fi
    elif [ -f /etc/centos-release ]; then
        local line=""
        read line < /etc/centos-release
        case "$line" in
            CentOS\ *\ 6.*) OS_VERSION="6"; OS_NAME="centos";;
        esac
    fi
    [ -n "${OS_NAME:-}" -a -n "${OS_VERSION:-}" ] ||
        { error "Unable to determine OS_NAME/OS_VERSION"; return 1; }
}

yum_install() {
    local n=0 max=10 ret
    bcmd="yum install --downloadonly --assumeyes --setopt=keepcache=1"
    while n=$((n+1)); do
       error ":: running $bcmd $* [$n/$max]"
       $bcmd "$@"
       ret=$?
       [ $ret -eq 0 ] && break
       [ $n -ge $max ] && { error "gave up on $bcmd"; exit $ret; }
       nap=$((n*5))
       error ":: failed [$ret] ($n/$max). sleeping $nap."
       sleep $nap
    done
    error ":: running yum install --cacheonly --assumeyes $*"
    yum install --cacheonly --assumeyes "$@"
}

zypper_install() {
    local pkgs="$*"
    set -- zypper --non-interactive --gpg-auto-import-keys install \
        --auto-agree-with-licenses "$@"
    debug 1 ":: installing $pkgs with zypper: $*"
    "$@"
}

apt_install() {
    apt-get update -q && apt-get install --no-install-recommends "$@"
}

install_packages() {
    get_os_info || return
    case "$OS_NAME" in
        centos) yum_install "$@";;
        opensuse) zypper_install "$@";;
        debian|ubuntu) apt_install "$@";;
        *) error "Do not know how to install packages on ${OS_NAME}";
           return 1;;
    esac
}

prep() {
    # we need some very basic things not present in the container.
    #  - git
    #  - tar (CentOS 6 lxc container does not have it)
    #  - python-argparse (or python3)
    local needed="" pair="" pkg="" cmd="" needed=""
    local pairs="tar:tar git:git"
    local pyexe="$1"
    get_os_info
    local py2pkg="python2" py3pkg="python3"
    case "$OS_NAME" in
        opensuse)
            py2pkg="python-base"
            py3pkg="python3-base";;
    esac

    case "$pyexe" in
        python2) pairs="$pairs python2:$py2pkg";;
        python3) pairs="$pairs python3:$py3pkg";;
    esac

    for pair in $pairs; do
        pkg=${pair#*:}
        cmd=${pair%%:*}
        command -v "$cmd" >/dev/null 2>&1 || needed="${needed} $pkg"
    done
    if [ "$OS_NAME" = "centos" -a "$pyexe" = "python2" ]; then
        python -c "import argparse" >/dev/null 2>&1 ||
            needed="${needed} python-argparse"
    fi
    needed=${needed# }
    if [ -z "$needed" ]; then
        error "No prep packages needed"
        return 0
    fi
    error "Installing prep packages: ${needed}"
    # shellcheck disable=SC2086
    set -- $needed
    install_packages "$@"
}

nose() {
    local pyexe="$1" cmd=""
    shift
    get_os_info
    if [ "$OS_NAME/$OS_VERSION" = "centos/6" ]; then
        cmd="nosetests"
    else
        cmd="$pyexe -m nose"
    fi
    ${cmd} "$@"
}

is_done_cloudinit() {
    [ -e "/run/cloud-init/result.json" ]
    _RET=""
}

is_done_systemd() {
    local s="" num="$1"
    s=$(systemctl is-system-running 2>&1);
    _RET="$? $s"
    case "$s" in
        initializing|starting) return 1;;
        *[Ff]ailed*connect*bus*)
            # warn if not the first run.
            [ "$num" -lt 5 ] ||
                error "Failed to connect to systemd bus [${_RET%% *}]";
            return 1;;
    esac
    return 0
}

is_done_other() {
    local out=""
    out=$(getent hosts ubuntu.com 2>&1)
    return
}

wait_inside() {
    local name="$1" max="${2:-${DEFAULT_WAIT_MAX}}" debug=${3:-0}
    local i=0 check="is_done_other";
    if [ -e /run/systemd ]; then
        check=is_done_systemd
    elif [ -x /usr/bin/cloud-init ]; then
        check=is_done_cloudinit
    fi
    [ "$debug" != "0" ] && debug 1 "check=$check"
    while ! $check $i && i=$((i+1)); do
        [ "$i" -ge "$max" ] && exit 1
        [ "$debug" = "0" ] || echo -n .
        sleep 1
    done
    if [ "$debug" != "0" ]; then
        read up _ </proc/uptime
        debug 1 "[$name ${i:+done after $i }up=$up${_RET:+ ${_RET}}]"
    fi
}

wait_for_boot() {
    local name="$1"
    local out="" ret="" wtime=$DEFAULT_WAIT_MAX
    get_os_info_in "$name"
    [ "$OS_NAME" = "debian" ] && wtime=300 &&
        debug 1 "on debian we wait for ${wtime}s"
    debug 1 "waiting for boot of $name"
    run_self_inside "$name" wait_inside "$name" "$wtime" "$VERBOSITY" ||
        { errorrc "wait inside $name failed."; return; }

    if [ ! -z "${http_proxy-}" ]; then
        if [ "$OS_NAME" = "centos" ]; then
            debug 1 "configuring proxy ${http_proxy}"
            inside "$name" sh -c "echo proxy=$http_proxy >> /etc/yum.conf"
            inside "$name" sed -i s/enabled=1/enabled=0/ \
                /etc/yum/pluginconf.d/fastestmirror.conf
            inside "$name" sh -c "sed -i '/^#baseurl=/s/#//' /etc/yum.repos.d/*.repo"
        else
            debug 1 "do not know how to configure proxy on $OS_NAME"
        fi
    fi
}

start_container() {
    local src="$1" name="$2"
    debug 1 "starting container $name from '$src'"
    lxc launch "$src" "$name" || {
        errorrc "Failed to start container '$name' from '$src'";
        return
    }
    CONTAINER=$name
    wait_for_boot "$name"
}

delete_container() {
    debug 1 "removing container $1 [--keep to keep]"
    lxc delete --force "$1"
}

run_self_inside() {
    # run_self_inside(container, args)
    local name="$1"
    shift
    inside "$name" bash -s "$@" <"$0"
}

run_self_inside_as_cd() {
    local name="$1" user="$2" dir="$3"
    shift 3
    inside_as_cd "$name" "$user" "$dir" bash -s "$@" <"$0"
}

main() {
    local short_opts="a:hknpsuv"
    local long_opts="artifacts:,dirty,help,keep,name:,pyexe:,package,source-package,unittest,verbose"
    local getopt_out=""
    getopt_out=$(getopt --name "${0##*/}" \
        --options "${short_opts}" --long "${long_opts}" -- "$@") &&
        eval set -- "${getopt_out}" ||
        { bad_Usage; return; }

    local cur="" next=""
    local package=false srcpackage=false unittest="" name=""
    local dirty=false pyexe="auto" artifact_d="."

    while [ $# -ne 0 ]; do
        cur="${1:-}"; next="${2:-}";
        case "$cur" in
            -a|--artifacts) artifact_d="$next";;
               --dirty) dirty=true;;
            -h|--help) Usage ; exit 0;;
            -k|--keep) KEEP=true;;
            -n|--name) name="$next"; shift;;
               --pyexe) pyexe=$next; shift;;
            -p|--package) package=true;;
            -s|--source-package) srcpackage=true;;
            -u|--unittest) unittest=1;;
            -v|--verbose) VERBOSITY=$((VERBOSITY+1));;
            --) shift; break;;
        esac
        shift;
    done

    [ $# -eq 1 ] || { bad_Usage "Expected 1 arg, got $# ($*)"; return; }
    local img_ref_in="$1"
    case "${img_ref_in}" in
        *:*) img_ref="${img_ref_in}";;
        *) img_ref="images:${img_ref_in}";;
    esac

    # program starts here
    local out="" user="ci-test" cdir="" home=""
    home="/home/$user"
    cdir="$home/cloud-init"
    if [ -z "$name" ]; then
        if out=$(petname 2>&1); then
            name="ci-${out}"
        elif out=$(uuidgen -t 2>&1); then
            name="ci-${out%%-*}"
        else
            error "Must provide name or have petname or uuidgen"
            return 1
        fi
    fi

    trap cleanup EXIT

    start_container "$img_ref" "$name" ||
        { errorrc "Failed to start container for $img_ref"; return; }

    get_os_info_in "$name" ||
        { errorrc "failed to get os_info in $name"; return; }

    if [ "$pyexe" = "auto" ]; then
        case "$OS_NAME/$OS_VERSION" in
            centos/*|opensuse/*) pyexe=python2;;
            *) pyexe=python3;;
        esac
        debug 1 "set pyexe=$pyexe for $OS_NAME/$OS_VERSION"
    fi

    # prep the container (install very basic dependencies)
    run_self_inside "$name" prep "$pyexe" ||
        { errorrc "Failed to prep container $name"; return; }

    # add the user
    inside "$name" useradd "$user" --create-home "--home-dir=$home" ||
        { errorrc "Failed to add user '$user' in '$name'"; return 1; }

    debug 1 "inserting cloud-init"
    inject_cloud_init "$name" "$user" "$dirty" || {
        errorrc "FAIL: injecting cloud-init into $name failed."
        return
    }

    inside_as_cd "$name" root "$cdir" \
        $pyexe ./tools/read-dependencies "--distro=${OS_NAME}" \
            --test-distro || {
        errorrc "FAIL: failed to install dependencies with read-dependencies"
        return
    }

    local errors=( )
    inside_as_cd "$name" "$user" "$cdir" git status || {
        errorrc "git checkout failed."
        errors[${#errors[@]}]="git checkout";
    }

    if [ -n "$unittest" ]; then
        debug 1 "running unit tests."
        run_self_inside_as_cd "$name" "$user" "$cdir" nose "$pyexe" \
            tests/unittests cloudinit/ || {
                errorrc "nosetests failed.";
                errors[${#errors[@]}]="nosetests"
            }
    fi

    local build_pkg="" build_srcpkg="" pkg_ext="" distflag=""
    case "$OS_NAME" in
        centos) distflag="--distro=redhat";;
        opensuse) distflag="--distro=suse";;
    esac

    case "$OS_NAME" in
        debian|ubuntu)
            build_pkg="./packages/bddeb -d" 
            build_srcpkg="./packages/bddeb -S -d"
            pkg_ext=".deb";;
        centos|opensuse)
            build_pkg="./packages/brpm $distflag"
            build_srcpkg="./packages/brpm $distflag --srpm"
            pkg_ext=".rpm";;
    esac
    if [ "$srcpackage" = "true" ]; then
        [ -n "$build_srcpkg" ] || {
            error "Unknown package command for $OS_NAME"
            return 1
        }
        debug 1 "building source package with $build_srcpkg."
        # shellcheck disable=SC2086
        inside_as_cd "$name" "$user" "$cdir" $pyexe $build_srcpkg || {
            errorrc "failed: $build_srcpkg";
            errors[${#errors[@]}]="source package"
        }
    fi

    if [ "$package" = "true" ]; then
        [ -n "$build_pkg" ] || {
            error "Unknown build source command for $OS_NAME"
            return 1
        }
        debug 1 "building binary package with $build_pkg."
        # shellcheck disable=SC2086
        inside_as_cd "$name" "$user" "$cdir" $pyexe $build_pkg || {
            errorrc "failed: $build_pkg";
            errors[${#errors[@]}]="binary package"
        }
    fi

    if [ -n "$artifact_d" ] &&
        [ "$package" = "true" -o "$srcpackage" = "true" ]; then
        local art=""
        artifact_d="${artifact_d%/}/"
        [ -d "${artifact_d}" ] || mkdir -p "$artifact_d" || {
            errorrc "failed to create artifact dir '$artifact_d'"
            return
        }

        for art in $(inside "$name" sh -c "echo $cdir/*${pkg_ext}"); do
            lxc file pull "$name/$art" "$artifact_d" || {
                errorrc "Failed to pull '$name/$art' to ${artifact_d}"
                errors[${#errors[@]}]="artifact copy: $art"
            }
            debug 1 "wrote ${artifact_d}${art##*/}"
        done
    fi

    if [ "${#errors[@]}" != "0" ]; then
        local e=""
        error "there were ${#errors[@]} errors."
        for e in "${errors[@]}"; do
            error "  $e"
        done
        return 1
    fi
    return 0
}

case "${1:-}" in
    prep|os_info|wait_inside|nose) _n=$1; shift; "$_n" "$@";;
    *) main "$@";;
esac

# vi: ts=4 expandtab