#!/bin/bash
# -*- coding: utf-8; mode: shell-script-mode; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- vim:fenc=utf-8:filetype=sh:et:sw=4:ts=4:sts=4
#
# Copyright (c) 2008-2012 The MacPorts Project
# Copyright (c) 2002-2007 Juan Manuel Palacios <jmpp@macports.org>, The MacPorts Project.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. Neither the name of The MacPorts Project nor the
#    names of its contributors may be used to endorse or promote products
#    derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# postflight
# $Id$


#set -x

# Script identification ('cause more often than not the svn Id is not expanded):
VERSION=2.3.1

# Abstraction variables:
PREFIX="@prefix@"
BINPATH=${PREFIX}/bin
SBINPATH=${PREFIX}/sbin
CONFIGPATH=${PREFIX}/etc/macports
MANPAGES=${PREFIX}/share/man
DSCL=/usr/bin/dscl
RUNUSR=macports
TCLSH="@TCLSH@"
TCL_PACKAGE_PATH="@TCL_PACKAGE_PATH@"
TIMESTAMP=$(date +"%Y-%m-%d_at_%H:%M:%S")
BACKUP_SUFFIX=macports-saved_${TIMESTAMP}
OUR_BASESTRING="MacPorts Installer addition"
OUR_STRING="${OUR_BASESTRING} on ${TIMESTAMP}"

OLD_MACPORTS_TCL_DIR=${PREFIX}/share/macports/Tcl
OLD_TCL_PACKAGE_DIR=/Library/Tcl

# Create config files from defaults if not present
function setup_configs {
    for f in archive_sites.conf macports.conf pubkeys.conf sources.conf variants.conf ; do
        if [[ ! -f ${CONFIGPATH}/${f} ]]; then
            echo "Copying ${f}.default to ${f}"
            /bin/cp "${CONFIGPATH}/${f}.default" "${CONFIGPATH}/${f}"
            /bin/chmod 644 "${CONFIGPATH}/${f}"
        fi
    done
}

# Command to update the MacPorts installation through "selfupdate":
function update_macports {
    SCRIPT_DIR=$(dirname "$0")
    # Add [default] tag to the central MacPorts repository, if it isn't already
    echo "Adding [default] tag to sources.conf if needed..."
    "${TCLSH}" "${SCRIPT_DIR}/upgrade_sources_conf_default.tcl" "${PREFIX}"
    # Convert image directories (and direct mode installs) to image archives
    echo "Updating port image format..."
    "${TCLSH}" "${SCRIPT_DIR}/images_to_archives.tcl"
    "${TCLSH}" "${SCRIPT_DIR}/dedup_portfiles.tcl"

    echo "Synchronizing the MacPorts installation with the project's rsync server..."
    if ! "${BINPATH}/port" -v selfupdate; then 
        echo "An attempt to synchronize your recent MacPorts installation with the project's rsync server failed!"
        echo "Please run 'sudo port -d selfupdate' manually to find out the cause of the error."
    else
        echo "Successful!"
    fi
}

# Through this command we write an environment variable to an appropriate shell configuration file,
# backing up the original only if it exists and if it doesn't contain the ${OUR_STRING} identification string,
# which hints that we've already tweaked it and therefore already backed it up.
function write_setting () {
    if [[ -f "${HOME}/.${CONF_FILE}" ]] && ! grep "${OUR_BASESTRING}" "${HOME}/.${CONF_FILE}" > /dev/null; then
        echo "Backing up your ${HOME}/.${CONF_FILE} shell confguration file as ${HOME}/.${CONF_FILE}.${BACKUP_SUFFIX} before adapting it for MacPorts."
        /bin/cp -fp "${HOME}/.${CONF_FILE}" "${HOME}/.${CONF_FILE}.${BACKUP_SUFFIX}" || {
            echo "An attempt to backup your original configuration file failed! Please set your MacPorts compatible environment manually."
            update_macports
            exit 1
        }
        echo -e "\n##\n# Your previous ${HOME}/.${CONF_FILE} file was backed up as ${HOME}/.${CONF_FILE}.${BACKUP_SUFFIX}\n##" >> "${HOME}/.${CONF_FILE}"
    fi
    {
        echo -e "\n# ${OUR_STRING}: adding an appropriate ${1} variable for use with MacPorts."
        echo "${ENV_COMMAND} ${1}${ASSIGN}${2}"
        echo -e "# Finished adapting your ${1} environment variable for use with MacPorts.\n"
    } >> "${HOME}/.${CONF_FILE}"
    chown "${USER}" "${HOME}/.${CONF_FILE}" || echo "Warning: unable to adapt permissions on your ${HOME}/.${CONF_FILE} shell configuration file!"
    echo "An appropriate ${1} variable has been added to your shell environment by the MacPorts installer."
}

function cleanup_man () {
    # Remove old non-compressed man pages
    echo -e "\nRemoving old man pages..."
    MAN1="port.1"
    MAN5="macports.conf.5"
    MAN7="portfile.7 portstyle.7 porthier.7 portgroup.7"
    for m in ${MAN1}; do rm -vf "${MANPAGES}/man1/$m" ; done
    for m in ${MAN5}; do rm -vf "${MANPAGES}/man5/$m" ; done
    for m in ${MAN7}; do rm -vf "${MANPAGES}/man7/$m" ; done
    echo -e "Done.\n"
}

# delete macports1.0 link from old tcl package dir
function delete_old_tcl_package_link {
    # delete old link if present
    if [[ -e "${OLD_TCL_PACKAGE_DIR}/macports1.0" ]]; then
        rm -vrf "${OLD_TCL_PACKAGE_DIR}/macports1.0"
	fi

    # delete old macports1.0 link from new tcl package dir if present
    if [[ -L "${TCL_PACKAGE_PATH}/macports1.0" ]]; then
        rm -vrf "${TCL_PACKAGE_PATH}/macports1.0"
    fi
}

# delete the old tcl package location in share/macports/Tcl
function delete_old_tcl_packages {
    if [[ -d "${OLD_MACPORTS_TCL_DIR}" ]]; then
        rm -vrf "${OLD_MACPORTS_TCL_DIR}"
    fi
}

# create the user to use for privilege dropping
function create_run_user {
    DSEDITGROUP=/usr/sbin/dseditgroup
    if ! ${DSCL} -q . -read "/Groups/${RUNUSR}" > /dev/null 2>&1 ; then
        echo "Creating group \"${RUNUSR}\""
        ${DSEDITGROUP} -q -o create "${RUNUSR}"
    fi
    if ! ${DSCL} -q . -list "/Users/${RUNUSR}" > /dev/null 2>&1 ; then
        echo "Creating user \"${RUNUSR}\""
        NEXTUID=501
        while [[ -n "$(${DSCL} -q /Search -search /Users UniqueID $NEXTUID)" ]]; do
            let "NEXTUID=NEXTUID+1"
        done
        ${DSCL} -q . -create "/Users/${RUNUSR}" UniqueID $NEXTUID

        # These are implicitly added on Mac OSX Lion.  AuthenticationAuthority
        # causes the user to be visible in the Users & Groups Preference Pane,
        # and the others are just noise, so delete them.
        # https://trac.macports.org/ticket/30168
        ${DSCL} -q . -delete "/Users/${RUNUSR}" AuthenticationAuthority
        ${DSCL} -q . -delete "/Users/${RUNUSR}" PasswordPolicyOptions
        ${DSCL} -q . -delete "/Users/${RUNUSR}" dsAttrTypeNative:KerberosKeys
        ${DSCL} -q . -delete "/Users/${RUNUSR}" dsAttrTypeNative:ShadowHashData

        ${DSCL} -q . -create "/Users/${RUNUSR}" RealName MacPorts
        ${DSCL} -q . -create "/Users/${RUNUSR}" Password "*"
        ${DSCL} -q . -create "/Users/${RUNUSR}" PrimaryGroupID "$(${DSCL} -q . -read "/Groups/${RUNUSR}" PrimaryGroupID | /usr/bin/awk '{print $2}')"
        ${DSCL} -q . -create "/Users/${RUNUSR}" NFSHomeDirectory "${PREFIX}/var/macports/home"
        ${DSCL} -q . -create "/Users/${RUNUSR}" UserShell /usr/bin/false
    fi
    if [[ $(sw_vers -productVersion | /usr/bin/awk -F . '{print $2}') -eq 4 ]]; then
        GID=$(${DSCL} -q . -read "/Groups/${RUNUSR}" PrimaryGroupID | /usr/bin/awk '{print $2}')
        if [[ "$(${DSCL} -q . -read "/Users/${RUNUSR}" PrimaryGroupID 2>/dev/null | /usr/bin/awk '{print $2}')" != "$GID" ]]; then
            echo "Fixing PrimaryGroupID for user \"${RUNUSR}\""
            ${DSCL} -q . -create "/Users/${RUNUSR}" PrimaryGroupID "$GID"
            ${DSCL} -q . -create "/Users/${RUNUSR}" RealName MacPorts
        fi
    fi
    if [[ "$(${DSCL} -q . -read "/Users/${RUNUSR}" NFSHomeDirectory)" = "NFSHomeDirectory: /var/empty" ]]; then
        echo "Updating home directory location for user \"${RUNUSR}\""
        ${DSCL} -q . -create "/Users/${RUNUSR}" NFSHomeDirectory "${PREFIX}/var/macports/home"
    fi
}

echo "The MacPorts Project, postflight script version ${VERSION}: checking the shell environment for user \"${USER}\"."

# create macports user
create_run_user
# Set up config files
setup_configs

# Remove old stuff
cleanup_man
delete_old_tcl_package_link
delete_old_tcl_packages

# Determine the user's shell, in order to choose an appropriate configuration file we'll be tweaking.
# Exit nicely if the shell is any other than bash or tcsh, as that's considered non-standard.
USHELL=$(${DSCL} . -read "/Users/${USER}" shell | awk -F'/' '{print $NF}') || {
    echo "An attempt to determine your shell name failed! Please set your MacPorts compatible environment manually."
    update_macports
    exit 1
}
case "${USHELL}" in
    tcsh)
        echo "Detected the tcsh shell."
        LOGIN_FLAG=""
        ENV_COMMAND="setenv"
        ASSIGN=" "
        if [[ -f "${HOME}/.tcshrc" ]]; then
            CONF_FILE=tcshrc
        elif [[ -f "${HOME}/.cshrc" ]]; then
            CONF_FILE=cshrc
        else
            CONF_FILE=tcshrc
        fi
        ;;
    bash)
        echo "Detected the bash shell."
        LOGIN_FLAG="-l"
        ENV_COMMAND="export"
        ASSIGN="="
        if [[ -f "${HOME}/.bash_profile" ]]; then
            CONF_FILE=bash_profile
        elif [[ -f "${HOME}/.bash_login" ]]; then
            CONF_FILE=bash_login
        else
            CONF_FILE=profile
        fi
        ;;
    *)
        echo "Unknown shell ($USHELL)! Please set your MacPorts compatible environment manually."
        update_macports
        exit 0
        ;;
esac


# Adding our setting to the PATH variable if not already there:
if "${SHELL}" ${LOGIN_FLAG} -c "/usr/bin/printenv PATH" | grep "${PREFIX}" > /dev/null; then
    echo "Your shell already has the right PATH environment variable for use with MacPorts!"
else
    write_setting PATH "\"${BINPATH}:${SBINPATH}:\$PATH\""
fi

# We gather the path into a variable of our own for faster operation:
ORIGINAL_MANPATH="$("${SHELL}" ${LOGIN_FLAG} -c "/usr/bin/printenv MANPATH")"
# Adding our setting to the MANPATH variable only if it exists:
if ! "${SHELL}" ${LOGIN_FLAG} -c "/usr/bin/env | grep MANPATH" > /dev/null || \
# and following that, if it's not empty:
  [[ -z "${ORIGINAL_MANPATH}" ]] || \
# or if it doesn't already contain our path:
  echo "${ORIGINAL_MANPATH}" | grep "${MANPAGES}" > /dev/null || \
# or if there's no empty component somewhere in the middle of it:
  echo "${ORIGINAL_MANPATH}" | grep :: > /dev/null || \
# or at the start of it:
  [[ -z "$(echo "${ORIGINAL_MANPATH}" | awk -F : '{print $1}')" ]] || \
# or at the end of it:
  [[ -z "$(echo "${ORIGINAL_MANPATH}" | awk -F : '{print $NF}')" ]]; then
    echo "Your shell already has the right MANPATH environment variable for use with MacPorts!"
else
    write_setting MANPATH "\"${MANPAGES}:\$MANPATH\""
fi

# Adding a DISPLAY variable only if we're running on Tiger or less and if it doesn't already exist:
if (($(sw_vers -productVersion | awk -F . '{print $2}') >= 5)) || "${SHELL}" ${LOGIN_FLAG} -c "/usr/bin/env | grep DISPLAY" > /dev/null; then
    echo "Your shell already has the right DISPLAY environment variable for use with MacPorts!"
else
    write_setting DISPLAY ":0"
fi


# Postflight script is done with its job, update MacPorts and exit gracefully!
update_macports
echo "You have successfully installed the MacPorts system. Launch a terminal and try it out!"
echo "Read the port(1) manual page and https://guide.macports.org/ for help."
echo "See https://www.macports.org/contact.php if you need to get in touch with The MacPorts Project."
exit 0