#! /bin/sh

# Copyright (c) The Exim Maintainters 2022 - 2023
# SPDX-License-Identifier: GPL-2.0-or-later

# Script to install Exim binaries in BIN_DIRECTORY, which is defined in
# the local Makefile. It expects to be run in a build directory. It needs
# to be run as root in order to make exim setuid to root. If exim runs setuid
# to (e.g.) exim, this script should be run as that user or root.

# This script also installs a default configuration file in CONFIGURE_FILE
# if there is no configuration file there, but only if CONFIGURE_FILE specifies
# single file. If it specifies a list, no action is taken.

# If a default configuration file is installed, the existence of the system
# aliases file is tested. A default, containing only comments, is installed if
# necessary.

# If INFO_DIRECTORY is defined in any of the local Makefiles, and the Exim doc
# directory contains the Texinfo documentation, this script also installs a
# the info files in INFO_DIRECTORY.

# If DESTDIR is defined, all file paths are prefixed with ${DESTDIR}, with the
# sole exception of the reference to the system aliases file in the default
# configuration, because it is assumed that Exim is not actually going to be
# run from this position. For backward compatibility, if DESTDIR is not
# defined, ROOT is used instead.

# The script can be made to output what it would do, without actually doing
# anything, by giving it the option "-n" (cf make). Arguments are the names
# of things to install. No arguments installs everything.

do_chown=yes
do_symlink=yes

while [ $# -gt 0 ] ; do
  case "$1" in
    -n)
      real="true || "
      ver="verification "
      com=": "
      echo $com ""
      echo $com "*** Verification mode only: no commands will actually be obeyed"
      echo $com "*** You can cut and paste the bits you want to a shell, etc"
      echo $com ""
      echo cd `pwd`
      ;;

    -no_chown)
      do_chown=no
      ;;

    -no_symlink)
      do_symlink=no
      ;;

    *)
      break
      ;;
  esac
  shift
done

# Get the values of BIN_DIRECTORY, CONFIGURE_FILE, INFO_DIRECTORY, NO_SYMLINK,
# SYSTEM_ALIASES_FILE, and EXE from the global Makefile (in the build
# directory). EXE is empty except in the Cygwin environment. In each case, keep
# the latest definition, thus respecting the Makefiles precedence. The sed
# sequences here are messy, but have to be very "basic" in order to work on
# Solaris, where the regular expressions in sed are primitive indeed. Modify at
# your peril.

BIN_DIRECTORY=`sed -n   -e '/^ *BIN_DIRECTORY *=/{s/^[^=]*= *//; s/ \{1,\}#.*//;s/ *$//;h;}' -e '${g;p;}' Makefile`
CONFIGURE_FILE=`sed -n -e '/^ *CONFIGURE_FILE *=/{s/^[^=]*= *//; s/ \{1,\}#.*//;s/ *$//;h;}' -e '${g;p;}' Makefile`
INFO_DIRECTORY=`sed -n -e '/^ *INFO_DIRECTORY *=/{s/^[^=]*= *//; s/ \{1,\}#.*//;s/ *$//;h;}' -e '${g;p;}' Makefile`
NO_SYMLINK=`sed -n         -e '/^ *NO_SYMLINK *=/{s/^[^=]*= *//; s/ \{1,\}#.*//;s/ *$//;h;}' -e '${g;p;}' Makefile`

CHOWN=`sed -n           -e '/^ *CHOWN_COMMAND *=/{s/^[^=]*= *//; s/ \{1,\}#.*//;s/ *$//;h;}' -e '${g;p;}' Makefile`
MV=`sed -n                 -e '/^ *MV_COMMAND *=/{s/^[^=]*= *//; s/ \{1,\}#.*//;s/ *$//;h;}' -e '${g;p;}' Makefile`

SYSTEM_ALIASES_FILE=`sed -n -e '/^ *SYSTEM_ALIASES_FILE *=/{s/^[^=]*= *//; s/ \{1,\}#.*//;s/ *$//;h;}' -e '${g;p;}' Makefile`
EXE=`sed -n                                 -e '/^ *EXE *=/{s/^[^=]*= *//; s/ \{1,\}#.*//;s/ *$//;h;}' -e '${g;p;}' Makefile`

# Set a default for SYSTEM_ALIASES_FILE

if [ "${SYSTEM_ALIASES_FILE}" = "" ] ; then
  SYSTEM_ALIASES_FILE=/etc/aliases
fi

# Allow INST_xx to over-ride xx
case "$INST_BIN_DIRECTORY"       in ?*) BIN_DIRECTORY="$INST_BIN_DIRECTORY";; esac
case "$INST_CONFIGURE_FILE"      in ?*) CONFIGURE_FILE="$INST_CONFIGURE_FILE";; esac
case "$INST_INFO_DIRECTORY"      in ?*) INFO_DIRECTORY="$INST_INFO_DIRECTORY";; esac
case "$INST_SYSTEM_ALIASES_FILE" in ?*) SYSTEM_ALIASES_FILE="$INST_SYSTEM_ALIASES_FILE";; esac

case "$INST_CHOWN"               in ?*) CHOWN="$INST_CHOWN";; esac
case "$INST_MV"                  in ?*) MV="$INST_MV";; esac

case "$INST_UID"     in '') INST_UID=root;;    *) INST_UID="$INST_UID";; esac
case "$INST_CP"      in '') CP=cp;;            *) CP="$INST_CP";; esac
case "$INST_LN"      in '') LN=ln;;            *) LN="$INST_LN";; esac
case "$INST_CHMOD"   in '') CHMOD=chmod;;      *) CHMOD="$INST_CHMOD";; esac
case "$INST_DIRNAME" in '') DIRNAME=dirname;;  *) DIRNAME="$INST_DIRNAME";; esac
case "$INST_MKDIR"   in '') MKDIR=mkdir;;      *) MKDIR="$INST_MKDIR";; esac

# Allow the user to over-ride xx
case "$inst_dest"    in ?*) BIN_DIRECTORY="$inst_dest";; esac
case "$inst_conf"    in ?*) CONFIGURE_FILE="$inst_conf";; esac
case "$inst_info"    in ?*) INFO_DIRECTORY="$inst_info";; esac
case "$inst_aliases" in ?*) SYSTEM_ALIASES_FILE="$inst_aliases";; esac

# Insert ${DESTDIR} at the start of all paths so that the whole thing can be
# installed under a different file root. For backwards compatibility, use
# ${ROOT} if ${DESTDIR} is not set. However, we need to save the value of
# the real system aliases file, and use that in the default configuration.

ACTUAL_SYSTEM_ALIASES_FILE=${SYSTEM_ALIASES_FILE}
DESTDIR=${DESTDIR:-${ROOT}}

BIN_DIRECTORY=${DESTDIR}${BIN_DIRECTORY}
CONFIGURE_FILE=${DESTDIR}${CONFIGURE_FILE}
SYSTEM_ALIASES_FILE=${DESTDIR}${SYSTEM_ALIASES_FILE}

if [ "${INFO_DIRECTORY}" != "" ] ; then
  INFO_DIRECTORY=${DESTDIR}${INFO_DIRECTORY}
fi

# Overrides of other things
case "$inst_uid"     in ?*) INST_UID="$inst_uid";; esac
case "$inst_cp"      in ?*) CP="$inst_cp";; esac
case "$inst_mv"      in ?*) MV="$inst_mv";; esac
case "$inst_ln"      in ?*) LN="$inst_ln";; esac
case "$inst_chown"   in ?*) CHOWN="$inst_chown";; esac
case "$inst_chmod"   in ?*) CHMOD="$inst_chmod";; esac
case "$inst_dirname" in ?*) DIRNAME="$inst_dirname";; esac
case "$inst_mkdir"   in ?*) MKDIR="$inst_mkdir";; esac

# chown is a special case; in at least one OS it is in /usr/etc instead
# of in /usr/bin, and therefore not likely to be on the path. Another OS
# has it in /usr/sbin. This fudge tries to cope with these variations.

# Otherwise, and for other commands, we assume that the normal PATH will
# give access to where they are on your operating system (normally /usr/bin
# or /bin).

if [ "${CHOWN}" = "chown" -a -x /usr/sbin/chown ] ; then
  CHOWN=/usr/sbin/chown
fi

if [ "${CHOWN}" = "chown" -a ! -f /usr/bin/chown -a -f /usr/etc/chown ] ; then
  CHOWN=/usr/etc/chown
fi

# The values of CHOWN and MV taken from the Makefile are sometimes set to
# "look_for_it", which causes a search of the usual suspects. This code is
# similar to that in exicyclog, but has to be fudged for upper/lower case
# distinctions.

for cmd in CHOWN MV ; do
  eval "oldcmd=\$$cmd"
  if [ "$oldcmd" != "look_for_it" ] ; then continue ; fi
  if [ "$cmd" = "CHOWN" ] ; then cmdlc="chown" ; fi
  if [ "$cmd" = "MV" ] ; then cmdlc="mv" ; fi
  newcmd=$cmdlc
  for dir in /bin /usr/bin /usr/sbin /usr/etc ; do
    if [ -f $dir/$cmdlc ] ; then
      newcmd=$dir/$cmdlc
      break
    fi
  done
  eval $cmd=$newcmd
done

# See if the exim monitor has been built

if [ -f eximon -a -f eximon.bin ]; then
  exim_monitor="eximon eximon.bin"
fi

# If bin directory doesn't exist, try to create it

if [ ! -d "${BIN_DIRECTORY}" ]; then
  echo mkdir -p ${BIN_DIRECTORY}
  ${real} mkdir -p ${BIN_DIRECTORY}
  if [ $? -ne 0 ]; then
    echo $com ""
    echo $com "*** Exim installation ${ver}failed ***"
    exit 1
  else
    ${real} echo $com ${BIN_DIRECTORY} created
  fi
fi

# If no arguments, install everything

if [ $# -gt 0 ]; then
  set $@
else
  set exim${EXE} ${exim_monitor} exim_dumpdb${EXE} exim_fixdb${EXE} \
      exim_tidydb${EXE} exinext exiwhat exim_dbmbuild${EXE} exicyclog \
      exigrep eximstats exipick exiqgrep exiqsumm exim_lock${EXE} \
      exim_checkaccess exim_msgdate exim_id_update
fi

echo $com ""
echo $com Installation directory is ${BIN_DIRECTORY}
echo $com ""

while [ $# -gt 0 ]; do
  name=$1
  shift

  if [ ! -s ${name} ]; then
    echo $com ""
    echo $com "*** `pwd`/${name} does not exist or is empty"
    echo $com "*** Have you built Exim successfully?"
    echo $com "*** Exim installation ${ver}failed ***"
    exit 1
  fi

  # The exim binary is handled specially

  if [ $name = exim${EXE} ]; then
    exim="./exim -bV -C /dev/null"
    version=exim-`$exim 2>/dev/null | \
      awk '/Exim version/ { OFS=""; print $3,"-",substr($4,2,length($4)-1) }'`${EXE}

    if [ "${version}" = "exim-${EXE}" ]; then
      echo $com ""
      echo $com "*** Could not run $exim to find version number ***"
      echo $com "*** Exim installation ${ver}failed ***"
      $exim
      exit 1
    fi

    # Do something only if newer than existing file, or no existing file

    if ../scripts/newer ${name} ${BIN_DIRECTORY}/${version}; then
      echo ${CP} ${name} ${BIN_DIRECTORY}/${version}
      ${real} ${CP} ${name} ${BIN_DIRECTORY}/${version}
      if [ $? -ne 0 ]; then
        echo $com ""
        echo $com "*** Exim installation ${ver}failed ***"
        exit 1
      fi

      # After copy, set ownership and permissions, unless disabled

      if [ "$do_chown" != "no" ]; then
        echo ${CHOWN} ${INST_UID} ${BIN_DIRECTORY}/${version}
        ${real} ${CHOWN} ${INST_UID} ${BIN_DIRECTORY}/${version}
        if [ $? -ne 0 ]; then
          echo $com ""
          echo $com "*** You must be ${INST_UID} to install exim ***"
          exit 1
        fi
        echo ${CHMOD} a+x ${BIN_DIRECTORY}/${version}
        ${real} ${CHMOD} a+x ${BIN_DIRECTORY}/${version}
        if [ $? -ne 0 ]; then
          echo $com ""
          echo $com "*** Exim installation ${ver}failed ***"
          exit 1
        fi
        echo ${CHMOD} u+s ${BIN_DIRECTORY}/${version}
        ${real} ${CHMOD} u+s ${BIN_DIRECTORY}/${version}
        if [ $? -ne 0 ]; then
          echo $com ""
          echo $com "*** Exim installation ${ver}failed ***"
          exit 1
        fi
      else
        echo $com "$CHOWN $INST_UID omitted: -no_chown was specified"
        echo $com "$CHMOD u+s omitted: -no_chown was specified"
      fi

      # Now sort out the "exim" alias, unless NO_SYMLINK is set.

      if [ "X$NO_SYMLINK" = "X" ] && [ "$do_symlink" != "no" ] ; then

        #  First check whether "exim" exists in the directory.
        if [ -f ${BIN_DIRECTORY}/exim ]; then

          # If it's not a symbolic link, make a copy with the old version number
          if [ `ls -l ${BIN_DIRECTORY}/exim | cut -c1-1` != 'l' ]; then
            oldversion=exim-`${BIN_DIRECTORY}/exim -bV -C /dev/null | \
              awk '/Exim version/ { OFS=""; print $3,"-",substr($4,2,length($4)-1) }'`${EXE}
            if [ "${version}" = "${oldversion}" ] ; then
              echo $com ""
              echo $com "*** Existing file called exim has the same version and compile number ***"
              echo $com "*** Exim installation ${ver}failed ***"
              exit 1
            fi
            echo ${CP} ${BIN_DIRECTORY}/exim ${BIN_DIRECTORY}/${oldversion}
            ${real} ${CP} ${BIN_DIRECTORY}/exim ${BIN_DIRECTORY}/${oldversion}
            if [ $? -ne 0 ]; then
              echo $com ""
              echo $com "*** Exim installation ${ver}failed ***"
              exit 1
            fi
          fi

          # Now we can move the name "exim" to be a symbolic link to the new
          # version, atomically.

          echo \(cd ${BIN_DIRECTORY}\; ${LN} -s ${version} temporary_exim\)
          (${real} cd ${BIN_DIRECTORY}; ${real} ${LN} -s ${version} temporary_exim)
          if [ $? -ne 0 ]; then
            echo $com ""
            echo $com "*** Exim installation ${ver}failed ***"
            exit 1
          fi

          echo ${MV} -f ${BIN_DIRECTORY}/temporary_exim ${BIN_DIRECTORY}/exim
          ${real} ${MV} -f ${BIN_DIRECTORY}/temporary_exim ${BIN_DIRECTORY}/exim
          if [ $? -ne 0 ]; then
            echo $com ""
            echo $com "*** Exim installation ${ver}failed ***"
            exit 1
          fi

        # If "exim" does not already exist just create a symbolic link.

        else
          echo \(cd ${BIN_DIRECTORY}\; ${LN} -s ${version} exim\)
          (${real} cd ${BIN_DIRECTORY}; ${real} ${LN} -s ${version} exim)
          if [ $? -ne 0 ]; then
            echo $com ""
            echo $com "*** Exim installation ${ver}failed ***"
            exit 1
          fi
        fi

      else
        echo $com "creation of symlink omitted"
        if [ "X$NO_SYMLINK" != "X" ] ; then
          echo $com "(NO_SYMLINK is specified in Local/Makefile)"
        else
          echo $com "(-no_symlink was specified)"
        fi
      fi

    # New binary is not newer than the installed file

    else
      echo $com ${name} is not newer than ${BIN_DIRECTORY}/${version}
    fi

  # Handle everything other than the exim binary itself

  else
    if ../scripts/newer ${name} ${BIN_DIRECTORY}/${name}; then
      if [ -f ${BIN_DIRECTORY}/${name} ]; then
        echo ${CP} ${BIN_DIRECTORY}/${name} ${BIN_DIRECTORY}/${name}.O
        ${real} ${CP} ${BIN_DIRECTORY}/${name} ${BIN_DIRECTORY}/${name}.O
        if [ $? -ne 0 ]; then
          echo $com ""
          echo $com "*** Exim installation ${ver}failed ***"
          exit 1
        fi
      fi
      echo ${CP} ${name} ${BIN_DIRECTORY}
      ${real} ${CP} ${name} ${BIN_DIRECTORY}
      if [ $? -ne 0 ]; then
        echo $com ""
        echo $com "*** Exim installation ${ver}failed ***"
        exit 1
      fi
    else
      echo $com ${name} is not newer than ${BIN_DIRECTORY}/${name}
    fi
  fi

done



# If there is no configuration file, install the default, modifying it to refer
# to the configured system aliases file. If there is no setting for
# SYSTEM_ALIASES_FILE, use the traditional /etc/aliases. If the file does not
# exist, install a default (dummy) for that too.

# However, if CONFIGURE_FILE specifies a list of files, skip this code.

echo $com ""

if [ `expr -- "${CONFIGURE_FILE}" : ".*:"` -ne 0 ] ; then
  echo $com Runtime configuration is specified as the following list:
  echo $com ' ' ${CONFIGURE_FILE}
  echo $com Therefore, skipping automatic installation.

elif [ ! -f ${CONFIGURE_FILE} ]; then
  echo $com Installing default configuration in ${CONFIGURE_FILE}
  echo $com because there is no existing configuration file.
  if [ "${SYSTEM_ALIASES_FILE}" = "" ] ; then
    SYSTEM_ALIASES_FILE=/etc/aliases
    echo $com This configuration has system aliases in ${SYSTEM_ALIASES_FILE}.
  fi

  echo ${MKDIR} -p `${DIRNAME} ${CONFIGURE_FILE}`
  ${real} ${MKDIR} -p `${DIRNAME} ${CONFIGURE_FILE}`

  echo sed -e '\\'
  echo "  \"/SYSTEM_ALIASES_FILE/ s'SYSTEM_ALIASES_FILE'${ACTUAL_SYSTEM_ALIASES_FILE}'\"" '\\'
  echo "  ../src/configure.default > \${CONFIGURE_FILE}"

  # I can't find a way of writing this using the ${real} feature because
  # it seems that the output redirection always happens, even when -n was
  # specified. So control it the hard way.

  if [ "$real" = "" ] ; then
    sed -e \
      "/SYSTEM_ALIASES_FILE/ s'SYSTEM_ALIASES_FILE'${ACTUAL_SYSTEM_ALIASES_FILE}'" \
      ../src/configure.default > ${CONFIGURE_FILE}
  else
    true
  fi

  if [ $? -ne 0 ]; then
    echo $com ""
    echo $com "*** Exim installation ${ver}failed ***"
    exit 1
  fi
  if [ ! -f ${SYSTEM_ALIASES_FILE} ]; then
    echo $com '****'
    echo $com Installing a dummy ${SYSTEM_ALIASES_FILE} file because you do not have
    echo $com one, and the default configuration requires it. You should
    echo $com edit ${SYSTEM_ALIASES_FILE} and at least create an alias for postmaster.
    echo $com '***'
    echo ${CP} ../src/aliases.default ${SYSTEM_ALIASES_FILE}
    ${real} ${CP} ../src/aliases.default ${SYSTEM_ALIASES_FILE}
  fi

else
  echo $com Configuration file ${CONFIGURE_FILE} already exists
fi

# Install info files if the directory is defined and the Texinfo
# source documentation is present.

if [ "${INFO_DIRECTORY}" != "" -a -f ../doc/spec.texinfo ] ; then
  echo $com ""
  if [ ! -d "${INFO_DIRECTORY}" ] ; then
    echo mkdir -p ${INFO_DIRECTORY}
    ${real} mkdir -p ${INFO_DIRECTORY}
    if [ $? -ne 0 ]; then
      echo $com ""
      echo $com "*** Exim installation ${ver}failed ***"
      exit 1
    else
      echo $com ${INFO_DIRECTORY} created
    fi
  fi

  echo $com Info installation directory is ${INFO_DIRECTORY}
  echo $com ""

  ${real} makeinfo --no-split --output exim.info ../doc/spec.texinfo
  echo ${CP} exim.info ${INFO_DIRECTORY}
  ${real} ${CP} exim.info ${INFO_DIRECTORY}
  ${real} install-info --section="Exim" \
      --entry "* User guide: (exim).           Exim manual" \
      ${INFO_DIRECTORY}/exim.info ${INFO_DIRECTORY}/dir
  ${real} makeinfo --no-split --output exim_filter.info ../doc/filter.texinfo
  echo ${CP} exim_filter.info ${INFO_DIRECTORY}
  ${real} ${CP} exim_filter.info ${INFO_DIRECTORY}
  ${real} install-info --section="Exim" \
      --entry "* Filtering: (exim_filter).     Filtering mail with Exim" \
      ${INFO_DIRECTORY}/exim_filter.info ${INFO_DIRECTORY}/dir
fi

# Everything OK

echo $com ""
echo $com Exim installation ${ver}complete

# End of exim_install
