Traslates .eml file to maildir format.

eml2maildir.sh

#!/bin/bash
# Copyright (C) 2015
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# Traslates .eml file to maildir format.
# originally forked from https://gist.github.com/targzeta/7137182 by "Emanuele Tomasi <[email protected]>"
# latest version https://gist.github.com/mailme-gx/cfd187033fbf201018a8 by "GX"

# -h help

# Changelog:
# 2015/07/17
# Removed fromdos command
# Quoted filename to allow for spaces
# Change owner and group of file
# If source is a directory import all files in directory
# If no destination is specified use ./new as destination
# 2015/07/17
# find command use . not * to avoid "Argument list too long"

# TODO/NOTES
# cp command fails if a file ends with a trailing space i.e. cp "this file " "that_file"
# date command shows errors when parsing dates, this is not too much of a concrern as our email app parsers the date from the email header not file timestamp

SCRIPT_NAME=${0##*/}
SCRIPT_AUTHOR="GX"
USER=vmail
GROUP=vmail

#############
# FUNCTIONS #
#############
function _exit
{
  echo -e "${SCRIPT_NAME}: ${1}"
  exit $2
}

function _help
{
  cat <<EOF
Use: ${SCRIPT_NAME} [option]... <source file or directory> [destination directory]

Translates a .eml file to a maildir filename. For setting hostname it uses
HOST environment variable or, if it isn't setted, HOSTNAME.
If no destination directory is specified the default name is new/ directory.

Options:
    -c    Setting the filename for a cur/ directory. You can set your flag by
          setting the FLAG environment variable. Default FLAG is 'S'.
    -d    Dovecot extension. Sets the 'W' option.
    -h    Display this help and exit.

by ${SCRIPT_AUTHOR}"
EOF
}

function _check_extern_programs
{
  local error=0
  local string_error

  if ! which which >&/dev/null
  then
    error=1
    string_error="/usr/bin/which : command not founds.\n";
  else
    for progr in $@
    do

      if ! which $progr >& /dev/null
      then
        error=1
        string_error=${string_error}"${progr} : command not founds.\n"
      fi
    done
  fi

  if (( $error ))
  then
    _exit "You need to install these commands:\n$string_error" 1
  fi
}


function rename_file {
  _TMPFILE=$(mktemp)

  [ -z ${_TMPFILE} ] && exit 1

  cp "$file" $_TMPFILE

  _HOST=${HOST:-$HOSTNAME}
  _RANDOM=$(</dev/urandom tr -cd '[:digit:]' | head -c 6)
  _DATE=$(sed -n '/^Date:/{s/Date: //;p;q}' "$file")
  _TIMESTAMP=$(date --date="$_DATE" '+%s')
  _SIZE=$(stat $_TMPFILE --printf='%s')

  _FILENAME="${_TIMESTAMP}.P${_RANDOM}Q2.${_HOST},S=${_SIZE}"

  if (( $OPT_D == 1 ))
  then
    _WSIZE=$(stat "$file" --printf='%s')
    _FILENAME+=",W=${_WSIZE}"
  fi

  if (( $OPT_C == 1 ))
  then
    _FLAG=${FLAG:-S}
    _FILENAME+=":2,${_FLAG}"
  fi

  _OUTPUT_FILE=${destdir}/${_FILENAME}
  mv $_TMPFILE "$_OUTPUT_FILE"
  touch --date="${_DATE}" "$_OUTPUT_FILE"
  chown $USER:$GROUP "$_OUTPUT_FILE"
}

##########
# CHECKS #
##########
enable getopts echo exit

IFS=$'\n\t '

OPT_C=0
OPT_D=0
while getopts :hcd opzione
do
  case $opzione in
    c) OPT_C=1;;
    d) OPT_D=1;;
    h) _help; exit;;
    ?) _exit "-${OPTARG} : not valid argument." 1;;
  esac
done

while (( $OPTIND != 1 ))
do
  shift
  let --OPTIND
done

[ -z "$1"  ] &&  _exit "missing argument. "\
"${SCRIPT_NAME} -h for help." 1

_check_extern_programs date head mktemp stat touch

########
# MAIN #
########
file_or_dir="$1"
destdir="$2"

[ -z "$destdir"  ] &&  destdir="./new"

if [ ! -d "$destdir" ]
then
    mkdir "$destdir"
    chown $USER:$GROUP "$destdir"
fi

if [ -d "$file_or_dir" ]
then
  find ${file_or_dir}/. -maxdepth 1 -type f | while read file; do
    rename_file
  done
else
  file=$file_or_dir
  rename_file
fi


#EOF

I am not sure how to send a pull request for a gist (is that even possible), but I think the word "setted" should be "set" (English irregular verbs >,< ).

Thanks Imanul, Yes this a Type

Also, what is the purpose of setting the user and group to vmail / vmail ? Is it expected that this user would exist? It doesn't exist on my system. I changed both to $USER .

The vmail user group is used when a setup is done with postfix and dovecot on a debian system. file permissions need to be set to that user.

You are using $USER will set permissions of the user running the script which might not be ideal. But if it works for you fine :)

That makes sense! Sorry for the noise :-)