diplodocus.org Git - nmh/blob - etc/rmmproc.messageid

   1 #! /bin/sh
   2 ##
   3  # rmmproc.messageid -- tries to back up each message/file to a file
   4  #                      that's named based on Message ID
   5  #
   6  # This code is Copyright (c) 2013, by the authors of nmh.
   7  # See the COPYRIGHT file in the root directory of the nmh
   8  # distribution for complete copyright information.
   9  #
  10  # If called on messages, the current directory is the message folder
  11  # and the script arguments are the message filenames.  If called on
  12  # files, the arguments are the full paths to the files.
  13  #
  14  # The backup directory will be:
  15  #   1) If input is messages, the folder of the messages.
  16  #   2) If input is files, the directories of the files.
  17  #   3) If input is standard input (-), the user's MHPATH directory.
  18  #
  19  # Each backup filename will be:
  20  #   1) Message-ID with all / and \ converted to periods.
  21  #      Message-IDs should not contain \, but some filesystems can't
  22  #      handle them.  Message-IDs should be unique, so there should be
  23  #      no need to backup a file with the same name, especially if the
  24  #      result of malicious action.  If the backup file already
  25  #      exists, use 2).
  26  #      NOTE: conversion of some characters in the filename could
  27  #      result in an unintended name collision.  If that is a concern,
  28  #      a program that uses mkstemp(3) to create a temporary file might
  29  #      be the basis for a remedy.
  30  #   2) Concatenation of BACKUP_PREFIX and input filename.
  31  #      NOTE: if a file of that name already exists in the destination
  32  #      directory, it will be overwritten by the mv below.
  33 ##
  34
  35 for i in "$@"; do
  36     if [ "$i" = - ]; then
  37         #### Input is stdin; put backup in user's MHPATH directory.
  38         dir=`mhparam path`
  39         #### If Path is relative, prepend home directory.
  40         [ `dirname "$dir"` = . ]  &&  dir="$HOME/$dir"
  41     else
  42         dir=`dirname "$i"`
  43     fi
  44
  45     #### Extract first Message-Id, remove <>, substitute / and \.
  46     messageid=`sed -n '
  47         /^$/q; /^[Mm][Ee][Ss][Ss][Aa][Gg][Ee]-[Ii][Dd]:/!d
  48         s/>.*//; s/.*<//; y#/\\\#..#; p
  49         ' "$i"`
  50
  51     if [ "$messageid"  -a  ! -f "$dir/$messageid" ]; then
  52         filename="$dir/$messageid"
  53     else
  54         #### `mhparam sbackup` is usually ',' but depends on configuration.
  55         filename="$dir"/`mhparam sbackup``basename "$i"`
  56     fi
  57
  58     mv "$i" "$filename"  ||  status=1
  59 done
  60
  61 exit $status