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

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