tools/fix_date.sh

   1 #!/bin/sh
   2
   3 # usage: fix_date.sh <filename> [<filename>..]
   4 # It will replace the Date: value w/ the one picked up from more recent
   5 # Received: field if this field resides in one line. Otherwise, it will
   6 # take the file modification time (using a RFC 2822-compliant form).
   7 # If no X-Original-Date already exist, the former Date value will be set
   8 # in such field.
   9
  10 # TODO: add a switch to replace only non RFC-compliant Date: headers
  11
  12 VERSION="0.0.3"
  13
  14
  15 function version()
  16 {
  17         echo "$VERSION"
  18         exit 0
  19 }
  20
  21 function usage()
  22 {
  23         echo "usage:"
  24         echo "  ${0##*/} [<switches>] <filename> [<filename> ..]"
  25         echo "switches:"
  26         echo "  --help     display this help then exit"
  27         echo "  --version  display version information then exit"
  28         echo "  --force    force writting of Date: header even if it already exists"
  29         echo "  --debug    turn on debug information (be more verbose)"
  30         echo "  --         end of switches (in case a filename starts with a -)"
  31         exit $1
  32 }
  33
  34
  35 # use --force to always write the Date header
  36 # otherwise, the Date header will be written if only it doesn't already
  37 # exist
  38 FORCE=0
  39 # use --debug to display more information about what's performed
  40 DEBUG=0
  41
  42 while [ -n "$1" ]
  43 do
  44         case "$1" in
  45         --help)         usage 0;;
  46         --version)      version;;
  47         --force)        FORCE=1;;
  48         --debug)        DEBUG=1;;
  49         --)                     shift
  50                                 break;;
  51         -*)                     echo "error: unrecognized switch '$1'"
  52                                 usage 1;;
  53         *)                      break;;
  54         esac
  55         shift
  56 done
  57
  58 test $# -lt 1 && \
  59         usage 1
  60
  61 TMP="/tmp/${0##*/}.tmp"
  62
  63 while [ -n "$1" ]
  64 do
  65         # skip if file is empty or doesn't exist
  66         if [ ! -s "$1" ]
  67         then
  68                 shift
  69                 continue
  70         fi
  71
  72         X_ORIGINAL_DATE=$(grep -Eim 1 '^X-Original-Date: ' "$1" | cut -d ':' -f 2)
  73         DATE=$(grep -Eim 1 '^Date: ' "$1" | cut -d ':' -f 2)
  74         RECEIVED_DATE=$(grep -Eim 1 ';( (Mon|Tue|Wed|Thu|Fri|Sat|Sun),)? [0-9]+ (Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dev) [0-9]+ [0-9]+:[0-9]+:[0-9}+ [-+][0-9]+' "$1" | cut -d ';' -f 2)
  75 # strict, day of week needed
  76 #       RECEIVED_DATE=$(grep -Eim 1 '; (Mon|Tue|Wed|Thu|Fri|Sat|Sun), [0-9]+ (Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dev) [0-9]+ [0-9]+:[0-9]+:[0-9}+ [-+][0-9]+' "$1" | cut -d ';' -f 2)
  77         FILE_DATE=$(ls -l --time-style="+%a, %d %b %Y %X %z" "$1" | tr -s ' ' ' ' | cut -d ' ' -f 6-11)
  78         # we could also use the system date as a possible replacement
  79         #SYSTEM_DATE="$(date -R)"
  80
  81         # determine which replacement date to use
  82         if [ -z "$RECEIVED_DATE" ]
  83         then
  84                 # don't forget the leading whitespace here
  85                 REPLACEMENT_DATE=" $FILE_DATE"
  86                 REPLACEMENT="file date"
  87 #               REPLACEMENT_DATE=" $SYSTEM_DATE"
  88 #               REPLACEMENT="system date"
  89         else
  90                 REPLACEMENT_DATE="$RECEIVED_DATE"
  91                 REPLACEMENT="received date"
  92         fi
  93
  94         # ensure that a X-Original-Date is set (but don't override it)
  95         if [ -z "$X_ORIGINAL_DATE" ]
  96         then
  97                 if [ -z "$DATE" ]
  98                 then
  99                         echo "X-Original-Date:$REPLACEMENT_DATE" > "$TMP"
 100                 else
 101                         test $FORCE -eq 1 && \
 102                                 echo "X-Original-Date:$DATE" > "$TMP"
 103                 fi
 104         else
 105                 :> "$TMP"
 106         fi
 107
 108         # replace/set the date and write all lines
 109         if [ -z "$DATE" ]
 110         then
 111                 test $DEBUG -eq 1 && \
 112                         echo "$1: date not found, using $REPLACEMENT now"
 113                 echo "Date:$REPLACEMENT_DATE" >> "$TMP"
 114                 cat "$1" >> "$TMP"
 115         else
 116                 if [ $FORCE -eq 1 ]
 117                 then
 118                         test $DEBUG -eq 1 && \
 119                                 echo "$1: date already found, replacing with $REPLACEMENT"
 120                         sed "s/^Date: .*/Date:$REPLACEMENT_DATE/" "$1" >> "$TMP"
 121                 else
 122                         test $DEBUG -eq 1 && \
 123                                 echo "$1: date already found, skipping"
 124                         cat "$1" >> "$TMP"
 125                 fi
 126         fi
 127
 128         # uncomment the following line to backup the original file
 129         #mv -f "$1" "$1.bak"
 130
 131         mv -f "$TMP" "$1"
 132         if [ $? -ne 0 ]
 133         then
 134                 echo "error while moving '$TMP' to '$1'"
 135                 exit 1
 136         fi
 137
 138         shift
 139 done
 140 exit 0