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 if [ $# -lt 1 ]
  11 then
  12         echo "usage: ${0##*/} <filename> [<filename> ..]"
  13         exit 1
  14 fi
  15
  16 TMP="/tmp/${0##*/}.tmp"
  17 while [ -n "$1" ]
  18 do
  19         test ! -s "$1" && \
  20                 continue
  21
  22         X_ORIGINAL_DATE=$(grep -Eim 1 '^X-Original-Date: ' "$1" | cut -d ':' -f 2)
  23         DATE=$(grep -Eim 1 '^Date: ' "$1" | cut -d ':' -f 2)
  24         RECEIVED_DATE=$(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]+' "$1" | cut -d ';' -f 2)
  25 # strict, day of week needed
  26 #       RECEIVED_DATE=$(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]+' "$1" | cut -d ';' -f 2)
  27         FILE_DATE=$(ls -l --time-style="+%a, %d %b %Y %X %z" "$1" | tr -s ' ' ' ' | cut -d ' ' -f 6-11)
  28         # we could also use the system date as a possible replacement
  29         #SYSTEM_DATE="$(date -R)"
  30
  31         # determine which replacement date to use
  32         if [ -z "$RECEIVED_DATE" ]
  33         then
  34                 # don't forget to add the leading whitespace
  35                 REPLACEMENT_DATE=" $FILE_DATE"
  36         else
  37                 REPLACEMENT_DATE="$RECEIVED_DATE"
  38         fi
  39
  40         # ensure that a X-Original-Date is set
  41         if [ -z "$X_ORIGINAL_DATE" ]
  42         then
  43                 test -z "$DATE" && \
  44                         echo "X-Original-Date:$REPLACEMENT_DATE" > "$TMP" || \
  45                         echo "X-Original-Date:$DATE" > "$TMP"
  46         else
  47                 :> "$TMP"
  48         fi
  49
  50         # replace/set the date and write all lines
  51         if [ -z "$DATE" ]
  52         then
  53                 echo "Date:$REPLACEMENT_DATE" >> "$TMP"
  54                 cat "$1" >> "$TMP"
  55         else
  56                 sed "s/^Date: .*/Date:$REPLACEMENT_DATE/" "$1" >> "$TMP"
  57         fi
  58
  59         # uncomment the following line to backup the original file
  60         #mv -f "$1" "$1.bak"
  61
  62         mv -f "$TMP" "$1"
  63         if [ $? -ne 0 ]
  64         then
  65                 echo "error while moving $TMP to $1"
  66                 exit 1
  67         fi
  68
  69         shift
  70 done
  71 exit 0