misc/zipdiff

   1 #!/bin/sh
   2
   3 usage()
   4 {
   5         cat <<EOF
   6 Usage:
   7   $0 -o difference.zip -f from.zip -t to.zip
   8   $0 -f from.zip -t to.zip
   9 EOF
  10         exit 1
  11 }
  12
  13 output=
  14 from=
  15 to=
  16
  17 while [ $# -gt 0 ]; do
  18         o=$1
  19         shift
  20         case "$o" in
  21                 -o)
  22                         output=$1
  23                         shift
  24                         ;;
  25                 -f)
  26                         from=$1
  27                         shift
  28                         ;;
  29                 -t)
  30                         to=$1
  31                         shift
  32                         ;;
  33                 *)
  34                         usage
  35                         ;;
  36         esac
  37 done
  38
  39 [ -n "$from" ] || usage
  40 [ -n "$to" ] || usage
  41
  42 found()
  43 {
  44         type=$1
  45         source=$2
  46         echo >&2 "$type: $source"
  47         case "$type" in
  48                 new|changed|deleted)
  49                         echo "$source"
  50                         ;;
  51                 deleted|*)
  52                         echo >&2 " * Sorry, can't handle deletion of $source."
  53                         ;;
  54         esac
  55 }
  56
  57 tempdir=`mktemp -d -t zipdiff.XXXXXX`
  58
  59 newline="
  60 "
  61 fromlist="$(zipinfo -1 "$from" | grep -v /\$)"
  62 tolist="$(zipinfo -1 "$to" | grep -v /\$)"
  63
  64 diffit()
  65 {
  66         echo "$fromlist" | while IFS= read -r line; do
  67                 case "$newline$tolist$newline" in
  68                         *$newline$line$newline*)
  69                                 ;;
  70                         *)
  71                                 found deleted "$line"
  72                                 ;;
  73                 esac
  74         done
  75         echo "$tolist" | while IFS= read -r line; do
  76                 case "$newline$fromlist$newline" in
  77                         *$newline$line$newline*)
  78                                 # check if equal
  79                                 unzip -p "$from" "$line" > "$tempdir/v1"
  80                                 unzip -p "$to" "$line" > "$tempdir/v2"
  81                                 if ! diff --brief "$tempdir/v1" "$tempdir/v2" >/dev/null 2>&1; then
  82                                         found changed "$line"
  83                                 fi
  84                                 rm "$tempdir/v1"
  85                                 rm "$tempdir/v2"
  86                                 ;;
  87                         *)
  88                                 found new "$line"
  89                                 ;;
  90                 esac
  91         done
  92 }
  93
  94 result=`diffit`
  95
  96 case "$output" in
  97         '')
  98                 ;;
  99         *)
 100                 rm -f "$output"
 101                 echo "$result" | while IFS= read -r line; do
 102                         echo >&2 "extracting $line..."
 103                         dline=./$line
 104                         mkdir -p "$tempdir/${dline%/*}"
 105                         unzip -p "$to" "$line" > "$tempdir/$line" # this may create an empty file - don't care, DP handles this as deletion
 106                 done
 107                 case "$output" in
 108                         /*)
 109                                 ;;
 110                         *)
 111                                 output=`pwd`/$output
 112                                 ;;
 113                 esac
 114                 cd "$tempdir"
 115                 #zip -9r "$output" .
 116                 7za a -tzip -mx=9 "$output" .
 117                 cd ..
 118                 ;;
 119 esac
 120
 121 rm -rf "$tempdir"