contrib/wget-xdelta.sh

   1 #!/bin/bash
   2
   3 if [ -r "/etc/makepkg.conf" ]; then
   4         source /etc/makepkg.conf
   5 else
   6         echo "wget-xdelta: Unable to find makepkg.conf"
   7         exit 1
   8 fi
   9
  10 if [ -r ~/.makepkg.conf ]; then
  11         source ~/.makepkg.conf
  12 fi
  13
  14 out_file=$(basename $1)
  15 file_url=$2
  16
  17 if ! [[ "$out_file" =~ "pkg.tar.gz" ]]; then
  18         # If it's not a package file download as normal and exit.
  19         #wget --passive-ftp -c -O "$out_file" "$file_url"
  20         exit $?
  21 fi
  22
  23
  24 # Get the package name and version
  25 [[ "$out_file" =~ "$CARCH" ]] && arch="-$CARCH" || arch=""
  26 pkg_data=$(echo $out_file | \
  27         sed "s|^\(.*\)-\([[:alnum:]_\.]*-[[:alnum:]_\.]*\)${arch}${PKGEXT}.part|\1 \2|")
  28 pkgname=$(echo $pkg_data | cut -d ' ' -f 1)
  29 new_version=$(echo $pkg_data | cut -d ' ' -f 2)
  30 base_url=${file_url%/*}
  31
  32 # Look for the last version
  33 for file in $(ls -r /var/cache/pacman/pkg/${pkgname}-*-*{,-$CARCH}$PKGEXT 2>/dev/null); do
  34         [[ "$file" =~ "$CARCH" ]] && arch="-$CARCH" || arch=""
  35         check_version=$(echo $file | \
  36                 sed "s|^.*/${pkgname}-\([[:alnum:]_\.]*-[[:alnum:]_\.]*\)${arch}$PKGEXT$|\1|" | \
  37                 grep -v "^/var/cache/pacman/pkg")
  38
  39         [ "$check_version" = "" ] && continue
  40
  41         vercmp=$(vercmp "$check_version" "$old_version")
  42         if [ "$check_version" != "$new_version" -a $vercmp -gt 0 ]; then
  43                 old_version=$check_version
  44                 old_file=$file
  45         fi
  46 done
  47
  48 if [ "$old_version" != "" -a "$old_version" != "$new_version" ]; then
  49         # Great, we have a cached file, now calculate a patch name from it
  50         delta_name="$pkgname-${old_version}_to_${new_version}-${CARCH}.delta"
  51
  52         echo "wget-xdelta: Attempting to download delta $delta_name..." >&2
  53         if wget --passive-ftp -c "$base_url/$delta_name"; then
  54                 echo "wget-xdelta: Applying delta..."
  55                 if xdelta patch "$delta_name" "$old_file" "$out_file"; then
  56                         echo "wget-xdelta: Delta applied successfully!"
  57                         rm "$delta_name"
  58                         exit 0
  59                 else
  60                         echo "wget-xdelta: Failed to apply delta!"
  61                         rm $delta_name
  62                 fi
  63         fi
  64  fi
  65
  66 echo "wget-xdelta: Downloading new package..."
  67 wget --passive-ftp -c -O "$out_file" "$file_url"
  68 exit $?
  69
  70 # vim:set ts=4 sw=4 noet: