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#!/bin/bash
o=$(basename $1)
u=$2
CARCH="i686" # Hmmm where to get this from? /etc/makepkg.conf?
cached_file=""
# Only check for pkg.tar.gz files in the cache, we download db.tar.gz as well
if [[ "$o" =~ "pkg.tar.gz" ]] # if $o contains pkg.tar.gz
then
pkgname=${o%-*-[0-9]-${CARCH}.pkg.tar.gz.part} # Parse out the package name
newend=${o##$pkgname-} # Parse out everything following pkgname
new_version=${newend%-${CARCH}.pkg.tar.gz.part} # Strip off .pkg.tar.gz.part leaving version
url=${u%/*}
for cached_file in $(ls -r /var/cache/pacman/pkg/${pkgname}-*-${CARCH}.pkg.tar.gz 2>/dev/null); do
# just take the first one, by name. I suppose we could take the latest by date...
oldend=${cached_file##*/$pkgname-}
old_version=${oldend%-${CARCH}.pkg.tar.gz}
if [ "$old_version" = "$new_version" ]; then
# We already have the new version in the cache! Just continue the download.
cached_file=""
fi
break
done
fi
if [ "$cached_file" != "" ]; then
# Great, we have a cached file, now calculate a patch name from it
delta_name=$pkgname-${old_version}_to_${new_version}-${CARCH}.delta
# try to download the delta
if wget --passive-ftp -c $url/$delta_name; then
# Now apply the delta to the cached file to produce the new file
echo Applying delta...
if xdelta patch $delta_name $cached_file $o; then
# Remove the delta now that we are finished with it
rm $delta_name
else
# Hmmm. xdelta failed for some reason
rm $delta_name
# just download the file
wget --passive-ftp -c -O $o $u
fi
else
# just download the file
wget --passive-ftp -c -O $o $u
fi
else
# just download the file
wget --passive-ftp -c -O $o $u
fi
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