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-rwxr-xr-xcontrib/wget-xdelta.sh47
1 files changed, 47 insertions, 0 deletions
diff --git a/contrib/wget-xdelta.sh b/contrib/wget-xdelta.sh
new file mode 100755
index 00000000..d99dd3cc
--- /dev/null
+++ b/contrib/wget-xdelta.sh
@@ -0,0 +1,47 @@
+#!/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