use git-svn to generate patch files for a whole branch excluding the files changed only as part of a merge from a parent branch

generate_patch.sh

#!/bin/bash

BRANCH_NAME=$1
shift

for project in $@;do
   pushd $project >& /dev/null
   MAX="";
   MIN="";
   CURR_FILE="";
   #grab all files (full SVN path) and revisions from the branch that were not part of a commit
   for FULL_FILE in $(for i in $(git log --grep="branches/$BRANCH_NAME" --no-merges --format=oneline | awk '{print $1}');do SVN_LINE=$(git show --name-only $i | grep "git-svn" | awk '{print $2}'); REVISION=$(echo $SVN_LINE | awk -F@ '{print $2}');SVN_URL=$(echo $SVN_LINE | awk -F@ '{print $1}'); for FILE in $(git show --name-only $i | grep "^[a-z]" | grep -v "commit" );do echo "$SVN_URL/$FILE@$REVISION";done ;done | sort -n);do
      NEW_FILE=$(echo $FULL_FILE | awk -F@ '{print $1}'); 
      NEW_REV=$(echo $FULL_FILE | awk -F@ '{print $2}'); 
      #if we've hit a new file, then update FULL_PATH and generate a diff with the MIN and MAX revisions
      if [[ "$CURR_FILE" != "$NEW_FILE" ]];then 
         FULL_PATH=$(dirname $CURR_FILE | sed 's;svn://mayfield/source/;;g'); 
         svn diff $CURR_FILE@HEAD -r $MIN:$MAX | sed "s;Index: ;Index: $FULL_PATH/;g" | sed "s;--- ;--- $FULL_PATH/;g" | sed "s;+++ ;+++ $FULL_PATH/;g" ; 
         #don't forget to subtract one from the revision
         #this ensures that a new file will be seen as an addition
         MIN=$(($NEW_REV - 1));
         MAX="$MIN";
         CURR_FILE="$NEW_FILE"; 
      else 
         MAX="$NEW_REV"; 
      fi;
   done
   popd >& /dev/null
done