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diff --git a/t/t9151/make-svnmerge-dump b/t/t9151/make-svnmerge-dump
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+#!/bin/sh
+#
+# this script sets up a Subversion repository for Makefile in the
+# first ever git merge, as if it were done with svnmerge (SVN 1.5+)
+#
+
+rm -rf foo.svn foo
+set -e
+
+mkdir foo.svn
+svnadmin create foo.svn
+svn co file://`pwd`/foo.svn foo
+
+commit() {
+    i=$(( $1 + 1 ))
+    shift;
+    svn commit -m "(r$i) $*" >/dev/null || exit 1
+    echo $i
+}
+
+say() {
+    echo "[1m * $*[0m"
+}
+
+i=0
+cd foo
+mkdir trunk
+mkdir branches
+svn add trunk branches
+i=$(commit $i "Setup trunk and branches")
+
+git cat-file blob 6683463e:Makefile > trunk/Makefile
+svn add trunk/Makefile 
+
+say "Committing ANCESTOR"
+i=$(commit $i "ancestor")
+svn cp trunk branches/left
+
+say "Committing BRANCH POINT"
+i=$(commit $i "make left branch")
+svn cp trunk branches/right
+
+say "Committing other BRANCH POINT"
+i=$(commit $i "make right branch")
+
+say "Committing LEFT UPDATE"
+git cat-file blob 5873b67e:Makefile > branches/left/Makefile
+i=$(commit $i "left update 1")
+
+git cat-file blob 75118b13:Makefile > branches/right/Makefile
+say "Committing RIGHT UPDATE"
+pre_right_update_1=$i
+i=$(commit $i "right update 1")
+
+say "Making more commits on LEFT"
+git cat-file blob ff5ebe39:Makefile > branches/left/Makefile
+i=$(commit $i "left update 2")
+git cat-file blob b5039db6:Makefile > branches/left/Makefile
+i=$(commit $i "left update 3")
+
+say "Making a LEFT SUB-BRANCH"
+svn cp branches/left branches/left-sub
+sub_left_make=$i
+i=$(commit $i "make left sub-branch")
+
+say "Making a commit on LEFT SUB-BRANCH"
+echo "crunch" > branches/left-sub/README
+svn add branches/left-sub/README
+i=$(commit $i "left sub-branch update 1")
+
+say "Merging LEFT to TRUNK"
+svn update
+cd trunk
+svn merge ../branches/left --accept postpone
+git cat-file blob b5039db6:Makefile > Makefile
+svn resolved Makefile
+i=$(commit $i "Merge left to trunk 1")
+cd ..
+
+say "Making more commits on LEFT and RIGHT"
+echo "touche" > branches/left/zlonk
+svn add branches/left/zlonk
+i=$(commit $i "left update 4")
+echo "thwacke" > branches/right/bang
+svn add branches/right/bang
+i=$(commit $i "right update 2")
+
+say "Squash merge of RIGHT tip 2 commits onto TRUNK"
+svn update
+cd trunk
+svn merge -r$pre_right_update_1:$i ../branches/right
+i=$(commit $i "Cherry-pick right 2 commits to trunk")
+cd ..
+
+say "Merging RIGHT to TRUNK"
+svn update
+cd trunk
+svn merge ../branches/right --accept postpone
+git cat-file blob b51ad431:Makefile > Makefile
+svn resolved Makefile
+i=$(commit $i "Merge right to trunk 1")
+cd ..
+
+say "Making more commits on RIGHT and TRUNK"
+echo "whamm" > branches/right/urkkk
+svn add branches/right/urkkk
+i=$(commit $i "right update 3")
+echo "pow" > trunk/vronk
+svn add trunk/vronk
+i=$(commit $i "trunk update 1")
+
+say "Merging RIGHT to LEFT SUB-BRANCH"
+svn update
+cd branches/left-sub
+svn merge ../right --accept postpone
+git cat-file blob b51ad431:Makefile > Makefile
+svn resolved Makefile
+i=$(commit $i "Merge right to left sub-branch")
+cd ../..
+
+say "Making more commits on LEFT SUB-BRANCH and LEFT"
+echo "zowie" > branches/left-sub/wham_eth
+svn add branches/left-sub/wham_eth
+pre_sub_left_update_2=$i
+i=$(commit $i "left sub-branch update 2")
+sub_left_update_2=$i
+echo "eee_yow" > branches/left/glurpp
+svn add branches/left/glurpp
+i=$(commit $i "left update 5")
+
+say "Cherry pick LEFT SUB-BRANCH commit to LEFT"
+svn update
+cd branches/left
+svn merge -r$pre_sub_left_update_2:$sub_left_update_2 ../left-sub
+i=$(commit $i "Cherry-pick left sub-branch commit to left")
+cd ../..
+
+say "Merging LEFT SUB-BRANCH back to LEFT"
+svn update
+cd branches/left
+# it's only a merge because the previous merge cherry-picked the top commit
+svn merge -r$sub_left_make:$sub_left_update_2 ../left-sub --accept postpone
+i=$(commit $i "Merge left sub-branch to left")
+cd ../..
+
+say "Merging EVERYTHING to TRUNK"
+svn update
+cd trunk
+svn merge ../branches/left --accept postpone
+svn resolved bang
+i=$(commit $i "Merge left to trunk 2")
+# this merge, svn happily updates the mergeinfo, but there is actually
+# nothing to merge.  git-svn will not make a meaningless merge commit.
+svn merge ../branches/right --accept postpone
+i=$(commit $i "non-merge right to trunk 2")
+cd ..
+
+cd ..
+svnadmin dump foo.svn > svn-mergeinfo.dump
+
+rm -rf foo foo.svn