diff --git a/git-subtree.sh b/git-subtree.sh
index 7ae71886f4..ffffb5ed88 100755
--- a/git-subtree.sh
+++ b/git-subtree.sh
@@ -149,6 +149,7 @@ copy_commit()
 			GIT_COMMITTER_NAME \
 			GIT_COMMITTER_EMAIL \
 			GIT_COMMITTER_DATE
+		(echo -n '*'; cat ) |  # FIXME
 		git commit-tree "$2" $3  # reads the rest of stdin
 	) || die "Can't copy commit $1"
 }
@@ -199,7 +200,7 @@ cmd_split()
 	cache_setup || exit $?
 	
 	if [ -n "$onto" ]; then
-		echo "Reading history for --onto=$onto..."
+		debug "Reading history for --onto=$onto..."
 		git rev-list $onto |
 		while read rev; do
 			# the 'onto' history is already just the subdir, so
@@ -254,7 +255,7 @@ cmd_split()
 		latest_old=$(cache_get latest_old)
 		git merge -s ours \
 			-m "$(merge_msg $dir $latest_old $latest_new)" \
-			$latest_new
+			$latest_new >&2
 	fi
 	echo $latest_new
 	exit 0
diff --git a/test.sh b/test.sh
new file mode 100755
index 0000000000..8a9d92f703
--- /dev/null
+++ b/test.sh
@@ -0,0 +1,96 @@
+#!/bin/bash -x
+. shellopts.sh
+set -e
+
+rm -rf mainline subproj
+mkdir mainline subproj
+
+cd subproj
+git init
+
+touch sub1
+git add sub1
+git commit -m 'sub-1'
+git branch sub1
+git branch -m master subproj
+
+touch sub2
+git add sub2
+git commit -m 'sub-2'
+git branch sub2
+
+touch sub3
+git add sub3
+git commit -m 'sub-3'
+git branch sub3
+
+cd ../mainline
+git init
+touch main1
+git add main1
+git commit -m 'main-1'
+git branch -m master mainline
+
+git fetch ../subproj sub1
+git branch sub1 FETCH_HEAD
+git read-tree --prefix=subdir FETCH_HEAD
+git checkout subdir
+git commit -m 'initial-subdir-merge'
+
+git merge -m 'merge -s -ours' -s ours FETCH_HEAD
+
+touch subdir/main-sub3
+git add subdir/main-sub3
+git commit -m 'main-sub3'
+
+touch main-2
+git add main-2
+git commit -m 'main-2 boring'
+
+touch subdir/main-sub4
+git add subdir/main-sub4
+git commit -m 'main-sub4'
+
+git fetch ../subproj sub2
+git branch sub2 FETCH_HEAD
+git merge -s subtree FETCH_HEAD
+git branch pre-split
+
+split1=$(git subtree split --onto FETCH_HEAD subdir --rejoin)
+echo "split1={$split1}"
+git branch split1 "$split1"
+
+touch subdir/main-sub5
+git add subdir/main-sub5
+git commit -m 'main-sub5'
+
+cd ../subproj
+git fetch ../mainline split1
+git branch split1 FETCH_HEAD
+git merge FETCH_HEAD
+
+touch sub6
+git add sub6
+git commit -m 'sub6'
+
+cd ../mainline
+split2=$(git subtree split subdir --rejoin)
+git branch split2 "$split2"
+
+touch subdir/main-sub7
+git add subdir/main-sub7
+git commit -m 'main-sub7'
+
+split3=$(git subtree split subdir --rejoin)
+git branch split3 "$split3"
+
+cd ../subproj
+git fetch ../mainline split3
+git branch split3 FETCH_HEAD
+git merge FETCH_HEAD
+git branch subproj-merge-split3
+
+cd ../mainline
+git fetch ../subproj subproj-merge-split3
+git branch subproj-merge-split3 FETCH_HEAD
+git merge subproj-merge-split3