rebase -m: Fix incorrect short-logs of already applied commits.

When a topic branch is rebased, some of whose commits are already
cherry-picked upstream:

    o--X--A--B--Y    <- master
     \
      A--B--Z        <- topic

then 'git rebase -m master' would report:

    Already applied: 0001 Y
    Already applied: 0002 Y

With this fix it reports the expected:

    Already applied: 0001 A
    Already applied: 0002 B

As an added bonus, this change also avoids 'echo' of a commit message,
which might contain escapements.

Signed-off-by: Johannes Sixt <johannes.sixt@telecom.at>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-rebase.sh

@@ -59,20 +59,23 @@ continue_merge () {
 		die "$RESOLVEMSG"
 	fi
 
+	cmt=`cat $dotest/current`
 	if ! git diff-index --quiet HEAD
 	then
-		if ! git-commit -C "`cat $dotest/current`"
+		if ! git-commit -C "$cmt"
 		then
 			echo "Commit failed, please do not call \"git commit\""
 			echo "directly, but instead do one of the following: "
 			die "$RESOLVEMSG"
 		fi
-		printf "Committed: %0${prec}d" $msgnum
+		printf "Committed: %0${prec}d " $msgnum
+		git rev-list --pretty=oneline -1 HEAD | \
+			sed 's/^[a-f0-9]\+ //'
 	else
-		printf "Already applied: %0${prec}d" $msgnum
+		printf "Already applied: %0${prec}d " $msgnum
+		git rev-list --pretty=oneline -1 "$cmt" | \
+			sed 's/^[a-f0-9]\+ //'
 	fi
-	echo ' '`git rev-list --pretty=oneline -1 HEAD | \
-				sed 's/^[a-f0-9]\+ //'`
 
 	prev_head=`git rev-parse HEAD^0`
 	# save the resulting commit so we can read-tree on it later

t/t3406-rebase-message.sh

@@ -0,0 +1,44 @@
+#!/bin/sh
+
+test_description='messages from rebase operation'
+
+. ./test-lib.sh
+
+quick_one () {
+	echo "$1" >"file$1" &&
+	git add "file$1" &&
+	test_tick &&
+	git commit -m "$1"
+}
+
+test_expect_success setup '
+	quick_one O &&
+	git branch topic &&
+	quick_one X &&
+	quick_one A &&
+	quick_one B &&
+	quick_one Y &&
+
+	git checkout topic &&
+	quick_one A &&
+	quick_one B &&
+	quick_one Z
+
+'
+
+cat >expect <<\EOF
+Already applied: 0001 A
+Already applied: 0002 B
+Committed: 0003 Z
+EOF
+
+test_expect_success 'rebase -m' '
+
+	git rebase -m master >report &&
+	sed -n -e "/^Already applied: /p" \
+		-e "/^Committed: /p" report >actual &&
+	diff -u expect actual
+
+'
+
+test_done