rebase -i: do not "echo" random user-supplied strings

In some places we "echo" a string that comes from a commit log
message, which may have a backslash sequence that is interpreted by
the command (POSIX.1 allows this), most notably "dash"'s built-in
'echo'.

A commit message which contains the string '\n' (or ends with the
string '\c') may result in a garbage line in the todo list of an
interactive rebase which causes the rebase to fail.

To reproduce the behavior (with dash as /bin/sh):

  mkdir test && cd test && git init
  echo 1 >foo && git add foo
  git commit -m"this commit message ends with '\n'"
  echo 2 >foo && git commit -a --fixup HEAD
  git rebase -i --autosquash --root

Now the editor opens with garbage in line 3 which has to be
removed or the rebase fails.

Signed-off-by: Uwe Storbeck <uwe@ibr.ch>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-rebase--interactive.sh

@@ -739,7 +739,7 @@ rearrange_squash () {
 					;;
 				esac
 			done
-			echo "$sha1 $action $prefix $rest"
+			printf '%s %s %s %s\n' "$sha1" "$action" "$prefix" "$rest"
 			# if it's a single word, try to resolve to a full sha1 and
 			# emit a second copy. This allows us to match on both message
 			# and on sha1 prefix