build: correct sed transformation to work also on .git-module-status

My patch was wrong.
I kept the sed transformation the same in the two places,
but it wasn't strict enough to also work on the file contents.
Sorry about that.  This fixes it.

>From 93927cc7b9f63c414e5bfeb7eba393fde3295601 Mon Sep 17 00:00:00 2001
From: Jim Meyering <meyering@redhat.com>
Date: Fri, 20 Nov 2009 16:23:17 +0100
Subject: [PATCH libguestfs] build: correct sed transformation to work also on .git-module-status

* autogen.sh: Use a more strict sed transformation so it works also
on the contents of .git-module-status, which has no prefix.
* cfg.mk (_submodule_hash): Use a stricter sed regexp.

2 files changed, 4 insertions, 2 deletions

diff --git a/autogen.sh b/autogen.sh
index cbb6da89..166ca56e 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -24,7 +24,7 @@ set -v
 # Ensure that whenever we pull in a gnulib update or otherwise change to a
 # different version (i.e., when switching branches), we also rerun ./bootstrap.
 curr_status=.git-module-status
-t=$(git submodule status|sed 's/.//;s/ .*//')
+t=$(git submodule status|sed 's/^[ -]//;s/ .*//')
 if test "$t" = "$(cat $curr_status 2>/dev/null)"; then
     : # good, it's up to date
 else
diff --git a/cfg.mk b/cfg.mk
index 0c19cc9f..8811d0d0 100644
--- a/cfg.mk
+++ b/cfg.mk
@@ -132,7 +132,9 @@ ifeq (0,$(MAKELEVEL))
   # submodule name.  Contrast these:
   # -b653eda3ac4864de205419d9f41eec267cb89eeb .gnulib
   #  b653eda3ac4864de205419d9f41eec267cb89eeb .gnulib (v0.0-2286-gb653eda)
-  _submodule_hash = sed 's/.//;s/ .*//'
+  # $ cat .git-module-status
+  # b653eda3ac4864de205419d9f41eec267cb89eeb
+  _submodule_hash = sed 's/^[ -]//;s/ .*//'
   _update_required := $(shell						\
       actual=$$(git submodule status | $(_submodule_hash));		\
       stamp="$$($(_submodule_hash) $(_curr_status) 2>/dev/null)";	\