[libvirt] [PATCH] do not require two ./autogen.sh runs to permit "make"

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I tracked down the source of the two-autogen.sh-runs-required bug.
Here's the fix:

>From 0583de2de2038d4f8875268391fd4994329d39bf Mon Sep 17 00:00:00 2001
From: Jim Meyering <meyering@xxxxxxxxxx>
Date: Tue, 16 Mar 2010 21:08:31 +0100
Subject: [PATCH] do not require two ./autogen.sh runs to permit "make"

* autogen.sh (bootstrap_hash): New function.
Running bootstrap may update the gnulib SHA1, yet we were computing
t=$(git submodule status ...) *prior* to running bootstrap, and
then recording that sometimes-stale value in the stamp file upon
a successful bootstrap run.  That would require two (lengthy!)
bootstrap runs to update the stamp file.
---
 autogen.sh |   21 ++++++++++++++-------
 1 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/autogen.sh b/autogen.sh
index ff94678..b93cdba 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -62,20 +62,27 @@ else
     fi
 fi

+# Compute the hash we'll use to determine whether rerunning bootstrap
+# is required.  The first is just the SHA1 that selects a gnulib snapshot.
+# The second ensures that whenever we change the set of gnulib modules used
+# by this package, we rerun bootstrap to pull in the matching set of files.
+bootstrap_hash()
+{
+    git submodule status | sed 's/^[ +-]//;s/ .*//'
+    git hash-object bootstrap.conf
+}
+
 # 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=$(git submodule status|sed 's/^[ +-]//;s/ .*//'; \
-    git hash-object bootstrap.conf)
+t=$(bootstrap_hash)
 if test "$t" = "$(cat $curr_status 2>/dev/null)"; then
     : # good, it's up to date, all we need is autoreconf
     autoreconf -if
 else
-  echo running bootstrap...
-  ./bootstrap && echo "$t" > $curr_status || {
-    echo "Failed to bootstrap gnulib, please investigate."
-    exit 1;
-  }
+    echo running bootstrap...
+    ./bootstrap && bootstrap_hash > $curr_status \
+      || { echo "Failed to bootstrap gnulib, please investigate."; exit 1; }
 fi

 cd "$THEDIR"
--
1.7.0.1

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