[PATCH] git-merge-ff: fast-forward only merge

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This is primarily so that there is an easy switch to 'git-pull' to
be sure to fast forward only.
---
 Documentation/merge-strategies.txt |    5 +++++
 Makefile                           |    2 +-
 git-merge-ff.sh                    |    8 ++++++++
 3 files changed, 14 insertions(+), 1 deletions(-)
 create mode 100644 git-merge-ff.sh

diff --git a/Documentation/merge-strategies.txt b/Documentation/merge-strategies.txt
index 7df0266..00739bc 100644
--- a/Documentation/merge-strategies.txt
+++ b/Documentation/merge-strategies.txt
@@ -33,3 +33,8 @@ ours::
 	merge is always the current branch head.  It is meant to
 	be used to supersede old development history of side
 	branches.
+
+ff::
+	This is a degenerate merge strategy that always fails, which
+	means that the only time the target branch will change is if
+	there was no merge ("fast-forward" merge only).
diff --git a/Makefile b/Makefile
index 29243c6..6311eb5 100644
--- a/Makefile
+++ b/Makefile
@@ -208,7 +208,7 @@ SCRIPT_SH = \
 	git-tag.sh git-verify-tag.sh \
 	git-applymbox.sh git-applypatch.sh git-am.sh \
 	git-merge.sh git-merge-stupid.sh git-merge-octopus.sh \
-	git-merge-resolve.sh git-merge-ours.sh \
+	git-merge-resolve.sh git-merge-ours.sh git-merge-ff.sh \
 	git-lost-found.sh git-quiltimport.sh
 
 SCRIPT_PERL = \
diff --git a/git-merge-ff.sh b/git-merge-ff.sh
new file mode 100644
index 0000000..b0e0f85
--- /dev/null
+++ b/git-merge-ff.sh
@@ -0,0 +1,8 @@
+#!/bin/sh
+#
+# Copyright (c) 2007 Sam Vilain
+#
+# A degenerate merge strategy that only allows fast-forwarding.
+#
+
+exit 1;
-- 
1.5.2.1.1131.g3b90

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