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

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

Sam Vilain [off-list ref] wrote:

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

git-merge-ff.sh should be executable, added to .gitignore and the
strategy should be added to the available strategies.

And somehow it did not work for me at all:

% git merge -s ff origin/master
git-merge.sh: needs update   
Trying really trivial in-index merge...
Wonderful.
In-index merge
[..]
% git show HEAD|grep Merge
Merge: 117a93c... f578825...
    Merge commit 'origin/master'

Hi,

On Thu, 28 Jun 2007, Matthias Lederhofer wrote:

Sam Vilain [off-list ref] wrote:

quoted

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

git-merge-ff.sh should be executable, added to .gitignore and the
strategy should be added to the available strategies.

And somehow it did not work for me at all:

% git merge -s ff origin/master
git-merge.sh: needs update   
Trying really trivial in-index merge...
Wonderful.
In-index merge
[..]
% git show HEAD|grep Merge
Merge: 117a93c... f578825...
    Merge commit 'origin/master'

To prevent something like this to happen, may I suggest adding a really 
simple, small test case?

Ciao,
Dscho