RE: Disappearing change on pull rebase

As mentioned in the original mail - the merge commit did have changes. Here's the log of reproducing it. The line containing "2" in changelog is gone from master after pull --rebase.

$ git init fake_upstream
Initialized empty Git repository in /tmp/fake_upstream/.git/
$ cd fake_upstream/ 
fake_upstream$ echo some_content > test
fake_upstream$ echo 1 > changelog
fake_upstream$ git add test changelog 
fake_upstream$ git commit -m 'first commit'
[master (root-commit) b1b683d] first commit
 2 files changed, 2 insertions(+), 0 deletions(-)
 create mode 100644 changelog
 create mode 100644 test
fake_upstream$ cd ..

$ git clone /tmp/fake_upstream/ disappearing_commit
Cloning into disappearing_commit...
done.
$ cd disappearing_commit/
disappearing_commit$ git checkout -b some-branch
Switched to a new branch 'some-branch'
disappearing_commit$ echo blah >> test
disappearing_commit$ git commit test -m 'branch modification'
[some-branch 528f166] branch modification
 1 files changed, 1 insertions(+), 0 deletions(-)
disappearing_commit$ git checkout master
Switched to branch 'master'

disappearing_commit$ git merge --no-ff --no-commit some-branch
Automatic merge went well; stopped before committing as requested
disappearing_commit$ echo 2 >> changelog 
disappearing_commit$ git add changelog
disappearing_commit$ git commit
[master e41e4c9] Merge branch 'some-branch'

disappearing_commit$ git show
commit e41e4c963a72528e3b2b5945ca419e19cdba1e4b
Merge: b1b683d 528f166
Author: Stanislaw Pitucha [off-list ref]
Date:   Thu Nov 10 13:30:04 2011 +0000

    Merge branch 'some-branch'

diff --cc changelog
index d00491f,d00491f..1191247

--- a/changelog
+++ b/changelog

@@@ -1,1 -1,1 +1,2 @@@
  1
++2
disappearing_commit$ git pull --rebase
First, rewinding head to replay your work on top of it...
Applying: branch modification
disappearing_commit$ git show
commit ef8f5e40db9fe7efbd4e493ff68b12327acde283
Author: Stanislaw Pitucha [off-list ref]
Date:   Thu Nov 10 13:29:33 2011 +0000

    branch modification

diff --git a/test b/test
index 6e099dc..2f3f685 100644
--- a/test
+++ b/test

@@ -1 +1,2 @@
 some_content
+blah

Regards,
Stanisław Pitucha
Cloud Services 
Hewlett Packard