[PATCH 2/7] contrib/subtree: Use %B for Split Subject/Body

["David A. Greene" <greened@obbligato.org>]

From: Techlive Zheng <techlivezheng@gmail.com>

Use %B to format the commit message and body to avoid an extra newline
if a commit only has a subject line.

Signed-off-by: Techlive Zheng <techlivezheng@gmail.com>

Signed-off-by: David A. Greene <greened@obbligato.org>
---
 contrib/subtree/git-subtree.sh     |    6 +++++-
 contrib/subtree/t/t7900-subtree.sh |   15 +++++++++++++++
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/contrib/subtree/git-subtree.sh b/contrib/subtree/git-subtree.sh
index 920c664..5341b36 100755
--- a/contrib/subtree/git-subtree.sh
+++ b/contrib/subtree/git-subtree.sh
@@ -296,7 +296,11 @@ copy_commit()
 	# We're going to set some environment vars here, so
 	# do it in a subshell to get rid of them safely later
 	debug copy_commit "{$1}" "{$2}" "{$3}"
-	git log -1 --pretty=format:'%an%n%ae%n%ad%n%cn%n%ce%n%cd%n%s%n%n%b' "$1" |
+	# Use %B rather than %s%n%n%b to handle the special case of a
+	# commit that only has a subject line.  We don't want to
+	# introduce a newline after the subject, causing generation of
+	# a new hash.
+	git log -1 --pretty=format:'%an%n%ae%n%ad%n%cn%n%ce%n%cd%n%B' "$1" |
 	(
 		read GIT_AUTHOR_NAME
 		read GIT_AUTHOR_EMAIL
diff --git a/contrib/subtree/t/t7900-subtree.sh b/contrib/subtree/t/t7900-subtree.sh
index 6cf9fb9..3f17f55 100755
--- a/contrib/subtree/t/t7900-subtree.sh
+++ b/contrib/subtree/t/t7900-subtree.sh
@@ -74,6 +74,10 @@ test_expect_success 'add sub1' '
         git branch -m master subproj
 '
 
+# Save this hash for testing later.
+
+subdir_hash=`git rev-parse HEAD`
+
 test_expect_success 'add sub2' '
         create sub2 &&
         git commit -m "sub2" &&
@@ -211,6 +215,17 @@ test_expect_success 'check split with --branch' '
         check_equal ''"$(git rev-parse splitbr1)"'' "$spl1"
 '
 
+test_expect_success 'check hash of split' '
+        spl1=$(git subtree split --prefix subdir) &&
+        undo &&
+        git subtree split --prefix subdir --branch splitbr1test &&
+        check_equal ''"$(git rev-parse splitbr1test)"'' "$spl1"
+        git checkout splitbr1test &&
+        new_hash=$(git rev-parse HEAD~2) &&
+        git checkout mainline &&
+        check_equal ''"$new_hash"'' "$subdir_hash"
+'
+
 test_expect_success 'check split with --branch for an existing branch' '
         spl1=''"$(git subtree split --annotate='"'*'"' --prefix subdir --onto FETCH_HEAD --message "Split & rejoin" --rejoin)"'' &&
         undo &&
-- 
1.7.10.4