[PATCH v2] blame: Allow to blame paths freshly added to the index

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When blaming files, changes in the work tree are taken into account
and displayed as being "Not Committed Yet".

However, when blaming a file that is not known to the current HEAD,
git blame fails with `no such path 'foo' in HEAD`, even when the file
was git add'ed.

This would seem uninteresting with the plain `git blame` case, which
it is, but it becomes useful when using copy detection, and the new file
was created from pieces already in HEAD, moved or copied from other
files.

Signed-off-by: Mike Hommey <mh@xxxxxxxxxxxx>
---
 builtin/blame.c               |  4 ++-
 t/t8003-blame-corner-cases.sh | 57 ++++++++++++++++++++++++++++++-------------
 2 files changed, 43 insertions(+), 18 deletions(-)

diff --git a/builtin/blame.c b/builtin/blame.c
index 1e214bd..0858b18 100644
--- a/builtin/blame.c
+++ b/builtin/blame.c
@@ -2240,7 +2240,9 @@ static void verify_working_tree_path(struct commit *work_tree, const char *path)
 		    sha1_object_info(blob_sha1, NULL) == OBJ_BLOB)
 			return;
 	}
-	die("no such path '%s' in HEAD", path);
+
+	if (cache_name_pos(path, strlen(path)) < 0)
+		die("no such path '%s' in HEAD", path);
 }
 
 static struct commit_list **append_parent(struct commit_list **tail, const unsigned char *sha1)
diff --git a/t/t8003-blame-corner-cases.sh b/t/t8003-blame-corner-cases.sh
index a9b266f..2812d7c 100755
--- a/t/t8003-blame-corner-cases.sh
+++ b/t/t8003-blame-corner-cases.sh
@@ -41,12 +41,12 @@ test_expect_success setup '
 	test_tick &&
 	GIT_AUTHOR_NAME=Fourth git commit -m Fourth &&
 
-	{
-		echo ABC
-		echo DEF
-		echo XXXX
-		echo GHIJK
-	} >cow &&
+	cat >cow <<-\EOF &&
+	ABC
+	DEF
+	XXXX
+	GHIJK
+	EOF
 	git add cow &&
 	test_tick &&
 	GIT_AUTHOR_NAME=Fifth git commit -m Fifth
@@ -115,11 +115,11 @@ test_expect_success 'append with -C -C -C' '
 test_expect_success 'blame wholesale copy' '
 
 	git blame -f -C -C1 HEAD^ -- cow | sed -e "$pick_fc" >current &&
-	{
-		echo mouse-Initial
-		echo mouse-Second
-		echo mouse-Third
-	} >expected &&
+	cat >expected <<-\EOF &&
+	mouse-Initial
+	mouse-Second
+	mouse-Third
+	EOF
 	test_cmp expected current
 
 '
@@ -127,12 +127,35 @@ test_expect_success 'blame wholesale copy' '
 test_expect_success 'blame wholesale copy and more' '
 
 	git blame -f -C -C1 HEAD -- cow | sed -e "$pick_fc" >current &&
-	{
-		echo mouse-Initial
-		echo mouse-Second
-		echo cow-Fifth
-		echo mouse-Third
-	} >expected &&
+	cat >expected <<-\EOF &&
+	mouse-Initial
+	mouse-Second
+	cow-Fifth
+	mouse-Third
+	EOF
+	test_cmp expected current
+
+'
+
+test_expect_success 'blame wholesale copy and more in the index' '
+
+	cat >horse <<-\EOF &&
+	ABC
+	DEF
+	XXXX
+	YYYY
+	GHIJK
+	EOF
+	git add horse &&
+	test_when_finished "git rm -f horse" &&
+	git blame -f -C -C1 -- horse | sed -e "$pick_fc" >current &&
+	cat >expected <<-\EOF &&
+	mouse-Initial
+	mouse-Second
+	cow-Fifth
+	horse-Not
+	mouse-Third
+	EOF
 	test_cmp expected current
 
 '
-- 
2.9.1.276.geea30e8

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