fast-export: Avoid dropping files from commits

When exporting a subset of commits on a branch that do not go back to a
root commit (e.g. master~2..master), we still want each exported commit to
have the same files in the exported tree as in the original tree.

Previously, when given such a range, we would omit master~2 as a parent of
master~1, but we would still diff against master~2 when selecting the list
of files to include in master~1.  This would result in only files that
had changed in the given range showing up in the resulting export.  In such
cases, we should diff master~1 against the root instead (i.e. use
diff_root_tree_sha1 instead of diff_tree_sha1).

There's a special case to consider here: incremental exports (i.e. exports
where the --import-marks flag is specified).  If master~2 is an imported
mark, then we still want to diff master~1 against master~2 when selecting
the list of files to include.

We can handle all cases, including the special case, by just checking
whether master~2 corresponds to a known object mark when deciding what to
diff against.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/t/t9301-fast-export.sh b/t/t9301-fast-export.sh
index 86c376088..b860626be 100755
--- a/t/t9301-fast-export.sh
+++ b/t/t9301-fast-export.sh
@@ -8,6 +8,9 @@ test_description='git fast-export'
 
 test_expect_success 'setup' '
 
+	echo break it > file0 &&
+	git add file0 &&
+	test_tick &&
 	echo Wohlauf > file &&
 	git add file &&
 	test_tick &&
@@ -57,8 +60,8 @@ test_expect_success 'fast-export master~2..master' '
 		(cd new &&
 		 git fast-import &&
 		 test $MASTER != $(git rev-parse --verify refs/heads/partial) &&
-		 git diff master..partial &&
-		 git diff master^..partial^ &&
+		 git diff --exit-code master partial &&
+		 git diff --exit-code master^ partial^ &&
 		 test_must_fail git rev-parse partial~2)
 
 '