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>

diff --git a/builtin-fast-export.c b/builtin-fast-export.c
index fdf4ae9ebdba7832a0ac736d56a7b564bba41baa..34a419c38e15998e82c9daf5627154d491e1af04 100644 (file)
--- a/builtin-fast-export.c
+++ b/builtin-fast-export.c
@@ -221,7 +221,8 @@ static void handle_commit(struct commit *commit, struct rev_info *rev)
        if (message)
                message += 2;
 
-       if (commit->parents) {
+       if (commit->parents &&
+           get_object_mark(&commit->parents->item->object) != 0) {
                parse_commit(commit->parents->item);
                diff_tree_sha1(commit->parents->item->tree->object.sha1,
                               commit->tree->object.sha1, "", &rev->diffopt);

diff --git a/t/t9301-fast-export.sh b/t/t9301-fast-export.sh
index 86c376088ccd04d0b0cbb14424eef7a9b89b45d3..b860626bee818d77509022d67121b37eab0ced07 100755 (executable)
--- 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)
 
 '