fast-import: Allow filemodify to set the root

diff --git a/t/t9300-fast-import.sh b/t/t9300-fast-import.sh
index 7c059204e90722db20bae1d10a0988853f852262..3c0cf0509d2cfe3afc0316ed50ea85cb0d2d14de 100755 (executable)
--- a/t/t9300-fast-import.sh
+++ b/t/t9300-fast-import.sh
@@ -874,6 +874,27 @@ test_expect_success \
         git diff-tree -C --find-copies-harder -r N4^ N4 >actual &&
         compare_diff_raw expect actual'
 
+test_expect_success \
+       'N: copy root directory by tree hash' \
+       'cat >expect <<-\EOF &&
+       :100755 000000 f1fb5da718392694d0076d677d6d0e364c79b0bc 0000000000000000000000000000000000000000 D      file3/newf
+       :100644 000000 7123f7f44e39be127c5eb701e5968176ee9d78b1 0000000000000000000000000000000000000000 D      file3/oldf
+       EOF
+        root=$(git rev-parse refs/heads/branch^0^{tree}) &&
+        cat >input <<-INPUT_END &&
+       commit refs/heads/N6
+       committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> $GIT_COMMITTER_DATE
+       data <<COMMIT
+       copy root directory by tree hash
+       COMMIT
+
+       from refs/heads/branch^0
+       M 040000 $root ""
+       INPUT_END
+        git fast-import <input &&
+        git diff-tree -C --find-copies-harder -r N4 N6 >actual &&
+        compare_diff_raw expect actual'
+
 test_expect_success \
        'N: modify copied tree' \
        'cat >expect <<-\EOF &&