fast-import: filemodify after M 040000 <tree> "" crashes

diff --git a/t/t9300-fast-import.sh b/t/t9300-fast-import.sh
index 96d07f183377f8822257cb3a1dad29023b391462..1df11adc907aac13b33c3f0e5dbf60467f597e3f 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 &&
@@ -907,6 +928,43 @@ test_expect_success \
         git diff-tree -C --find-copies-harder -r N5^^ N5 >actual &&
         compare_diff_raw expect actual'
 
+test_expect_success \
+       'N: copy to root by id and modify' \
+       'echo "hello, world" >expect.foo &&
+        echo hello >expect.bar &&
+        git fast-import <<-SETUP_END &&
+       commit refs/heads/N7
+       committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> $GIT_COMMITTER_DATE
+       data <<COMMIT
+       hello, tree
+       COMMIT
+
+       deleteall
+       M 644 inline foo/bar
+       data <<EOF
+       hello
+       EOF
+       SETUP_END
+
+        tree=$(git rev-parse --verify N7:) &&
+        git fast-import <<-INPUT_END &&
+       commit refs/heads/N8
+       committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> $GIT_COMMITTER_DATE
+       data <<COMMIT
+       copy to root by id and modify
+       COMMIT
+
+       M 040000 $tree ""
+       M 644 inline foo/foo
+       data <<EOF
+       hello, world
+       EOF
+       INPUT_END
+        git show N8:foo/foo >actual.foo &&
+        git show N8:foo/bar >actual.bar &&
+        test_cmp expect.foo actual.foo &&
+        test_cmp expect.bar actual.bar'
+
 ###
 ### series O
 ###
@@ -1110,11 +1168,10 @@ test_expect_success \
        'P: supermodule & submodule mix' \
        'git fast-import <input &&
         git checkout subuse1 &&
-        rm -rf sub && mkdir sub && cd sub &&
+        rm -rf sub && mkdir sub && (cd sub &&
         git init &&
         git fetch --update-head-ok .. refs/heads/sub:refs/heads/master &&
-        git checkout master &&
-        cd .. &&
+        git checkout master) &&
         git submodule init &&
         git submodule update'