[PATCH] fast-import: fix ls command with empty path

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There is a pathological Subversion operation that svn-fe handles
incorrectly due to an unexpected response from fast-import:

  svn cp $SVN_ROOT $SVN_ROOT/subdirectory

When the following command is sent to fast-import:

 'ls' SP ':1' SP LF

The expected output is:

 '040000' SP 'tree' SP <dataref> HT LF

The actual output is:

 'missing' SP LF

This is because tree_content_get() is called but expects a non-empty
path. Instead, copy the root entry and force the mode to S_IFDIR.

Reported-by: Andrew Sayers <andrew-git@xxxxxxxxxxxxxxx>
Signed-off-by: David Barr <davidbarr@xxxxxxxxxx>
---
 fast-import.c          |    7 ++++++-
 t/t9300-fast-import.sh |   31 +++++++++++++++++++++++++++++++
 2 files changed, 37 insertions(+), 1 deletion(-)

diff --git a/fast-import.c b/fast-import.c
index c1486ca..8dbfd4c 100644
--- a/fast-import.c
+++ b/fast-import.c
@@ -3019,7 +3019,12 @@ static void parse_ls(struct branch *b)
 			die("Garbage after path in: %s", command_buf.buf);
 		p = uq.buf;
 	}
-	tree_content_get(root, p, &leaf);
+	if (*p) {
+		tree_content_get(root, p, &leaf);
+	} else {
+		leaf = *root;
+		leaf.versions[1].mode = S_IFDIR;
+	}
 	/*
 	 * A directory in preparation would have a sha1 of zero
 	 * until it is saved.  Save, for simplicity.
diff --git a/t/t9300-fast-import.sh b/t/t9300-fast-import.sh
index 438aaf6..2558a2e 100755
--- a/t/t9300-fast-import.sh
+++ b/t/t9300-fast-import.sh
@@ -1400,6 +1400,37 @@ test_expect_success \
 	 test_cmp expect.qux actual.qux &&
 	 test_cmp expect.qux actual.quux'
 
+test_expect_success PIPE 'N: read and copy root' '
+	cat >expect <<-\EOF
+	:100755 100755 f1fb5da718392694d0076d677d6d0e364c79b0bc f1fb5da718392694d0076d677d6d0e364c79b0bc C100	file2/newf	file3/file2/newf
+	:100644 100644 7123f7f44e39be127c5eb701e5968176ee9d78b1 7123f7f44e39be127c5eb701e5968176ee9d78b1 C100	file2/oldf	file3/file2/oldf
+	:100755 100755 85df50785d62d3b05ab03d9cbf7e4a0b49449730 85df50785d62d3b05ab03d9cbf7e4a0b49449730 C100	file4	file3/file4
+	:100755 100755 e74b7d465e52746be2b4bae983670711e6e66657 e74b7d465e52746be2b4bae983670711e6e66657 C100	newdir/exec.sh	file3/newdir/exec.sh
+	:100644 100644 fcf778cda181eaa1cbc9e9ce3a2e15ee9f9fe791 fcf778cda181eaa1cbc9e9ce3a2e15ee9f9fe791 C100	newdir/interesting	file3/newdir/interesting
+	EOF
+	git update-ref -d refs/heads/N12 &&
+	rm -f backflow &&
+	mkfifo backflow &&
+	(
+		exec <backflow &&
+		cat <<-EOF &&
+		commit refs/heads/N12
+		committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> $GIT_COMMITTER_DATE
+		data <<COMMIT
+		copy root directory by tree hash read via ls
+		COMMIT
+
+		from refs/heads/branch^0
+		ls ""
+		EOF
+		read mode type tree filename &&
+		echo "M 040000 $tree file3"
+	) |
+	git fast-import --cat-blob-fd=3 3>backflow &&
+	git diff-tree -C --find-copies-harder -r N12^ N12 >actual &&
+	compare_diff_raw expect actual
+'
+
 ###
 ### series O
 ###
-- 
1.7.9.3

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