When applying two pathspecs, one of which is named as a prefix to the
other, we mistakenly recursed into the shorter one.

Noticed and fixed by David Reis.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
---

  Junio C Hamano <gitster@pobox.com> writes:

  > Matthieu Moy <Matthieu.Moy@grenoble-inp.fr> writes:
  >
  >> That's so close to a real test-case...
  >
  > Let's do this.
  >
  >  * t3101 seems somewhat stale; fix the style and add a few missing " &&"
  >    cascades as a preparatory patch.
  >
  >  * Add the "mistaken prefix computation causes unwarranted recursion" fix
  >    with a test.
  >
  > Here is the first one in such a series.

  and here is the second one.

 builtin/ls-tree.c          |    2 ++
 t/t3101-ls-tree-dirname.sh |   20 +++++++++++++++++++-
 2 files changed, 21 insertions(+), 1 deletions(-)

diff --git a/builtin/ls-tree.c b/builtin/ls-tree.c
index dc86b0d..a818756 100644
--- a/builtin/ls-tree.c
+++ b/builtin/ls-tree.c
@@ -52,6 +52,8 @@ static int show_recursive(const char *base, int baselen, const char *pathname)
 		speclen = strlen(spec);
 		if (speclen <= len)
 			continue;
+		if (spec[len] && spec[len] != '/')
+			continue;
 		if (memcmp(pathname, spec, len))
 			continue;
 		return 1;
diff --git a/t/t3101-ls-tree-dirname.sh b/t/t3101-ls-tree-dirname.sh
index 026f9f8..ed8160c 100755
--- a/t/t3101-ls-tree-dirname.sh
+++ b/t/t3101-ls-tree-dirname.sh
@@ -15,6 +15,7 @@ This test runs git ls-tree with the following in a tree.
     path2/1.txt        - a file in a directory
     path3/1.txt        - a file in a directory
     path3/2.txt        - a file in a directory
+    path30/3.txt       - a file in a directory
 
 Test the handling of mulitple directories which have matching file
 entries.  Also test odd filename and missing entries handling.
@@ -24,7 +25,7 @@ entries.  Also test odd filename and missing entries handling.
 test_expect_success 'setup' '
 	echo 111 >1.txt &&
 	echo 222 >2.txt &&
-	mkdir path0 path0/a path0/a/b path0/a/b/c &&
+	mkdir path0 path0/a path0/a/b path0/a/b/c path30 &&
 	echo 111 >path0/a/b/c/1.txt &&
 	mkdir path1 path1/b path1/b/c &&
 	echo 111 >path1/b/c/1.txt &&
@@ -33,6 +34,7 @@ test_expect_success 'setup' '
 	mkdir path3 &&
 	echo 111 >path3/1.txt &&
 	echo 222 >path3/2.txt &&
+	echo 333 >path30/3.txt &&
 	find *.txt path* \( -type f -o -type l \) -print |
 	xargs git update-index --add &&
 	tree=`git write-tree` &&
@@ -53,6 +55,7 @@ test_expect_success 'ls-tree plain' '
 040000 tree X	path1
 040000 tree X	path2
 040000 tree X	path3
+040000 tree X	path30
 EOF
 	test_output
 '
@@ -68,6 +71,7 @@ test_expect_success 'ls-tree recursive' '
 100644 blob X	path2/1.txt
 100644 blob X	path3/1.txt
 100644 blob X	path3/2.txt
+100644 blob X	path30/3.txt
 EOF
 	test_output
 '
@@ -164,6 +168,7 @@ test_expect_success 'ls-tree --full-tree' '
 040000 tree X	path1
 040000 tree X	path2
 040000 tree X	path3
+040000 tree X	path30
 EOF
 	test_output
 '
@@ -181,6 +186,7 @@ test_expect_success 'ls-tree --full-tree -r' '
 100644 blob X	path2/1.txt
 100644 blob X	path3/1.txt
 100644 blob X	path3/2.txt
+100644 blob X	path30/3.txt
 EOF
 	test_output
 '
@@ -195,6 +201,7 @@ test_expect_success 'ls-tree --abbrev=5' '
 040000 tree X	path1
 040000 tree X	path2
 040000 tree X	path3
+040000 tree X	path30
 EOF
 	test_cmp expected check
 '
@@ -208,6 +215,7 @@ path0
 path1
 path2
 path3
+path30
 EOF
 	test_output
 '
@@ -222,6 +230,16 @@ path1/b/c/1.txt
 path2/1.txt
 path3/1.txt
 path3/2.txt
+path30/3.txt
+EOF
+	test_output
+'
+
+test_expect_success 'ls-tree with two dirnames' '
+	git ls-tree --name-only $tree path3 path30 >current &&
+	cat >expected <<\EOF &&
+path3
+path30
 EOF
 	test_output
 '
-- 
1.7.3.rc1.215.g6997c
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