This tests basic functionality and also exercises a bug noticed
by Keith Packard, (prune_cache followed by add_index_entry can
trigger an attempt to realloc a pointer into the middle of an
allocated buffer).
---
 t/t3060-ls-files-with-head.sh |   53 +++++++++++++++++++++++++++++++++++++++++
 1 files changed, 53 insertions(+), 0 deletions(-)
 create mode 100755 t/t3060-ls-files-with-head.sh

 On Tue, 02 Oct 2007 22:55:57 -0700, Junio C Hamano wrote:
 >
 > Thanks for catching this.  This code originally was perfectly
 > Ok, but I broke it with the overlay_tree() change.

 Yeah, Keith and I were really scratching our heads as to how this
 hadn't caused more problems earlier. I wrote the test case below to
 explore the issue and found the recent overlay_tree change as you
 mention, and that made more sense.

 I didn't notice any existing --with-tree test case, so perhaps the
 patch below is useful.

 -Carl

diff --git a/t/t3060-ls-files-with-head.sh b/t/t3060-ls-files-with-head.sh
new file mode 100755
index 0000000..4ead08b
--- /dev/null
+++ b/t/t3060-ls-files-with-head.sh
@@ -0,0 +1,53 @@
+#!/bin/sh
+#
+# Copyright (c) 2007 Carl D. Worth
+#
+
+test_description='git ls-files test (--with-head).
+
+This test runs git ls-files --with-head and in particular in
+a scenario known to trigger a crash with some versions of git.
+'
+. ./test-lib.sh
+
+# The bug we're exercising requires a fair number of entries in a
+# sub-directory so that add_index_entry will trigger a realloc
+echo file > expected
+mkdir sub
+for num in $(seq -f%04g 1 50); do
+	touch sub/file-$num
+	echo file-$num >> expected
+done
+git add .
+git commit -m "add a bunch of files"
+
+# We remove them all so that we'll have something to add back with
+# --with-head and so that we'll definitely be under the realloc size
+# to trigger the bug.
+rm -r sub
+git commit -a -m "remove them all"
+
+# The bug also requires some entry before our directory so that
+# prune_path will modify the_index.cache
+mkdir a_directory_that_sorts_before_sub
+touch a_directory_that_sorts_before_sub/file
+mkdir sub
+touch sub/file
+git add .
+
+# We have to run from a sub-directory to trigger prune_path
+cd sub
+
+# Then we finally get to run our --with-tree test
+test_expect_success \
+    'git -ls-files --with-tree should succeed.' \
+    'git ls-files --with-tree=HEAD~1 >../output'
+
+cd ..
+test_expect_success \
+    'git -ls-files --with-tree should add entries from named tree.' \
+    'diff output expected'
+
+test_done
+
+
--
1.5.3.3.131.g34c6d