1 files changed, 177 insertions, 0 deletions
diff --git a/t/t4011-diff-symlink.sh b/t/t4011-diff-symlink.sh
new file mode 100755
index 0000000..d7a5f7a
--- /dev/null
+++ b/t/t4011-diff-symlink.sh
@@ -0,0 +1,177 @@
+#!/bin/sh
+#
+# Copyright (c) 2005 Johannes Schindelin
+#
+
+test_description='Test diff of symlinks.
+
+'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-diff.sh
+
+# Print the short OID of a symlink with the given name.
+symlink_oid () {
+	local oid=$(printf "%s" "$1" | git hash-object --stdin) &&
+	git rev-parse --short "$oid"
+}
+
+# Print the short OID of the given file.
+short_oid () {
+	local oid=$(git hash-object "$1") &&
+	git rev-parse --short "$oid"
+}
+
+test_expect_success 'diff new symlink and file' '
+	symlink=$(symlink_oid xyzzy) &&
+	cat >expected <<-EOF &&
+	diff --git a/frotz b/frotz
+	new file mode 120000
+	index 0000000..$symlink
+	--- /dev/null
+	+++ b/frotz
+	@@ -0,0 +1 @@
+	+xyzzy
+	\ No newline at end of file
+	diff --git a/nitfol b/nitfol
+	new file mode 100644
+	index 0000000..$symlink
+	--- /dev/null
+	+++ b/nitfol
+	@@ -0,0 +1 @@
+	+xyzzy
+	EOF
+
+	# the empty tree
+	git update-index &&
+	tree=$(git write-tree) &&
+
+	test_ln_s_add xyzzy frotz &&
+	echo xyzzy >nitfol &&
+	git update-index --add nitfol &&
+	GIT_DIFF_OPTS=--unified=0 git diff-index -M -p $tree >current &&
+	compare_diff_patch expected current
+'
+
+test_expect_success 'diff unchanged symlink and file'  '
+	tree=$(git write-tree) &&
+	git update-index frotz nitfol &&
+	test -z "$(git diff-index --name-only $tree)"
+'
+
+test_expect_success 'diff removed symlink and file' '
+	cat >expected <<-EOF &&
+	diff --git a/frotz b/frotz
+	deleted file mode 120000
+	index $symlink..0000000
+	--- a/frotz
+	+++ /dev/null
+	@@ -1 +0,0 @@
+	-xyzzy
+	\ No newline at end of file
+	diff --git a/nitfol b/nitfol
+	deleted file mode 100644
+	index $symlink..0000000
+	--- a/nitfol
+	+++ /dev/null
+	@@ -1 +0,0 @@
+	-xyzzy
+	EOF
+	mv frotz frotz2 &&
+	mv nitfol nitfol2 &&
+	git diff-index -M -p $tree >current &&
+	compare_diff_patch expected current
+'
+
+test_expect_success 'diff identical, but newly created symlink and file' '
+	>expected &&
+	rm -f frotz nitfol &&
+	echo xyzzy >nitfol &&
+	test-tool chmtime +10 nitfol &&
+	if test_have_prereq SYMLINKS
+	then
+		ln -s xyzzy frotz
+	else
+		printf xyzzy >frotz
+		# the symlink property propagates from the index
+	fi &&
+	git diff-index -M -p $tree >current &&
+	compare_diff_patch expected current &&
+
+	>expected &&
+	git diff-index -M -p -w $tree >current &&
+	compare_diff_patch expected current
+'
+
+test_expect_success 'diff different symlink and file' '
+	new=$(symlink_oid yxyyz) &&
+	cat >expected <<-EOF &&
+	diff --git a/frotz b/frotz
+	index $symlink..$new 120000
+	--- a/frotz
+	+++ b/frotz
+	@@ -1 +1 @@
+	-xyzzy
+	\ No newline at end of file
+	+yxyyz
+	\ No newline at end of file
+	diff --git a/nitfol b/nitfol
+	index $symlink..$new 100644
+	--- a/nitfol
+	+++ b/nitfol
+	@@ -1 +1 @@
+	-xyzzy
+	+yxyyz
+	EOF
+	rm -f frotz &&
+	if test_have_prereq SYMLINKS
+	then
+		ln -s yxyyz frotz
+	else
+		printf yxyyz >frotz
+		# the symlink property propagates from the index
+	fi &&
+	echo yxyyz >nitfol &&
+	git diff-index -M -p $tree >current &&
+	compare_diff_patch expected current
+'
+
+test_expect_success SYMLINKS 'diff symlinks with non-existing targets' '
+	ln -s narf pinky &&
+	ln -s take\ over brain &&
+	test_must_fail git diff --no-index pinky brain >output 2>output.err &&
+	grep narf output &&
+	test_must_be_empty output.err
+'
+
+test_expect_success SYMLINKS 'setup symlinks with attributes' '
+	echo "*.bin diff=bin" >>.gitattributes &&
+	echo content >file.bin &&
+	ln -s file.bin link.bin &&
+	git add -N file.bin link.bin
+'
+
+test_expect_success SYMLINKS 'symlinks do not respect userdiff config by path' '
+	file=$(short_oid file.bin) &&
+	link=$(symlink_oid file.bin) &&
+	cat >expect <<-EOF &&
+	diff --git a/file.bin b/file.bin
+	new file mode 100644
+	index 0000000..$file
+	Binary files /dev/null and b/file.bin differ
+	diff --git a/link.bin b/link.bin
+	new file mode 120000
+	index 0000000..$link
+	--- /dev/null
+	+++ b/link.bin
+	@@ -0,0 +1 @@
+	+file.bin
+	\ No newline at end of file
+	EOF
+	git config diff.bin.binary true &&
+	git diff file.bin link.bin >actual &&
+	test_cmp expect actual
+'
+
+test_done