t0001: fix on case-insensitive filesystems

On a case-insensitive filesystem, such as HFS+ or NTFS, it is possible
that the idea Bash has of the current directory differs in case from
what Git thinks it is. That's totally okay, though, and we should not
expect otherwise.

Reported by Jameson Miller.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

t/t0001-init.sh

@@ -307,10 +307,20 @@ test_expect_success 'init prefers command line to GIT_DIR' '
 	test_path_is_missing otherdir/refs
 '
 
+downcase_on_case_insensitive_fs () {
+	test false = "$(git config --get core.filemode)" || return 0
+	for f
+	do
+		tr A-Z a-z <"$f" >"$f".downcased &&
+		mv -f "$f".downcased "$f" || return 1
+	done
+}
+
 test_expect_success 'init with separate gitdir' '
 	rm -rf newdir &&
 	git init --separate-git-dir realgitdir newdir &&
 	echo "gitdir: $(pwd)/realgitdir" >expected &&
+	downcase_on_case_insensitive_fs expected newdir/.git &&
 	test_cmp expected newdir/.git &&
 	test_path_is_dir realgitdir/refs
 '
@@ -365,6 +375,7 @@ test_expect_success 're-init to update git link' '
 	git init --separate-git-dir ../surrealgitdir
 	) &&
 	echo "gitdir: $(pwd)/surrealgitdir" >expected &&
+	downcase_on_case_insensitive_fs expected newdir/.git &&
 	test_cmp expected newdir/.git &&
 	test_path_is_dir surrealgitdir/refs &&
 	test_path_is_missing realgitdir/refs
@@ -378,6 +389,7 @@ test_expect_success 're-init to move gitdir' '
 	git init --separate-git-dir ../realgitdir
 	) &&
 	echo "gitdir: $(pwd)/realgitdir" >expected &&
+	downcase_on_case_insensitive_fs expected newdir/.git &&
 	test_cmp expected newdir/.git &&
 	test_path_is_dir realgitdir/refs
 '