From 359505490d02cf0ba5df03e298e15ed05b133e1b Mon Sep 17 00:00:00 2001
From: Michael Marineau <michael.marineau@coreos.com>
Date: Sat, 28 Dec 2013 16:56:21 -0800
Subject: [PATCH] fix(disk_util): Install syslinux as part of filesystem
 formatting.

This means scripts later don't need to deal with the ESP block device
directly, they can just copy the config files into place.
---
 build_library/disk_util               | 14 ++++++++++++++
 build_library/legacy_disk_layout.json |  3 ++-
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/build_library/disk_util b/build_library/disk_util
index 6ea07fa57d..f1b4514324 100755
--- a/build_library/disk_util
+++ b/build_library/disk_util
@@ -8,6 +8,7 @@ import json
 import os
 import subprocess
 import sys
+import tempfile
 import uuid
 
 # First sector we can use.
@@ -283,6 +284,19 @@ def FormatFat(part, device):
                      vfat_blocks],
                      stdout_null=True)
 
+  if 'syslinux' in part.get('features', []):
+    # The syslinux directory must exist before installing ldlinux.sys to it.
+    vfat_mount = tempfile.mkdtemp()
+    Sudo(['mount', '-t', 'vfat', device, vfat_mount])
+    try:
+      Sudo(['mkdir', os.path.join(vfat_mount, 'syslinux')])
+    finally:
+      Sudo(['umount', vfat_mount])
+      os.rmdir(vfat_mount)
+
+    Sudo(['syslinux', '-d', '/syslinux', device])
+    print "Installed SYSLINUX to %s" % part['label']
+
 
 def Format(options):
   """Writes the given partition table and initialize fresh filesystems.
diff --git a/build_library/legacy_disk_layout.json b/build_library/legacy_disk_layout.json
index dbe1628d9b..31248796dd 100644
--- a/build_library/legacy_disk_layout.json
+++ b/build_library/legacy_disk_layout.json
@@ -12,7 +12,8 @@
         "type":"efi",
         "blocks":"262144",
         "fs_type":"vfat",
-        "mount":"/boot/efi"
+        "mount":"/boot/efi",
+        "features": ["syslinux"]
       },
       "2":{
         "label":"BOOT-B",