[Xen-devel] [PATCH OSSTEST v3 14/22] Debian: Do not add Debian to UEFI boot order on install

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

By default Debian inserts itself before any existing entries,
including the PXE one, meaning we otherwise cannot remotely regroove
the box.

Add a hook to /usr/lib/base-installer.d/ which installs a diversion of
/usr/sbin/grub-install and installs a wrapper which adds the
--no-nvram argument which prevents grub-install from adding the boot
entries.

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
v3: New patch replacing "Debian: Fixup UEFI boot order during install"
---
 Osstest/Debian.pm | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/Osstest/Debian.pm b/Osstest/Debian.pm
index 9e1e69e..437faab 100644
--- a/Osstest/Debian.pm
+++ b/Osstest/Debian.pm
@@ -1018,6 +1018,31 @@ END
 
     preseed_microcode($ho,$sfx);
 
+    if (get_host_property($ho, "firmware") eq "uefi" &&
+       $ho->{Suite} =~ m/jessie/) {
+       # Prevent grub-install from making a new Debian boot entry, so
+       # we always reboot from PXE. Debian bug #789798 proposes a
+       # properly preseedable solution to this.
+       preseed_hook_installscript($ho, $sfx,
+               '/usr/lib/base-installer.d/',
+               'osstest-disable-grub-nvram', <<'END');
+#!/bin/sh
+set -ex
+
+logger -t osstest-disable-grub-nvram "Adding our grub-install wrapper"
+
+t=/usr/sbin/grub-install
+
+in-target dpkg-divert --divert $t.osstest --rename --add $t
+
+cat >/target/$t <<EOF
+#!/bin/sh
+exec $t.osstest --no-nvram \$@
+EOF
+chmod +x /target/$t
+END
+    }
+
     $preseed_file .= preseed_hook_cmds();
 
     if ($ho->{Flags}{'no-di-kernel'}) {
-- 
2.1.4


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