[OSSTEST PATCH 36/38] buster: setupboot_grub2: Handle missing policy file bug

[Ian Jackson <ian.jackson@xxxxxxxxxxxxx>]

This is a complex interaction between update-grub and the Xen build
system on ARM64.  Not sure exactly who to blame but since we have our
own 20_linux_xen bodge, let's wait until we don't.

Signed-off-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
---
 Osstest/Debian.pm | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/Osstest/Debian.pm b/Osstest/Debian.pm
index c0b669c9..6c289cc7 100644
--- a/Osstest/Debian.pm
+++ b/Osstest/Debian.pm
@@ -496,7 +496,17 @@ sub setupboot_grub2 ($$$$) {
                         " kernel $entry->{KernVer}, not $want_kernver)");
                } elsif ($want_xsm && !defined $entry->{Xenpolicy}) {
                    logm("(skipping entry at $entry->{StartLine}..$.;".
-                        " XSM policy file not present)");
+                        " XSM policy file not mentioned)");
+               } elsif ($ho->{Suite} =~ m/buster/ &&
+                        defined $entry->{Xenpolicy} &&
+                        !$bootfiles{
+                             $entry->{Xenpolicy} =~ m{^/?} ? $' : die
+                                                }) {
+                   # Our 20_linux_xen bodge with buster's update-grub
+                   # generates entries which mention /boot/xenpolicy-xen
+                   # even though that file doesn't exist on ARM64.
+                   logm("(skipping entry at $entry->{StartLine}..$.;".
+                        " XSM policy file not on disk!)");
                } else {
                    # yes!
                    last;
-- 
2.20.1