Specifying 'boot: order=' was intended to be used for an empty bootorder
(i.e. no boot devices), but as it turns out our format parser doesn't
like empty '-list' properties if they are nested in a subformat.

Fixing this in JSONSchema sounds like a risky move, so instead just
write 'boot: ' (without 'order=') to indicate an empty bootorder. The
rest of the code handles it just fine, as this was valid before too.

Incidentally also fixes a bug where you couldn't create a new VM without
any disks if no explicit 'boot' property was specified (i.e. a simple
'qm create 100' without any parameters would fail).

Reported-by: Dominic Jäger <d.jae...@proxmox.com>
Signed-off-by: Stefan Reiter <s.rei...@proxmox.com>
---
 PVE/QemuServer.pm | 1 +
 1 file changed, 1 insertion(+)

diff --git a/PVE/QemuServer.pm b/PVE/QemuServer.pm
index 5cf7288..20e284c 100644
--- a/PVE/QemuServer.pm
+++ b/PVE/QemuServer.pm
@@ -1148,6 +1148,7 @@ sub verify_bootdev {
 
 sub print_bootorder {
     my ($devs) = @_;
+    return "" if !@$devs;
     my $data = { order => join(';', @$devs) };
     return PVE::JSONSchema::print_property_string($data, $boot_fmt);
 }
-- 
2.20.1



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