Source: xen Severity: normal Version: 4.14.1+11-gb0b734a8b3-1 I noticed that installing xen-system-amd64 does not always lead to a grub configuration that will boot into the xen hypervisor. As a quick fix "update-grub" can be run manually after installation of xen-system-amd64 to generate the proper grub configuration.
The issue leading to this is the following: * xen-system-amd6 depends on xen-hypervisor-4.14-amd64, xen-hypervisor-common and xen-utils-4.14. * xen-hypervisor-4.14-amd64 recommends xen-hypervisor-common and xen- utils-4.14. xen-hypervisor-common ships the conffile /etc/default/grub.d/xen.cfg which configures grub to boot into the xen hypervisor. xen-hypervisor-4.14-amd64 has a postinst maintainer script which calls "update-grub". The problem is that because xen-hypervisor-common is only a recommendation of xen-hypervisor-4.14-amd64 it may not be configured when the postinst script of xen-hypervisor-4.14-amd64 is run and within it update-grub is called. When xen-hypervisor-common gets installed it first creates the file "/etc/ default/grub.d/xen.cfg.dpkg-new". Only after it gets configured the final file will be "/etc/default/grub.d/xen.cfg" So when the update-grub command gets called the grub configuration file does not end in ".cfg" and this is ignored by update-grub. I see the following possibilities to fix this: * make xen-hypervisor-common a dependency of xen-hypervisor-4.14-amd64 which then should make sure xen-hypervisor-common is configures before the postinst script in xen-hypervisor-4.14-amd64 run. Of course this makes it no longer possible to install xen-hypervisor-4.14-amd64 without xen-hypervisor-common. * Additionally run "update-grub" in the postinst maintainer script of xen- hypervisor-common. This makes sens as the package ships a grub configuration file and if something changes there then update-grub should be called. I also think that if xen-hypervisor-4.14-amd64 is already installed and xen- hypervisor-common only gets installed later, update-grub currently is never run (I didn't verify this) and this change would also fix this. The only downside I can see is that update-grub will be called twice if xen- hypervisor-4.14-amd64 and xen-hypervisor-common get installed together. Maybe this is not really an issue as update-grub usually should be quite fast. I think the second option seems reasonable, but maybe someone else has a better idea how to fix this issue. Thanks Maxi
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