Re: [PATCH 1/2] Fix util/grub.d/20_linux_xen.in: Add xen_boot command support for aarch64

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

On Mon, Aug 28, 2017 at 02:40:14PM -0400, Konrad Rzeszutek Wilk wrote:
> Commit d33045ce7ffcb7c1e4a60c14d5ca64b36e3c5abe introduced
> the support for this, but it does not work under x86 (as it stops
> 20_linux_xen from running).
> 
> The 20_linux_xen is run under a shell and any exits from within it:
> 
> (For example on x86):
> + /usr/bin/grub2-file --is-arm64-efi /boot/xen-4.9.0.gz
> [root@tst063 grub]# echo $?
> 1
> 
> will result in 20_linux_xen exciting without continuing
> and also causing grub2-mkconfig to stop processing.
> 
> As in:

git format-patch decided to eat this relevant part:

[root@tst063 grub]# ./grub-mkconfig | tail
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-4.13.0-0.rc5.git1.1.fc27.x86_64
Found initrd image: /boot/initramfs-4.13.0-0.rc5.git1.1.fc27.x86_64.img
Found linux image: /boot/vmlinuz-0-rescue-ec082ee24aea41b9b16aca52a6d10cc2
Found initrd image: /boot/initramfs-0-rescue-ec082ee24aea41b9b16aca52a6d10cc2.img
		echo	'Loading Linux 0-rescue-ec082ee24aea41b9b16aca52a6d10cc2 ...'
		linux	/vmlinuz-0-rescue-ec082ee24aea41b9b16aca52a6d10cc2 root=/dev/mapper/fedora_tst063-root ro single 
		echo	'Loading initial ramdisk ...'
		initrd	/initramfs-0-rescue-ec082ee24aea41b9b16aca52a6d10cc2.img
	}
}

### END /usr/local/etc/grub.d/10_linux ###

### BEGIN /usr/local/etc/grub.d/20_linux_xen ###

root@tst063 grub]# 

> 
> [root@tst063 ~]#
> 
> And no more.
> 
> This patch wraps the invocation of grub-file to be a in subshell
> and to process the return value in a conditional. That fixes
> the issue.
> 
> RH-BZ 1486002: grub2-mkconfig does not work if xen.gz is installed.
> CC: Fu Wei <fu.wei@linaro.org>
> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> ---
>  util/grub.d/20_linux_xen.in | 9 ++++-----
>  1 file changed, 4 insertions(+), 5 deletions(-)
> 
> diff --git a/util/grub.d/20_linux_xen.in b/util/grub.d/20_linux_xen.in
> index c002fc9..083bcef 100644
> --- a/util/grub.d/20_linux_xen.in
> +++ b/util/grub.d/20_linux_xen.in
> @@ -206,13 +206,12 @@ while [ "x${xen_list}" != "x" ] ; do
>      if [ "x$is_top_level" != xtrue ]; then
>  	echo "	submenu '$(gettext_printf "Xen hypervisor, version %s" "${xen_version}" | grub_quote)' \$menuentry_id_option 'xen-hypervisor-$xen_version-$boot_device_id' {"
>      fi
> -    $grub_file --is-arm64-efi $current_xen
> -    if [ $? -ne 0 ]; then
> -	xen_loader="multiboot"
> -	module_loader="module"
> -    else
> +    if ($grub_file --is-arm64-efi $current_xen); then
>  	xen_loader="xen_hypervisor"
>  	module_loader="xen_module"
> +    else
> +	xen_loader="multiboot"
> +	module_loader="module"
>      fi
>      while [ "x$list" != "x" ] ; do
>  	linux=`version_find_latest $list`
> -- 
> 2.1.4
>