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[Xen-devel] [PATCH v2 1/2] Fix util/grub.d/20_linux_xen.in: Add xen_boot command support for aarch64

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 $?

will result in 20_linux_xen exiting without continuing
and also causing grub2-mkconfig to stop processing.

As in:

 [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: 
                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]#

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@xxxxxxxxxx>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
v1: Initial patch
v2: Add the failing output.
 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' {"
-    $grub_file --is-arm64-efi $current_xen
-    if [ $? -ne 0 ]; then
-       xen_loader="multiboot"
-       module_loader="module"
-    else
+    if ($grub_file --is-arm64-efi $current_xen); then
+    else
+       xen_loader="multiboot"
+       module_loader="module"
     while [ "x$list" != "x" ] ; do
        linux=`version_find_latest $list`

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