templates: Fix bad test on GRUB_DISABLE_SUBMENU

The GRUB_DISABLE_SUBMENU option is different than the others in the sense
that it has to be set to "y" instead of "true" to be enabled.

That causes a lot of confusion to users, some may wrongly set it to "true"
expecting that will work the same than with most options, and some may set
it to "yes" since for other options the value to set is a word and not a
single character.

This patch changes all the grub.d scripts using the GRUB_DISABLE_SUBMENU
option, so they check if it was set to "true" instead of "y", making it
consistent with all the other options.

But to keep backward compatibility for users that set the option to "y" in
/etc/default/grub file, keep testing for this value. And also do it for
"yes", since it is a common mistake made by users caused by this option
being inconsistent with the others.

Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

docs/grub.texi

@@ -1495,7 +1495,7 @@ Normally, @command{grub-mkconfig} will generate top level menu entry for
 the kernel with highest version number and put all other found kernels
 or alternative menu entries for recovery mode in submenu. For entries returned
 by @command{os-prober} first entry will be put on top level and all others
-in submenu. If this option is set to @samp{y}, flat menu with all entries
+in submenu. If this option is set to @samp{true}, flat menu with all entries
 on top level will be generated instead. Changing this option will require
 changing existing values of @samp{GRUB_DEFAULT}, @samp{fallback} (@pxref{fallback})
 and @samp{default} (@pxref{default}) environment variables as well as saved

util/grub.d/10_hurd.in

@@ -156,7 +156,15 @@ is_top_level=true
 while [ "x$kernels" != "x" ] ; do
   kernel=`version_find_latest $kernels`
 
-  if [ "x$is_top_level" = xtrue ] && [ "x${GRUB_DISABLE_SUBMENU}" != xy ]; then
+  # The GRUB_DISABLE_SUBMENU option used to be different than others since it was
+  # mentioned in the documentation that has to be set to 'y' instead of 'true' to
+  # enable it. This caused a lot of confusion to users that set the option to 'y',
+  # 'yes' or 'true'. This was fixed but all of these values must be supported now.
+  if [ "x${GRUB_DISABLE_SUBMENU}" = xyes ] || [ "x${GRUB_DISABLE_SUBMENU}" = xy ]; then
+      GRUB_DISABLE_SUBMENU="true"
+  fi
+
+  if [ "x$is_top_level" = xtrue ] && [ "x${GRUB_DISABLE_SUBMENU}" != xtrue ]; then
       hurd_entry "$kernel" simple
       submenu_indentation="$grub_tab"
     

util/grub.d/10_kfreebsd.in

@@ -214,7 +214,15 @@ while [ "x$list" != "x" ] ; do
     module_dir_rel=$(make_system_path_relative_to_its_root $module_dir)
   fi
 
-  if [ "x$is_top_level" = xtrue ] && [ "x${GRUB_DISABLE_SUBMENU}" != xy ]; then
+  # The GRUB_DISABLE_SUBMENU option used to be different than others since it was
+  # mentioned in the documentation that has to be set to 'y' instead of 'true' to
+  # enable it. This caused a lot of confusion to users that set the option to 'y',
+  # 'yes' or 'true'. This was fixed but all of these values must be supported now.
+  if [ "x${GRUB_DISABLE_SUBMENU}" = xyes ] || [ "x${GRUB_DISABLE_SUBMENU}" = xy ]; then
+      GRUB_DISABLE_SUBMENU="true"
+  fi
+
+  if [ "x$is_top_level" = xtrue ] && [ "x${GRUB_DISABLE_SUBMENU}" != xtrue ]; then
       kfreebsd_entry "${OS}" "${version}" simple
       submenu_indentation="$grub_tab"
     

util/grub.d/10_linux.in

@@ -261,7 +261,15 @@ while [ "x$list" != "x" ] ; do
     fi
   fi
 
-  if [ "x$is_top_level" = xtrue ] && [ "x${GRUB_DISABLE_SUBMENU}" != xy ]; then
+  # The GRUB_DISABLE_SUBMENU option used to be different than others since it was
+  # mentioned in the documentation that has to be set to 'y' instead of 'true' to
+  # enable it. This caused a lot of confusion to users that set the option to 'y',
+  # 'yes' or 'true'. This was fixed but all of these values must be supported now.
+  if [ "x${GRUB_DISABLE_SUBMENU}" = xyes ] || [ "x${GRUB_DISABLE_SUBMENU}" = xy ]; then
+    GRUB_DISABLE_SUBMENU="true"
+  fi
+
+  if [ "x$is_top_level" = xtrue ] && [ "x${GRUB_DISABLE_SUBMENU}" != xtrue ]; then
     linux_entry "${OS}" "${version}" simple \
     "${GRUB_CMDLINE_LINUX} ${GRUB_CMDLINE_LINUX_DEFAULT}"
 

util/grub.d/10_netbsd.in

@@ -157,7 +157,15 @@ for k in /netbsd $(ls -t /netbsd?* 2>/dev/null) ; do
 
   gettext_printf "Found NetBSD kernel: %s\n" "$k" >&2
 
-  if [ "x$is_top_level" = xtrue ] && [ "x${GRUB_DISABLE_SUBMENU}" != xy ]; then
+  # The GRUB_DISABLE_SUBMENU option used to be different than others since it was
+  # mentioned in the documentation that has to be set to 'y' instead of 'true' to
+  # enable it. This caused a lot of confusion to users that set the option to 'y',
+  # 'yes' or 'true'. This was fixed but all of these values must be supported now.
+  if [ "x${GRUB_DISABLE_SUBMENU}" = xyes ] || [ "x${GRUB_DISABLE_SUBMENU}" = xy ]; then
+    GRUB_DISABLE_SUBMENU="true"
+  fi
+
+  if [ "x$is_top_level" = xtrue ] && [ "x${GRUB_DISABLE_SUBMENU}" != xtrue ]; then
       netbsd_entry "knetbsd"   "$k" simple "${GRUB_CMDLINE_NETBSD_DEFAULT}"
     submenu_indentation="$grub_tab"
     

util/grub.d/20_linux_xen.in

@@ -288,7 +288,15 @@ while [ "x${xen_list}" != "x" ] ; do
 	    fi
 	fi
 
-	if [ "x$is_top_level" = xtrue ] && [ "x${GRUB_DISABLE_SUBMENU}" != xy ]; then
+	# The GRUB_DISABLE_SUBMENU option used to be different than others since it was
+	# mentioned in the documentation that has to be set to 'y' instead of 'true' to
+	# enable it. This caused a lot of confusion to users that set the option to 'y',
+	# 'yes' or 'true'. This was fixed but all of these values must be supported now.
+	if [ "x${GRUB_DISABLE_SUBMENU}" = xyes ] || [ "x${GRUB_DISABLE_SUBMENU}" = xy ]; then
+	    GRUB_DISABLE_SUBMENU="true"
+	fi
+
+	if [ "x$is_top_level" = xtrue ] && [ "x${GRUB_DISABLE_SUBMENU}" != xtrue ]; then
 	    linux_entry "${OS}" "${version}" "${xen_version}" simple \
 		"${GRUB_CMDLINE_LINUX} ${GRUB_CMDLINE_LINUX_DEFAULT}" "${GRUB_CMDLINE_XEN} ${GRUB_CMDLINE_XEN_DEFAULT}"
 

util/grub.d/30_os-prober.in

@@ -234,7 +234,15 @@ EOF
 	  prepare_boot_cache="$(prepare_grub_to_access_device ${LBOOT} | grub_add_tab)"
 	fi
 
-	if [ "x$is_top_level" = xtrue ] && [ "x${GRUB_DISABLE_SUBMENU}" != xy ]; then
+	# The GRUB_DISABLE_SUBMENU option used to be different than others since it was
+	# mentioned in the documentation that has to be set to 'y' instead of 'true' to
+	# enable it. This caused a lot of confusion to users that set the option to 'y',
+	# 'yes' or 'true'. This was fixed but all of these values must be supported now.
+	if [ "x${GRUB_DISABLE_SUBMENU}" = xyes ] || [ "x${GRUB_DISABLE_SUBMENU}" = xy ]; then
+	    GRUB_DISABLE_SUBMENU="true"
+	fi
+
+	if [ "x$is_top_level" = xtrue ] && [ "x${GRUB_DISABLE_SUBMENU}" != xtrue ]; then
             cat << EOF
 menuentry '$(echo "$OS $onstr" | grub_quote)' $CLASS --class gnu-linux --class gnu --class os \$menuentry_id_option 'osprober-gnulinux-simple-$boot_device_id' {
 EOF