grubby-bls: make --update-kernel ALL to update kernelopts var in grubenv

Currently there's no way to update the kernelopts variable defined in the
grubenv by using the grubby wrapper. Updating it with grub2-editenv - set
is tedious and error prone so let's use --update-kernel=ALL option for it.

This command currently iterates over all the BLS entries and update them
individually, but makes more sense to update the kernelopts grubenv var
and only update the BLS entries that don't have the $kernelopts var in
their options field.

If after an update one of these BLS entries have exactly the same params
in their options field than the ones set in $kernelopts, set the options
field to $kernelopts again since the parameters have converged again.

That way the modified BLS entries will only have a custom options field
while its value diverged from the $kernelopts defined in grubenv.

Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>

grubby-bls

@@ -218,8 +218,20 @@ expand_var() {
     echo $var
 }
 
+has_kernelopts()
+{
+    local args=${bls_options[$1]}
+    local opts=(${args})
+
+    for opt in ${opts[*]}; do
+        [[ $opt = "\$kernelopts" ]] && return 0
+    done
+
+    return 1
+}
+
 get_bls_args() {
-    local args=${bls_options[$i]}
+    local args=${bls_options[$1]}
     local opts=(${args})
 
     for opt in ${opts[*]}; do
@@ -473,16 +485,32 @@ update_bls_fragment() {
     local remove_args=$1 && shift
     local add_args=$1 && shift
     local initrd=$1 && shift
+    local opts
 
     if [[ $indexes = "-1" ]]; then
         print_error "The param $(get_prefix)${param} is incorrect"
     fi
 
+    if [[ $param = "ALL" && $bootloader = grub2 ]] && [[ -n $remove_args || -n $add_args ]]; then
+        local old_args="$(grub2-editenv "${env}" list | grep kernelopts | sed -e "s/kernelopts=//")"
+        opts="$(update_args "${old_args}" "${remove_args}" "${add_args}")"
+        grub2-editenv "${env}" set kernelopts="${opts}"
+    elif [[ $bootloader = grub2 ]]; then
+        opts="$(grub2-editenv "${env}" list | grep kernelopts | sed -e "s/kernelopts=//")"
+    fi
+
     for i in ${indexes[*]}; do
 	if [[ -n $remove_args || -n $add_args ]]; then
             local old_args="$(get_bls_args "$i")"
             local new_args="$(update_args "${old_args}" "${remove_args}" "${add_args}")"
-            set_bls_value "${bls_file[$i]}" "options" "${new_args}"
+
+            if [[ $param != "ALL" || ! "$(has_kernelopts "$i")" ]]; then
+                set_bls_value "${bls_file[$i]}" "options" "${new_args}"
+            fi
+
+            if [[ $bootloader = grub2 && ! "$(has_kernelopts "$i")" && $opts = $new_args ]]; then
+                set_bls_value "${bls_file[$i]}" "options" "\$kernelopts"
+            fi
 	fi
 
 	if [[ -n $initrd ]]; then

grubby.spec

@@ -1,6 +1,6 @@
 Name: grubby
 Version: 8.40
-Release: 27%{?dist}
+Release: 28%{?dist}
 Summary: Command line tool for updating bootloader configs
 License: GPLv2+
 URL: https://github.com/rhinstaller/grubby
@@ -132,6 +132,9 @@ current boot environment.
  %{_mandir}/man8/*.8*
 
 %changelog
+* Fri Mar 01 2019 Javier Martinez Canillas <javierm@redhat.com> - 8.40-28
+- grubby-bls: make --update-kernel ALL to update kernelopts var in grubenv
+
 * Thu Feb 14 2019 Javier Martinez Canillas <javierm@redhat.com> - 8.40-27
 - grubby-bls: error if args or remove-args is used without update-kernel