wic: Prepare wicboot to allow custom bootloader config

Currently wic does the bootloader configuration file on the fly.
This change introduce a configfile variable for the bootloader;
this is to have a user defined configuration file for the
bootloaders (grub, syslinux, and gummiboot). This is particular
useful when having a multiboot system or scripts embedded in the
configuration file.

[YOCTO #8728]

(From OE-Core rev: 8347aee95ea271921c15ea8e580f0ff62325aa26)

Signed-off-by: Mariano Lopez <mariano.lopez@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/lib/wic/kickstart/__init__.py

@@ -97,6 +97,13 @@ def get_timeout(kickstart, default=None):
         return default
     return int(kickstart.handler.bootloader.timeout)
 
+def get_bootloader_file(kickstart, default=None):
+    if not hasattr(kickstart.handler.bootloader, "configfile"):
+        return default
+    if kickstart.handler.bootloader.configfile is None:
+        return default
+    return kickstart.handler.bootloader.configfile
+
 def get_kernel_args(kickstart, default="ro rd.live.image"):
     if not hasattr(kickstart.handler.bootloader, "appendLine"):
         return default

scripts/lib/wic/kickstart/custom_commands/wicboot.py

@@ -35,6 +35,7 @@ class Wic_Bootloader(F8_Bootloader):
         self.menus = ""
         self.ptable = "msdos"
         self.source = ""
+        self.configfile = ""
 
     def _getArgsAsStr(self):
         retval = F8_Bootloader._getArgsAsStr(self)
@@ -45,6 +46,8 @@ class Wic_Bootloader(F8_Bootloader):
             retval += " --ptable=\"%s\"" %(self.ptable,)
         if self.source:
             retval += " --source=%s" % self.source
+        if self.configfile:
+            retval += " --configfile=%s" % self.configfile
 
         return retval
 
@@ -56,5 +59,7 @@ class Wic_Bootloader(F8_Bootloader):
         # use specified source plugin to implement bootloader-specific methods
         parser.add_option("--source", type="string", action="store",
                       dest="source", default=None)
+        parser.add_option("--configfile", type="string", action="store",
+                      dest="configfile", default=None)
         return parser