[kernel] Use better checking for backfilling kernel dependencies

When there are multiple providers of virtual/kernel, we were adding tasks for
each one, which causes problems because of the way PREFERRED_PROVIDER is
resolved -- it seems that when that's done, it 'disappears' all other
providers of virtual/kernel, causing an error about a missing provider of
e.g. 'linux-fslc-imx'.

This change fixes that by explicitly checking the PN against the value of
PREFERRED_PROVIDER_virtual/kernel (or first: against a new variable
'VIGILES_KERNEL_PN', which can be used to specify the kernel config to
use for checking in the event there are 2 kernels built and the desired
one is not set to PREFERRED_PROVIDER for some reason).

The dependencies are added only in that case, instead of blindly adding
them for all providers of 'virtual/kernel'.

classes/vigiles.bbclass

@@ -183,7 +183,6 @@ def vigiles_write_manifest(d, tdw_tag, dict_out):
 # their respective do_vigiles_pkg() tasks.
 ##
 VIGILES_PREFERRED_BACKFILL = "\
-    virtual/kernel \
     virtual/libc \
 "
 
@@ -332,6 +331,11 @@ def vigiles_image_collect(d):
     if boot_pn:
         backfill_list.append(boot_pn)
 
+    kernel_pn = d.getVar('VIGILES_KERNEL_PN') or \
+        d.getVar('PREFERRED_PROVIDER_virtual/kernel') or ''
+    if kernel_pn:
+        backfill_list.append(kernel_pn)
+
     initramfs_image = d.getVar('INITRAMFS_IMAGE', True)
     if initramfs_image:
         backfill_list.append(initramfs_image)
@@ -393,10 +397,15 @@ def vigiles_image_depends(d):
         if boot_pn:
             deps.append('%s:do_vigiles_uboot_config' % boot_pn)
 
+        kernel_pn = d.getVar('VIGILES_KERNEL_PN') or \
+            d.getVar('PREFERRED_PROVIDER_virtual/kernel') or ''
+        if kernel_pn:
+            deps.append('%s:do_vigiles_kconfig' % kernel_pn)
+            deps.append('%s:do_vigiles_pkg' % kernel_pn)
+
     return ' '.join(deps)
 
 
-do_vigiles_image[depends] += "virtual/kernel:do_vigiles_kconfig"
 do_vigiles_image[depends] += " ${@vigiles_image_depends(d)} "
 
 
@@ -463,9 +472,17 @@ python do_vigiles_kconfig() {
 }
 
 
-do_vigiles_kconfig[depends] += "virtual/kernel:do_configure"
+python() {
+
+    pn = d.getVar('PN')
+    kernel_pn = d.getVar('VIGILES_KERNEL_PN') or \
+        d.getVar('PREFERRED_PROVIDER_virtual/kernel') or ''
+
+    if pn == kernel_pn:
+        bb.build.addtask('do_vigiles_kconfig', 'do_savedefconfig', 'do_configure', d)
+        d.appendVarFlag('do_vigiles_kconfig', 'depends', ' %s:do_configure' % pn)
+}
 
-addtask do_vigiles_kconfig after do_configure before do_savedefconfig
 do_vigiles_kconfig[nostamp] = "1"
 
 

conf/vigiles.conf

@@ -32,6 +32,7 @@ VIGILES_KERNEL_CONFIG ??= "auto"
 VIGILES_UBOOT_CONFIG ??= "auto"
 
 VIGILES_UBOOT_PN ??= "${@d.getVar('PREFERRED_PROVIDER_virtual/bootloader') or ''}"
+VIGILES_KERNEL_PN ??= "${@d.getVar('PREFERRED_PROVIDER_virtual/kernel') or ''}"
 
 # This list can include recipe names (PN) or specific CVE IDs that should *not*
 # be included in CVE Reports and notifications.