[OE-core] core-image-tiny-initramfs failing to parse because of WIC (WKS_FULL_PATH, )

[Martin Jansa]

Running e.g. bitbake -e busybox with latest oe-core triggers this badly
looking exception:

Can we add some weak assignment for people who don't care about wic
or core-image-tiny-initramfs to continue using oe-core?

ERROR: ExpansionError during parsing /OE/oe-core/meta/recipes-core/images/
core-image-tiny-initramfs.bb
Traceback (most recent call last):
  File "/OE/bitbake/lib/bb/data_smart.py", line 412, in
DataSmart.expandWithRefs(s='\tout="${IMGDEPLOYDIR}/${IMAGE_NAME}"\n\twks="${WKS_FULL_PATH}"\n\tif
[ -z "$wks" ]; then\n\t\tbbfatal "No kickstart files from WKS_FILES were
found: ${WKS_FILES}. Please set WKS_FILE or WKS_FILES
appropriately."\n\tfi\n\n\tBUILDDIR="${TOPDIR}" wic create "$wks" --vars
"${STAGING_DIR}/${MACHINE}/imgdata/" -e "${IMAGE_BASENAME}" -o "$out/"
${WIC_CREATE_EXTRA_ARGS}\n\tmv "$out/$(basename "${wks%.wks}")"*.direct
"$out${IMAGE_NAME_SUFFIX}.wic"\n\trm -rf "$out/"\n', varname='IMAGE_CMD'):
                 try:
    >                s = __expand_var_regexp__.sub(varparse.var_sub, s)
                     try:
  File "/OE/bitbake/lib/bb/data_smart.py", line 111, in
VariableParse.var_sub(match=<_sre.SRE_Match object; span=(43, 59),
match='${WKS_FULL_PATH}'>):
                 else:
    >                var = self.d.getVarFlag(key, "_content")
                 self.references.add(key)
  File "/OE/bitbake/lib/bb/data_smart.py", line 773, in
DataSmart.getVarFlag(var='WKS_FULL_PATH', flag='_content', expand=True,
noweakdefault=False, parsing=False):
                     cachename = var + "[" + flag + "]"
    >            value = self.expand(value, cachename)

  File "/OE/bitbake/lib/bb/data_smart.py", line 436, in
DataSmart.expand(s="${@wks_search('${WKS_FILES}'.split(),
'${WKS_SEARCH_PATH}') or ''}", varname='WKS_FULL_PATH'):
         def expand(self, s, varname = None):
    >        return self.expandWithRefs(s, varname).value

  File "/OE/bitbake/lib/bb/data_smart.py", line 426, in
DataSmart.expandWithRefs(s="${@wks_search('directdisk.wks
core-image-tiny-initramfs.wks'.split(),
'/OE/oe-core/meta/recipes-core/images:${@':'.join('%s/wic' % p for p in
'/OE:${TMPDIR}:/OE/oe-core/meta'.split(':'))}:${@':'.join('%s/scripts/lib/wic/canned-wks'
% l for l in '/OE:${TMPDIR}:/OE/oe-core/meta:/OE/oe-core'.split(':'))}') or
''}", varname='WKS_FULL_PATH'):
                 except Exception as exc:
    >                raise ExpansionError(varname, s, exc) from exc

bb.data_smart.ExpansionError: Failure expanding variable WKS_FULL_PATH,
expression was ${@wks_search('directdisk.wks
core-image-tiny-initramfs.wks'.split(),
'/OE/oe-core/meta/recipes-core/images:${@':'.join('%s/wic' % p for p in
'/OE:${TMPDIR}:/OE/oe-core/meta'.split(':'))}:${@':'.join('%s/scripts/lib/wic/canned-wks'
% l for l in '/OE:${TMPDIR}:/OE/oe-core/meta:/OE/oe-core'.split(':'))}') or
''} which triggered exception SyntaxError: invalid syntax (WKS_FULL_PATH,
line 1)
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