classes/externalsrc: add workaround for recipes that use SRCPV in PV

Here we set SRC_URI to blank, however doing so means that the function
that is called when you expand the default value of SRCPV
(i.e. bb.fetch2.get_srcrev()) will fail, so any recipe that references
SRCPV in PV couldn't previously be used with externalsrc.

(At some point we may fix the function to work in the externalsrc case,
but then we would also need to ensure that ${B} did not change as a
result of PV changing any time the HEAD revision changes in the external
source tree, or you'll lose any intermediate build artifacts.)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

diff --git a/meta/classes/externalsrc.bbclass b/meta/classes/externalsrc.bbclass
index e37239280143e35100ebedc843d1bf99da9a8ce8..234bd8dedd529324b6c1ab1a8e587e4d63e2da51 100644 (file)
--- a/meta/classes/externalsrc.bbclass
+++ b/meta/classes/externalsrc.bbclass
@@ -37,6 +37,10 @@ python () {
             d.setVar('B', '${WORKDIR}/${BPN}-${PV}/')
         d.setVar('SRC_URI', '')
 
+        if '{SRCPV}' in d.getVar('PV', False):
+            # Dummy value because the default function can't be called with blank SRC_URI
+            d.setVar('SRCPV', '999')
+
         tasks = filter(lambda k: d.getVarFlag(k, "task"), d.keys())
 
         for task in tasks: