[gnome-continuous-yocto/gnomeostree-3.28-rocko: 6360/8267] externalsrc: verify that EXTERNALSRC/EXTERNALSRC_BUILD are absolute paths

[Emmanuele Bassi <ebassi src gnome org>]

commit 4de6b898432fc1198a943b32d455e255bde2301b
Author: Ross Burton <ross burton intel com>
Date:   Tue Jun 13 17:44:54 2017 +0100

    externalsrc: verify that EXTERNALSRC/EXTERNALSRC_BUILD are absolute paths
    
    If these are set to URLs then the errors produced are not helpful.
    
    (From OE-Core rev: 946b6623154e748a0d75ff498802a720aeec27a6)
    
    Signed-off-by: Ross Burton <ross burton intel com>
    Signed-off-by: Richard Purdie <richard purdie linuxfoundation org>

 meta/classes/externalsrc.bbclass |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)
---
diff --git a/meta/classes/externalsrc.bbclass b/meta/classes/externalsrc.bbclass
index d64af6a..529be49 100644
--- a/meta/classes/externalsrc.bbclass
+++ b/meta/classes/externalsrc.bbclass
@@ -29,6 +29,12 @@ EXTERNALSRC_SYMLINKS ?= "oe-workdir:${WORKDIR} oe-logs:${T}"
 
 python () {
     externalsrc = d.getVar('EXTERNALSRC')
+    externalsrcbuild = d.getVar('EXTERNALSRC_BUILD')
+
+    if externalsrc and not externalsrc.startswith("/"):
+        bb.error("EXTERNALSRC must be an absolute path")
+    if externalsrcbuild and not externalsrcbuild.startswith("/"):
+        bb.error("EXTERNALSRC_BUILD must be an absolute path")
 
     # If this is the base recipe and EXTERNALSRC is set for it or any of its
     # derivatives, then enable BB_DONT_CACHE to force the recipe to always be
@@ -48,7 +54,6 @@ python () {
 
     if externalsrc:
         d.setVar('S', externalsrc)
-        externalsrcbuild = d.getVar('EXTERNALSRC_BUILD')
         if externalsrcbuild:
             d.setVar('B', externalsrcbuild)
         else: