[OE-core] [PATCH] Allow overriding environment specific SPDX variables

[niko.mauno at vaisala.com]

Change certain variable assignments from 'hard' (=) to 'soft' (?=) so that
suitable permutations of values for these variables can be assigned eg. in
custom meta layers. Otherwise eg. fossology server is limited to run on same
machine as bitbake, and generated SPDX files are placed into home directory
path of a custom luser account.

Signed-off-by: Niko Mauno <niko.mauno at vaisala.com>
---
 meta/conf/licenses.conf | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/meta/conf/licenses.conf b/meta/conf/licenses.conf
index d210a0e..fcaec1b 100644
--- a/meta/conf/licenses.conf
+++ b/meta/conf/licenses.conf
@@ -123,7 +123,9 @@ SPDXLICENSEMAP[SGIv1] = "SGI-1"
 
 ## SPDX temporary directory
 SPDX_TEMP_DIR = "${WORKDIR}/spdx_temp"
-SPDX_MANIFEST_DIR = "/home/yocto/fossology_scans"
+
+## Output directory for generated SPDX files
+SPDX_MANIFEST_DIR ?= "/home/yocto/fossology_scans"
 
 ## SPDX Format info
 SPDX_VERSION = "SPDX-1.1"
@@ -142,7 +144,7 @@ DATA_LICENSE = "CC0-1.0"
 #   information.
 #
 
-FOSS_NO_COPYRIGHT = "true"
+FOSS_NO_COPYRIGHT ?= "true"
 
 # A option defined as[FOSS_RECURSIVE_UNPACK] in ./meta/conf/licenses.conf. is
 # used to control if FOSSology server need recursively unpack tar.gz file which
@@ -156,7 +158,7 @@ FOSS_NO_COPYRIGHT = "true"
 #    FOSSology server recursively unpack components.
 #
 
-FOSS_RECURSIVE_UNPACK = "false"
+FOSS_RECURSIVE_UNPACK ?= "false"
 
 # An option defined as [FOSS_FULL_SPDX] in ./meta/conf/licenses.conf is used to
 # control what kind of SPDX output to get from the FOSSology server.
@@ -171,7 +173,7 @@ FOSS_RECURSIVE_UNPACK = "false"
 #   license tags in the report will be "NOASSERTION"
 #
 
-FOSS_FULL_SPDX = "true"
+FOSS_FULL_SPDX ?= "true"
 
 # FOSSologySPDX instance server. http://localhost/repo is the default
 # installation location for FOSSology.
@@ -180,7 +182,7 @@ FOSS_FULL_SPDX = "true"
 #   https://github.com/spdx-tools/fossology-spdx/wiki/Fossology-SPDX-Web-API
 #
 
-FOSS_BASE_URL = "http://localhost/repo/?mod=spdx_license_once"
+FOSS_BASE_URL ?= "http://localhost/repo/?mod=spdx_license_once"
 FOSS_SERVER = "${FOSS_BASE_URL}&fullSPDXFlag=${FOSS_FULL_SPDX}&noCopyright=${FOSS_NO_COPYRIGHT}&recursiveUnpack=${FOSS_RECURSIVE_UNPACK}"
 
 FOSS_WGET_FLAGS = "-qO - --no-check-certificate --timeout=0"
-- 
2.1.4