[PATCH] Make SSTATE_SCAN_CMD vars configurable using weak defaults.

[Kristian Amlie <kristian.amlie@mender.io>]

For this we move them out of the python section so they can be
overridden on a per-recipe basis.

The motivation for this change is that not all tool chains need the
path modifications provided by the command, and these will provide
alternative or empty commands. The Go compiler is such an example.

Signed-off-by: Kristian Amlie <kristian.amlie@mender.io>
---
 meta/classes/cross.bbclass    | 4 ++++
 meta/classes/crosssdk.bbclass | 4 ++++
 meta/classes/native.bbclass   | 4 ++++
 meta/classes/sstate.bbclass   | 9 ++-------
 4 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/meta/classes/cross.bbclass b/meta/classes/cross.bbclass
index d125f10..4985f89 100644
--- a/meta/classes/cross.bbclass
+++ b/meta/classes/cross.bbclass
@@ -38,6 +38,10 @@ TOOLCHAIN_OPTIONS = ""
 
 DEPENDS_GETTEXT = "gettext-native"
 
+# This class encodes staging paths into its scripts data so can only be
+# reused if we manipulate the paths.
+SSTATE_SCAN_CMD ?= "${SSTATE_SCAN_CMD_NATIVE}"
+
 # Path mangling needed by the cross packaging
 # Note that we use := here to ensure that libdir and includedir are
 # target paths.
diff --git a/meta/classes/crosssdk.bbclass b/meta/classes/crosssdk.bbclass
index c5c29ea..a5ffd97 100644
--- a/meta/classes/crosssdk.bbclass
+++ b/meta/classes/crosssdk.bbclass
@@ -10,6 +10,10 @@ python () {
 
 STAGING_BINDIR_TOOLCHAIN = "${STAGING_DIR_NATIVE}${bindir_native}/${TARGET_ARCH}${TARGET_VENDOR}-${TARGET_OS}"
 
+# This class encodes staging paths into its scripts data so can only be
+# reused if we manipulate the paths.
+SSTATE_SCAN_CMD ?= "${SSTATE_SCAN_CMD_NATIVE}"
+
 TARGET_ARCH = "${SDK_ARCH}"
 TARGET_VENDOR = "${SDK_VENDOR}"
 TARGET_OS = "${SDK_OS}"
diff --git a/meta/classes/native.bbclass b/meta/classes/native.bbclass
index 4d4aaad..ec91fc3 100644
--- a/meta/classes/native.bbclass
+++ b/meta/classes/native.bbclass
@@ -115,6 +115,10 @@ MACHINEOVERRIDES = ""
 
 PATH_prepend = "${COREBASE}/scripts/native-intercept:"
 
+# This class encodes staging paths into its scripts data so can only be
+# reused if we manipulate the paths.
+SSTATE_SCAN_CMD ?= "${SSTATE_SCAN_CMD_NATIVE}"
+
 python native_virtclass_handler () {
     classextend = e.data.getVar('BBCLASSEXTEND') or ""
     if "native" not in classextend:
diff --git a/meta/classes/sstate.bbclass b/meta/classes/sstate.bbclass
index a767a02..5f4ef76 100644
--- a/meta/classes/sstate.bbclass
+++ b/meta/classes/sstate.bbclass
@@ -34,7 +34,8 @@ SSTATE_DUPWHITELIST += "${DEPLOY_DIR_SRC}"
 SSTATE_DUPWHITELIST += "${DEPLOY_DIR}/sdk/README_-_DO_NOT_DELETE_FILES_IN_THIS_DIRECTORY.txt"
 
 SSTATE_SCAN_FILES ?= "*.la *-config *_config"
-SSTATE_SCAN_CMD ?= 'find ${SSTATE_BUILDDIR} \( -name "${@"\" -o -name \"".join(d.getVar("SSTATE_SCAN_FILES").split())}" \) -type f'
+SSTATE_SCAN_CMD ??= 'find ${SSTATE_BUILDDIR} \( -name "${@"\" -o -name \"".join(d.getVar("SSTATE_SCAN_FILES").split())}" \) -type f'
+SSTATE_SCAN_CMD_NATIVE ??= 'grep -Irl -e ${RECIPE_SYSROOT} -e ${RECIPE_SYSROOT_NATIVE} ${SSTATE_BUILDDIR}'
 
 BB_HASHFILENAME = "False ${SSTATE_PKGSPEC} ${SSTATE_SWSPEC}"
 
@@ -94,12 +95,6 @@ python () {
         d.setVar('BB_HASHFILENAME', "True ${SSTATE_PKGSPEC} ${SSTATE_SWSPEC}")
         d.setVar('SSTATE_EXTRAPATHWILDCARD', "*/")
 
-    # These classes encode staging paths into their scripts data so can only be
-    # reused if we manipulate the paths
-    if bb.data.inherits_class('native', d) or bb.data.inherits_class('cross', d) or bb.data.inherits_class('sdk', d) or bb.data.inherits_class('crosssdk', d):
-        scan_cmd = "grep -Irl -e ${RECIPE_SYSROOT} -e ${RECIPE_SYSROOT_NATIVE} ${SSTATE_BUILDDIR}"
-        d.setVar('SSTATE_SCAN_CMD', scan_cmd)
-
     unique_tasks = sorted(set((d.getVar('SSTATETASKS') or "").split()))
     d.setVar('SSTATETASKS', " ".join(unique_tasks))
     for task in unique_tasks:
-- 
2.7.4