classes/buildhistory: write out task signatures on every build

If we want to determine what changed since the last build, one angle
from which to look at it is to check the signatures. However, if we
don't actually have the signatures from the last build we don't have
anywhere to start. Save the signatures on each build in order to give us
the starting point.

NOTE: you need to set your BUILDHISTORY_FEATURES value to include
"task" to enable collection of these signatures as it is is disabled by
default.

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

1 files changed, 12 insertions, 0 deletions

diff --git a/meta/classes/buildhistory.bbclass b/meta/classes/buildhistory.bbclass
index eea1e72a28..4fc19a0fc2 100644
--- a/meta/classes/buildhistory.bbclass
+++ b/meta/classes/buildhistory.bbclass
@@ -600,6 +600,17 @@ POPULATE_SDK_POST_HOST_COMMAND[vardepvalueexclude] .= "| buildhistory_list_insta
 SDK_POSTPROCESS_COMMAND_append = " buildhistory_get_sdkinfo ; buildhistory_get_extra_sdkinfo; "
 SDK_POSTPROCESS_COMMAND[vardepvalueexclude] .= "| buildhistory_get_sdkinfo ; buildhistory_get_extra_sdkinfo; "
 
+python buildhistory_write_sigs() {
+    if not "task" in (d.getVar('BUILDHISTORY_FEATURES') or "").split():
+        return
+
+    # Create sigs file
+    if hasattr(bb.parse.siggen, 'dump_siglist'):
+        taskoutdir = os.path.join(d.getVar('BUILDHISTORY_DIR'), 'task')
+        bb.utils.mkdirhier(taskoutdir)
+        bb.parse.siggen.dump_siglist(os.path.join(taskoutdir, 'tasksigs.txt'))
+}
+
 def buildhistory_get_build_id(d):
     if d.getVar('BB_WORKERCONTEXT') != '1':
         return ""
@@ -765,6 +776,7 @@ python buildhistory_eventhandler() {
                 shutil.rmtree(olddir)
             if e.data.getVar("BUILDHISTORY_COMMIT") == "1":
                 bb.note("Writing buildhistory")
+                bb.build.exec_func("buildhistory_write_sigs", d)
                 localdata = bb.data.createCopy(e.data)
                 localdata.setVar('BUILDHISTORY_BUILD_FAILURES', str(e._failures))
                 interrupted = getattr(e, '_interrupted', 0)