buildhistory: Simplify intercept call sites and drop SSTATEPOSTINSTFUNC usage

We planned to drop SSTATEPOSTINSTFUNC some time ago with the introduction of
postfuncs. Finally get around to doing that which should make the buildhistory
code a little more readable.

Unfortunately ordering the buildhistory function calls after the sstate ones is
difficult without coding that into the sstate class. This patch does that to
ensure everything functions as expected until we can find a better way. This is
still likely preferable than the generic sstate postfuncs support since the function
flow is much more readable.

(From OE-Core rev: 78ca086441b21dedd9c471a3d3200c24fd9ec8d2)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit c9e2a8fa2f0305ef1247ec405555612326f798f8)
Signed-off-by: Steve Sakoman <steve@sakoman.com>

meta/classes/buildhistory.bbclass

@@ -45,11 +45,18 @@ BUILDHISTORY_PUSH_REPO ?= ""
 BUILDHISTORY_TAG ?= "build"
 BUILDHISTORY_PATH_PREFIX_STRIP ?= ""
 
-SSTATEPOSTINSTFUNCS:append = " buildhistory_emit_pkghistory"
-# We want to avoid influencing the signatures of sstate tasks - first the function itself:
-sstate_install[vardepsexclude] += "buildhistory_emit_pkghistory"
-# then the value added to SSTATEPOSTINSTFUNCS:
-SSTATEPOSTINSTFUNCS[vardepvalueexclude] .= "| buildhistory_emit_pkghistory"
+# We want to avoid influencing the signatures of the task so use vardepsexclude
+do_populate_sysroot[postfuncs] += "buildhistory_emit_sysroot"
+do_populate_sysroot_setscene[postfuncs] += "buildhistory_emit_sysroot"
+do_populate_sysroot[vardepsexclude] += "buildhistory_emit_sysroot"
+
+do_package[postfuncs] += "buildhistory_list_pkg_files"
+do_package_setscene[postfuncs] += "buildhistory_list_pkg_files"
+do_package[vardepsexclude] += "buildhistory_list_pkg_files"
+
+do_packagedata[postfuncs] += "buildhistory_emit_pkghistory"
+do_packagedata_setscene[postfuncs] += "buildhistory_emit_pkghistory"
+do_packagedata[vardepsexclude] += "buildhistory_emit_pkghistory"
 
 # Similarly for our function that gets the output signatures
 SSTATEPOSTUNPACKFUNCS:append = " buildhistory_emit_outputsigs"
@@ -89,27 +96,15 @@ buildhistory_emit_sysroot() {
 # Write out metadata about this package for comparison when writing future packages
 #
 python buildhistory_emit_pkghistory() {
-    if d.getVar('BB_CURRENTTASK') in ['populate_sysroot', 'populate_sysroot_setscene']:
-        bb.build.exec_func("buildhistory_emit_sysroot", d)
-        return 0
-
-    if not "package" in (d.getVar('BUILDHISTORY_FEATURES') or "").split():
-        return 0
-
-    if d.getVar('BB_CURRENTTASK') in ['package', 'package_setscene']:
-        # Create files-in-<package-name>.txt files containing a list of files of each recipe's package
-        bb.build.exec_func("buildhistory_list_pkg_files", d)
-        return 0
-
-    if not d.getVar('BB_CURRENTTASK') in ['packagedata', 'packagedata_setscene']:
-        return 0
-
     import re
     import json
     import shlex
     import errno
     import shutil
 
+    if not "package" in (d.getVar('BUILDHISTORY_FEATURES') or "").split():
+        return 0
+
     pkghistdir = d.getVar('BUILDHISTORY_DIR_PACKAGE')
     oldpkghistdir = d.getVar('BUILDHISTORY_OLD_DIR_PACKAGE')
 
@@ -619,6 +614,10 @@ buildhistory_list_files_no_owners() {
 }
 
 buildhistory_list_pkg_files() {
+	if [ "${@bb.utils.contains('BUILDHISTORY_FEATURES', 'package', '1', '0', d)}" = "0" ] ; then
+		return
+	fi
+
 	# Create individual files-in-package for each recipe's package
 	pkgdirlist=$(find ${PKGDEST}/* -maxdepth 0 -type d)
 	for pkgdir in $pkgdirlist; do

meta/classes/sstate.bbclass

@@ -156,7 +156,10 @@ python () {
     d.setVar('SSTATETASKS', " ".join(unique_tasks))
     for task in unique_tasks:
         d.prependVarFlag(task, 'prefuncs', "sstate_task_prefunc ")
-        d.appendVarFlag(task, 'postfuncs', " sstate_task_postfunc")
+        # Generally sstate should be last, execpt for buildhistory functions
+        postfuncs = (d.getVarFlag(task, 'postfuncs') or "").split()
+        newpostfuncs = [p for p in postfuncs if "buildhistory" not in p] + ["sstate_task_postfunc"] + [p for p in postfuncs if "buildhistory" in p]
+        d.setVarFlag(task, 'postfuncs', " ".join(newpostfuncs))
         d.setVarFlag(task, 'network', '1')
         d.setVarFlag(task + "_setscene", 'network', '1')
 }