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# Copyright (C) 2009 Chris Larson <clarson@kergoth.com>
# Released under the MIT license (see COPYING.MIT for the terms)
#
# This class uses events to capture the state of the datastore when the task
# starts, and after it completes. It diffs those captured states, and emits
# messages showing which variables changed, and what their values were changed
# to.
#
# It provides a mechanism to blacklist variables you expect to change, both
# globally and on a per-task basis.
#
# Known instances of tasks changing metadata:
#
# PSTAGE_PKGMANAGER changes by calls to pstage_set_pkgmanager in:
# do_clean, do_setscene, do_package_stage
#
# Subpackage metadata, read by the pkgdata functions in base.bbclass, in:
# do_package, do_package_stage, do_package_write_*
TASK_METADATA_BLACKLIST = "\
__RUNQUEUE_DO_NOT_USE_EXTERNALLY \
"
#TASK_METADATA_BLACKLIST_do_clean = "\
# PSTAGE_PKGMANAGER \
#"
def dict_diff(olddict, newdict):
diff = {}
for key in set(olddict).union(set(newdict)):
old = olddict.get(key)
new = newdict.get(key)
if old != new:
diff[key] = (old, new)
return diff
def dict_for_data(data):
newdict = {}
for key in data.keys():
newdict[key] = data.getVar(key, False)
return newdict
def task_metadata_track_start(task, data):
originaldata = dict_for_data(data)
data.setVar("__originaldata_%s" % task, originaldata)
def task_metadata_track_stop(task, data):
from bb import note
pf = data.getVar("PF", True)
def emit(msg):
note("%s: %s" % (pf, msg))
originaldata = data.getVar("__originaldata_%s" % task, False)
newdata = dict_for_data(data)
blacklist = data.getVar("TASK_METADATA_BLACKLIST", True).split() + \
(data.getVar("TASK_METADATA_BLACKLIST_%s" % task, True) or "").split()
diff = dict_diff(originaldata, newdata)
diff_clean = [key for key in diff \
if not key in blacklist and \
not key.startswith("__originaldata_")]
if diff_clean:
emit("Variables changed by %s:" % task)
for key in diff_clean:
(old, new) = diff[key]
emit(" %s:" % key)
emit(" '%s' -> '%s'" % (old, new))
python __task_metadata_track_eh () {
from bb.build import TaskStarted, TaskSucceeded
if isinstance(e, TaskStarted):
if e.data is None:
from bb import fatal
fatal("e.data is none for %s" % e)
task_metadata_track_start(e.task, e.data)
elif isinstance(e, TaskSucceeded):
task_metadata_track_stop(e.task, e.data)
}
addhandler __task_metadata_track_eh
addtask py_listtasks
do_py_listtasks[nostamp] = "1"
do_py_listtasks[recrdeptask] = "do_py_listtasks"
python do_py_listtasks() {
import sys
for e in d.keys():
if d.getVarFlag(e, "task") and \
d.getVarFlag(e, "python"):
sys.stdout.write("%s\n" % e)
}
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