[oe] [meta-oe][PATCH 3/3] restore_headrevs.bbclass: add

[Christopher Larson]

From: Christopher Larson <chris_larson at mentor.com>

If BB_NO_NETWORK=1, this class restores saved bitbake URI headrevs.

This is useful to support BB_NO_NETWORK with AUTOREV, by letting someone ship
dumped headrevs to the user, who then inherit this class, which ensures that
the cached headrevs are used, and upstream is not contacted at parse time.
BB_SRCREV_POLICY will be set to "cache" as well, if it's not already set, as
otherwise bitbake will contact upstream to update the cached values.

This only handles restoring dumped headrevs. Using the python module to dump
to this database will likely be done at release time, elsewhere.

Signed-off-by: Christopher Larson <chris_larson at mentor.com>
---
 meta-oe/classes/restore_headrevs.bbclass | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 meta-oe/classes/restore_headrevs.bbclass

diff --git a/meta-oe/classes/restore_headrevs.bbclass b/meta-oe/classes/restore_headrevs.bbclass
new file mode 100644
index 0000000..0d83428
--- /dev/null
+++ b/meta-oe/classes/restore_headrevs.bbclass
@@ -0,0 +1,32 @@
+# If BB_NO_NETWORK=1, this class restores saved bitbake URI headrevs.
+#
+# This is useful to support BB_NO_NETWORK with AUTOREV, by letting someone
+# ship dumped headrevs to the user, who then inherit this class, which ensures
+# that the cached headrevs are used, and upstream is not contacted at parse
+# time. BB_SRCREV_POLICY will be set to "cache" as well, if it's not already
+# set, as otherwise bitbake will contact upstream to update the cached values.
+#
+# See also lib/oe/headrevs.py.
+#
+# This only handles restoring dumped headrevs. Using the python module to dump
+# to this database will likely be done at release time, elsewhere.
+
+HEADREVS_RESTORE_STAMP ?= "${PERSISTENT_DIR}/headrevs_restored"
+DUMPED_HEADREVS_DB ?= "${COREBASE}/headrevs.db"
+
+python restore_dumped_headrevs() {
+    dump_db_path = d.getVar('DUMPED_HEADREVS_DB', True)
+    if os.path.exists(dump_db_path) and d.getVar('BB_NO_NETWORK', True) == '1':
+        if 'BB_SRCREV_POLICY' not in d:
+            d.setVar('BB_SRCREV_POLICY', 'cache')
+
+        stamp_path = d.getVar('HEADREVS_RESTORE_STAMP', True)
+        if (not os.path.exists(stamp_path) or
+                os.path.getmtime(dump_db_path) > os.path.getmtime(stamp_path)):
+            import oe.headrevs
+            oe.headrevs.restore_headrevs(d, dump_db_path)
+            bb.utils.mkdirhier(os.path.dirname(stamp_path))
+            open(stamp_path, 'w').close()
+}
+restore_dumped_headrevs[eventmask] = "bb.event.ConfigParsed"
+addhandler restore_dumped_headrevs
-- 
2.2.1