bitbake: fetch2: Add autorev warning when it is set too late

Bitbake expects a consistent metadata environment when it parses. There
are plenty of ways you can set a recipe to autorev at a point where parts
of the fetcher have already been triggered leading to obsure bugs which
I struggled to debug, let alone anyone not familar with the code.

If anyone is running into the message from the commit, the issue is
likely one of timing. Keep in mind that the anonymous python code
in base.bbclass will expand variables like FILESPATH, WORKDIR and others
which contain PV. The recipe needs to be set to AUTOREV before that
anonymous python runs.

In particular, that means you can't set SRCREV = "${AUTOREV}" in other
anonymous python, it needs to happen earlier.

(Bitbake rev: 4d9ec332d5bfc8b60b54f8ec2a17d34e35aa903a)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 6 insertions, 2 deletions

diff --git a/bitbake/lib/bb/fetch2/__init__.py b/bitbake/lib/bb/fetch2/__init__.py
index 3b96849a25..718b9f2958 100644
--- a/bitbake/lib/bb/fetch2/__init__.py
+++ b/bitbake/lib/bb/fetch2/__init__.py
@@ -749,10 +749,13 @@ def subprocess_setup():
     # SIGPIPE errors are known issues with gzip/bash
     signal.signal(signal.SIGPIPE, signal.SIG_DFL)
 
-def get_autorev(d):
-    #  only not cache src rev in autorev case
+def mark_recipe_nocache(d):
     if d.getVar('BB_SRCREV_POLICY') != "cache":
         d.setVar('BB_DONT_CACHE', '1')
+
+def get_autorev(d):
+    mark_recipe_nocache(d)
+    d.setVar("__BBAUTOREV_SEEN", True)
     return "AUTOINC"
 
 def get_srcrev(d, method_name='sortable_revision'):
@@ -1219,6 +1222,7 @@ def srcrev_internal_helper(ud, d, name):
     if srcrev == "INVALID" or not srcrev:
         raise FetchError("Please set a valid SRCREV for url %s (possible key names are %s, or use a ;rev=X URL parameter)" % (str(attempts), ud.url), ud.url)
     if srcrev == "AUTOINC":
+        d.setVar("__BBAUTOREV_ACTED_UPON", True)
         srcrev = ud.method.latest_revision(ud, d, name)
 
     return srcrev