sanity: Add warning for local hasheqiv server with remote sstate mirrors

We're seeing a lot of users configuring an sstate mirror but not realising that
the default hash equivalenve setting will make this ineffective. Add a warning
to highlight this to the user for the common case.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

diff --git a/meta/classes/sanity.bbclass b/meta/classes/sanity.bbclass
index 92807dc88e91c8b1307ef8eafea78fb83e99d421..be956fbcd6c7af2fd7dfceead2bf30bdc55cd44d 100644 (file)
--- a/meta/classes/sanity.bbclass
+++ b/meta/classes/sanity.bbclass
@@ -914,6 +914,11 @@ def check_sanity_everybuild(status, d):
                     mirror_base = urllib.parse.urlparse(mirror[:-1*len('/PATH')]).path
                     check_symlink(mirror_base, d)
 
+    # Check sstate mirrors aren't being used with a local hash server and no remote
+    hashserv = d.getVar("BB_HASHSERVE")
+    if d.getVar("SSTATE_MIRRORS") and hashserv and hashserv.startswith("unix://") and not d.getVar("BB_HASHSERVE_UPSTREAM"):
+        bb.warn("You are using a local hash equivalence server but have configured an sstate mirror. This will likely mean no sstate will match from the mirror. You may wish to disable the hash equivalence use (BB_HASHSERVE), or use a hash equivalence server alongside the sstate mirror.")
+
     # Check that TMPDIR hasn't changed location since the last time we were run
     tmpdir = d.getVar('TMPDIR')
     checkfile = os.path.join(tmpdir, "saved_tmpdir")