sstatesig: Update to handle BB_HASHSERVE

Update the code to handle BB_HASHSERV, an autostarted bitbake internal hash
equivalency server suited to local developer usage.

(From OE-Core rev: 9b3d7b0b0ff27281391c2b8f2511d312d6995ed6)

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

meta/conf/bitbake.conf

@@ -885,7 +885,7 @@ BB_HASHBASE_WHITELIST ?= "TMPDIR FILE PATH PWD BB_TASKHASH BBPATH BBSERVER DL_DI
     WARN_QA ERROR_QA WORKDIR STAMPCLEAN PKGDATA_DIR BUILD_ARCH SSTATE_PKGARCH \
     BB_WORKERCONTEXT BB_LIMITEDDEPS BB_UNIHASH extend_recipe_sysroot DEPLOY_DIR \
     SSTATE_HASHEQUIV_METHOD SSTATE_HASHEQUIV_SERVER SSTATE_HASHEQUIV_REPORT_TASKDATA \
-    SSTATE_HASHEQUIV_OWNER CCACHE_TOP_DIR"
+    SSTATE_HASHEQUIV_OWNER CCACHE_TOP_DIR BB_HASHSERVE"
 BB_HASHCONFIG_WHITELIST ?= "${BB_HASHBASE_WHITELIST} DATE TIME SSH_AGENT_PID \
     SSH_AUTH_SOCK PSEUDO_BUILD BB_ENV_EXTRAWHITE DISABLE_SANITY_CHECKS \
     PARALLEL_MAKE BB_NUMBER_THREADS BB_ORIGENV BB_INVALIDCONF BBINCLUDED \

meta/lib/oe/sstatesig.py

@@ -271,9 +271,13 @@ class SignatureGeneratorOEEquivHash(bb.siggen.SignatureGeneratorUniHashMixIn, Si
 
     def init_rundepcheck(self, data):
         super().init_rundepcheck(data)
-        self.server = data.getVar('SSTATE_HASHEQUIV_SERVER')
+        autostart = data.getVar('BB_HASHSERVE')
+        if autostart:
+            self.server = "http://" + autostart
+        else:
+            self.server = data.getVar('SSTATE_HASHEQUIV_SERVER')
         if not self.server:
-            bb.fatal("OEEquivHash requires SSTATE_HASHEQUIV_SERVER to be set")
+            bb.fatal("OEEquivHash requires SSTATE_HASHEQUIV_SERVER or BB_HASHSERVE to be set")
         self.method = data.getVar('SSTATE_HASHEQUIV_METHOD')
         if not self.method:
             bb.fatal("OEEquivHash requires SSTATE_HASHEQUIV_METHOD to be set")