bundle2: load hookargs from bundleoperation into transaction when started one

bundle2: load hookargs from bundleoperation into transaction when started one

When a transaction is started, we must load the hookargs from the
bundleoperation object to the transaction so that they can be used in the
transaction. Also this patch makes sure no more hookargs are added to the
bundleoperation object once the transaction starts.

This is a part of porting fb extension bundle2hooks to core.

Differential Revision: https://phab.mercurial-scm.org/D209

--- a/mercurial/bundle2.py	Wed Aug 02 03:08:42 2017 +0530
+++ b/mercurial/bundle2.py	Wed Aug 02 03:23:06 2017 +0530
@@ -296,12 +296,31 @@
         self.repo = repo
         self.ui = repo.ui
         self.records = unbundlerecords()
-        self.gettransaction = transactiongetter
         self.reply = None
         self.captureoutput = captureoutput
         self.hookargs = {}
+        self._gettransaction = transactiongetter
+
+    def gettransaction(self):
+        transaction = self._gettransaction()
+
+        if self.hookargs is not None:
+            # the ones added to the transaction supercede those added
+            # to the operation.
+            self.hookargs.update(transaction.hookargs)
+            transaction.hookargs = self.hookargs
+
+            # mark the hookargs as flushed.  further attempts to add to
+            # hookargs will result in an abort.
+            self.hookargs = None
+
+        return transaction
 
     def addhookargs(self, hookargs):
+        if self.hookargs is None:
+            raise error.Abort(
+                _('attempted to add hooks to operation after transaction '
+                  'started'))
         self.hookargs.update(hookargs)
 
 class TransactionUnavailable(RuntimeError):

--- a/tests/test-acl.t	Wed Aug 02 03:08:42 2017 +0530
+++ b/tests/test-acl.t	Wed Aug 02 03:23:06 2017 +0530
@@ -120,7 +120,7 @@
   bundle2-output-bundle: "HG20", 2 parts total
   bundle2-output-part: "reply:changegroup" (advisory) (params: 0 advisory) empty payload
   bundle2-output-part: "reply:pushkey" (params: 0 advisory) empty payload
-  bundle2-input-bundle: no-transaction
+  bundle2-input-bundle: with-transaction
   bundle2-input-part: "reply:changegroup" (advisory) (params: 0 advisory) supported
   bundle2-input-part: "reply:pushkey" (params: 0 advisory) supported
   bundle2-input-bundle: 1 parts total
@@ -184,7 +184,7 @@
   bundle2-output-bundle: "HG20", 2 parts total
   bundle2-output-part: "reply:changegroup" (advisory) (params: 0 advisory) empty payload
   bundle2-output-part: "reply:pushkey" (params: 0 advisory) empty payload
-  bundle2-input-bundle: no-transaction
+  bundle2-input-bundle: with-transaction
   bundle2-input-part: "reply:changegroup" (advisory) (params: 0 advisory) supported
   bundle2-input-part: "reply:pushkey" (params: 0 advisory) supported
   bundle2-input-bundle: 1 parts total
@@ -259,7 +259,7 @@
   bundle2-output-bundle: "HG20", 2 parts total
   bundle2-output-part: "reply:changegroup" (advisory) (params: 0 advisory) empty payload
   bundle2-output-part: "reply:pushkey" (params: 0 advisory) empty payload
-  bundle2-input-bundle: no-transaction
+  bundle2-input-bundle: with-transaction
   bundle2-input-part: "reply:changegroup" (advisory) (params: 0 advisory) supported
   bundle2-input-part: "reply:pushkey" (params: 0 advisory) supported
   bundle2-input-bundle: 1 parts total
@@ -742,7 +742,7 @@
   bundle2-output-bundle: "HG20", 2 parts total
   bundle2-output-part: "reply:changegroup" (advisory) (params: 0 advisory) empty payload
   bundle2-output-part: "reply:pushkey" (params: 0 advisory) empty payload
-  bundle2-input-bundle: no-transaction
+  bundle2-input-bundle: with-transaction
   bundle2-input-part: "reply:changegroup" (advisory) (params: 0 advisory) supported
   bundle2-input-part: "reply:pushkey" (params: 0 advisory) supported
   bundle2-input-bundle: 1 parts total
@@ -1056,7 +1056,7 @@
   bundle2-output-bundle: "HG20", 2 parts total
   bundle2-output-part: "reply:changegroup" (advisory) (params: 0 advisory) empty payload
   bundle2-output-part: "reply:pushkey" (params: 0 advisory) empty payload
-  bundle2-input-bundle: no-transaction
+  bundle2-input-bundle: with-transaction
   bundle2-input-part: "reply:changegroup" (advisory) (params: 0 advisory) supported
   bundle2-input-part: "reply:pushkey" (params: 0 advisory) supported
   bundle2-input-bundle: 1 parts total
@@ -1141,7 +1141,7 @@
   bundle2-output-bundle: "HG20", 2 parts total
   bundle2-output-part: "reply:changegroup" (advisory) (params: 0 advisory) empty payload
   bundle2-output-part: "reply:pushkey" (params: 0 advisory) empty payload
-  bundle2-input-bundle: no-transaction
+  bundle2-input-bundle: with-transaction
   bundle2-input-part: "reply:changegroup" (advisory) (params: 0 advisory) supported
   bundle2-input-part: "reply:pushkey" (params: 0 advisory) supported
   bundle2-input-bundle: 1 parts total
@@ -1298,7 +1298,7 @@
   bundle2-output-bundle: "HG20", 2 parts total
   bundle2-output-part: "reply:changegroup" (advisory) (params: 0 advisory) empty payload
   bundle2-output-part: "reply:pushkey" (params: 0 advisory) empty payload
-  bundle2-input-bundle: no-transaction
+  bundle2-input-bundle: with-transaction
   bundle2-input-part: "reply:changegroup" (advisory) (params: 0 advisory) supported
   bundle2-input-part: "reply:pushkey" (params: 0 advisory) supported
   bundle2-input-bundle: 1 parts total
@@ -1502,7 +1502,7 @@
   bundle2-output-part: "reply:changegroup" (advisory) (params: 0 advisory) empty payload
   bundle2-output-part: "reply:pushkey" (params: 0 advisory) empty payload
   bundle2-output-part: "reply:pushkey" (params: 0 advisory) empty payload
-  bundle2-input-bundle: no-transaction
+  bundle2-input-bundle: with-transaction
   bundle2-input-part: "reply:changegroup" (advisory) (params: 0 advisory) supported
   bundle2-input-part: "reply:pushkey" (params: 0 advisory) supported
   bundle2-input-part: "reply:pushkey" (params: 0 advisory) supported
@@ -1798,7 +1798,7 @@
   bundle2-output-part: "reply:changegroup" (advisory) (params: 0 advisory) empty payload
   bundle2-output-part: "reply:pushkey" (params: 0 advisory) empty payload
   bundle2-output-part: "reply:pushkey" (params: 0 advisory) empty payload
-  bundle2-input-bundle: no-transaction
+  bundle2-input-bundle: with-transaction
   bundle2-input-part: "reply:changegroup" (advisory) (params: 0 advisory) supported
   bundle2-input-part: "reply:pushkey" (params: 0 advisory) supported
   bundle2-input-part: "reply:pushkey" (params: 0 advisory) supported
@@ -1891,7 +1891,7 @@
   bundle2-output-part: "reply:changegroup" (advisory) (params: 0 advisory) empty payload
   bundle2-output-part: "reply:pushkey" (params: 0 advisory) empty payload
   bundle2-output-part: "reply:pushkey" (params: 0 advisory) empty payload
-  bundle2-input-bundle: no-transaction
+  bundle2-input-bundle: with-transaction
   bundle2-input-part: "reply:changegroup" (advisory) (params: 0 advisory) supported
   bundle2-input-part: "reply:pushkey" (params: 0 advisory) supported
   bundle2-input-part: "reply:pushkey" (params: 0 advisory) supported
@@ -2052,7 +2052,7 @@
   bundle2-output-part: "reply:changegroup" (advisory) (params: 0 advisory) empty payload
   bundle2-output-part: "reply:pushkey" (params: 0 advisory) empty payload
   bundle2-output-part: "reply:pushkey" (params: 0 advisory) empty payload
-  bundle2-input-bundle: no-transaction
+  bundle2-input-bundle: with-transaction
   bundle2-input-part: "reply:changegroup" (advisory) (params: 0 advisory) supported
   bundle2-input-part: "reply:pushkey" (params: 0 advisory) supported
   bundle2-input-part: "reply:pushkey" (params: 0 advisory) supported