Re: [RFC PATCH] Record a single transaction for conflicting push operations

[Catalin Marinas <catalin.marinas@gmail.com>]

Updated patch below:


Record a single transaction for conflicting push operations

From: Catalin Marinas <catalin.marinas@gmail.com>

StGit commands resulting in a conflicting patch pushing record two
transactions in the log (with one of them being inconsistent with HEAD
!= top). Undoing such operations requires two "stg undo" (possibly with
--hard) commands which is unintuitive. This patch changes such
operations to only record one log entry and "stg undo" reverts the stack
to the state prior to the operation.

Signed-off-by: Catalin Marinas <catalin.marinas@gmail.com>
Cc: Gustav Hållberg <gustav@virtutech.com>
Cc: Karl Wiberg <kha@treskal.com>
---
 stgit/lib/transaction.py |   35 ++++++++++++++++-------------------
 t/t3101-reset-hard.sh    |    2 +-
 t/t3103-undo-hard.sh     |    4 ++--
 3 files changed, 19 insertions(+), 22 deletions(-)

diff --git a/stgit/lib/transaction.py b/stgit/lib/transaction.py
index 30a153b..d82e724 100644
--- a/stgit/lib/transaction.py
+++ b/stgit/lib/transaction.py
@@ -90,7 +90,6 @@ class StackTransaction(object):
         self.__applied = list(self.__stack.patchorder.applied)
         self.__unapplied = list(self.__stack.patchorder.unapplied)
         self.__hidden = list(self.__stack.patchorder.hidden)
-        self.__conflicting_push = None
         self.__error = None
         self.__current_tree = self.__stack.head.data.tree
         self.__base = self.__stack.base
@@ -232,10 +231,9 @@ class StackTransaction(object):
             self.__stack.patchorder.hidden = self.__hidden
             log.log_entry(self.__stack, msg)
         old_applied = self.__stack.patchorder.applied
-        write(self.__msg)
-        if self.__conflicting_push != None:
-            self.__patches = _TransPatchMap(self.__stack)
-            self.__conflicting_push()
+        if not self.__conflicts:
+            write(self.__msg)
+        else:
             write(self.__msg + ' (CONFLICT)')
         if print_current_patch:
             _print_current_patch(old_applied, self.__applied)
@@ -358,26 +356,25 @@ class StackTransaction(object):
         elif not merge_conflict and cd.is_nochange():
             s = 'empty'
         out.done(s)
-        def update():
-            if comm:
-                self.patches[pn] = comm
-            if pn in self.hidden:
-                x = self.hidden
-            else:
-                x = self.unapplied
-            del x[x.index(pn)]
-            self.applied.append(pn)
+
         if merge_conflict:
             # We've just caused conflicts, so we must allow them in
             # the final checkout.
             self.__allow_conflicts = lambda trans: True
+            self.__patches = _TransPatchMap(self.__stack)

-            # Save this update so that we can run it a little later.
-            self.__conflicting_push = update
-            self.__halt("%d merge conflict(s)" % len(self.__conflicts))
+        # Update the stack state
+        if comm:
+            self.patches[pn] = comm
+        if pn in self.hidden:
+            x = self.hidden
         else:
-            # Update immediately.
-            update()
+            x = self.unapplied
+        del x[x.index(pn)]
+        self.applied.append(pn)
+
+        if merge_conflict:
+            self.__halt("%d merge conflict(s)" % len(self.__conflicts))

     def push_tree(self, pn):
         """Push the named patch without updating its tree."""
diff --git a/t/t3101-reset-hard.sh b/t/t3101-reset-hard.sh
index bd97b3a..45e86dc 100755
--- a/t/t3101-reset-hard.sh
+++ b/t/t3101-reset-hard.sh
@@ -47,7 +47,7 @@ test_expect_success 'Try to reset with --hard' '
     stg reset --hard master.stgit^~1 &&
     stg status a > actual.txt &&
     test_cmp expected.txt actual.txt &&
-    test "$(echo $(stg series))" = "> p1 - p2 - p3"
+    test "$(echo $(stg series))" = "+ p1 + p2 > p3"
 '

 test_done
diff --git a/t/t3103-undo-hard.sh b/t/t3103-undo-hard.sh
index 2d0f382..df14b1f 100755
--- a/t/t3103-undo-hard.sh
+++ b/t/t3103-undo-hard.sh
@@ -46,11 +46,11 @@ test_expect_success 'Try to undo without --hard' '

 cat > expected.txt <<EOF
 EOF
-test_expect_failure 'Try to undo with --hard' '
+test_expect_success 'Try to undo with --hard' '
     stg undo --hard &&
     stg status a > actual.txt &&
     test_cmp expected.txt actual.txt &&
-    test "$(echo $(stg series))" = "> p1 - p2 - p3" &&
+    test "$(echo $(stg series))" = "+ p1 + p2 > p3" &&
     test "$(stg id)" = "$(stg id $(stg top))"
 '