# HG changeset patch
# User Jordi Gutiérrez Hermoso <jordigh@octave.org>
# Date 1412768831 14400
# Node ID d43d116a118cdad11a265bb6907cebae46afba11
# Parent  4cf94aea9b1d5e5e4ee7d66f4b30a163b71bd6a3
shelve: don't delete "." when rebase is a no-op (issue4398)

When unshelving and facing a conflict, if we resolve all conflicts in
favour of the committed changes instead of the shelved changes, then
the ensuing implicit rebase is a no-op. That is, there is nothing to
rebase. In this case, there are no extra intermediate shelve commits
to strip either. Prior to this change, the commit being unshelved to
would be marked for destruction in a rather catastrophic way.

The relevant part of the test case failed as follows:

    $ hg unshelve -c
    unshelve of 'default' complete
    $ hg diff
    warning: ignoring unknown working parent 33f7f61e6c5e!
    diff --git a/a/a b/a/a
    new file mode 100644
    --- /dev/null
           b/a/a
    @@ -0,0   1,3 @@
      a
      c
      x
    $ hg status
    warning: ignoring unknown working parent 33f7f61e6c5e!
    M a/a
    ? a/a.orig
    ? foo/foo
    $ hg summary
    warning: ignoring unknown working parent 33f7f61e6c5e!
    parent: -1:000000000000  (no revision checked out)
    branch: default
    commit: 1 modified, 2 unknown (new branch head)
    update: 4 new changesets (update)

With this change, this test case now passes.

diff -r 4cf94aea9b1d -r d43d116a118c hgext/shelve.py
--- a/hgext/shelve.py	Wed Oct 01 14:59:33 2014 -0500
+++ b/hgext/shelve.py	Wed Oct 08 07:47:11 2014 -0400
@@ -453,10 +453,12 @@
         if not shelvectx in state.pendingctx.children():
             # rebase was a no-op, so it produced no child commit
             shelvectx = state.pendingctx
+        else:
+            # only strip the shelvectx if the rebase produced it
+            state.stripnodes.append(shelvectx.node())
 
         mergefiles(ui, repo, state.wctx, shelvectx)
 
-        state.stripnodes.append(shelvectx.node())
         repair.strip(ui, repo, state.stripnodes, backup='none', topic='shelve')
         shelvedstate.clear(repo)
         unshelvecleanup(ui, repo, state.name, opts)
diff -r 4cf94aea9b1d -r d43d116a118c tests/test-shelve.t
--- a/tests/test-shelve.t	Wed Oct 01 14:59:33 2014 -0500
+++ b/tests/test-shelve.t	Wed Oct 08 07:47:11 2014 -0400
@@ -690,6 +690,49 @@
   g
   $ hg shelve --delete default
 
+Recreate some conflict again
+
+  $ cd ../repo
+  $ hg up -C -r 3
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  (leaving bookmark test)
+  $ echo y >> a/a
+  $ hg shelve
+  shelved as default
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  $ hg up test
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  (activating bookmark test)
+  $ hg unshelve
+  unshelving change 'default'
+  rebasing shelved changes
+  merging a/a
+  warning: conflicts during merge.
+  merging a/a incomplete! (edit conflicts, then use 'hg resolve --mark')
+  unresolved conflicts (see 'hg resolve', then 'hg unshelve --continue')
+  [1]
+
+Test that resolving all conflicts in one direction (so that the rebase
+is a no-op), works (issue4398)
+
+  $ hg revert -a -r .
+  reverting a/a (glob)
+  $ hg resolve -m a/a
+  (no more unresolved files)
+  $ hg unshelve -c
+  unshelve of 'default' complete
+  $ hg diff
+  $ hg status
+  ? a/a.orig
+  ? foo/foo
+  $ hg summary
+  parent: 4:33f7f61e6c5e tip
+   create conflict
+  branch: default
+  bookmarks: *test
+  commit: 2 unknown (clean)
+  update: (current)
+
   $ hg shelve --delete --stat
   abort: options '--delete' and '--stat' may not be used together
   [255]