unbundle: support bundle2 files

This adds support for bundle2 files to the unbundle command.

mercurial/commands.py

@@ -6142,6 +6142,18 def unbundle(ui, repo, fname1, *fnames,
         for fname in fnames:
             f = hg.openpath(ui, fname)
             gen = exchange.readbundle(ui, f, fname)
+            if isinstance(gen, bundle2.unbundle20):
+                tr = repo.transaction('unbundle')
+                try:
+                    op = bundle2.processbundle(repo, gen, lambda: tr)
+                    tr.close()
+                finally:
+                    if tr:
+                        tr.release()
+                changes = [r.get('result', 0)
+                           for r in op.records['changegroup']]
+                modheads = changegroup.combineresults(changes)
+            else:
             modheads = changegroup.addchangegroup(repo, gen, 'unbundle',
                                                   'bundle:' + fname)
     finally:

tests/test-bundle2-format.t

@@ -762,13 +762,11 Support for changegroup
       9520eea781bcca16c1e15acc0ba14335a0e8e5ba
       eea13746799a9e0bfd88f29d3c2e9dc9389f524f
       02de42196ebee42ef284b6780a87cdc96e8eaab6
-  $ hg unbundle2 < ../rev.hg2
+  $ hg unbundle ../rev.hg2
   adding changesets
   adding manifests
   adding file changes
   added 0 changesets with 0 changes to 3 files
-  0 unread bytes
-  addchangegroup return: 1
 
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