D12094: debugbuilddag: add a flag to allow running it from a non-empty repository

[marmoute (Pierre-Yves David)]

marmoute created this revision.
Herald added a reviewer: hg-reviewers.
Herald added a subscriber: mercurial-patches.

REVISION SUMMARY
  Allow that by default seems "dangerous", but having a flag to make it possible
  will be useful to help building some repository incrementally. The newly introduced support is basic, but already useful.

REPOSITORY
  rHG Mercurial

BRANCH
  default

REVISION DETAIL
  https://phab.mercurial-scm.org/D12094

AFFECTED FILES
  mercurial/debugcommands.py
  tests/test-completion.t

CHANGE DETAILS

diff --git a/tests/test-completion.t b/tests/test-completion.t
--- a/tests/test-completion.t
+++ b/tests/test-completion.t
@@ -272,7 +272,7 @@
   debugantivirusrunning: 
   debugapplystreamclonebundle: 
   debugbackupbundle: recover, patch, git, limit, no-merges, stat, graph, style, template
-  debugbuilddag: mergeable-file, overwritten-file, new-file
+  debugbuilddag: mergeable-file, overwritten-file, new-file, from-existing
   debugbundle: all, part-type, spec
   debugcapabilities: 
   debugchangedfiles: compute
diff --git a/mercurial/debugcommands.py b/mercurial/debugcommands.py
--- a/mercurial/debugcommands.py
+++ b/mercurial/debugcommands.py
@@ -178,6 +178,12 @@
             _(b'add single file all revs overwrite'),
         ),
         (b'n', b'new-file', None, _(b'add new file at each rev')),
+        (
+            b'',
+            b'from-existing',
+            None,
+            _(b'continue from a non-empty repository'),
+        ),
     ],
     _(b'[OPTION]... [TEXT]'),
 )
@@ -188,6 +194,7 @@
     mergeable_file=False,
     overwritten_file=False,
     new_file=False,
+    from_existing=False,
 ):
     """builds a repo with a given DAG from scratch in the current empty repo
 
@@ -226,7 +233,7 @@
         text = ui.fin.read()
 
     cl = repo.changelog
-    if len(cl) > 0:
+    if len(cl) > 0 and not from_existing:
         raise error.Abort(_(b'repository is not empty'))
 
     # determine number of revs in DAG



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Cc: mercurial-patches, mercurial-devel