diff mercurial/debugcommands.py @ 44307:c577bb4a04d4

nodemap: have some python code writing a nodemap in persistent binary form

This python code aims to be as "simple" as possible. It is a reference
implementation of the data we are going to write on disk (and possibly,
later a way for pure python install to make sure the on disk data are up to
date).

It is not optimized for performance and rebuild the full data structure from
the index every time.

This is a stepping stone toward a persistent nodemap on disk.

Differential Revision: https://phab.mercurial-scm.org/D7834

--- a/mercurial/debugcommands.py	Mon Feb 10 17:31:05 2020 -0500
+++ b/mercurial/debugcommands.py	Wed Jan 15 15:47:12 2020 +0100
@@ -95,7 +95,10 @@
     stringutil,
 )
 
-from .revlogutils import deltas as deltautil
+from .revlogutils import (
+    deltas as deltautil,
+    nodemap,
+)
 
 release = lockmod.release
 
@@ -2082,6 +2085,20 @@
 
 
 @command(
+    b'debugnodemap',
+    [(b'', b'dump', False, _(b'write persistent binary nodemap on stdin'))],
+)
+def debugnodemap(ui, repo, **opts):
+    """write and inspect on disk nodemap
+    """
+    if opts['dump']:
+        unfi = repo.unfiltered()
+        cl = unfi.changelog
+        data = nodemap.persistent_data(cl.index)
+        ui.write(data)
+
+
+@command(
     b'debugobsolete',
     [
         (b'', b'flags', 0, _(b'markers flag')),