# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@octobus.net>
# Date 2020-01-15 14:50:04
# Node ID 6614b301ea5887acc30a694344188b0ad826a613
# Parent  50ad851efd9b2ded7d278be6aab03f4572bccd32

nodemap: add a flag to dump the details of the docket

We are about to add more information to the docket. We first introduce a way to
debug its content.

Differential Revision: https://phab.mercurial-scm.org/D7887

diff --git a/mercurial/debugcommands.py b/mercurial/debugcommands.py
--- a/mercurial/debugcommands.py
+++ b/mercurial/debugcommands.py
@@ -2100,6 +2100,12 @@ def debugnamecomplete(ui, repo, *args):
             False,
             _(b'check that the data on disk data are correct.'),
         ),
+        (
+            b'',
+            b'metadata',
+            False,
+            _(b'display the on disk meta data for the nodemap'),
+        ),
     ],
 )
 def debugnodemap(ui, repo, **opts):
@@ -2124,6 +2130,13 @@ def debugnodemap(ui, repo, **opts):
         if nm_data is not None:
             docket, data = nm_data
             return nodemap.check_data(ui, cl.index, data)
+    elif opts['metadata']:
+        unfi = repo.unfiltered()
+        cl = unfi.changelog
+        nm_data = nodemap.persisted_data(cl)
+        if nm_data is not None:
+            docket, data = nm_data
+            ui.write((b"uid: %s\n") % docket.uid)
 
 
 @command(
diff --git a/tests/test-completion.t b/tests/test-completion.t
--- a/tests/test-completion.t
+++ b/tests/test-completion.t
@@ -291,7 +291,7 @@ Show all commands + options
   debugmanifestfulltextcache: clear, add
   debugmergestate: 
   debugnamecomplete: 
-  debugnodemap: dump-new, dump-disk, check
+  debugnodemap: dump-new, dump-disk, check, metadata
   debugobsolete: flags, record-parents, rev, exclusive, index, delete, date, user, template
   debugp1copies: rev
   debugp2copies: rev
diff --git a/tests/test-persistent-nodemap.t b/tests/test-persistent-nodemap.t
--- a/tests/test-persistent-nodemap.t
+++ b/tests/test-persistent-nodemap.t
@@ -12,6 +12,8 @@ Test the persistent on-disk nodemap
   > persistent-nodemap=yes
   > EOF
   $ hg debugbuilddag .+5000
+  $ hg debugnodemap --metadata
+  uid: ???????????????? (glob)
   $ f --size .hg/store/00changelog.n
   .hg/store/00changelog.n: size=18
   $ f --sha256 .hg/store/00changelog-*.nd
@@ -47,6 +49,8 @@ add a new commit
   $ echo foo > foo
   $ hg add foo
   $ hg ci -m 'foo'
+  $ hg debugnodemap --metadata
+  uid: ???????????????? (glob)
   $ f --size .hg/store/00changelog.n
   .hg/store/00changelog.n: size=18