# HG changeset patch
# User Yuya Nishihara <yuya@tcha.org>
# Date 1428503402 -32400
# Node ID 33ab99a6ad9b2492af4f3c7a45736d2aac50f980
# Parent  0974d3a0be294fb5327f9d8c228120258725097b
archive: look for first visible revision to build repo identity (issue4591)

No test for the case where all revisions are hidden because "archive" command
aborts if the target revision is null.

diff -r 0974d3a0be29 -r 33ab99a6ad9b mercurial/archival.py
--- a/mercurial/archival.py	Wed Apr 08 22:42:37 2015 +0900
+++ b/mercurial/archival.py	Wed Apr 08 23:30:02 2015 +0900
@@ -54,11 +54,17 @@
             return kind
     return None
 
+def _rootctx(repo):
+    # repo[0] may be hidden
+    for rev in repo:
+        return repo[rev]
+    return repo['null']
+
 def buildmetadata(ctx):
     '''build content of .hg_archival.txt'''
     repo = ctx.repo()
     base = 'repo: %s\nnode: %s\nbranch: %s\n' % (
-        repo[0].hex(), ctx.hex(), encoding.fromlocal(ctx.branch()))
+        _rootctx(repo).hex(), ctx.hex(), encoding.fromlocal(ctx.branch()))
 
     tags = ''.join('tag: %s\n' % t for t in ctx.tags()
                    if repo.tagtype(t) == 'global')
diff -r 0974d3a0be29 -r 33ab99a6ad9b tests/test-obsolete.t
--- a/tests/test-obsolete.t	Wed Apr 08 22:42:37 2015 +0900
+++ b/tests/test-obsolete.t	Wed Apr 08 23:30:02 2015 +0900
@@ -250,6 +250,30 @@
   o  0:1f0dee641bb7 (public) [ ] add a
   
 
+  $ cd ..
+
+Revision 0 is hidden
+--------------------
+
+  $ hg init rev0hidden
+  $ cd rev0hidden
+
+  $ mkcommit kill0
+  $ hg up -q null
+  $ hg debugobsolete `getid kill0`
+  $ mkcommit a
+  $ mkcommit b
+
+Should pick the first visible revision as "repo" node
+
+  $ hg archive ../archive-null
+  $ cat ../archive-null/.hg_archival.txt
+  repo: 1f0dee641bb7258c56bd60e93edfa2405381c41e
+  node: 7c3bad9141dcb46ff89abf5f61856facd56e476c
+  branch: default
+  latesttag: null
+  latesttagdistance: 2
+  changessincelatesttag: 2
 
 
   $ cd ..