[PATCH] repoview: introduce a `experimental.extra-filter-revs` config

Pierre-Yves David pierre-yves.david at ens-lyon.org
Tue Apr 16 18:41:49 EDT 2019


# HG changeset patch
# User Pierre-Yves David <pierre-yves.david at octobus.net>
# Date 1554565579 -7200
#      Sat Apr 06 17:46:19 2019 +0200
# Node ID 86eac5d2d7a1386dca5970126506d07201058200
# Parent  eebf78724d94649de84f921ff5bd39cbc0f48cb6
# EXP-Topic repoview
# Available At https://bitbucket.org/octobus/mercurial-devel/
#              hg pull https://bitbucket.org/octobus/mercurial-devel/ -r 86eac5d2d7a1
repoview: introduce a `experimental.extra-filter-revs` config

The option define revisions to additionally filter out of all repository "view".
The end goal is to provide and easy to way to serve multiple subset of the same
repository using multiple "shares".

The simplest use case of this feature is to have one view serving the public
changesets and one view also serving the draft. This is currently achievable
using the new `server.view` option introduced recently by Joerg Sonnenberger.
However, more advanced use cases need more advanced definitions. For example
some needs a view dedicated to some release branches, or view that hides
security fixes to be released. Joerg Sonnenberger and I discussed this topic at
the recent mini-sprint and the both of us have seen real life use cases for
this. (This series got written during the same mini-sprint).

The feature is fully functional, and use similar cache-fallback mechanism to
ensure decent performance. However,there remaining room to ensure each share
caches and hooks collaborate with each others. This will come at a later time
once users start to actually test this feature on real usecase.

diff --git a/mercurial/configitems.py b/mercurial/configitems.py
--- a/mercurial/configitems.py
+++ b/mercurial/configitems.py
@@ -529,6 +529,13 @@ coreconfigitem('experimental', 'evolutio
 coreconfigitem('experimental', 'evolution.track-operation',
     default=True,
 )
+# repo-level config to exclude a revset visibility
+#
+# The target use case is to use `share` to expose different subset of the same
+# repository, especially server side. See also `server.view`.
+coreconfigitem('experimental', 'extra-filter-revs',
+    default=None,
+)
 coreconfigitem('experimental', 'maxdeltachainspan',
     default=-1,
 )
diff --git a/mercurial/localrepo.py b/mercurial/localrepo.py
--- a/mercurial/localrepo.py
+++ b/mercurial/localrepo.py
@@ -1050,6 +1050,8 @@ class localrepository(object):
         # Signature to cached matcher instance.
         self._sparsematchercache = {}
 
+        self._extrafilterid = repoview.extrafilter(ui)
+
     def _getvfsward(self, origfunc):
         """build a ward for self.vfs"""
         rref = weakref.ref(self)
@@ -1197,6 +1199,9 @@ class localrepository(object):
 
         In other word, there is always only one level of `repoview` "filtering".
         """
+        if self._extrafilterid is not None:
+            name = name + '%'  + self._extrafilterid
+
         cls = repoview.newtype(self.unfiltered().__class__)
         return cls(self, name, visibilityexceptions)
 
diff --git a/mercurial/repoview.py b/mercurial/repoview.py
--- a/mercurial/repoview.py
+++ b/mercurial/repoview.py
@@ -17,6 +17,10 @@ from . import (
     phases,
     pycompat,
     tags as tagsmod,
+    util,
+)
+from .utils import (
+    repoviewutil,
 )
 
 def hideablerevs(repo):
@@ -154,6 +158,35 @@ filtertable = {'visible': computehidden,
                'immutable':  computemutable,
                'base':  computeimpactable}
 
+_basefiltername = list(filtertable)
+
+def extrafilter(ui):
+    """initialize extra filter and return its id
+
+    If extra filtering is configured, we make sure the associated filtered view
+    are declared and return the associated id.
+    """
+    frevs = ui.config('experimental', 'extra-filter-revs')
+    if frevs is None:
+        return None
+
+    fid = util.DIGESTS['sha512'](frevs).hexdigest()
+
+    combine = lambda fname: fname + '%' + fid
+
+    subsettable = repoviewutil.subsettable
+
+    if combine('base') not in filtertable:
+        for name in _basefiltername:
+            def extrafilteredrevs(repo, *args, **kwargs):
+                baserevs = filtertable[name](repo, *args, **kwargs)
+                extrarevs = frozenset(repo.revs(frevs))
+                return baserevs | extrarevs
+            filtertable[combine(name)] = extrafilteredrevs
+            if name in subsettable:
+                subsettable[combine(name)] = combine(subsettable[name])
+    return fid
+
 def filterrevs(repo, filtername, visibilityexceptions=None):
     """returns set of filtered revision for this filter name
 
diff --git a/mercurial/statichttprepo.py b/mercurial/statichttprepo.py
--- a/mercurial/statichttprepo.py
+++ b/mercurial/statichttprepo.py
@@ -155,6 +155,7 @@ class statichttprepository(localrepo.loc
 
         self.names = namespaces.namespaces()
         self.filtername = None
+        self._extrafilterid = None
 
         try:
             requirements = set(self.vfs.read(b'requires').splitlines())
diff --git a/tests/test-server-view.t b/tests/test-server-view.t
--- a/tests/test-server-view.t
+++ b/tests/test-server-view.t
@@ -34,5 +34,21 @@
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     r0
   
+
+Check same result using `experimental.extra-filter-revs`
+
+  $ hg -R test --config experimental.extra-filter-revs='not public()' serve -p $HGPORT1 -d --pid-file=hg2.pid -E errors.log
+  $ cat hg2.pid >> $DAEMON_PIDS
+  $ hg -R test2 incoming http://foo:xyzzy@localhost:$HGPORT1/
+  comparing with http://foo:***@localhost:$HGPORT1/
+  changeset:   0:1ea73414a91b
+  tag:         tip
+  user:        debugbuilddag
+  date:        Thu Jan 01 00:00:00 1970 +0000
+  summary:     r0
+  
+
+cleanup
+
   $ cat errors.log
   $ killdaemons.py


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