D4096: narrow: call narrowspec.{save,restore,clear}backup directly

[martinvonz (Martin von Zweigbergk)]

martinvonz created this revision.
Herald added a reviewer: durin42.
Herald added a subscriber: mercurial-devel.
Herald added a reviewer: hg-reviewers.

REVISION SUMMARY
  I want to move .hg/narrowspec to .hg/store/narrowspec and we need to
  decouple the narrowspec update from the dirstate update for that. This
  patch lets the callers call the narrowspec backup functions directly,
  in addition to the dirstate backup functions. The narrowspec methods
  are made to check if narrowing is enabled. For that, a repo instance
  was needed, which all the callers luckily already had available.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D4096

AFFECTED FILES
  hgext/narrow/narrowdirstate.py
  hgext/shelve.py
  mercurial/dirstateguard.py
  mercurial/localrepo.py
  mercurial/narrowspec.py

CHANGE DETAILS

diff --git a/mercurial/narrowspec.py b/mercurial/narrowspec.py
--- a/mercurial/narrowspec.py
+++ b/mercurial/narrowspec.py
@@ -13,6 +13,7 @@
 from . import (
     error,
     match as matchmod,
+    repository,
     util,
 )
 
@@ -145,15 +146,22 @@
     spec = format(includepats, excludepats)
     repo.vfs.write(FILENAME, spec)
 
-def savebackup(vfs, backupname):
+def savebackup(repo, backupname):
+    if repository.NARROW_REQUIREMENT not in repo.requirements:
+        return
+    vfs = repo.vfs
     vfs.tryunlink(backupname)
     util.copyfile(vfs.join(FILENAME), vfs.join(backupname), hardlink=True)
 
-def restorebackup(vfs, backupname):
-    vfs.rename(backupname, FILENAME, checkambig=True)
+def restorebackup(repo, backupname):
+    if repository.NARROW_REQUIREMENT not in repo.requirements:
+        return
+    repo.vfs.rename(backupname, FILENAME, checkambig=True)
 
-def clearbackup(vfs, backupname):
-    vfs.unlink(backupname)
+def clearbackup(repo, backupname):
+    if repository.NARROW_REQUIREMENT not in repo.requirements:
+        return
+    repo.vfs.unlink(backupname)
 
 def restrictpatterns(req_includes, req_excludes, repo_includes, repo_excludes):
     r""" Restricts the patterns according to repo settings,
diff --git a/mercurial/localrepo.py b/mercurial/localrepo.py
--- a/mercurial/localrepo.py
+++ b/mercurial/localrepo.py
@@ -1372,6 +1372,7 @@
             else:
                 # discard all changes (including ones already written
                 # out) in this transaction
+                narrowspec.restorebackup(self, 'journal.narrowspec')
                 repo.dirstate.restorebackup(None, 'journal.dirstate')
 
                 repo.invalidate(clearfilecache=True)
@@ -1460,6 +1461,7 @@
     @unfilteredmethod
     def _writejournal(self, desc):
         self.dirstate.savebackup(None, 'journal.dirstate')
+        narrowspec.savebackup(self, 'journal.narrowspec')
         self.vfs.write("journal.branch",
                           encoding.fromlocal(self.dirstate.branch()))
         self.vfs.write("journal.desc",
@@ -1547,6 +1549,7 @@
             # prevent dirstateguard from overwriting already restored one
             dsguard.close()
 
+            narrowspec.restorebackup(self, 'undo.narrowspec')
             self.dirstate.restorebackup(None, 'undo.dirstate')
             try:
                 branch = self.vfs.read('undo.branch')
diff --git a/mercurial/dirstateguard.py b/mercurial/dirstateguard.py
--- a/mercurial/dirstateguard.py
+++ b/mercurial/dirstateguard.py
@@ -11,6 +11,7 @@
 
 from . import (
     error,
+    narrowspec,
     util,
 )
 
@@ -33,7 +34,10 @@
         self._active = False
         self._closed = False
         self._backupname = 'dirstate.backup.%s.%d' % (name, id(self))
+        self._narrowspecbackupname = ('narrowspec.backup.%s.%d' %
+                                      (name, id(self)))
         repo.dirstate.savebackup(repo.currenttransaction(), self._backupname)
+        narrowspec.savebackup(repo, self._narrowspecbackupname)
         self._active = True
 
     def __del__(self):
@@ -52,10 +56,12 @@
 
         self._repo.dirstate.clearbackup(self._repo.currenttransaction(),
                                          self._backupname)
+        narrowspec.clearbackup(self._repo, self._narrowspecbackupname)
         self._active = False
         self._closed = True
 
     def _abort(self):
+        narrowspec.restorebackup(self._repo, self._narrowspecbackupname)
         self._repo.dirstate.restorebackup(self._repo.currenttransaction(),
                                            self._backupname)
         self._active = False
diff --git a/hgext/shelve.py b/hgext/shelve.py
--- a/hgext/shelve.py
+++ b/hgext/shelve.py
@@ -41,6 +41,7 @@
     lock as lockmod,
     mdiff,
     merge,
+    narrowspec,
     node as nodemod,
     patch,
     phases,
@@ -314,10 +315,13 @@
     '''Abort current transaction for shelve/unshelve, but keep dirstate
     '''
     tr = repo.currenttransaction()
-    backupname = 'dirstate.shelve'
-    repo.dirstate.savebackup(tr, backupname)
+    dirstatebackupname = 'dirstate.shelve'
+    narrowspecbackupname = 'narrowspec.shelve'
+    repo.dirstate.savebackup(tr, dirstatebackupname)
+    narrowspec.savebackup(repo, narrowspecbackupname)
     tr.abort()
-    repo.dirstate.restorebackup(None, backupname)
+    narrowspec.restorebackup(repo, narrowspecbackupname)
+    repo.dirstate.restorebackup(None, dirstatebackupname)
 
 def createcmd(ui, repo, pats, opts):
     """subcommand that creates a new shelve"""
diff --git a/hgext/narrow/narrowdirstate.py b/hgext/narrow/narrowdirstate.py
--- a/hgext/narrow/narrowdirstate.py
+++ b/hgext/narrow/narrowdirstate.py
@@ -11,7 +11,6 @@
 from mercurial import (
     error,
     match as matchmod,
-    narrowspec,
 )
 
 def wrapdirstate(repo, dirstate):
@@ -28,10 +27,6 @@
             return fn(self, *args)
         return _wrapper
 
-    def _narrowbackupname(backupname):
-        assert 'dirstate' in backupname
-        return backupname.replace('dirstate', narrowspec.FILENAME)
-
     class narrowdirstate(dirstate.__class__):
         def walk(self, match, subrepos, unknown, ignored, full=True,
                  narrowonly=True):
@@ -77,18 +72,5 @@
                 allfiles = [f for f in allfiles if repo.narrowmatch()(f)]
             super(narrowdirstate, self).rebuild(parent, allfiles, changedfiles)
 
-        def restorebackup(self, tr, backupname):
-            narrowspec.restorebackup(self._opener,
-                                     _narrowbackupname(backupname))
-            super(narrowdirstate, self).restorebackup(tr, backupname)
-
-        def savebackup(self, tr, backupname):
-            super(narrowdirstate, self).savebackup(tr, backupname)
-            narrowspec.savebackup(self._opener, _narrowbackupname(backupname))
-
-        def clearbackup(self, tr, backupname):
-            super(narrowdirstate, self).clearbackup(tr, backupname)
-            narrowspec.clearbackup(self._opener, _narrowbackupname(backupname))
-
     dirstate.__class__ = narrowdirstate
     return dirstate



To: martinvonz, durin42, #hg-reviewers
Cc: mercurial-devel