changeset 26631:e077ce385609

localrepo: restore dirstate to one before rollbacking if not parent-gone 'localrepository.rollback()' explicilty restores dirstate, only if at least one of current parents of the working directory is removed at rollbacking (a.k.a "parent-gone"). After DirstateTransactionPlan, 'dirstate.write()' will cause marking '.hg/dirstate' as a file to be restored at rollbacking. https://mercurial.selenic.com/wiki/DirstateTransactionPlan Then, 'transaction.rollback()' restores '.hg/dirstate' regardless of parents of the working directory at that time, and this causes unexpected dirstate changes if not "parent-gone" (e.g. "hg update" to another branch after "hg commit" or so, then "hg rollback"). To avoid such situation, this patch restores dirstate to one before rollbacking if not "parent-gone". before: b1. restore dirstate explicitly, if "parent-gone" after: a1. save dirstate before actual rollbacking via dirstateguard a2. restore dirstate via 'transaction.rollback()' a3. if "parent-gone" - discard backup (a1) - restore dirstate from 'undo.dirstate' a4. otherwise, restore dirstate from backup (a1) Even though restoring dirstate at (a3) after (a2) seems redundant, this patch keeps this existing code path, because: - it isn't ensured that 'dirstate.write()' was invoked at least once while transaction running If not, '.hg/dirstate' isn't restored at (a2). In addition to it, rude 3rd party extension invoking 'dirstate.write()' without 'repo' while transaction running (see subsequent patches for detail) may break consistency of a file backup-ed by transaction. - this patch mainly focuses on changes for DirstateTransactionPlan Restoring dirstate at (a3) itself should be cheaper enough than rollbacking itself. Redundancy will be removed in next step. Newly added test is almost meaningless at this point. It will be used to detect regression while implementing delayed dirstate write out.
author FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
date Tue, 13 Oct 2015 12:25:43 -0700
parents 3111b45a2bbf
children 59b5e8844eb0
files mercurial/localrepo.py tests/test-import.t
diffstat 2 files changed, 29 insertions(+), 5 deletions(-) [+]
line wrap: on
line diff
--- a/mercurial/localrepo.py	Wed Oct 14 02:40:04 2015 +0900
+++ b/mercurial/localrepo.py	Tue Oct 13 12:25:43 2015 -0700
@@ -11,7 +11,7 @@
 import changelog, dirstate, filelog, manifest, context, bookmarks, phases
 import lock as lockmod
 import transaction, store, encoding, exchange, bundle2
-import scmutil, util, extensions, hook, error, revset
+import scmutil, util, extensions, hook, error, revset, cmdutil
 import match as matchmod
 import merge as mergemod
 import tags as tagsmod
@@ -1084,20 +1084,22 @@
             lock.release()
 
     def rollback(self, dryrun=False, force=False):
-        wlock = lock = None
+        wlock = lock = dsguard = None
         try:
             wlock = self.wlock()
             lock = self.lock()
             if self.svfs.exists("undo"):
-                return self._rollback(dryrun, force)
+                dsguard = cmdutil.dirstateguard(self, 'rollback')
+
+                return self._rollback(dryrun, force, dsguard)
             else:
                 self.ui.warn(_("no rollback information available\n"))
                 return 1
         finally:
-            release(lock, wlock)
+            release(dsguard, lock, wlock)
 
     @unfilteredmethod # Until we get smarter cache management
-    def _rollback(self, dryrun, force):
+    def _rollback(self, dryrun, force, dsguard):
         ui = self.ui
         try:
             args = self.vfs.read('undo.desc').splitlines()
@@ -1140,6 +1142,9 @@
         parentgone = (parents[0] not in self.changelog.nodemap or
                       parents[1] not in self.changelog.nodemap)
         if parentgone:
+            # prevent dirstateguard from overwriting already restored one
+            dsguard.close()
+
             self.vfs.rename('undo.dirstate', 'dirstate')
             try:
                 branch = self.vfs.read('undo.branch')
--- a/tests/test-import.t	Wed Oct 14 02:40:04 2015 +0900
+++ b/tests/test-import.t	Tue Oct 13 12:25:43 2015 -0700
@@ -428,6 +428,25 @@
   working directory now based on revision 0
   $ hg --cwd b parents --template 'parent: {rev}\n'
   parent: 0
+
+Test that "hg rollback" doesn't restore dirstate to one at the
+beginning of the rollbacked transaction in not-"parent-gone" case.
+
+invoking pretxncommit hook will cause marking '.hg/dirstate' as a file
+to be restored at rollbacking, after DirstateTransactionPlan (see wiki
+page for detail).
+
+  $ hg --cwd b branch -q foobar
+  $ hg --cwd b commit -m foobar
+  $ hg --cwd b update 0 -q
+  $ hg --cwd b import ../patch1 ../patch2 --config hooks.pretxncommit=true
+  applying ../patch1
+  applying ../patch2
+  $ hg --cwd b update -q 1
+  $ hg --cwd b rollback -q
+  $ hg --cwd b parents --template 'parent: {rev}\n'
+  parent: 1
+
   $ rm -r b