[PATCH 1 of 2] transaction: always remove empty journal on abort

[Sune Foldager]

# HG changeset patch
# User Sune Foldager <cryo at cyanite.org>
# Date 1256906393 -3600
# Node ID c276cf7e085b8d73753201e85967998d7f747a56
# Parent  9b127e8886400687e191e1b3bf26b502bfae40ce
transaction: always remove empty journal on abort

When transactions without entries were aborted, the journal (of size 0) was not
unlinked, which prevents subsequent operations until hg recover is run on the
repository.

We also make sure the journal is unlinked when committing, even if the provided
hook doesn't do so.

diff --git a/mercurial/transaction.py b/mercurial/transaction.py
--- a/mercurial/transaction.py
+++ b/mercurial/transaction.py
@@ -59,8 +59,7 @@
 
     def __del__(self):
         if self.journal:
-            if self.entries: self._abort()
-            self.file.close()
+            self._abort()
 
     @active
     def startgroup(self):
@@ -126,6 +125,8 @@
         self.entries = []
         if self.after:
             self.after()
+            if os.path.isfile(self.journal):
+                os.unlink(self.journal)
         else:
             os.unlink(self.journal)
         self.journal = None
@@ -141,7 +142,10 @@
         self.count = 0
         self.file.close()
 
-        if not self.entries: return
+        if not self.entries:
+            if self.journal:
+                os.unlink(self.journal)
+            return
 
         self.report(_("transaction abort!\n"))
 
diff --git a/tests/test-journal-exists b/tests/test-journal-exists
--- a/tests/test-journal-exists
+++ b/tests/test-journal-exists
@@ -3,6 +3,7 @@
 hg init
 echo a > a
 hg ci -Am0
+hg -q clone . foo
 
 touch .hg/store/journal
 
@@ -10,3 +11,10 @@
 hg ci -Am0
 
 hg recover
+
+echo % check that zero-size journals are correctly aborted
+hg bundle -qa repo.hg
+chmod -w foo/.hg/store/00changelog.i
+hg -R foo unbundle repo.hg 2>&1 | sed 's/\(abort: Permission denied\).*/\1/'
+ls foo/.hg/store/journal
+exit 0
diff --git a/tests/test-journal-exists.out b/tests/test-journal-exists.out
--- a/tests/test-journal-exists.out
+++ b/tests/test-journal-exists.out
@@ -6,3 +6,7 @@
 crosschecking files in changesets and manifests
 checking files
 1 files, 1 changesets, 1 total revisions
+% check that zero-size journals are correctly aborted
+adding changesets
+abort: Permission denied
+ls: cannot access foo/.hg/store/journal: No such file or directory