blackbox: just try writing to repo.vfs and update lastlogger on success

blackbox: just try writing to repo.vfs and update lastlogger on success

This is simpler and more robust. Before, an empty ".hg" directory would be
created if it's removed after checking vfs.isdir('.').

--- a/hgext/blackbox.py	Tue Nov 20 22:31:12 2018 +0900
+++ b/hgext/blackbox.py	Sat Nov 17 22:10:27 2018 +0900
@@ -121,7 +121,7 @@
                            newpath='%s.%d' % (path, i))
                 rotate(oldpath=path,
                        newpath=maxfiles > 0 and path + '.1')
-    return vfs(name, 'a')
+    return vfs(name, 'a', makeparentdirs=False)
 
 class proxylogger(object):
     """Forward log events to another logger to be set later"""
@@ -143,22 +143,10 @@
         self._repo = repo
         self._trackedevents = set(ui.configlist('blackbox', 'track'))
 
-    @property
-    def _bbvfs(self):
-        vfs = self._repo.vfs
-        if not vfs.isdir('.'):
-            vfs = None
-        return vfs
-
     def tracked(self, event):
         return b'*' in self._trackedevents or event in self._trackedevents
 
     def log(self, ui, event, msg, opts):
-        if self._bbvfs:
-            _lastlogger.logger = self
-        else:
-            return
-
         default = ui.configdate('devel', 'default-date')
         date = dateutil.datestr(default, ui.config('blackbox', 'date-format'))
         user = procutil.getuser()
@@ -178,13 +166,15 @@
         try:
             fmt = '%s %s @%s%s (%s)%s> %s'
             args = (date, user, rev, changed, pid, src, msg)
-            with _openlogfile(ui, self._bbvfs) as fp:
+            with _openlogfile(ui, self._repo.vfs) as fp:
                 fp.write(fmt % args)
         except (IOError, OSError) as err:
             # deactivate this to avoid failed logging again
             self._trackedevents.clear()
             ui.debug('warning: cannot write to blackbox.log: %s\n' %
                      encoding.strtolocal(err.strerror))
+            return
+        _lastlogger.logger = self
 
 def uipopulate(ui):
     ui.setlogger(b'blackbox', _lastlogger)

--- a/tests/test-blackbox.t	Tue Nov 20 22:31:12 2018 +0900
+++ b/tests/test-blackbox.t	Sat Nov 17 22:10:27 2018 +0900
@@ -327,6 +327,29 @@
 cleanup
   $ cd ..
 
+Test missing log directory, which shouldn't be created automatically
+
+  $ cat <<'EOF' > closeremove.py
+  > def reposetup(ui, repo):
+  >     class rmrepo(repo.__class__):
+  >         def close(self):
+  >             super(rmrepo, self).close()
+  >             self.ui.debug(b'removing %s\n' % self.vfs.base)
+  >             self.vfs.rmtree()
+  >     repo.__class__ = rmrepo
+  > EOF
+
+  $ hg init gone
+  $ cd gone
+  $ cat <<'EOF' > .hg/hgrc
+  > [extensions]
+  > closeremove = ../closeremove.py
+  > EOF
+  $ hg log --debug
+  removing $TESTTMP/gone/.hg
+  warning: cannot write to blackbox.log: $ENOENT$
+  $ cd ..
+
 #if chg
 
 when using chg, blackbox.log should get rotated correctly