Mercurial > hg-stable
changeset 18831:17f6644a2fbc
blackbox: defer opening a log file until needed (issue3869)
Previously, we opened the log file when creating a repo object. This
was inefficient (not all repo creation is going to result in a need to
log something), but more importantly it broke subrepo updates when used
on NFS.
* perform an update in the master repo that triggers a subrepo clone
* empty subrepo already exists, and has an open, empty blackbox.log file
due to it being opened eagerly/prematurely
* hg decides to blow away the skeletal subrepo (see use of shutil.rmtree
in subrepo._get)
* we crash, due to NFS treating a delete of an open file as really a
rename to a hidden ".nfs" file
Now that we open the blackbox log file on demand, no file exists at the
time the empty subrepo is deleted, so the above problem does not occur.
| author | Bryan O'Sullivan <bryano@fb.com> |
|---|---|
| date | Tue, 26 Mar 2013 16:27:51 -0700 |
| parents | 6b827d84d286 |
| children | a911e5dc2b00 |
| files | hgext/blackbox.py |
| diffstat | 1 files changed, 10 insertions(+), 6 deletions(-) [+] |
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--- a/hgext/blackbox.py Fri Mar 22 17:27:06 2013 -0500 +++ b/hgext/blackbox.py Tue Mar 26 16:27:51 2013 -0700 @@ -47,6 +47,15 @@ if util.safehasattr(self, '_blackbox'): blackbox = self._blackbox + elif util.safehasattr(self, '_bbopener'): + try: + self._blackbox = self._bbopener('blackbox.log', 'a') + except (IOError, OSError), err: + self.debug('warning: cannot write to blackbox.log: %s\n' % + err.strerror) + del self._bbopener + self._blackbox = None + blackbox = self._blackbox else: # certain ui instances exist outside the context of # a repo, so just default to the last blackbox that @@ -65,12 +74,7 @@ lastblackbox = blackbox def setrepo(self, repo): - try: - self._blackbox = repo.opener('blackbox.log', 'a') - except (IOError, OSError), err: - self.debug('warning: cannot write to blackbox.log: %s\n' % - err.strerror) - self._blackbox = None + self._bbopener = repo.opener ui.__class__ = blackboxui