hg 5.2.2: abort: Permission denied: '..../.hg/wcache/.manifestfulltextcache-gc3hkx8o~'

[Alan Mackenzie]

Hello, Augie.

Sorry it's taken time to reply.  In a fit of madness I'd deleted dirstate
from several repositories to save space.  Finding out what I'd done and
fixing it (thank goodness for backups) has been a priority the last few
days.

On Wed, May 06, 2020 at 11:30:36 -0400, Augie Fackler wrote:


> > On Apr 29, 2020, at 3:01 AM, Alan Mackenzie <acm at muc.de> wrote:

> > I've worked out what it is.  It is the hg log that my regular backup
> > script does as root.  This wcache directory keeps coming back.

> > hg log, even as root, should surely not corrupt a repository.  It is
> > doing so here.

Apologies.  It was hg status, not hg log, which gives rise to the
problem.

> Nothing is corrupt. You’re getting some permission errors, which should
> probably be fixed using a sticky bit or something.

OK, let's just say the repo became unusable, with no obvious way to fix
it.

> > Now that I know what it is, I can implement workarounds.  But this is
> > ugly; it would be nice if it could be fixed properly.

> Can you reproduce this and add --traceback to the command? I’d be happy
> to try and patch hg so this doesn’t happen (we shouldn’t choke on
> permission errors when trying to read/write cache	files), but also
> know that this isn’t corruption - no data is at risk.

As root, I did cd ~acm/cc-mode.hg, and checked that there was no
.hg/wcache directory.  Then I did

    # hg status --traceback > foo.out 2> foo.err

.  There was only the command's output in foo.out and

    not trusting file /home/acm/cc-mode.hg/.hg/hgrc from untrusted user acm, group users
    not trusting file /home/acm/cc-mode.hg/.hg/hgrc from untrusted user acm, group users

in foo.err.  Should --traceback have produced anything more (I'm not
familiar with --traceback)?

And there is now a .hg/wcache directory owned by root with permissions
755, containing a single file checkisexec owned by root with permissions
711.

-- 
Alan Mackenzie (Nuremberg, Germany).