Re: Cannot re-attach to screen session after screen-4.3.1-r1 to screen-4.4.0 upgrade

[Michael Parson]

On 2017-04-11 09:16, Martin MOKREJŠ wrote:
> Hi Amadeusz,
>
> Amadeusz Sławiński wrote:
> > On Tue, 11 Apr 2017 13:44:32 +0200
> > Martin MOKREJŠ <address@hidden> wrote:
> >
> > > Hi,
> > >   does anyone have a clue why I cannot re-attached to my existing 
> > > screen sessions after upgrade?
> > > I use "screeen -R $ID". What should I check?
> > > Thanks,
> > > Martin
> >
> > Hey,
> >
> > yes there is incompatibility between those versions, from release 
> > message 
> > (http://lists.gnu.org/archive/html/screen-devel/2016-06/msg00000.html)
> >
> > "Do note that there was fix to screen message structure field
> > responsible for $TERM handling, which makes it impossible to attach to
> > older versions (hence minor version bump)."
> >
> > You can try to attach by using /proc/$SCREENPID/exe -x
>
> I get permission denied. I got some new screen session when I executed
> it as root, but I certainly did not enter my user's session.
>
> I just opened https://bugs.gentoo.org/show_bug.cgi?id=615266 and asked
> for restoring of the 4.3.1-r1 version, at least for a while.
>
> I compiled manually from original tarball but it did not work as I
> cannot specify path to the directory with sockets on the command line.
>
> I have /tmp/screen/S-${username} but self-compiled vanilla screen
> looked for /tmp/uscreens/S-${username}. The Gentoo documentation says
> /var/run/screen/S-${username} and
> https://bugs.gentoo.org/show_bug.cgi?id=591772 proposes
> $HOME/.screen/.
>
> Seems easiest is to restore the package for the time being.

Try setting the env var SCREENDIR=/tmp/screen/S-${username}

You might need to remove the SUID bit from the screen binary first.

Check the man page for more info.

--
Michael Parson
Pflugerville, TX
KF5LGQ