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Date:	Thu, 5 Jun 2025 14:49:37 +0200 (CEST)
To:	Robert Fensterman <minnmass AT gmail DOT com>
cc:	cygwin AT cygwin DOT com
Subject:	Re: cygin 3.6.2-1 under Win11 24H2: Cannot launch: no available
	terminals
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From:	Johannes Schindelin via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Johannes Schindelin <Johannes DOT Schindelin AT gmx DOT de>
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X-MIME-Autoconverted:	from base64 to 8bit by delorie.com id 555CoxrK1719827

Hi Robert,

this patch has now been released as Cygwin v3.6.3. Would you kindly verify
that it fixes your problem?

Thanks,
Johannes

On Mon, 2 Jun 2025, Johannes Schindelin wrote:

> Hi Robert,
> 
> On Wed, 28 May 2025, Robert Fensterman wrote:
> 
> > getent passwd %USERNAME%
> > is blank
> 
> I _think_ that you are running this in a Bash, therefore you'd need to run
> `getent passwd $USER`.
> 
> As it were, I did reproduce the issue on my end, and this command-line
> reports a SID that starts with `S-1-12-1`. Together with this information:
> 
> > With cygwin 3.6.2-1, I can start bash directly from a CMD window (though it
> > can't find programs, just built-ins).
> > Interestingly: after that test, that and reverting back to .1, my
> > .bash_history permissions seem to be wrong: instead of my AzureAD user as
> > the owner, Windows sees some other SID as owning the file and bash (in
> > cygwin) can't read it (eg., up-arrow doesn't go up past the start of the
> > instance of the shell, where it normally goes quite a bit further back in
> > time). As a workaround, I've given "everyone" rwx permissions, and it seems
> > to be working fine.
> 
> and bisecting my problem to
> https://github.com/cygwin/cygwin/commit/48e7d632689313106d16b0de035fb955c54492b2,
> the following diff (which partially reverts that commit) fixes it for me:
> 
> ```diff
> diff --git a/winsup/cygwin/uinfo.cc b/winsup/cygwin/uinfo.cc
> index 83883f9f65..795a00cc1a 100644
> --- a/winsup/cygwin/uinfo.cc
> +++ b/winsup/cygwin/uinfo.cc
> @@ -1996,10 +1996,12 @@ pwdgrp::fetch_account_from_windows (fetch_user_arg_t &arg, cyg_ldap *pldap)
>        if (sid_id_auth (sid) == 5 /* SECURITY_NT_AUTHORITY */
>  	  && sid_sub_auth (sid, 0) == SECURITY_APPPOOL_ID_BASE_RID)
>  	break;
> +#if 0
>        /* AzureAD SIDs */
>        if (sid_id_auth (sid) == 12 /* AzureAD ID */
>  	  && sid_sub_auth (sid, 0) == 1 /* Azure ID base RID */)
>  	break;
> +#endif
>        /* Samba user/group SIDs */
>        if (sid_id_auth (sid) == 22)
>  	break;
> ```
> 
> Now, the commit message of that commit includes the name of the reporter,
> which helped me find
> https://inbox.sourceware.org/cygwin/pbli6jecn5go2h7heebwivkwz6xf5h2stvq5fxna4u6pql6uht AT 7xpentpxjiak/
> as the original reason for that commit. That request only talked about
> `S-1-15-3-*`, though, and not about `S-1-12-1-*`. And the commit message
> makes it sound as if my SID would never resolve by `LookupAccountSid()`,
> but it clearly does.
> 
> So I am not quite sure what to make of this finding... Should the
> `S-1-12-1-*` part of 48e7d63268 (Cygwin: fetch_account_from_windows: skip
> LookupAccountSid for SIDs known to fail, 2025-04-10) simply be dropped? Or
> was there another clever idea to exploit a shortcut that would side-step
> the need to call `LookupAccountSid()` for those SIDs and set `ret = TRUE`?
> 
> Puzzled,
> Johannes
> 
> > 
> > On Wed, May 28, 2025 at 5:50 AM Andrey Repin <anrdaemon AT yandex DOT ru> wrote:
> > 
> > > Greetings, Robert Fensterman!
> > >
> > > > When I try to launch Cygwin 3.6.2-1 - be it from the taskbar shortcut,
> > > > double-clicking on mintty.exe, or running mintty.exe from CMD - I get an
> > > > error message:
> > >
> > > >> Error: Could not fork child process: There are no available terminals
> > > (-1)
> > >
> > > > The resulting window is titled "-nologin".
> > >
> > > What's your /etc/shells and what is the output of `getent passwd
> > > %USERNAME%` ?
> > > Can you start bash.exe directly?
> > >
> > > > The taskbar shortcut is:
> > > >> C:\cygwin64\bin\mintty.exe -i /Cygwin-Terminal.ico -
> > >
> > > > I ran setup this morning to update whatever had updates; this included
> > > the
> > > > base cygwin package. As last week, it warned me that there was a point
> > > > update; I've since downloaded that and re-run setup (without reverting
> > > > anything; just letting it do its normal cleanup) to no avail. I've
> > > attached
> > > > the portion of setup.log with those two runs.
> > >
> > > > I did also update several other Windows apps Windows first thing this
> > > > morning, before I'd tried to open a Cygwin terminal; I don't recall that
> > > > list including anything that should have affected terminals, but I
> > > suppose
> > > > it's possible.
> > >
> > > > Google searches suggest killing several programs (ssh, ssh-agent, bash,
> > > sh,
> > > > git, node etc.); none are running. I have tried rebooting a couple of
> > > > times, launching Cygwin (from the taskbar shortcut) as soon as I can
> > > after
> > > > reboot, and I still get the error.
> > >
> > > > Other terminal-ey apps work: git-bash launches and appears to work
> > > > normally; similarly, CMD and PowerShell both seem to be just fine.
> > >
> > > > Reverting to v 3.6.1-1 seems to work: Cygwin launches and is acting
> > > > normally. Updating cygwin through the current version of setup results in
> > > > the same error condition (and, reverting a second time is still working).
> > >
> > > > Running on Win11 24H2 (OS Build 26100.4061).
> > >
> > >
> > >
> > > --
> > > With best regards,
> > > Andrey Repin
> > > Wednesday, May 28, 2025 13:20:56
> > >
> > > Sorry for my terrible english...
> > >
> > >
> > 
> > -- 
> > Robert F.
> > 

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