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Date: Tue, 13 Aug 2019 21:24:22 +0300
From: Andrey Repin <anrdaemon@yandex.ru>
Reply-To: cygwin@cygwin.com
Message-ID: <1612836928.20190813212422@yandex.ru>
To: "Lavrentiev, Anton (NIH/NLM/NCBI) [C]" <lavr@ncbi.nlm.nih.gov>,
        cygwin@cygwin.com
Subject: Re: SMBFS mount's file cannot be made executable
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Greetings, Lavrentiev, Anton (NIH/NLM/NCBI) [C]!

>> You need the "exec" mount option.

> I thought so too, but how do I give that option to a drive that is
> "noumount".  I cannot dis- or re-mount it AFAICT.

> $ mount
> ...
> Z: on /cygdrive/z type smbfs (binary,posix=0,user,noumount,auto)
> $ umount /cygdrive/z
> umount: /cygdrive/z: Invalid argument

/cygdrive is automount.
What is your cygdrive mount options? Because default is, apparently, "binary,posix=0,user".

> Also, I tried to mount the same path elsewhere, and with the "exec"
> options, and that wouldn't help, either:

> $ mount -o exec //coredev2/home/lavr /mnt
> $ mount
> //coredev2/home/lavr on /mnt type smbfs (binary,exec,user)
> ...
> $ cd /mnt
> $ pwd
> /mnt
> $ gcc a.c
> $ ls -l a.exe
> -rw-rw-r--+ 1 lavr cppcore 157753 Aug 13 08:20 a.exe
> $ ./a.exe
> -bash: ./a.exe: Permission denied
> (and again, if a.exe is given the "x" perm in the Linux fs, the command above works)

> I think that something's wrong with how (or if) Cygwin translates the "x"
> unix execution permission bit to an ACL that is passed thru SMB -- it does
> not get transferred to the Linux side correctly.  But if set there, then it
> gets converted to the execute ACL the right way, and that makes the file
> executable on the Windows side...  I do not know how is it all implemented, though;  it's just my observation.


-- 
With best regards,
Andrey Repin
Tuesday, August 13, 2019 21:22:07

Sorry for my terrible english...


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