Documentation on fstab out of date

Documentation on fstab out of date

[David Macek]

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Hi. It seems to me that <https://cygwin.com/cygwin-ug-net/using.html#mount-table> is out of sync with actual Cygwin behaviour in few aspects. What's the established process on updating these docs? List of issues I found follows.

> Recognized options are binary, text, nouser, user, exec, notexec, cygexec, nosuid, posix=[0|1]. The meaning of the options is as follows.

There are more options, as can be seen below the cited paragraph.

> Files ending in certain extensions (.exe, .com, .bat, .btm, .cmd) are assumed to be executable.

My reading of fhandler_disk_file.cc suggests it's only .exe, .com, and .lnk these days.

Interestingly, nt_path_has_executable_suffix (only used in the rename syscall, AFAICT) looks for a different set of suffixes (.com, .dll, .exe, .scr, .sys).

> Files whose first two characters begin with '#!' are also considered to be executable.

According to has_exec_chars, the sniffing routine also looks for "MZ" (EXE/PE files) and ":\n" (batch files? (can anyone confirm this?)).

-- 
David Macek


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Re: Documentation on fstab out of date

[Steven Penny]

On Sat, Apr 18, 2015 at 9:47 AM, David Macek wrote:
> According to has_exec_chars, the sniffing routine also looks for "MZ" (EXE/PE
> files) and ":\n" (batch files? (can anyone confirm this?)).

Yeah, I can confirm that it does nothing.

    $ touch alpha.sh bravo.sh charlie.bat delta.bat

    $ echo '#!/bin/sh' > bravo.sh

    $ echo : > delta.bat

    $ file *
    alpha.sh:    empty
    bravo.sh:    POSIX shell script, ASCII text executable
    charlie.bat: empty
    delta.bat:   ASCII text

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Re: Documentation on fstab out of date

[David Macek]

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On 18. 4. 2015 19:21, Steven Penny wrote:
> On Sat, Apr 18, 2015 at 9:47 AM, David Macek wrote:
>> According to has_exec_chars, the sniffing routine also looks for "MZ" (EXE/PE
>> files) and ":\n" (batch files? (can anyone confirm this?)).
> 
> Yeah, I can confirm that it does nothing.

AFAIK `file` doesn't consult this routine in any way. Try this instead:

$ mount "$(cygpath -m "$TMP")" /home -o noacl
$ cd /home
$ touch alpha.sh bravo.sh charlie.bat delta.bat
$ echo '#!/bin/sh' > bravo.sh
$ echo : > delta.bat
$ ls -l
-rw-r--r-- 1 me None        0 Apr 18 20:53 alpha.sh
-rwxr-xr-x 1 me None       10 Apr 18 20:53 bravo.sh
-rw-r--r-- 1 me None        0 Apr 18 20:53 charlie.bat
-rwxr-xr-x 1 me None        2 Apr 18 20:53 delta.bat

-- 
David Macek


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Re: Documentation on fstab out of date

[Corinna Vinschen]

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On Apr 18 16:47, David Macek wrote:
> Hi. It seems to me that
> <https://cygwin.com/cygwin-ug-net/using.html#mount-table> is out of
> sync with actual Cygwin behaviour in few aspects. What's the
> established process on updating these docs? List of issues I found
> follows.

As you did on cygwin-patches :)


Thanks,
Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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