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Re: SegFault running "ls -l" after Microsoft Patch Day
- From: Dr Rainer Woitok <rainer dot woitok at gmail dot com>
- To: cygwin at cygwin dot com
- Date: Fri, 18 Dec 2015 14:06:26 +0100
- Subject: Re: SegFault running "ls -l" after Microsoft Patch Day
- Authentication-results: sourceware.org; auth=none
- References: <20151216164758 dot GL3507 at calimero dot vinschen dot de>
Corinna,
On Wednesday, 2015-12-16 17:47:58 +0100, you wrote:
> ...
> > Since my "/etc/passwd" file
> > uses more Unix like names even for the typical Windows accounts,
>
> Which doesn't make much sense from my POV, but, anyway.
Well, from my point of view it does. My game is to have an as Unix like
environment as possible on Windows, rather than allowing Windows to
teach Unix that user or group names are as long as tape worms and (of
all things!) contain blanks, as in, for instance, "NT SERVICE+TrustedIn-
staller", "Medium Mandatory Level", "NTLM Authentication", and so on.
If you started to write Unix scripts in the days before a certain com-
pany named "Microsoft" was even founded, and if you developed the habit
of processing output from commands like "ls -l" or "id" by using runs of
blanks as field separators, and if you still have some of these scripts
around, and even write new ones still using this habit, you'll probably
know how anoying these Window-isms can be.
By basically using
mkpasswd -l | sed '...' > /etc/passwd
mkgroup -l | sed '...' > /etc/group
to roll my own versions of "/etc/passwd" and "/etc/group" I do nothing
more then using blankless and rather short names for users and groups.
And the only purpose of these terminating "other:" lines in both files
was to abbreviate "Unknown+User" and "Unknown+Group" to "other". So I'm
not hiding any real information, as you put it, I'm just keeping the
string conveying this information Unix like, that is, short.
My approach of appending these "other:" lines to the "password" and
"group" files may well be "illegal" and may well break things in Cygwin
(though up to last Patch Day it didn't), so is there an official way to
change "Unknown+User" and "Unknown+Group" to "other" and -- while we are
talking about it -- to change "4095(CurrentSession)" in the output of
the "id" command to something shorter? Currently, the latter is the on-
ly string I didn't yet manage to change by fiddling around with "/etc/
group" (yes, it's blank free, but it's by far too long).
> ...
> The questions you should ask yourself: Why are there SIDs unknown to
> Cygwin, despite Cygwin fetching account info directly from Windows?
No, that never was the question because the answer is obvious. For me
the question always has been how to change these strings into something
less in the way of fitting the output of "ls -l" into an XEmacs or term-
inal window traditionally eighty characters wide.
> Apart from the explanation in
> https://cygwin.com/cygwin-ug-net/ntsec.html#ntsec-mapping-how
When Cygwin introduced this mapping some years ago, above URL contained
most of the information I needed to remove unwanted blanks from the out-
put of the "id" command by adding additional groups to "/etc/group".
Thank you for that. Just for the record: this description fails to ex-
plain the conversion of "NT SERVICE+TrustedInstaller" (also known as "S-
1-5-80-V-W-X-Y-Z") to "328384".
> ...
> I applied a fix and uploaded a new developer snapshot to
> https://cygwin.com/snapshots/ and created a new test release 2.4.0-0.11
> for testing. Please give any of them a try.
Sure. I've already downloaded "cygwin1-20151216.dll.xz" and will test
it and report back as soon as time permits.
Sincerely,
Rainer
----------------------------------------------------------------------
| Rainer M Woitok | Phone : (+49 60 93) 487 95 95 |
| Kolpingstraße 3 | Mobile: (+49 172) 813 6 831 |
| D-63846 Laufach | Mail : Rainer.Woitok@Gmail.Com |
| Germany | |
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