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Date: Sat, 15 Nov 2014 15:45:19 +0100
From: Christian Franke <Christian DOT Franke AT t-online DOT de>
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To: cygwin AT cygwin DOT com
Subject: Re: [ANNOUNCEMENT] TEST RELEASE: Cygwin 1.7.33-0.6
References: <545BD14A DOT 8080803 AT t-online DOT de> <20141106200635 DOT GP28195 AT calimero DOT vinschen DOT de> <20141106204222 DOT GQ28195 AT calimero DOT vinschen DOT de> <545C68BA DOT 3050007 AT t-online DOT de> <20141107101659 DOT GU28195 AT calimero DOT vinschen DOT de> <545D30DA DOT 9040507 AT t-online DOT de> <20141110105151 DOT GB2782 AT calimero DOT vinschen DOT de> <54611048 DOT 4000404 AT t-online DOT de> <20141110204500 DOT GB13071 AT calimero DOT vinschen DOT de> <5461AF09 DOT 5010809 AT t-online DOT de> <20141111113656 DOT GP2782 AT calimero DOT vinschen DOT de>
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Corinna Vinschen wrote:
>> The actual test scripts & tools from this use case pass local usernames
>> from/to non-Cygwin programs and rely on the fact that Cygwin and Windows
>> username match.
>>
>> For the long term, have some cyguser, cyggroup tools (similar to cygpath)
>> which convert the names would be helpful.
> Feel free to provide them.  I'm not quite sure what kind of conversion
> you're thinking about.  Cygwin->Windows?  If so, you can get that
> with simple scripts:
>
>    pwd_entry=$(/usr/bin/getent passwd "$username")
>    # Extract Windows username and domain
>    tmp="${pwd_entry#*:*:*:*U-}"
>    tmp="${pwd_entry%%,*}"
>    domain="${tmp%\\*}"
>    username="${tmp#*\\}"

Works, except when Cygwin does not provide a "U-*\NAME," in the gecos 
field. This is the case for Local Service, Network Service and 
Administrators.

Tested in db-only mode with 1.7.34-001:

   $ getent passwd localservice
   localservice:*:19:19:,S-1-5-19:/:/sbin/nologin


BTW, TrustedInstaller is not found by getent:

   $ getent passwd TrustedInstaller ; echo $?
   2

   $ getent passwd 328384 ; echo $?
   2

Same result for 'group'

but:

   $ ls -l -d /cygdrive/c/Windows
   drwxrwx---+ 1 TrustedInstaller TrustedInstaller 0 Nov 15 11:08 
/cygdrive/c/Windows

   $ ls -l -n -d /cygdrive/c/Windows
   drwxrwx---+ 1 328384 328384 0 Nov 15 11:08 /cygdrive/c/Windows

  $ getent passwd S-1-5-80-956008885-...
TrustedInstaller:*:328384:328384:,S-1-5-80-956008885-...:/:/sbin/nologin


What will be the future 'official' way for the opposite Windows->Cygwin 
conversion? Some tool that uses CW_CYGNAME_FROM_WINNAME ?

Christian


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