[PATCH] base-files-4.0.6: Change prompt if running with admin rights
Christian Franke
Christian.Franke@t-online.de
Wed Apr 27 06:41:00 GMT 2011
Daniel Colascione wrote:
> On 4/24/11 9:39 AM, Christian Franke wrote:
>
>> On 2011-04-01, Christian Franke wrote:
>>
>>> The attached patch for /etc/profile and /etc/bash.bashrc sets a root
>>> prompt ('#' instead of '$' or '%') if the shell runs with admin rights
>>> (local or domain admin group).
>>>
>>>
>> Any comment so far? Wrong list ?
>>
>
> I like the idea, but your patch adds two subprocess invocations to the
> shell startup path. Each one takes ~200ms, and we can't afford to add
> any more.
>
>
Agree.
> Instead of examining the group list, you can use something like
>
> local isadmin=0
> [[ -w / ]]&& isadmin=1
>
>
False positive if same user installed Cygwin by running setup.exe with
admin rights.
[[...]] does not work with posh and dash. But all shells apparently have
a builtin '[' command.
> or
>
> local isadmin=0
> [[ -w /cygdrive/c ]]&& isadmin=1
>
>
False positive if /cygdrive is mounted with 'noacl' option.
> Of course, that test assumes that only "administrators" can write to the
> drive root, and that's an imperfect proxy for administrative rights. You
> get the idea though: try to perform the test in pure bash code.
>
>
Using a read access test on a registry key with SYSTEM only access might
work in most cases:
[ -r /proc/registry/HKEY_LOCAL_MACHINE/SECURITY ] && isadmin=1
Test succeeds if SeBackupPrivilege is enabled which is the case for
Cygwin processes if user is in admin group or another group with this
privilege.
A test script for all shells is attached. Run with admin rights.
Requires cygdrop from cygutils package.
Script produces a false negative only from dash. Not really an issue, as
dash is normally not used interactively.
Christian
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