[lfs-support] Getting <su> in Chapter 5 [SOLVED]

Bruce Dubbs bruce.dubbs at gmail.com
Tue Oct 8 09:33:04 PDT 2013

Dan McGhee wrote:
> On 10/07/2013 08:33 PM, Bruce Dubbs wrote:
>> Ken Moffat wrote:
>>> On Mon, Oct 07, 2013 at 11:59:00PM +0100, Ken Moffat wrote:
>>>>     The usual way to look at what gets installed is to run 'make
>>>> DESTDIR=/path/to/somewhere install [ optional args ]' - once you get
>>>> into DESTDIR installs for looking at what is installed you will find
>>>> some packages use other variables (often INSTALLROOT or something
>>>> like that) - if shadow is such a package,then running *as a user*
>>>> will fail.  So try it as a user, to a directory which that user can
>>>> write to.
>>>     OK, so you can't try a DESTDIR install as a normal user because you
>>> are root and 'su' doesn't exist.  Build outside the new system as
>>> user lfs and do a DESTDIR, e.g. to /home/lfs/somewhere or
>>> /tmp/somewhere.  The same for su from old coreutils (my notes show
>>> that I had to build all of coreutils to get su linked - there might
>>> be a shorter series of commands - but NOT which old version of
>>> coreutils last contained 'su'.
>> If the only thing needed is su, then I'd build shadow with:
>> ./configure && make && cp src/su /tools/bin
>> It doesn't need to be suid since it's run by root.

> Thanks to you both. Ken, I had forgotten about DESTDIR and was able to
> refresh my memory.
> I have su now in the tool chain. I won't need it until I get to CH. 6,
> but with my OCD kicking in I wanted to build it just after coreutils in
> CH. 5. I suppose it doesn't really make any difference, but...
> Bruce, I've forgotten the "ins and outs" of login vs. nonlogin shells,
> but in the package user system su is used to go from 'root' to 'pkgusr.'
> Of course, then, it's run by root, but I have also used it to go from
> 'pkgusr' to 'root' so I don't have to keep logging in. The test for this
> build will occur when I get to Ch. 6.

I don't use the pkgusr technique.  I just use jhalfs.  That said,  I 
think I'd install sudo from blfs just before chapter 6 for doing what 
you want.  The syntax is easier and it can be set to not request a 
password.  To use it, you would need to wait until after section 6.6.

   -- Bruce

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