Re: [gentoo-user] Making a init thingy. Step two I guess.

[Mark Knecht <markknecht@gmail.com>]

On Sat, Sep 17, 2011 at 2:17 PM, Dale <rdalek1967@gmail.com> wrote:
> Mark Knecht wrote:
>>
>> On Sat, Sep 17, 2011 at 1:51 PM, Michael Mol<mikemol@gmail.com>  wrote:
>>>
>>> On Sat, Sep 17, 2011 at 4:44 PM, Dale<rdalek1967@gmail.com>  wrote:
>>>>
>>>> Mark Knecht wrote:
>>>>>
>>>>> On Sat, Sep 17, 2011 at 1:02 PM, Dale<rdalek1967@gmail.com>    wrote:
>>>>
>>>> That's what I was thinking to.  I know busybox does a LOT of things but
>>>> I
>>>> didn't think it was a nano replacement either.  OK.  I got both of those
>>>> in
>>>> there at least.  First problem dealt with I guess.  Wonder what else I
>>>> should put in there too.<  scratches head>
>>>
>>> Anything that makes life convenient, I'd guess.
>>>
>>> I'd look at stuffing these in there:
>>> * screen
>>> * file
>>> * ssh
>>> * links/lynx/w3m
>>>
>>> You'd also need the .so files those depend on. I don't know how to
>>> identify those.
>>>
>>> --
>>> :wq
>>>
>>>
>> Supposedly
>>
>> ldd /usr/bin/screen
>> ldd /usr/bin/file
>> ldd /usr/bin/ssh
>>
>> etc.
>>
>> I think that's what I did when I built one a while back...
>>
>> - Mark
>>
>>
>
> Yep, that's how the howto says it too.  It seems to work.
>
> root@fireball / # ldd /bin/nano
>        linux-vdso.so.1 =>  (0x00007fffc25ff000)
>        libncursesw.so.5 => /lib64/libncursesw.so.5 (0x00007f25fb500000)
>        libc.so.6 => /lib64/libc.so.6 (0x00007f25fb171000)
>        libdl.so.2 => /lib64/libdl.so.2 (0x00007f25faf6d000)
>        /lib64/ld-linux-x86-64.so.2 (0x00007f25fb75f000)
> root@fireball / #
>
> So, I copied those over too.
>
> Adding ssh and screen are good ideas.  I very rarely use file.  Still might
> tho. Interesting:
>
> root@fireball / # ldd /usr/bin/screen
>        linux-vdso.so.1 =>  (0x00007fffe1573000)
>        libcrypt.so.1 => /lib64/libcrypt.so.1 (0x00007f921dfca000)
>        libncursesw.so.5 => /lib64/libncursesw.so.5 (0x00007f921dd6b000)
>        libpam.so.0 => /lib64/libpam.so.0 (0x00007f921db5c000)
>        libc.so.6 => /lib64/libc.so.6 (0x00007f921d7cd000)
>        libdl.so.2 => /lib64/libdl.so.2 (0x00007f921d5c9000)
>        /lib64/ld-linux-x86-64.so.2 (0x00007f921e230000)
> root@fireball / # ldd /usr/bin/ssh
>        linux-vdso.so.1 =>  (0x00007fffc6bff000)
>        libcrypto.so.1.0.0 => /usr/lib64/libcrypto.so.1.0.0
> (0x00007ff6aa7b9000)
>        libdl.so.2 => /lib64/libdl.so.2 (0x00007ff6aa5b5000)
>        libz.so.1 => /lib64/libz.so.1 (0x00007ff6aa39d000)
>        libresolv.so.2 => /lib64/libresolv.so.2 (0x00007ff6aa186000)
>        libpthread.so.0 => /lib64/libpthread.so.0 (0x00007ff6a9f69000)
>        libc.so.6 => /lib64/libc.so.6 (0x00007ff6a9bda000)
>        /lib64/ld-linux-x86-64.so.2 (0x00007ff6aab73000)
> root@fireball / #
>
> Those seem to have a bit in common and no static flag for either.
>
> Dale

While I was out walking my dog I sort of remembered that there are
just a few apps I had to build static, or at least that I build
static. One, I think was grub. The first and only time I did it I had
to do it 3 or 4 times before I got everything I needed working
correctly. This page which is like the first one Google comes up with
talks about that stuff, although you have to sort of dig it out and
read between the lines.

http://en.gentoo-wiki.com/wiki/Initramfs

And, I think with the ldd command as long as you include the libraries
ldd points at in your equivalent /lib directory within the initramfs
then that works for most apps and keeps the initramfs smaller.

HTH,
Mark