[Nix-dev] Minimal disk image without gcc?

[Wout Mertens]

BTW, that reminds me of https://github.com/NixOS/nixpkgs/issues/12898

On Tue, Apr 19, 2016 at 12:50 PM Wout Mertens <wout.mertens at gmail.com>
wrote:

> Thanks, that really helps!
>
> On Tue, Apr 19, 2016 at 12:21 PM Layus <layus.on at gmail.com> wrote:
>
>> On 19/04/16 11:52, Wout Mertens wrote:
>> > Hi,
>> >
>> > I would like to make a specialized image that just runs some tools and
>> > has nothing else installed.
>> >
>> > If I uset the minimal profile it has stdenv, which includes 100MB of
>> gcc.
>> >
>> > Pointers?
>> I am also working on this. From my investigations, the closure-size
>> feature has everything required to get rid of gcc.out (and keep gcc.lib
>> if required).
>> However, many packages are not correctly stripped or somehow maintain a
>> reference to build inputs like gcc.
>>
>> To benefit from this feature, you need to build from master.
>> If your closure still includes some gcc-X.Y.Z (gcc-X.Y.Z-lib is ok),
>> here are some hints to track the misbehaving package.
>>
>>
>> You need to find package depending on gcc, then find why they have
>> runtime dependencies on their compiler.
>>
>> $ nix-store -qR ./result | grep gcc
>> /nix/store/ikzdbd65z7453spdvm05r0izd56zdvkx-gcc-4.9.3 <- you want to get
>> rid of this one.
>> ...
>>
>> $ blame () {comm -12 <(nix-store -qR "$1" | sort) <(nix-store -q
>> --referrers "$2" | sort); }
>> $ blame ./result /nix/store/ikzdbd65z7453spdvm05r0izd56zdvkx-gcc-4.9.3
>> /nix/store/rdp4z92qb7jr082pfl5b7jxwiiv3pic0-cups-2.1.3/
>> ... # (All these packages have runtime dependencies on gcc binaries.)
>>
>> Now you can try to investigate why they do depend on the full gcc.
>> It is probably an unstripped binary, or a wrong rpath.
>> Sometimes, the package keeps track of its buld flags, as mongo does for
>> its --version info.
>>
>> $ grep /nix/store/ikzdbd65z7453spdvm05r0izd56zdvkx-gcc-4.9.3 -r
>> /nix/store/rdp4z92qb7jr082pfl5b7jxwiiv3pic0-cups-2.1.3 -al
>> /nix/store/rdp4z92qb7jr082pfl5b7jxwiiv3pic0-cups-2.1.3/bin/ppdhtml
>> /nix/store/rdp4z92qb7jr082pfl5b7jxwiiv3pic0-cups-2.1.3/bin/ppdc
>> /nix/store/rdp4z92qb7jr082pfl5b7jxwiiv3pic0-cups-2.1.3/bin/ppdpo
>> /nix/store/rdp4z92qb7jr082pfl5b7jxwiiv3pic0-cups-2.1.3/bin/ppdmerge
>> /nix/store/rdp4z92qb7jr082pfl5b7jxwiiv3pic0-cups-2.1.3/bin/ppdi
>>
>> /nix/store/rdp4z92qb7jr082pfl5b7jxwiiv3pic0-cups-2.1.3/lib/cups/daemon/cups-driverd
>>
>> /nix/store/rdp4z92qb7jr082pfl5b7jxwiiv3pic0-cups-2.1.3/lib/libcupsppdc.so.1
>>
>> Now you can simply fix the derivations of these packages and get rif of
>> gcc.
>>
>> Layus.
>>
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>> nix-dev at lists.science.uu.nl
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>>
> --
>
> Wout.
> (typed on mobile, excuse terseness)
>
-- 

Wout.
(typed on mobile, excuse terseness)
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