[Nix-dev] Minimal disk image without gcc?

[Wout Mertens]

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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-- 

Wout.
(typed on mobile, excuse terseness)
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