[Nix-dev] sbcl image executables corrupted

[Eike]

I just tried putting the executable file inside a different directory
than 'bin' and this is working. It is not stripped/whatever -- only when
installed in the bin/ directory. Sorry about the confusion with
patchelf, I shouldn't put a wild guess in the title. It probably hasn't
anything to do with this problem. But I find these to lines in the
output of nix-build suspicious:

    patching ELF executables and libraries in /nix/store/2rhdmlbiklrrsh660ix0db415xyi46wn-hello-0.0.1
    stripping (with flags -S) in /nix/store/2rhdmlbiklrrsh660ix0db415xyi46wn-hello-0.0.1/bin

and one of it starts with "patching ELF...". I don't know what's going
on here. Any hints are much appreciated.

Thanks and regards
Eike

Eike <eike at eknet.org> writes:

> Hi there,
>
> I'm making a program in common lisp using sbcl. I then create a
> executable image which results in quite a big file since the whole lisp
> is packaged up. When I use nix to build this app, the file that ends up
> in nix-store is tiny and not working. It seems to me that the patch-elf
> process is stripping things off, but that's just a guess.
>
> Here is a mini example. Install sbcl and do this
>
> $ echo '(defun main () (format t "Hello World!~%"))' > hello.lisp
> $ sbcl --load hello.lisp --eval '(sb-ext:save-lisp-and-die "hello" :toplevel (lambda() (main) 0) :executable t)'
>
> then there is a 'hello' executable with about 50mb. Running it prints
> the message to stdout.
>
> The same process in a 'hello/default.nix' like this:
>
>     { pkgs ? import <nixpkgs> {} }:
>     pkgs.stdenv.mkDerivation {
>       name = "hello-0.0.1";
>       src = ./.;
>       buildPhase = ''
>         echo '(defun main () (format t "Hello World!~%"))' > hello.lisp
>         ${pkgs.sbcl}/bin/sbcl --load hello.lisp --eval '(sb-ext:save-lisp-and-die "hello" :toplevel (lambda() (main) 0) :executable t)'
>         ls -lha *
>       '';
>       installPhase = ''
>         mkdir -p $out/bin
>         cp hello $out/bin
>       '';
>     }
>
> Building it with 'nix-build hello' produces this:
>
>     these derivations will be built:
>       /nix/store/7f6dp34myppgf3r0nfkdcxkinwp81g16-hello-0.0.1.drv
>     building path(s) ‘/nix/store/2rhdmlbiklrrsh660ix0db415xyi46wn-hello-0.0.1’
>     building /nix/store/2rhdmlbiklrrsh660ix0db415xyi46wn-hello-0.0.1
>     unpacking sources
>     unpacking source archive /nix/store/dxk9zf3zd78j63g8ysbfsnmwwsf1gb02-hello
>     source root is hello
>     patching sources
>     configuring
>     no configure script, doing nothing
>     building
>     This is SBCL 1.2.5.nixos, an implementation of ANSI Common Lisp.
>     More information about SBCL is available at <http://www.sbcl.org/>.
>
>     SBCL is free software, provided as is, with absolutely no warranty.
>     It is mostly in the public domain; some portions are provided under
>     BSD-style licenses.  See the CREDITS and COPYING files in the
>     distribution for more information.
>     [undoing binding stack and other enclosing state... done]
>     [saving current Lisp image into hello:
>     writing 5680 bytes from the read-only space at 0x20000000
>     writing 3120 bytes from the static space at 0x20100000
>     writing 50462720 bytes from the dynamic space at 0x1000000000
>     done]
>     -rw-r--r-- 1 nixbld1 nixbld 410 May 11 08:11 default.nix
>     -rwxr-xr-x 1 nixbld1 nixbld 49M May 11 08:11 hello
>     -rw-r--r-- 1 nixbld1 nixbld  44 May 11 08:11 hello.lisp
>     installing
>     post-installation fixup
>     patching ELF executables and libraries in /nix/store/2rhdmlbiklrrsh660ix0db415xyi46wn-hello-0.0.1
>     /nix/store/2rhdmlbiklrrsh660ix0db415xyi46wn-hello-0.0.1/bin/hello
>     gzipping man pages in /nix/store/2rhdmlbiklrrsh660ix0db415xyi46wn-hello-0.0.1
>     stripping (with flags -S) in /nix/store/2rhdmlbiklrrsh660ix0db415xyi46wn-hello-0.0.1/bin
>     patching script interpreter paths in /nix/store/2rhdmlbiklrrsh660ix0db415xyi46wn-hello-0.0.1
>     /nix/store/2rhdmlbiklrrsh660ix0db415xyi46wn-hello-0.0.1
>
> The hello executable was 49M after building it. But the one in nix-store
> is this:
>
>     l -lha result/bin                                                                                                                                                                                           ~
>     insgesamt 272K
>     dr-xr-xr-x 2 root nixbld 4,0K  1. Jan 1970  .
>     dr-xr-xr-x 3 root nixbld 4,0K  1. Jan 1970  ..
>     -r-xr-xr-x 6 root root   262K  1. Jan 1970  hello
>
> What' wrong here?
>
> Thanks in advance!
> Eike
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