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Enables us to run nix *inside* of a sandbox.
We have to mount the whole store, because otherwise realized store
paths built inside of the sandbox are not accessible.
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So far I mostly used this implementation for the games we have packaged,
where we pretty much patch out all commands that execute external
programs.
However in order to be useful in a more generic way, it makes sense to
provide a /bin/sh implementation, especially when you have to deal with
scripting languages.
I'm using dash here, because it's a more minimal implementation rather
than the default shell (bash) we use in nixpkgs and it practically only
needs to be able to run constructs like "/bin/sh -c foo".
Signed-off-by: aszlig <aszlig@nix.build>
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Since add_DT_NEEDED_for_dynamic is no longer the default for ld[1],
we'll get a linking error like this:
nix-query.o: undefined reference to symbol '_ZNK3nix5Store22followLinksToStorePathERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE'
Unfortunately, the only way to work around this without re-enabling the
same flag is directly specify dependencies we really *should* not need
to specify because they're a transient dependency of libnixmain.
So for now I'm reverting back to the previous behaviour with
--copy-dt-needed-entries until I got time to look into it in detail.
From the ld(1) manual page:
--copy-dt-needed-entries
--no-copy-dt-needed-entries
This option affects the treatment of dynamic libraries referred to
by DT_NEEDED tags inside ELF dynamic libraries mentioned on the
command line. Normally the linker will add a DT_NEEDED tag to the
output binary for each library mentioned in a DT_NEEDED tag in an
input dynamic library. With --no-copy-dt-needed-entries specified on
the command line however any dynamic libraries that follow it will
have their DT_NEEDED entries ignored. The default behaviour can be
restored with --copy-dt-needed-entries.
This option also has an effect on the resolution of symbols in
dynamic libraries. With the default setting dynamic libraries
mentioned on the command line will be recursively searched,
following their DT_NEEDED tags to other libraries, in order to
resolve symbols required by the output binary. With
--no-copy-dt-needed-entries specified however the searching of
dynamic libraries that follow it will stop with the dynamic library
itself. No DT_NEEDED links will be traversed to resolve symbols.
[1]: https://github.com/NixOS/nixpkgs/commit/bcfe7af84b3628a31bfcc43dde30fc553a73adac
Signed-off-by: aszlig <aszlig@nix.build>
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In order to do integer comparisons on the Nix version, we need to
zero-pad the minor version, so that we always have two digits.
Since the change of Nix version 1.12 to 2.0 the minor version no longer
has two digits, so we get 20 instead of 112 and when compared the former
is smaller than the latter but it has to be the opposite.
Signed-off-by: aszlig <aszlig@nix.build>
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This is not only useful for packaging games, so let's make it available
from the vuizvui scope, so we can use it from other packages as well.
Signed-off-by: aszlig <aszlig@nix.build>
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