lix/mk
Eelco Dolstra d4dcffd643
Add pure evaluation mode
In this mode, the following restrictions apply:

* The builtins currentTime, currentSystem and storePath throw an
  error.

* $NIX_PATH and -I are ignored.

* fetchGit and fetchMercurial require a revision hash.

* fetchurl and fetchTarball require a sha256 attribute.

* No file system access is allowed outside of the paths returned by
  fetch{Git,Mercurial,url,Tarball}. Thus 'nix build -f ./foo.nix' is
  not allowed.

Thus, the evaluation result is completely reproducible from the
command line arguments. E.g.

  nix build --pure-eval '(
    let
      nix = fetchGit { url = https://github.com/NixOS/nixpkgs.git; rev = "9c927de4b179a6dd210dd88d34bda8af4b575680"; };
      nixpkgs = fetchGit { url = https://github.com/NixOS/nixpkgs.git; ref = "release-17.09"; rev = "66b4de79e3841530e6d9c6baf98702aa1f7124e4"; };
    in (import (nix + "/release.nix") { inherit nix nixpkgs; }).build.x86_64-linux
  )'

The goal is to enable completely reproducible and traceable
evaluation. For example, a NixOS configuration could be fully
described by a single Git commit hash. 'nixos-rebuild' would do
something like

  nix build --pure-eval '(
    (import (fetchGit { url = file:///my-nixos-config; rev = "..."; })).system
  ')

where the Git repository /my-nixos-config would use further fetchGit
calls or Git externals to fetch Nixpkgs and whatever other
dependencies it has. Either way, the commit hash would uniquely
identify the NixOS configuration and allow it to reproduced.
2018-01-16 19:23:18 +01:00
..
clean.mk Add 'mk/' from commit '1eff3ad37fdb9dcf9f8528fdacea0ebf0e79d545' 2014-02-01 14:38:28 +01:00
dist.mk Add 'mk/' from commit '1eff3ad37fdb9dcf9f8528fdacea0ebf0e79d545' 2014-02-01 14:38:28 +01:00
functions.mk Revert "Get rid of unicode quotes (#1140)" 2016-11-26 00:38:01 +01:00
install.mk Sync with make-rules repo 2014-04-03 17:37:14 +02:00
jars.mk Merge commit '36c67860363c93eb00cf5b8e2ad34f6f775e6901' 2014-12-14 01:47:06 +01:00
lib.mk set _GNU_SOURCE on cygwin 2017-04-21 11:27:27 -03:00
libraries.mk Revert "Get rid of unicode quotes (#1140)" 2016-11-26 00:38:01 +01:00
patterns.mk Merge commit '36c67860363c93eb00cf5b8e2ad34f6f775e6901' 2014-12-14 01:47:06 +01:00
programs.mk Revert "Get rid of unicode quotes (#1140)" 2016-11-26 00:38:01 +01:00
README.md Merge commit '8468806552d6730abec6431c42b5b0e897c0222c' 2014-02-03 19:57:02 +01:00
templates.mk Revert "Get rid of unicode quotes (#1140)" 2016-11-26 00:38:01 +01:00
tests.mk Add pure evaluation mode 2018-01-16 19:23:18 +01:00
tracing.mk Merge commit 'a210c995cdd9279ed4137ec5d2e4cc928cb36097' 2014-02-07 16:27:34 +01:00

This is a set of helper Makefiles for doing non-recursive builds with GNU Make. The canonical source can be found at https://github.com/edolstra/make-rules. You should copy the files into the mk subdirectory of your project.

TODO: write more documentation.