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author | Eelco Dolstra <eelco.dolstra@logicblox.com> | 2016-01-31 12:06:45 +0100 |
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committer | Eelco Dolstra <eelco.dolstra@logicblox.com> | 2016-01-31 12:18:09 +0100 |
commit | d367b8e7875161e655deaa96bf8a5dd0bcf8229e (patch) | |
tree | 9a4a7c0e60d1f1070c3dc35aed84e50a714cd9b7 /src/nix-env/nix-env.cc | |
parent | 9e7c1a4bbdbe6129dd9dc385776612c307d3d1bb (diff) |
Add build mode to compute fixed-output derivation hashes
For example,
$ nix-build --hash -A nix-repl.src
will build the fixed-output derivation nix-repl.src (a fetchFromGitHub
call), but instead of *verifying* the hash given in the Nix
expression, it prints out the resulting hash, and then moves the
result to its content-addressed location in the Nix store. E.g
build produced path ‘/nix/store/504a4k6zi69dq0yjc0bm12pa65bccxam-nix-repl-8a2f5f0607540ffe56b56d52db544373e1efb980-src’ with sha256 hash ‘0cjablz01i0g9smnavhf86imwx1f9mnh5flax75i615ml71gsr88’
The goal of this is to make all nix-prefetch-* scripts unnecessary: we
can just let Nix run the real thing (i.e., the corresponding fetch*
derivation).
Another example:
$ nix-build --hash -E 'with import <nixpkgs> {}; fetchgit { url = "https://github.com/NixOS/nix.git"; sha256 = "ffffffffffffffffffffffffffffffffffffffffffffffffffff"; }'
...
git revision is 9e7c1a4bbdbe6129dd9dc385776612c307d3d1bb
...
build produced path ‘/nix/store/gmsnh9i7x4mb7pyd2ns7n3c9l90jfsi1-nix’ with sha256 hash ‘1188xb621diw89n25rifqg9lxnzpz7nj5bfh4i1y3dnis0dmc0zp’
(Having to specify a fake sha256 hash is a bit annoying...)
Diffstat (limited to 'src/nix-env/nix-env.cc')
0 files changed, 0 insertions, 0 deletions