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Eelco Dolstra 6644b6099b
Add flake evaluation cache 
This exploits the hermetic nature of flake evaluation to speed up
repeated evaluations of a flake output attribute.

For example (doing 'nix build' on an already present package):

  $ time nix build nixpkgs:firefox

  real    0m1.497s
  user    0m1.160s
  sys     0m0.139s

  $ time nix build nixpkgs:firefox

  real    0m0.052s
  user    0m0.038s
  sys     0m0.007s

The cache is ~/.cache/nix/eval-cache-v1.sqlite, which has entries like

  INSERT INTO Attributes VALUES(
    X'92a907d4efe933af2a46959b082cdff176aa5bfeb47a98fabd234809a67ab195',
    'packages.firefox',
    1,
    '/nix/store/pbalzf8x19hckr8cwdv62rd6g0lqgc38-firefox-67.0.drv /nix/store/g6q0gx0v6xvdnizp8lrcw7c4gdkzana0-firefox-67.0 out');

where the hash 92a9... is a fingerprint over the flake store path and
the contents of the lockfile. Because flakes are evaluated in pure
mode, this uniquely identifies the evaluation result.
2019-06-07 22:25:48 +02:00
.github Add .github/FUNDING.yml 2019-05-31 22:19:46 -04:00
config update config/config.{sub,guess} 2018-08-13 20:00:17 +00:00
corepkgs nix: Enable pure mode by default 2019-02-12 20:35:03 +01:00
doc Made epochs more fine-grained 2019-06-03 14:47:47 +02:00
maintainers Fix release script 2019-04-15 19:17:17 +02:00
misc nix-daemon: add variable to disable fork safety 2019-02-09 20:35:30 +01:00
mk Support --disable-shared flag. 2019-02-13 00:03:10 -05:00
perl perl/configure.ac: fix for new version location too 2019-03-25 09:18:30 +01:00
scripts Replace type with command -v in install script 2019-05-29 10:08:21 -04:00
src Add flake evaluation cache 2019-06-07 22:25:48 +02:00
tests Shorter syntax for referencing flake outputs 2019-06-04 22:35:43 +02:00
.dir-locals.el Add .dir-locals.el for Emacs 2016-01-28 11:12:04 +01:00
.editorconfig Add .editorconfig 2017-06-05 22:57:28 +01:00
.gitignore Move flake template into a separate file 2019-04-08 23:39:38 +02:00
.travis.yml Test the installer 2017-07-14 12:11:04 -04:00
.version version -> .version, avoid conflict with C++20 <version> 2019-03-25 09:18:30 +01:00
bootstrap.sh bootstrap: Simplify & make more robust. 2011-09-06 12:11:05 +00:00
configure.ac Add basic flake tests 2019-05-07 23:32:09 +02:00
COPYING * Change this to LGPL to keep the government happy. 2006-04-25 16:41:06 +00:00
flake.lock Update flake.lock 2019-06-04 20:57:18 +02:00
flake.nix Made epochs more fine-grained 2019-06-03 14:47:47 +02:00
local.mk Fetch the flake registry from the NixOS/flake-registry repo 2019-05-22 22:56:46 +02:00
Makefile Merge all nix-* binaries into nix 2018-10-26 12:54:00 +02:00
Makefile.config.in Add basic flake tests 2019-05-07 23:32:09 +02:00
nix.spec.in Attempt to fix the RPM build 2018-07-31 14:03:19 +02:00
README.md Fix minor grammatical nitpick ("it's" vs. "its") in README.md. 2017-03-22 10:11:23 -04:00
release-common.nix Merge remote-tracking branch 'origin/master' into flakes 2019-06-03 09:22:19 +02:00
release.nix Add date of last commit to SourceInfo 2019-05-29 10:10:36 +02:00
shell.nix shell.nix: Use clang by default 2019-06-04 13:44:12 +02:00

README.md

Nix, the purely functional package manager

Nix is a new take on package management that is fairly unique. Because of its purity aspects, a lot of issues found in traditional package managers don't appear with Nix.

To find out more about the tool, usage and installation instructions, please read the manual, which is available on the Nix website at http://nixos.org/nix/manual.

Contributing

Take a look at the Hacking Section of the manual. It helps you to get started with building Nix from source.

License

Nix is released under the LGPL v2.1

This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit.