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A modern, delicious implementation of the Nix package manager, focused on correctness, usability, and growth — and committed to doing right by its community
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aszlig 525b38eee8
Fix unspecified behaviour in readStorePathCAMap 
When deploying a Hydra instance with current Nix master, most builds
would not run because of errors like this:

  queue monitor: error: --- Error --- hydra-queue-runner
  error: --- UsageError --- nix-daemon
  not a content address because it is not in the form '<prefix>:<rest>': /nix/store/...-somedrv

The last error message is from parseContentAddress, which expects a
colon-separated string, however what we got here is a store path.

Looking at the worker protocol, the following message sent to the Nix
daemon caused the error above:

  0x1E -> wopQuerySubstitutablePathInfos
  0x01 -> Number of paths
  0x16 -> Length of string
  "/nix/store/...-somedrv"
  0x00 -> Length of string
  ""

Looking at writeStorePathCAMap, the store path is indeed the first field
that's transmitted. However, readStorePathCAMap expects it to be the
*second* field *on my machine*, since expression evaluation order is a
classic form of unspecified behaviour[1] in C++.

This has been introduced in https://github.com/NixOS/nix/pull/3689,
specifically in commit 66a62b3189.

[1]: https://en.wikipedia.org/wiki/Unspecified_behavior#Order_of_evaluation_of_subexpressions

Signed-off-by: aszlig <aszlig@nix.build>
2020-09-13 02:40:51 +02:00
.github speed up CI 2020-08-30 22:52:34 +02:00
config update config/config.{sub,guess} 2018-08-13 20:00:17 +00:00
contrib function-trace: always show the trace 2019-09-18 23:23:21 +02:00
corepkgs Move call-flake.nix into libexpr 2020-03-11 17:04:51 +01:00
doc/manual docs+test: fix remaining installer downloads without -L (#4006) 2020-09-12 22:08:40 +02:00
m4 autoconf: Fix C++17 detection not working on Ubuntu 16.04. 2019-07-03 04:32:25 +02:00
maintainers set Content-Type to "text/plain" for install script 2020-08-20 13:21:22 +02:00
misc Fix completion script install name 2020-06-04 13:37:37 +02:00
mk Close stdin while running tests 2020-08-28 18:43:34 +02:00
nix-rust make check: Run unit tests 2020-05-08 11:49:40 +02:00
perl Merge remote-tracking branch 'upstream/master' into derivation-header-include-order 2020-08-18 14:36:44 +00:00
scripts Merge pull request #3788 from crinklywrappr/master 2020-07-31 16:44:26 +02:00
src Fix unspecified behaviour in readStorePathCAMap 2020-09-13 02:40:51 +02:00
tests docs+test: fix remaining installer downloads without -L (#4006) 2020-09-12 22:08:40 +02:00
.dir-locals.el .dir-locals.el: Set c-block-comment-prefix 2020-07-10 11:21:06 +02:00
.editorconfig Add .editorconfig 2017-06-05 22:57:28 +01:00
.gitignore Generate builtins section of the manual 2020-08-24 14:49:30 +02:00
.version Bump version to 3.0 2020-07-28 13:18:27 +02:00
bootstrap.sh bootstrap: Simplify & make more robust. 2011-09-06 12:11:05 +00:00
configure.ac Use mdbook 2020-07-23 18:26:48 +02:00
COPYING * Change this to LGPL to keep the government happy. 2006-04-25 16:41:06 +00:00
default.nix Simplify shell.nix and default.nix 2020-06-17 19:21:46 +02:00
flake.lock Fix clang build 2020-08-24 21:13:39 +02:00
flake.nix Merge remote-tracking branch 'origin/master' into markdown 2020-09-01 09:48:08 +02:00
local.mk Remove global -I flags 2020-03-30 15:30:19 +02:00
Makefile Merge remote-tracking branch 'origin/master' into flakes 2020-06-17 10:26:52 +02:00
Makefile.config.in Remove references to xmllint 2020-07-23 18:26:48 +02:00
precompiled-headers.h Config: Use nlohmann/json 2020-08-20 11:02:16 +02:00
README.md README: update link to Hacking section 2020-09-01 12:05:49 -07:00
shell.nix Add back flake-compat shell.nix 2020-07-17 14:58:59 +00:00

README.md

Nix

Open Collective supporters Test

Nix is a powerful package manager for Linux and other Unix systems that makes package management reliable and reproducible. Please refer to the Nix manual for more details.

Installation

On Linux and macOS the easiest way to Install Nix is to run the following shell command (as a user other than root):

$ curl -L https://nixos.org/nix/install | sh

Information on additional installation methods is available on the Nix download page.

Building And Developing

See our Hacking guide in our manual for instruction on how to build nix from source with nix-build or how to get a development environment.

Additional Resources

License

Nix is released under the LGPL v2.1.