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John Ericson 44c8d83831 Create outputOf primop. 
In the Nix language, given a drv path, we should be able to construct
another string referencing to one of its output. We can do this today
with `(import drvPath).output`, but this only works for derivations we
already have.

With dynamic derivations, however, that doesn't work well because the
`drvPath` isn't yet built: importing it like would need to trigger IFD,
when the whole point of this feature is to do "dynamic build graph"
without IFD!

Instead, what we want to do is create a placeholder value with the right
string context to refer to the output of the as-yet unbuilt derivation.
A new primop in the language, analogous to `builtins.placeholder` can be
used to create one. This will achieve all the right properties. The
placeholder machinery also will match out the `outPath` attribute for CA
derivations works.

In 60b7121d2c we added that type of
placeholder, and the derived path and string holder changes necessary to
support it. Then in the previous commit we cleaned up the code
(inspiration finally hit me!) to deduplicate the code and expose exactly
what we need. Now, we can wire up the primop trivally!

Part of RFC 92: dynamic derivations (tracking issue #6316)

Co-authored-by: Robert Hensing <roberth@users.noreply.github.com>
2023-08-14 09:37:37 -04:00
.github labeler: Stop removing labels 2023-07-31 22:51:06 +02:00
config Run autoupdate 2021-06-01 11:42:38 +02:00
contrib function-trace: always show the trace 2019-09-18 23:23:21 +02:00
doc Create outputOf primop. 2023-08-14 09:37:37 -04:00
m4 autoconf: Fix C++17 detection not working on Ubuntu 16.04. 2019-07-03 04:32:25 +02:00
maintainers maintainers: add note on marking PRs as draft 2023-06-19 10:55:34 +02:00
misc Choose a reasonable number similar to LimitNOFile 2023-07-07 07:52:16 -07:00
mk Introduce notion of a test group, use for CA tests 2023-07-18 09:31:13 -04:00
perl Simplify ContentAddress 2023-07-07 07:30:01 -04:00
scripts Merge pull request #8512 from scarf005/install-show-uid 2023-06-15 13:49:44 +02:00
src Create outputOf primop. 2023-08-14 09:37:37 -04:00
tests Create outputOf primop. 2023-08-14 09:37:37 -04:00
.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 Expanded test suite 2023-07-11 21:43:09 -04:00
.version Bump version 2023-07-24 21:30:33 +02:00
boehmgc-coroutine-sp-fallback.diff Always disable GC in a coroutine unless the patch is applied 2023-04-07 14:54:38 +02:00
bootstrap.sh bootstrap: Simplify & make more robust. 2011-09-06 12:11:05 +00:00
configure.ac expand on the system type in hacking guide 2023-07-19 10:37:40 +02:00
CONTRIBUTING.md CONTRIBUTING.md: add link to "good first issues" 2023-06-19 10:39:19 +02:00
COPYING * Change this to LGPL to keep the government happy. 2006-04-25 16:41:06 +00:00
default.nix add flake-compat to flake.nix and use sha256 in default.nix 2023-03-06 21:11:24 +01:00
docker.nix fix "add an option to include flake-registry..." 2023-05-16 14:35:31 +02:00
flake.lock add flake-compat to flake.nix and use sha256 in default.nix 2023-03-06 21:11:24 +01:00
flake.nix Allow tarball URLs to redirect to a lockable immutable URL 2023-06-13 14:17:45 +02:00
local.mk Enable -Werror=switch-enum 2023-04-03 18:45:20 +02:00
Makefile Introduce notion of a test group, use for CA tests 2023-07-18 09:31:13 -04:00
Makefile.config.in Generate API docs with Doxygen 2023-03-10 12:51:06 -05:00
precompiled-headers.h Config: Use nlohmann/json 2020-08-20 11:02:16 +02:00
README.md Improve hacking.md 2023-02-13 12:00:00 +04:00
shell.nix Remove url literals 2022-01-24 13:28:21 +01:00

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 to set up a development environment and build Nix from source.

Additional Resources

License

Nix is released under the LGPL v2.1.