lix/src
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
..
build-remote Make the Derived Path family of types inductive for dynamic derivations 2023-08-10 00:08:32 -04:00
libcmd Make the Derived Path family of types inductive for dynamic derivations 2023-08-10 00:08:32 -04:00
libexpr Create outputOf primop. 2023-08-14 09:37:37 -04:00
libfetchers Don't require .tar/.zip extension for tarball flakerefs 2023-08-01 16:07:20 +02:00
libmain nix: Support the --repair flag 2023-04-28 17:03:04 +02:00
libstore Rework evaluator SingleDerivedPath infra 2023-08-14 08:44:50 -04:00
libutil Make the Derived Path family of types inductive for dynamic derivations 2023-08-10 00:08:32 -04:00
nix Create outputOf primop. 2023-08-14 09:37:37 -04:00
nix-build Make the Derived Path family of types inductive for dynamic derivations 2023-08-10 00:08:32 -04:00
nix-channel Factor out nix-defexpr path computation 2023-08-02 12:54:48 -04:00
nix-collect-garbage Clean up a few things related to profiles (#8526) 2023-06-19 04:04:59 +00:00
nix-copy-closure Remove FormatOrString and remaining uses of format() 2023-03-02 15:57:54 +01:00
nix-env Merge pull request #8735 from obsidiansystems/defexpr 2023-08-11 20:32:03 +02:00
nix-instantiate nix: Support the --repair flag 2023-04-28 17:03:04 +02:00
nix-store Simplify ContentAddress 2023-07-07 07:30:01 -04:00
resolve-system-dependencies Remove FormatOrString and remaining uses of format() 2023-03-02 15:57:54 +01:00
toml11