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| -rw-r--r-- | doc/languages-frameworks/dhall.section.md | 31 |
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diff --git a/doc/languages-frameworks/dhall.section.md b/doc/languages-frameworks/dhall.section.md index d1adcbf736b..20470e337c1 100644 --- a/doc/languages-frameworks/dhall.section.md +++ b/doc/languages-frameworks/dhall.section.md @@ -342,6 +342,37 @@ $ dhall-to-nixpkgs directory ~/proj/dhall-semver } ``` +### Remote imports as fixed-output derivations {#ssec-dhall-remote-imports-as-fod} + +`dhall-to-nixpkgs` has the ability to fetch and build remote imports as +fixed-output derivations by using their Dhall integrity check. This is +sometimes easier than manually packaging all remote imports. + +This can be used like the following: + +```bash +$ dhall-to-nixpkgs directory --fixed-output-derivations ~/proj/dhall-semver +{ buildDhallDirectoryPackage, buildDhallUrl }: + buildDhallDirectoryPackage { + name = "proj"; + src = /Users/gabriel/proj/dhall-semver; + file = "package.dhall"; + source = false; + document = false; + dependencies = [ + (buildDhallUrl { + url = "https://prelude.dhall-lang.org/v17.0.0/package.dhall"; + hash = "sha256-ENs8kZwl6QRoM9+Jeo/+JwHcOQ+giT2VjDQwUkvlpD4="; + dhall-hash = "sha256:10db3c919c25e9046833df897a8ffe2701dc390fa0893d958c3430524be5a43e"; + }) + ]; + } +``` + +Here, `dhall-semver`'s `Prelude` dependency is fetched and built with the +`buildDhallUrl` helper function, instead of being passed in as a function +argument. + ## Overriding dependency versions {#ssec-dhall-overriding-dependency-versions} Suppose that we change our `true.dhall` example expression to depend on an older |