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author | Robert Hensing <robert@roberthensing.nl> | 2021-05-15 15:10:55 +0200 |
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committer | Robert Hensing <robert@roberthensing.nl> | 2021-05-15 17:04:25 +0200 |
commit | ed4523186e452d185d8ba1d1eabe07ace33a4f87 (patch) | |
tree | 9d53ac499857d5fd14858ff7340226c198a0a3d6 /doc/builders | |
parent | cc60f81e69154789ad3e23f0ec60110ed3f7aece (diff) | |
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writeReferencesToFile: docs and tests
Diffstat (limited to 'doc/builders')
-rw-r--r-- | doc/builders/trivial-builders.chapter.md | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/doc/builders/trivial-builders.chapter.md b/doc/builders/trivial-builders.chapter.md index 432183eaf0f..bc1317cc49c 100644 --- a/doc/builders/trivial-builders.chapter.md +++ b/doc/builders/trivial-builders.chapter.md @@ -51,6 +51,32 @@ Many more commands wrap `writeTextFile` including `writeText`, `writeTextDir`, ` This can be used to put many derivations into the same directory structure. It works by creating a new derivation and adding symlinks to each of the paths listed. It expects two arguments, `name`, and `paths`. `name` is the name used in the Nix store path for the created derivation. `paths` is a list of paths that will be symlinked. These paths can be to Nix store derivations or any other subdirectory contained within. +## `writeReferencesToFile` {#trivial-builder-writeReferencesToFile} + +Writes the closure of transitive dependencies to a file. + +This produces the equivalent of `nix-store -q --requisites`. + +For example, + +```nix +writeReferencesToFile (writeScriptBin "hi" ''${hello}/bin/hello'') +``` + +produces an output path `/nix/store/<hash>-runtime-deps` containing + +```nix +/nix/store/<hash>-hello-2.10 +/nix/store/<hash>-hi +/nix/store/<hash>-libidn2-2.3.0 +/nix/store/<hash>-libunistring-0.9.10 +/nix/store/<hash>-glibc-2.32-40 +``` + +You can see that this includes `hi`, the original input path, +`hello`, which is a direct reference, but also +the other paths that are indirectly required to run `hello`. + ## `writeDirectReferencesToFile` {#trivial-builder-writeDirectReferencesToFile} Writes the set of references to the output file, that is, their immediate dependencies. |