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Diffstat (limited to 'pkgs/populate/flake-jq.nix')
| -rw-r--r-- | pkgs/populate/flake-jq.nix | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/pkgs/populate/flake-jq.nix b/pkgs/populate/flake-jq.nix index 41edcc5..63afa9d 100644 --- a/pkgs/populate/flake-jq.nix +++ b/pkgs/populate/flake-jq.nix @@ -1,6 +1,21 @@ -# jq programs populate uses for flake and flake-input sources, in a file of -# their own, so tests can run them. +# Programs populate uses for flake and flake-input sources, in a file of +# their own, so tests can run them: jq programs, which run on the deploying +# machine, and a Nix function for the target, which may lack jq. rec { + # Nix function returning the subdirectory containing the flake that nix + # flake metadata describes, like subdirOf does in jq. + metadataSubdir = /* nix */ '' + metadata: let + subdir = ref: + ref.dir or (let + match = builtins.match ".*[?&]dir=([^&]*).*" (ref.url or ""); + in + if match == null then "" else builtins.head match); + subdirs = builtins.filter (dir: dir != "") + (map subdir [ (metadata.locked or {}) (metadata.original or {}) ]); + in + if subdirs == [] then "" else builtins.head subdirs + ''; # jq definitions for subdirectories containing flakes, which flake # references and lock entries name either as attribute dir or as query # parameter dir of their URL, depending on the version of Nix. fetchTree |