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Allow specifying alternative paths for reading/writing flake locks

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This allows having multiple separate lockfiles for a single
project, which can be useful for testing against different versions of
nixpkgs; it also allows tracking custom input overrides for remote
flakes without requiring local clones of these flakes.

For example, if I want to build Nix against my locally pinned nixpkgs,
and have a lock file tracking this override independently of future
updates to said nixpkgs:

nix flake lock --output-lock-file /tmp/nix-flake.lock --override-input nixpkgs flake:nixpkgs
nix build --reference-lock-file /tmp/nix-flake.lock

Co-Authored-By: Will Fancher <elvishjerricco@gmail.com>
This commit is contained in:
Linus Heckemann 2023-03-13 21:08:52 +01:00
parent 4a96125c3c
commit e91596eb69
3 changed files with 47 additions and 12 deletions
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6
src/libexpr/flake/flake.hh
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@ -117,6 +117,12 @@ struct LockFlags
/* Whether to commit changes to flake.lock. */
bool commitLockFile = false;
/* The path to a lock file to read instead of the `flake.lock` file in the top-level flake */
std::optional<std::string> referenceLockFilePath = std::nullopt;
/* The path to a lock file to write to instead of the `flake.lock` file in the top-level flake */
std::optional<Path> outputLockFilePath = std::nullopt;
/* Flake inputs to be overridden. */
std::map<InputPath, FlakeRef> inputOverrides;