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readme: small additions

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Alexander Tomokhov 2024-01-11 00:03:01 +04:00
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README.md
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@ -26,7 +26,7 @@ There are 2 methods:
In any case a Nix flake input is specified using some special _references_ syntax, including URLs, revisions, etc, described in manual: https://nixos.org/manual/nix/stable/command-ref/new-cli/nix3-flake.html#examples. Such reference can be used inside `flake.nix` or as an argument to `nix flake` commands. When a new reference is encountered Nix downloads and extracts it to /nix/store.
Before and after running `nix flake lock` (or `nix flake update`) commands you would most likely want to list current inputs using `nix flake metadata`, which are read from `flake.lock` file. Although, Nix should also print a diff between changed referrences once changed.
Before and after running `nix flake lock` (or `nix flake update`) commands you would most likely want to list current inputs using `nix flake metadata`, which are read from `flake.lock` file. Although, Nix should also print a diff between changed references once changed.
`--commit-lock-file` option tells Nix commands to do `git commit flake.lock` automatically, creating a new commit for you.
@ -45,7 +45,7 @@ Depending on how "precise" the URL was speficied in `flake.nix`, with _unmodifie
---
Once Nix 2.19 stabilizes, a different command _must_ be used for updating a single input, like this:
Once Nix 2.19 stabilizes, a different command _must_ be used for updating a single input (recursively), like this:
```console
$ nix flake update nixpkgs
```
@ -53,7 +53,7 @@ $ nix flake update nixpkgs
### method 2: override specific input
Overriding is more powerful as it allows to change flake input reference to anything just in one command (not only update in the bounds of a branch or a repository).
Overriding is more powerful (for non-nested flakes) as it allows to change a flake input reference to anything just in one command (not only update in the bounds of a branch or a repository).
Example:
```console
@ -61,10 +61,10 @@ $ nix flake lock --override-input nixpkgs github:nixos/nixpkgs?ref=nixos-23.11
$ nix flake lock --override-input selfprivacy-api git+https://git.selfprivacy.org/SelfPrivacy/selfprivacy-rest-api.git?ref=flakes
```
Similarly to update mechanism (described above), depending on the "precision" of an URL, its update scope varies.
Similarly to update mechanism (described above), depending on the "precision" of an URL, its update scope varies accordingly.
Note, that subsequent calls of `nix flake lock --update-input <INPUT>` or `nix flake update` (or `nix flake update INPUT` by Nix 2.19+) will update the input regardless of the prior override. The information about override is stored only in `flake.lock` (`flake.nix` is not altered by Nix).
---
Note, that override does not update flake inputs recursively (say, you have a flake inside your flake input). For recursive updates only `nix flake lock --update-input` and `nix flake update` mechanisms are suitable. However, as of 2024-01-10 none of the current inputs contain other flakes, hence override mechanism is fine.
Note, that override does not update flake inputs recursively (say, you have a flake nested inside your flake input). For recursive updates only `nix flake lock --update-input` and `nix flake update` mechanisms are suitable. However, as of 2024-01-10 none of the SP NixOS configuration inputs contain other flakes, hence override mechanism is fine (don't confuse with top-level flake which has nested inputs).