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R""(
# Examples
* Show what `nixpkgs` resolves to:
```console
# nix flake metadata nixpkgs
Resolved URL: github:edolstra/dwarffs
Locked URL: github:edolstra/dwarffs/f691e2c991e75edb22836f1dbe632c40324215c5
Description: A filesystem that fetches DWARF debug info from the Internet on demand
Path: /nix/store/769s05vjydmc2lcf6b02az28wsa9ixh1-source
Revision: f691e2c991e75edb22836f1dbe632c40324215c5
Last modified: 2021-01-21 15:41:26
Inputs:
├───nix: github:NixOS/nix/6254b1f5d298ff73127d7b0f0da48f142bdc753c
│ ├───lowdown-src: github:kristapsdz/lowdown/1705b4a26fbf065d9574dce47a94e8c7c79e052f
│ └───nixpkgs: github:NixOS/nixpkgs/ad0d20345219790533ebe06571f82ed6b034db31
└───nixpkgs follows input 'nix/nixpkgs'
```
* Show information about `dwarffs` in JSON format:
```console
# nix flake metadata dwarffs --json | jq .
{
"description": "A filesystem that fetches DWARF debug info from the Internet on demand",
"lastModified": 1597153508,
"locked": {
"lastModified": 1597153508,
"narHash": "sha256-VHg3MYVgQ12LeRSU2PSoDeKlSPD8PYYEFxxwkVVDRd0=",
"owner": "edolstra",
"repo": "dwarffs",
"rev": "d181d714fd36eb06f4992a1997cd5601e26db8f5",
"type": "github"
},
"locks": { ... },
"original": {
"id": "dwarffs",
"type": "indirect"
},
"originalUrl": "flake:dwarffs",
"path": "/nix/store/hang3792qwdmm2n0d9nsrs5n6bsws6kv-source",
"resolved": {
"owner": "edolstra",
"repo": "dwarffs",
"type": "github"
},
"resolvedUrl": "github:edolstra/dwarffs",
"revision": "d181d714fd36eb06f4992a1997cd5601e26db8f5",
"url": "github:edolstra/dwarffs/d181d714fd36eb06f4992a1997cd5601e26db8f5"
}
```
# Description
This command shows information about the flake specified by the flake
reference *flake-url*. It resolves the flake reference using the
[flake registry](./nix3-registry.md), fetches it, and prints some meta
data. This includes:
* `Resolved URL`: If *flake-url* is a flake identifier, then this is
the flake reference that specifies its actual location, looked up in
the flake registry.
* `Locked URL`: A flake reference that contains a commit or content
hash and thus uniquely identifies a specific flake version.
* `Description`: A one-line description of the flake, taken from the
`description` field in `flake.nix`.
* `Path`: The store path containing the source code of the flake.
* `Revision`: The Git or Mercurial commit hash of the locked flake.
* `Revisions`: The number of ancestors of the Git or Mercurial commit
of the locked flake. Note that this is not available for `github`
flakes.
* `Last modified`: For Git or Mercurial flakes, this is the commit
time of the commit of the locked flake; for tarball flakes, it's the
most recent timestamp of any file inside the tarball.
* `Inputs`: The flake inputs with their corresponding lock file
entries.
With `--json`, the output is a JSON object with the following fields:
* `original` and `originalUrl`: The flake reference specified by the
user (*flake-url*) in attribute set and URL representation.
* `resolved` and `resolvedUrl`: The resolved flake reference (see
above) in attribute set and URL representation.
* `locked` and `lockedUrl`: The locked flake reference (see above) in
attribute set and URL representation.
* `description`: See `Description` above.
* `path`: See `Path` above.
* `revision`: See `Revision` above.
* `revCount`: See `Revisions` above.
* `lastModified`: See `Last modified` above.
* `locks`: The contents of `flake.lock`.
)""
|
