Warning
This program is
experimental
and its interface is subject to change.
nix flake info - show flake metadata
nix flake info [option…]
flake-url
- •
- Show what dwarffs resolves to:
# nix flake metadata dwarffs
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:
# 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"
}
This command shows information about the flake specified by the
flake reference flake-url. It resolves the flake reference using the
flake registry, 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.
- •
- --json
- Produce output in JSON format, suitable for consumption by another
program.
- •
- --arg
name expr
- Pass the value expr as the argument name to Nix
functions.
- •
- --arg-from-file
name path
- Pass the contents of file path as the argument name to Nix
functions.
- •
- --arg-from-stdin
name
- Pass the contents of stdin as the argument name to Nix
functions.
- •
- --argstr
name string
- Pass the string string as the argument name to Nix
functions.
- •
- --debugger
- Start an interactive environment if evaluation fails.
- •
- --eval-store
store-url
- The
URL
of the Nix store to use for evaluation, i.e. to store derivations
(.drv files) and inputs referenced by them.
- •
- --impure
- Allow access to mutable paths and repositories.
- •
- --include /
-I path
- Add path to search path entries used to resolve
lookup
paths
- This option may be given multiple times.
- Paths added through -I take precedence over the
nix-path
configuration setting and the
NIX_PATH
environment variable.
- •
- --override-flake
original-ref resolved-ref
- Override the flake registries, redirecting original-ref to
resolved-ref.
- •
- --commit-lock-file
- Commit changes to the flake’s lock file.
- •
- --inputs-from
flake-url
- Use the inputs of the specified flake as registry entries.
- •
- --no-registries
- Don’t allow lookups in the flake registries.
- •
- --no-update-lock-file
- Do not allow any updates to the flake’s lock file.
- •
- --no-write-lock-file
- Do not write the flake’s newly generated lock file.
- •
- --output-lock-file
flake-lock-path
- Write the given lock file instead of flake.lock
within the top-level flake.
- •
- --override-input
input-path flake-url
- Override a specific flake input (e.g.
dwarffs/nixpkgs). This implies
--no-write-lock-file.
- •
- --recreate-lock-file
- Recreate the flake’s lock file from scratch.
- •
- --reference-lock-file
flake-lock-path
- Read the given lock file instead of flake.lock
within the top-level flake.
- •
- --update-input
input-path
- Update a specific flake input (ignoring its previous entry in the lock
file).
- •
- --debug
- Set the logging verbosity level to ‘debug’.
- •
- --log-format
format
- Set the format of log output; one of raw,
internal-json, bar or
bar-with-logs.
- •
- --print-build-logs
/ -L
- Print full build logs on standard error.
- •
- --quiet
- Decrease the logging verbosity level.
- •
- --verbose /
-v
- Increase the logging verbosity level.
- •
- --help
- Show usage information.
- •
- --offline
- Disable substituters and consider all previously downloaded files
up-to-date.
- •
- --option
name value
- Set the Nix configuration setting name to value (overriding
nix.conf).
- •
- --refresh
- Consider all previously downloaded files out-of-date.
- •
- --repair
- During evaluation, rewrite missing or corrupted files in the Nix store.
During building, rebuild missing or corrupted store paths.
- •
- --version
- Show version information.
Note
See
man
nix.conf for overriding configuration settings with command line
flags.