Man page - nix3-store-prefetch-file(1)

Packages contains this manual

Manual

nix3-store-prefetch-file

Name
Synopsis
Examples
Description
Options
Logging-related options
Miscellaneous global options

Warning
This program is experimental and its interface is subject to change.

Name

nix store prefetch-file - download a file into the Nix store

Synopsis

nix store prefetch-file [ option …] url

Examples

Download a file to the Nix store:

# nix store prefetch-file https://releases.nixos.org/nix/nix-2.3.10/nix-2.3.10.tar.xz
Downloaded ’https://releases.nixos.org/nix/nix-2.3.10/nix-2.3.10.tar.xz’ to
’/nix/store/vbdbi42hgnc4h7pyqzp6h2yf77kw93aw-source’ (hash
’sha256-qKheVd5D0BervxMDbt+1hnTKE2aRWC8XCAwc0SeHt6s=’).

Download a file and get the SHA-512 hash:

# nix store prefetch-file --json --hash-type sha512 \
https://releases.nixos.org/nix/nix-2.3.10/nix-2.3.10.tar.xz \
| jq -r .hash
sha512-6XJxfym0TNH9knxeH4ZOvns6wElFy3uahunl2hJgovACCMEMXSy42s69zWVyGJALXTI+86tpDJGlIcAySEKBbA==

Description

This command downloads the file url to the Nix store. It prints out the resulting store path and the cryptographic hash of the contents of the file.

The name component of the store path defaults to the last component of url , but this can be overridden using --name.

Options

--executable

Make the resulting file executable. Note that this causes the resulting hash to be a NAR hash rather than a flat file hash.

--expected-hash hash

The expected hash of the file.

--hash-type hash-algo

Hash algorithm (md5, sha1, sha256, or sha512).

--json

Produce output in JSON format, suitable for consumption by another program.

--name name

Override the name component of the resulting store path. It defaults to the base name of url .

--unpack

Unpack the archive (which must be a tarball or zip file) and add the result to the Nix store.

Logging-related options

--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.

Miscellaneous global options

--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Consider all previously downloaded files out-of-date.

--version

Show version information.

Note

See man nix.conf for overriding configuration settings with command line flags.