nix3-store-prefetch-file - Man Page

nix store prefetch-file [option…] url

• 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==

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.

• --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 (blake3, 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.

• --no-pretty

  Print compact JSON output on a single line, even when the output is a terminal. Some commands may print multiple JSON objects on separate lines.

            See `--pretty`.

• --pretty

  Print multi-line, indented JSON output for readability.

            Default: indent if output is to a terminal.

            This option is only effective when `--json` is also specified.

• --unpack

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