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
-
--executableMake the resulting file executable. Note that this causes the resulting hash to be a NAR hash rather than a flat file hash. -
--expected-hashhash The expected hash of the file. -
--hash-typehash-algo hash algorithm ('md5', 'sha1', 'sha256', or 'sha512') -
--jsonProduce output in JSON format, suitable for consumption by another program. -
--namename Override the name component of the resulting store path. It defaults to the base name of url. -
--unpackUnpack the archive (which must be a tarball or zip file) and add the result to the Nix store.
Logging-related options:
-
--debugSet the logging verbosity level to 'debug'. -
--log-formatformat Set the format of log output; one ofraw,internal-json,bar,bar-with-logs,multilineormultiline-with-logs. -
--print-build-logs/-LPrint full build logs on standard error. -
--quietDecrease the logging verbosity level. -
--verbose/-vIncrease the logging verbosity level.
Miscellaneous global options:
-
--helpShow usage information. -
--offlineDisable substituters and consider all previously downloaded files up-to-date. -
--optionname value Set the Lix configuration setting name to value (overridingnix.conf). -
--refreshConsider all previously downloaded files out-of-date. -
--versionShow version information.
Note
See
man nix.conffor overriding configuration settings with command line flags.