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.

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Consider all previously downloaded files out-of-date.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

Options to override configuration settings:

•

--accept-flake-config

Enable the accept-flake-config setting.

•

--access-tokens value

Set the access-tokens setting.

•

--allow-dirty

Enable the allow-dirty setting.

•

--allow-import-from-derivation

Enable the allow-import-from-derivation setting.

•

--allow-new-privileges

Enable the allow-new-privileges setting.

•

--allow-symlinked-store

Enable the allow-symlinked-store setting.

•

--allow-unsafe-native-code-during-evaluation

Enable the allow-unsafe-native-code-during-evaluation setting.

•

--allowed-impure-host-deps value

Set the allowed-impure-host-deps setting.

•

--allowed-uris value

Set the allowed-uris setting.

•

--allowed-users value

Set the allowed-users setting.

•

--auto-allocate-uids

Enable the auto-allocate-uids setting.

•

--auto-optimise-store

Enable the auto-optimise-store setting.

•

--bash-prompt value

Set the bash-prompt setting.

•

--bash-prompt-prefix value

Set the bash-prompt-prefix setting.

•

--bash-prompt-suffix value

Set the bash-prompt-suffix setting.

•

--build-hook value

Set the build-hook setting.

•

--build-poll-interval value

Set the build-poll-interval setting.

•

--build-users-group value

Set the build-users-group setting.

•

--builders value

Set the builders setting.

•

--builders-use-substitutes

Enable the builders-use-substitutes setting.

•

--commit-lockfile-summary value

Set the commit-lockfile-summary setting.

•

--compress-build-log

Enable the compress-build-log setting.

•

--connect-timeout value

Set the connect-timeout setting.

•

--cores value

Set the cores setting.

•

--diff-hook value

Set the diff-hook setting.

•

--download-attempts value

Set the download-attempts setting.

•

--download-speed value

Set the download-speed setting.

•

--eval-cache

Enable the eval-cache setting.

•

--experimental-features value

Set the experimental-features setting.

•

--extra-access-tokens value

Append to the access-tokens setting.

•

--extra-allowed-impure-host-deps value

Append to the allowed-impure-host-deps setting.

•

--extra-allowed-uris value

Append to the allowed-uris setting.

•

--extra-allowed-users value

Append to the allowed-users setting.

•

--extra-build-hook value

Append to the build-hook setting.

•

--extra-experimental-features value

Append to the experimental-features setting.

•

--extra-extra-platforms value

Append to the extra-platforms setting.

•

--extra-hashed-mirrors value

Append to the hashed-mirrors setting.

•

--extra-ignored-acls value

Append to the ignored-acls setting.

•

--extra-nix-path value

Append to the nix-path setting.

•

--extra-platforms value

Set the extra-platforms setting.

•

--extra-plugin-files value

Append to the plugin-files setting.

•

--extra-sandbox-paths value

Append to the sandbox-paths setting.

•

--extra-secret-key-files value

Append to the secret-key-files setting.

•

--extra-substituters value

Append to the substituters setting.

•

--extra-system-features value

Append to the system-features setting.

•

--extra-trusted-public-keys value

Append to the trusted-public-keys setting.

•

--extra-trusted-substituters value

Append to the trusted-substituters setting.

•

--extra-trusted-users value

Append to the trusted-users setting.

•

--fallback

Enable the fallback setting.

•

--filter-syscalls

Enable the filter-syscalls setting.

•

--flake-registry value

Set the flake-registry setting.

•

--fsync-metadata

Enable the fsync-metadata setting.

•

--gc-reserved-space value

Set the gc-reserved-space setting.

•

--hashed-mirrors value

Set the hashed-mirrors setting.

•

--http-connections value

Set the http-connections setting.

•

--http2

Enable the http2 setting.

•

--id-count value

Set the id-count setting.

•

--ignore-try

Enable the ignore-try setting.

•

--ignored-acls value

Set the ignored-acls setting.

•

--impersonate-linux-26

Enable the impersonate-linux-26 setting.

•

--keep-build-log

Enable the keep-build-log setting.

•

--keep-derivations

Enable the keep-derivations setting.

•

--keep-env-derivations

Enable the keep-env-derivations setting.

•

--keep-failed

Enable the keep-failed setting.

•

--keep-going

Enable the keep-going setting.

•

--keep-outputs

Enable the keep-outputs setting.

•

--log-lines value

Set the log-lines setting.

•

--max-build-log-size value

Set the max-build-log-size setting.

•

--max-free value

Set the max-free setting.

•

--max-jobs value

Set the max-jobs setting.

•

--max-silent-time value

Set the max-silent-time setting.

•

--max-substitution-jobs value

Set the max-substitution-jobs setting.

•

--min-free value

Set the min-free setting.

•

--min-free-check-interval value

Set the min-free-check-interval setting.

•

--nar-buffer-size value

Set the nar-buffer-size setting.

•

--narinfo-cache-negative-ttl value

Set the narinfo-cache-negative-ttl setting.

•

--narinfo-cache-positive-ttl value

Set the narinfo-cache-positive-ttl setting.

•

--netrc-file value

Set the netrc-file setting.

•

--nix-path value

Set the nix-path setting.

•

--no-accept-flake-config

Disable the accept-flake-config setting.

•

--no-allow-dirty

Disable the allow-dirty setting.

•

--no-allow-import-from-derivation

Disable the allow-import-from-derivation setting.

•

--no-allow-new-privileges

Disable the allow-new-privileges setting.

•

--no-allow-symlinked-store

Disable the allow-symlinked-store setting.

•

--no-allow-unsafe-native-code-during-evaluation

Disable the allow-unsafe-native-code-during-evaluation setting.

•

--no-auto-allocate-uids

Disable the auto-allocate-uids setting.

•

--no-auto-optimise-store

Disable the auto-optimise-store setting.

•

--no-builders-use-substitutes

Disable the builders-use-substitutes setting.

•

--no-compress-build-log

Disable the compress-build-log setting.

•

--no-eval-cache

Disable the eval-cache setting.

•

--no-fallback

Disable the fallback setting.

•

--no-filter-syscalls

Disable the filter-syscalls setting.

•

--no-fsync-metadata

Disable the fsync-metadata setting.

•

--no-http2

Disable the http2 setting.

•

--no-ignore-try

Disable the ignore-try setting.

•

--no-impersonate-linux-26

Disable the impersonate-linux-26 setting.

•

--no-keep-build-log

Disable the keep-build-log setting.

•

--no-keep-derivations

Disable the keep-derivations setting.

•

--no-keep-env-derivations

Disable the keep-env-derivations setting.

•

--no-keep-failed

Disable the keep-failed setting.

•

--no-keep-going

Disable the keep-going setting.

•

--no-keep-outputs

Disable the keep-outputs setting.

•

--no-preallocate-contents

Disable the preallocate-contents setting.

•

--no-print-missing

Disable the print-missing setting.

•

--no-pure-eval

Disable the pure-eval setting.

•

--no-require-drop-supplementary-groups

Disable the require-drop-supplementary-groups setting.

•

--no-require-sigs

Disable the require-sigs setting.

•

--no-restrict-eval

Disable the restrict-eval setting.

•

--no-run-diff-hook

Disable the run-diff-hook setting.

•

--no-sandbox

Disable sandboxing.

•

--no-sandbox-fallback

Disable the sandbox-fallback setting.

•

--no-show-trace

Disable the show-trace setting.

•

--no-substitute

Disable the substitute setting.

•

--no-sync-before-registering

Disable the sync-before-registering setting.

•

--no-trace-function-calls

Disable the trace-function-calls setting.

•

--no-trace-verbose

Disable the trace-verbose setting.

•

--no-use-case-hack

Disable the use-case-hack setting.

•

--no-use-cgroups

Disable the use-cgroups setting.

•

--no-use-registries

Disable the use-registries setting.

•

--no-use-sqlite-wal

Disable the use-sqlite-wal setting.

•

--no-use-xdg-base-directories

Disable the use-xdg-base-directories setting.

•

--no-warn-dirty

Disable the warn-dirty setting.

•

--plugin-files value

Set the plugin-files setting.

•

--post-build-hook value

Set the post-build-hook setting.

•

--pre-build-hook value

Set the pre-build-hook setting.

•

--preallocate-contents

Enable the preallocate-contents setting.

•

--print-missing

Enable the print-missing setting.

•

--pure-eval

Enable the pure-eval setting.

•

--relaxed-sandbox

Enable sandboxing, but allow builds to disable it.

•

--require-drop-supplementary-groups

Enable the require-drop-supplementary-groups setting.

•

--require-sigs

Enable the require-sigs setting.

•

--restrict-eval

Enable the restrict-eval setting.

•

--run-diff-hook

Enable the run-diff-hook setting.

•

--sandbox

Enable sandboxing.

•

--sandbox-build-dir value

Set the sandbox-build-dir setting.

•

--sandbox-dev-shm-size value

Set the sandbox-dev-shm-size setting.

•

--sandbox-fallback

Enable the sandbox-fallback setting.

•

--sandbox-paths value

Set the sandbox-paths setting.

•

--secret-key-files value

Set the secret-key-files setting.

•

--show-trace

Enable the show-trace setting.

•

--ssl-cert-file value

Set the ssl-cert-file setting.

•

--stalled-download-timeout value

Set the stalled-download-timeout setting.

•

--start-id value

Set the start-id setting.

•

--store value

Set the store setting.

•

--substitute

Enable the substitute setting.

•

--substituters value

Set the substituters setting.

•

--sync-before-registering

Enable the sync-before-registering setting.

•

--system value

Set the system setting.

•

--system-features value

Set the system-features setting.

•

--tarball-ttl value

Set the tarball-ttl setting.

•

--timeout value

Set the timeout setting.

•

--trace-function-calls

Enable the trace-function-calls setting.

•

--trace-verbose

Enable the trace-verbose setting.

•

--trusted-public-keys value

Set the trusted-public-keys setting.

•

--trusted-substituters value

Set the trusted-substituters setting.

•

--trusted-users value

Set the trusted-users setting.

•

--use-case-hack

Enable the use-case-hack setting.

•

--use-cgroups

Enable the use-cgroups setting.

•

--use-registries

Enable the use-registries setting.

•

--use-sqlite-wal

Enable the use-sqlite-wal setting.

•

--use-xdg-base-directories

Enable the use-xdg-base-directories setting.

•

--user-agent-suffix value

Set the user-agent-suffix setting.

•

--warn-dirty

Enable the warn-dirty setting.