Provided by: nix-bin_2.18.1+dfsg-1ubuntu5_amd64 
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Consider all previously downloaded files out-of-date.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.
nix3-store-prefetch-file(1)