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Eelco Dolstra 2020-07-23 14:28:05 +02:00
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doc/manual/src/command-ref/nix-prefetch-url.md
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@ -31,9 +31,9 @@ hash
# Description
The command `nix-prefetch-url` downloads the file referenced by the URL
url, prints its cryptographic hash, and copies it into the Nix store.
The file name in the store is `hash-baseName`, where baseName is
everything following the final slash in url.
*url*, prints its cryptographic hash, and copies it into the Nix store.
The file name in the store is `hash-baseName`, where *baseName* is
everything following the final slash in *url*.
This command is just a convenience for Nix expression writers. Often a
Nix expression fetches some source distribution from the network using
@ -44,10 +44,10 @@ again when you build your Nix expression. Since `fetchurl` uses the same
name for the downloaded file as `nix-prefetch-url`, the redundant
download can be avoided.
If hash is specified, then a download is not performed if the Nix store
already contains a file with the same hash and base name. Otherwise, the
file is downloaded, and an error is signaled if the actual hash of the
file does not match the specified hash.
If *hash* is specified, then a download is not performed if the Nix
store already contains a file with the same hash and base name.
Otherwise, the file is downloaded, and an error is signaled if the
actual hash of the file does not match the specified hash.
This command prints the hash on standard output. Additionally, if the
option `--print-path` is used, the path of the downloaded file in the
@ -55,7 +55,7 @@ Nix store is also printed.
# Options
- `--type` hashAlgo
- `--type` *hashAlgo*
Use the specified cryptographic hash algorithm, which can be one of
`md5`, `sha1`, and `sha256`.
@ -67,10 +67,10 @@ Nix store is also printed.
result to the Nix store. The resulting hash can be used with
functions such as Nixpkgs’s `fetchzip` or `fetchFromGitHub`.
- `--name` name
- `--name` *name*
Override the name of the file in the Nix store. By default, this is
`hash-basename`, where basename is the last component of url.
Overriding the name is necessary when basename contains characters
`hash-basename`, where *basename* is the last component of *url*.
Overriding the name is necessary when *basename* contains characters
that are not allowed in Nix store paths.
# Examples