forked from lix-project/lix
nix-prefetch-url: Improve option handling
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@ -91,8 +91,9 @@ cryptographic hash as <literal>nix-store --dump
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<varlistentry><term><option>--type</option> <replaceable>hashAlgo</replaceable></term>
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<listitem><para>Specify a cryptographic hash, which can be one of
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<literal>md5</literal>, <literal>sha1</literal>, and
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<listitem><para>Use the specified cryptographic hash algorithm,
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which can be one of <literal>md5</literal>,
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<literal>sha1</literal>, and
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<literal>sha256</literal>.</para></listitem>
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</varlistentry>
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@ -18,6 +18,7 @@
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>nix-prefetch-url</command>
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<arg><option>--type</option> <replaceable>hashAlgo</replaceable></arg>
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<arg choice='plain'><replaceable>url</replaceable></arg>
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<arg><replaceable>hash</replaceable></arg>
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</cmdsynopsis>
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@ -45,11 +46,6 @@ download it again when you build your Nix expression. Since
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as <command>nix-prefetch-url</command>, the redundant download can be
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avoided.</para>
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<para>The environment variable <envar>NIX_HASH_ALGO</envar> specifies
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which hash algorithm to use. It can be either <literal>md5</literal>,
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<literal>sha1</literal>, or <literal>sha256</literal>. The default is
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<literal>sha256</literal>.</para>
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<para>If <replaceable>hash</replaceable> is specified, then a download
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is not performed if the Nix store already contains a file with the
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same hash and base name. Otherwise, the file is downloaded, and an
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@ -63,6 +59,24 @@ of the downloaded file in the Nix store is also printed.</para>
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</refsection>
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<refsection><title>Options</title>
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<variablelist>
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<varlistentry><term><option>--type</option> <replaceable>hashAlgo</replaceable></term>
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<listitem><para>Use the specified cryptographic hash algorithm,
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which can be one of <literal>md5</literal>,
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<literal>sha1</literal>, and
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<literal>sha256</literal>.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsection>
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<refsection><title>Examples</title>
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<screen>
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@ -8,11 +8,28 @@ use Nix::Store;
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use Nix::Config;
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use Nix::Utils;
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my $url = shift;
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my $expHash = shift;
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my $hashType = $ENV{'NIX_HASH_ALGO'} || "sha256";
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my $hashType = $ENV{'NIX_HASH_ALGO'} || "sha256"; # obsolete
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my $cacheDir = $ENV{'NIX_DOWNLOAD_CACHE'};
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my @args;
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my $arg;
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while ($arg = shift) {
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if ($arg eq "--help") {
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exec "man nix-prefetch-url" or die;
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} elsif ($arg eq "--type") {
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$hashType = shift;
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die "$0: `$arg' requires an argument\n" unless defined $hashType;
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} elsif (substr($arg, 0, 1) eq "-") {
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die "$0: unknown flag `$arg'\n";
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} else {
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push @args, $arg;
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}
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}
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my $url = $args[0];
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my $expHash = $args[1];
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if (!defined $url || $url eq "") {
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print STDERR <<EOF
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Usage: nix-prefetch-url URL [EXPECTED-HASH]
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