forked from lix-project/lix
nix-prefetch-url: Support prefetching from a Nix expression
For example, $ nix-prefetch-url -A hello.src will prefetch the file specified by the fetchurl call in the attribute ‘hello.src’ from the Nix expression in the current directory. This differs from ‘nix-build -A hello.src’ in that it doesn't verify the hash. You can also specify a path to the Nix expression: $ nix-prefetch-url ~/Dev/nixpkgs -A hello.src List elements (typically used in ‘patches’ attributes) also work: $ nix-prefetch-url -A portmidi.patches.0
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@ -20,6 +20,7 @@
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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><option>--print-path</option></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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@ -5,6 +5,7 @@
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#include "eval.hh"
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#include "eval-inline.hh"
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#include "common-opts.hh"
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#include "attr-path.hh"
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#include <iostream>
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@ -49,6 +50,9 @@ int main(int argc, char * * argv)
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std::vector<string> args;
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Strings searchPath;
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bool printPath = getEnv("PRINT_PATH") != "";
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bool fromExpr = false;
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string attrPath;
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std::map<string, string> autoArgs_;
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parseCmdLine(argc, argv, [&](Strings::iterator & arg, const Strings::iterator & end) {
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if (*arg == "--help")
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@ -63,6 +67,12 @@ int main(int argc, char * * argv)
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}
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else if (*arg == "--print-path")
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printPath = true;
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else if (*arg == "--attr" || *arg == "-A") {
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fromExpr = true;
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attrPath = getArg(*arg, arg, end);
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}
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else if (parseAutoArgs(arg, end, autoArgs_))
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;
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else if (parseSearchPathArg(arg, end, searchPath))
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;
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else if (*arg != "" && arg->at(0) == '-')
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@ -72,15 +82,37 @@ int main(int argc, char * * argv)
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return true;
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});
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if (args.size() < 1 || args.size() > 2)
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throw UsageError("nix-prefetch-url expects one argument");
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if (args.size() > 2)
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throw UsageError("too many arguments");
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store = openStore();
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EvalState state(searchPath);
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Bindings & autoArgs(*evalAutoArgs(state, autoArgs_));
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/* If -A is given, get the URI from the specified Nix
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expression. */
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string uri;
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if (!fromExpr) {
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if (args.empty())
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throw UsageError("you must specify a URI");
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uri = args[0];
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} else {
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Path path = resolveExprPath(lookupFileArg(state, args.empty() ? "." : args[0]));
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Value vRoot;
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state.evalFile(path, vRoot);
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Value & v(*findAlongAttrPath(state, attrPath, autoArgs, vRoot));
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state.forceAttrs(v);
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auto urls = v.attrs->find(state.symbols.create("urls"));
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if (urls == v.attrs->end())
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throw Error("attribute set does not contain a ‘urls’ attribute");
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state.forceList(*urls->value);
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if (urls->value->listSize() < 1)
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throw Error("‘urls’ list is empty");
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uri = state.forceString(*urls->value->listElems()[0]);
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}
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/* Figure out a name in the Nix store. */
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auto uri = args[0];
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auto name = baseNameOf(uri);
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if (name.empty())
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throw Error(format("cannot figure out file name for ‘%1%’") % uri);
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