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Add feature to disable URL literals

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E.g.

  $ nix-build '<nixpkgs>' -A hello --experimental-features no-url-literals
  error: URL literals are disabled, at /nix/store/vsjamkzh15r3c779q2711az826hqgvzr-nixpkgs-20.03pre194957.bef773ed53f/nixpkgs/pkgs/top-level/all-packages.nix:1236:11

Helps with implementing https://github.com/NixOS/rfcs/pull/45.
This commit is contained in:
Eelco Dolstra 2019-11-26 19:48:34 +01:00
parent fc62caa4a5
commit 1ec6e6e11e
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3 changed files with 16 additions and 3 deletions
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8
src/libexpr/parser.y
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@ -20,6 +20,7 @@
#include "nixexpr.hh"
#include "eval.hh"
#include "globals.hh"
namespace nix {
@ -401,7 +402,12 @@ expr_simple
new ExprVar(data->symbols.create("__nixPath"))),
new ExprString(data->symbols.create(path)));
}
| URI { $$ = new ExprString(data->symbols.create($1)); }
| URI {
static bool noURLLiterals = settings.isExperimentalFeatureEnabled("no-url-literals");
if (noURLLiterals)
throw ParseError("URL literals are disabled, at %s", CUR_POS);
$$ = new ExprString(data->symbols.create($1));
}
| '(' expr ')' { $$ = $2; }
/* Let expressions `let {..., body = ...}' are just desugared
into `(rec {..., body = ...}).body'. */