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Allow URLs in the Nix search path

Browse source 
E.g. to install "hello" from the latest Nixpkgs:

  $ nix-build '<nixpkgs>' -A hello -I nixpkgs=https://nixos.org/channels/nixpkgs-unstable/nixexprs.tar.xz

Or to install a specific version of NixOS:

  $ nixos-rebuild switch -I nixpkgs=63def04891.tar.gz
This commit is contained in:
Eelco Dolstra 2015-05-05 17:09:42 +02:00
parent 35d30d67eb
commit 9451ef3731
6 changed files with 123 additions and 99 deletions
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29
src/libexpr/parser.y
View file

@ -527,6 +527,8 @@ formal
#include <unistd.h>
#include <eval.hh>
#include <download.hh>
#include <store-api.hh>
namespace nix {
@ -599,6 +601,15 @@ Expr * EvalState::parseExprFromString(const string & s, const Path & basePath)
}
bool isUri(const string & s)
{
size_t pos = s.find("://");
if (pos == string::npos) return false;
string scheme(s, 0, pos);
return scheme == "http" || scheme == "https";
}
void EvalState::addToSearchPath(const string & s, bool warn)
{
size_t pos = s.find('=');
@ -611,6 +622,9 @@ void EvalState::addToSearchPath(const string & s, bool warn)
path = string(s, pos + 1);
}
if (isUri(path))
path = downloadFileCached(path, true);
path = absPath(path);
if (pathExists(path)) {
debug(format("adding path ‘%1%’ to the search path") % path);
@ -629,16 +643,17 @@ Path EvalState::findFile(const string & path)
Path EvalState::findFile(SearchPath & searchPath, const string & path, const Pos & pos)
{
foreach (SearchPath::iterator, i, searchPath) {
for (auto & i : searchPath) {
assert(!isUri(i.second));
Path res;
if (i->first.empty())
res = i->second + "/" + path;
if (i.first.empty())
res = i.second + "/" + path;
else {
if (path.compare(0, i->first.size(), i->first) != 0 ||
(path.size() > i->first.size() && path[i->first.size()] != '/'))
if (path.compare(0, i.first.size(), i.first) != 0 ||
(path.size() > i.first.size() && path[i.first.size()] != '/'))
continue;
res = i->second +
(path.size() == i->first.size() ? "" : "/" + string(path, i->first.size()));
res = i.second +
(path.size() == i.first.size() ? "" : "/" + string(path, i.first.size()));
}
if (pathExists(res)) return canonPath(res);
}