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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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89
src/libexpr/download.cc
View file

@ -1,6 +1,8 @@
#include "download.hh"
#include "util.hh"
#include "globals.hh"
#include "hash.hh"
#include "store-api.hh"
#include <curl/curl.h>
@ -134,4 +136,91 @@ DownloadResult downloadFile(string url, string expectedETag)
return res;
}
Path downloadFileCached(const string & url, bool unpack)
{
Path cacheDir = getEnv("XDG_CACHE_HOME", getEnv("HOME", "") + "/.cache") + "/nix/tarballs";
createDirs(cacheDir);
string urlHash = printHash32(hashString(htSHA256, url));
Path dataFile = cacheDir + "/" + urlHash + ".info";
Path fileLink = cacheDir + "/" + urlHash + "-file";
Path storePath;
string expectedETag;
int ttl = settings.get("tarball-ttl", 60 * 60);
bool skip = false;
if (pathExists(fileLink) && pathExists(dataFile)) {
storePath = readLink(fileLink);
store->addTempRoot(storePath);
if (store->isValidPath(storePath)) {
auto ss = tokenizeString<vector<string>>(readFile(dataFile), "\n");
if (ss.size() >= 3 && ss[0] == url) {
time_t lastChecked;
if (string2Int(ss[2], lastChecked) && lastChecked + ttl >= time(0))
skip = true;
else if (!ss[1].empty()) {
printMsg(lvlDebug, format("verifying previous ETag ‘%1%’") % ss[1]);
expectedETag = ss[1];
}
}
} else
storePath = "";
}
string name;
auto p = url.rfind('/');
if (p != string::npos) name = string(url, p + 1);
if (!skip) {
if (storePath.empty())
printMsg(lvlInfo, format("downloading ‘%1%’...") % url);
else
printMsg(lvlInfo, format("checking ‘%1%’...") % url);
try {
auto res = downloadFile(url, expectedETag);
if (!res.cached)
storePath = store->addTextToStore(name, res.data, PathSet(), false);
assert(!storePath.empty());
replaceSymlink(storePath, fileLink);
writeFile(dataFile, url + "\n" + res.etag + "\n" + int2String(time(0)) + "\n");
} catch (DownloadError & e) {
if (storePath.empty()) throw;
printMsg(lvlError, format("warning: %1%; using cached result") % e.msg());
}
}
if (unpack) {
Path unpackedLink = cacheDir + "/" + baseNameOf(storePath) + "-unpacked";
Path unpackedStorePath;
if (pathExists(unpackedLink)) {
unpackedStorePath = readLink(unpackedLink);
store->addTempRoot(unpackedStorePath);
if (!store->isValidPath(unpackedStorePath))
unpackedStorePath = "";
}
if (unpackedStorePath.empty()) {
printMsg(lvlInfo, format("unpacking ‘%1%’...") % url);
Path tmpDir = createTempDir();
AutoDelete autoDelete(tmpDir, true);
runProgram("tar", true, {"xf", storePath, "-C", tmpDir, "--strip-components", "1"}, "");
unpackedStorePath = store->addToStore(name, tmpDir, true, htSHA256, defaultPathFilter, false);
}
replaceSymlink(unpackedStorePath, unpackedLink);
return unpackedStorePath;
}
return storePath;
}
}

2
src/libexpr/download.hh
View file

@ -13,6 +13,8 @@ struct DownloadResult
DownloadResult downloadFile(string url, string expectedETag = "");
Path downloadFileCached(const string & url, bool unpack);
MakeError(DownloadError, Error)
}

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);
}

88
src/libexpr/primops.cc
View file

@ -103,7 +103,7 @@ static void prim_scopedImport(EvalState & state, const Pos & pos, Value * * args
}
w.attrs->sort();
Value fun;
state.evalFile(state.findFile("nix/imported-drv-to-derivation.nix"), fun);
state.evalFile(settings.nixDataDir + "/nix/corepkgs/imported-drv-to-derivation.nix", fun);
state.forceFunction(fun, pos);
mkApp(v, fun, w);
state.forceAttrs(v, pos);
@ -1512,88 +1512,7 @@ void fetch(EvalState & state, const Pos & pos, Value * * args, Value & v,
} else
url = state.forceStringNoCtx(*args[0], pos);
Path cacheDir = getEnv("XDG_CACHE_HOME", getEnv("HOME", "") + "/.cache") + "/nix/tarballs";
createDirs(cacheDir);
string urlHash = printHash32(hashString(htSHA256, url));
Path dataFile = cacheDir + "/" + urlHash + ".info";
Path fileLink = cacheDir + "/" + urlHash + "-file";
Path storePath;
string expectedETag;
int ttl = settings.get("tarball-ttl", 60 * 60);
bool skip = false;
if (pathExists(fileLink) && pathExists(dataFile)) {
storePath = readLink(fileLink);
store->addTempRoot(storePath);
if (store->isValidPath(storePath)) {
auto ss = tokenizeString<vector<string>>(readFile(dataFile), "\n");
if (ss.size() >= 3 && ss[0] == url) {
time_t lastChecked;
if (string2Int(ss[2], lastChecked) && lastChecked + ttl >= time(0))
skip = true;
else if (!ss[1].empty()) {
printMsg(lvlDebug, format("verifying previous ETag ‘%1%’") % ss[1]);
expectedETag = ss[1];
}
}
} else
storePath = "";
}
string name;
auto p = url.rfind('/');
if (p != string::npos) name = string(url, p + 1);
if (!skip) {
if (storePath.empty())
printMsg(lvlInfo, format("downloading ‘%1%’...") % url);
else
printMsg(lvlInfo, format("checking ‘%1%’...") % url);
try {
auto res = downloadFile(url, expectedETag);
if (!res.cached)
storePath = store->addTextToStore(name, res.data, PathSet(), state.repair);
assert(!storePath.empty());
replaceSymlink(storePath, fileLink);
writeFile(dataFile, url + "\n" + res.etag + "\n" + int2String(time(0)) + "\n");
} catch (DownloadError & e) {
if (storePath.empty()) throw;
printMsg(lvlError, format("warning: %1%; using cached result") % e.msg());
}
}
if (unpack) {
Path unpackedLink = cacheDir + "/" + baseNameOf(storePath) + "-unpacked";
Path unpackedStorePath;
if (pathExists(unpackedLink)) {
unpackedStorePath = readLink(unpackedLink);
store->addTempRoot(unpackedStorePath);
if (!store->isValidPath(unpackedStorePath))
unpackedStorePath = "";
}
if (unpackedStorePath.empty()) {
printMsg(lvlDebug, format("unpacking ‘%1%’...") % storePath);
Path tmpDir = createTempDir();
AutoDelete autoDelete(tmpDir, true);
runProgram("tar", true, {"xf", storePath, "-C", tmpDir, "--strip-components", "1"}, "");
unpackedStorePath = store->addToStore(name, tmpDir, true, htSHA256, defaultPathFilter, state.repair);
}
replaceSymlink(unpackedStorePath, unpackedLink);
mkString(v, unpackedStorePath, singleton<PathSet>(unpackedStorePath));
}
else
mkString(v, storePath, singleton<PathSet>(storePath));
mkString(v, downloadFileCached(url, unpack), PathSet({url}));
}
@ -1753,8 +1672,7 @@ void EvalState::createBaseEnv()
/* Add a wrapper around the derivation primop that computes the
`drvPath' and `outPath' attributes lazily. */
string path = findFile("nix/derivation.nix");
assert(!path.empty());
string path = settings.nixDataDir + "/nix/corepkgs/derivation.nix";
sDerivationNix = symbols.create(path);
evalFile(path, v);
addConstant("derivation", v);

4
src/nix-env/nix-env.cc
View file

@ -1423,6 +1423,8 @@ int main(int argc, char * * argv)
if (!op) throw UsageError("no operation specified");
store = openStore();
globals.state = std::shared_ptr<EvalState>(new EvalState(searchPath));
globals.state->repair = repair;
@ -1441,8 +1443,6 @@ int main(int argc, char * * argv)
: canonPath(settings.nixStateDir + "/profiles/default");
}
store = openStore();
op(globals, opFlags, opArgs);
globals.state->printStats();

10
src/nix-instantiate/nix-instantiate.cc
View file

@ -155,14 +155,16 @@ int main(int argc, char * * argv)
return true;
});
if (evalOnly && !wantsReadWrite)
settings.readOnlyMode = true;
store = openStore();
EvalState state(searchPath);
state.repair = repair;
Bindings & autoArgs(*evalAutoArgs(state, autoArgs_));
if (evalOnly && !wantsReadWrite)
settings.readOnlyMode = true;
if (attrPaths.empty()) attrPaths.push_back("");
if (findFile) {
@ -174,8 +176,6 @@ int main(int argc, char * * argv)
return;
}
store = openStore();
if (readStdin) {
Expr * e = parseStdin(state);
processExpr(state, attrPaths, parseOnly, strict, autoArgs,