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* In nix-instantiate, allow us to specify a "path" to the

Browse source 
derivation(s) we're interested, e.g.,

    $ nix-instantiate ./all-packages.nix --attr xlibs.libX11

  List elements can also be selected:

    $ nix-instantiate ./build-for-release.nix --attr 0.subversion

  This allows a non-ambiguous specification of a derivation.  Of
  course, this should also be added to nix-env and nix-build.
This commit is contained in:
Eelco Dolstra 2006-02-10 17:25:59 +00:00
parent b505f9eaf5
commit c6120352b3
3 changed files with 94 additions and 38 deletions
Download patch file Download diff file Expand all files Collapse all files

15
src/nix-instantiate/main.cc
View file

@ -33,13 +33,14 @@ static int rootNr = 0;
static bool indirectRoot = false;
static void printResult(EvalState & state, Expr e, bool evalOnly)
static void printResult(EvalState & state, Expr e, bool evalOnly,
const string & attrPath)
{
if (evalOnly)
cout << format("%1%\n") % e;
else {
DrvInfos drvs;
getDerivations(state, e, drvs);
getDerivations(state, e, drvs, attrPath);
for (DrvInfos::iterator i = drvs.begin(); i != drvs.end(); ++i) {
Path drvPath = i->queryDrvPath(state);
if (gcRoot == "")
@ -61,6 +62,7 @@ void run(Strings args)
bool readStdin = false;
bool evalOnly = false;
bool parseOnly = false;
string attrPath;
for (Strings::iterator i = args.begin();
i != args.end(); )
@ -82,6 +84,11 @@ void run(Strings args)
throw UsageError("`--add-root requires an argument");
gcRoot = absPath(*i++);
}
else if (arg == "--attr") {
if (i == args.end())
throw UsageError("`--attr requires an argument");
attrPath = *i++;
}
else if (arg == "--indirect")
indirectRoot = true;
else if (arg[0] == '-')
@ -94,7 +101,7 @@ void run(Strings args)
if (readStdin) {
Expr e = evalStdin(state, parseOnly);
printResult(state, e, evalOnly);
printResult(state, e, evalOnly, attrPath);
}
for (Strings::iterator i = files.begin();
@ -104,7 +111,7 @@ void run(Strings args)
Expr e = parseOnly
? parseExprFromFile(state, path)
: evalFile(state, path);
printResult(state, e, evalOnly);
printResult(state, e, evalOnly, attrPath);
}
printEvalStats(state);