630ae0c9d7
get rid of GC roots. Nix-build places a symlink `result' in the current directory. Previously, removing that symlink would not remove the store path being linked to as a GC root. Now, the GC root created by nix-build is actually a symlink in `/nix/var/nix/gcroots/auto' to `result'. So if that symlink is removed the GC root automatically becomes invalid (since it can no longer be resolved). The root itself is not automatically removed - the garbage collector should delete dangling roots.
144 lines
3.6 KiB
C++
144 lines
3.6 KiB
C++
#include <map>
|
|
#include <iostream>
|
|
|
|
#include "globals.hh"
|
|
#include "build.hh"
|
|
#include "gc.hh"
|
|
#include "shared.hh"
|
|
#include "eval.hh"
|
|
#include "parser.hh"
|
|
#include "nixexpr-ast.hh"
|
|
#include "help.txt.hh"
|
|
|
|
|
|
void printHelp()
|
|
{
|
|
cout << string((char *) helpText, sizeof helpText);
|
|
}
|
|
|
|
|
|
static Expr evalStdin(EvalState & state, bool parseOnly)
|
|
{
|
|
startNest(nest, lvlTalkative, format("evaluating standard input"));
|
|
string s, s2;
|
|
while (getline(cin, s2)) s += s2 + "\n";
|
|
Expr e = parseExprFromString(state, s, absPath("."));
|
|
return parseOnly ? e : evalExpr(state, e);
|
|
}
|
|
|
|
|
|
static Path gcRoot;
|
|
static int rootNr = 0;
|
|
static bool indirectRoot = false;
|
|
|
|
|
|
/* Print out the paths of the resulting derivation(s). If the user
|
|
specified the `--add-root' flag, we register the derivation as a
|
|
garbage collection root and print out the path of the GC root
|
|
symlink instead. */
|
|
static void printDrvPaths(EvalState & state, Expr e)
|
|
{
|
|
ATermList es;
|
|
|
|
/* !!! duplication w.r.t. parseDerivations in nix-env */
|
|
|
|
if (matchAttrs(e, es)) {
|
|
Expr a = queryAttr(e, "type");
|
|
if (a && evalString(state, a) == "derivation") {
|
|
a = queryAttr(e, "drvPath");
|
|
if (a) {
|
|
Path drvPath = evalPath(state, a);
|
|
if (gcRoot == "")
|
|
printGCWarning();
|
|
else
|
|
drvPath = addPermRoot(drvPath,
|
|
makeRootName(gcRoot, rootNr),
|
|
indirectRoot);
|
|
cout << format("%1%\n") % drvPath;
|
|
return;
|
|
}
|
|
throw Error("bad derivation");
|
|
} else {
|
|
ATermMap drvMap;
|
|
queryAllAttrs(e, drvMap);
|
|
for (ATermIterator i(drvMap.keys()); i; ++i)
|
|
printDrvPaths(state, evalExpr(state, drvMap.get(*i)));
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (matchList(e, es)) {
|
|
for (ATermIterator i(es); i; ++i)
|
|
printDrvPaths(state, evalExpr(state, *i));
|
|
return;
|
|
}
|
|
|
|
throw Error("expression does not evaluate to one or more derivations");
|
|
}
|
|
|
|
|
|
static void printResult(EvalState & state, Expr e, bool evalOnly)
|
|
{
|
|
if (evalOnly)
|
|
cout << format("%1%\n") % e;
|
|
else
|
|
printDrvPaths(state, e);
|
|
}
|
|
|
|
|
|
void run(Strings args)
|
|
{
|
|
EvalState state;
|
|
Strings files;
|
|
bool readStdin = false;
|
|
bool evalOnly = false;
|
|
bool parseOnly = false;
|
|
|
|
for (Strings::iterator i = args.begin();
|
|
i != args.end(); )
|
|
{
|
|
string arg = *i++;
|
|
|
|
if (arg == "-")
|
|
readStdin = true;
|
|
else if (arg == "--eval-only") {
|
|
readOnlyMode = true;
|
|
evalOnly = true;
|
|
}
|
|
else if (arg == "--parse-only") {
|
|
readOnlyMode = true;
|
|
parseOnly = evalOnly = true;
|
|
}
|
|
else if (arg == "--add-root") {
|
|
if (i == args.end())
|
|
throw UsageError("`--add-root requires an argument");
|
|
gcRoot = absPath(*i++);
|
|
}
|
|
else if (arg == "--indirect")
|
|
indirectRoot = true;
|
|
else if (arg[0] == '-')
|
|
throw UsageError(format("unknown flag `%1%`") % arg);
|
|
else
|
|
files.push_back(arg);
|
|
}
|
|
|
|
openDB();
|
|
|
|
if (readStdin) {
|
|
Expr e = evalStdin(state, parseOnly);
|
|
printResult(state, e, evalOnly);
|
|
}
|
|
|
|
for (Strings::iterator i = files.begin();
|
|
i != files.end(); i++)
|
|
{
|
|
Expr e = evalFile(state, absPath(*i));
|
|
/* !!! parseOnly ignored */
|
|
printResult(state, e, evalOnly);
|
|
}
|
|
|
|
printEvalStats(state);
|
|
}
|
|
|
|
|
|
string programId = "nix-instantiate";
|