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https://github.com/privatevoid-net/nix-super.git
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Merge branch 'shlevy-import-native'
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commit
d7be6d45d9
4 changed files with 50 additions and 0 deletions
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@ -8,6 +8,8 @@ libexpr_SOURCES := $(wildcard $(d)/*.cc) $(d)/lexer-tab.cc $(d)/parser-tab.cc
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libexpr_LIBS = libutil libstore libformat
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libexpr_LDFLAGS = -ldl
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# The dependency on libgc must be propagated (i.e. meaning that
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# programs/libraries that use libexpr must explicitly pass -lgc),
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# because inline functions in libexpr's header files call libgc.
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@ -15,6 +15,7 @@
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#include <algorithm>
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#include <cstring>
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#include <dlfcn.h>
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namespace nix {
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@ -129,6 +130,46 @@ static void prim_scopedImport(EvalState & state, const Pos & pos, Value * * args
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}
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/* Want reasonable symbol names, so extern C */
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/* !!! Should we pass the Pos or the file name too? */
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extern "C" typedef void (*ValueInitializer)(EvalState & state, Value & v);
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/* Load a ValueInitializer from a dso and return whatever it initializes */
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static void prim_importNative(EvalState & state, const Pos & pos, Value * * args, Value & v)
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{
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PathSet context;
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Path path = state.coerceToPath(pos, *args[0], context);
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try {
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realiseContext(context);
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} catch (InvalidPathError & e) {
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throw EvalError(format("cannot import `%1%', since path `%2%' is not valid, at %3%")
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% path % e.path % pos);
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}
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string sym = state.forceStringNoCtx(*args[1], pos);
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void *handle = dlopen(path.c_str(), RTLD_LAZY | RTLD_LOCAL);
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if (!handle)
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throw EvalError(format("could not open `%1%': %2%") % path % dlerror());
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dlerror();
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ValueInitializer func = (ValueInitializer) dlsym(handle, sym.c_str());
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if(!func) {
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char *message = dlerror();
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if (message)
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throw EvalError(format("could not load symbol `%1%' from `%2%': %3%") % sym % path % message);
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else
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throw EvalError(format("symbol `%1%' from `%2%' resolved to NULL when a function pointer was expected")
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% sym % path);
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}
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(func)(state, v);
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/* We don't dlclose because v may be a primop referencing a function in the shared object file */
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}
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/* Return a string representing the type of the expression. */
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static void prim_typeOf(EvalState & state, const Pos & pos, Value * * args, Value & v)
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{
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@ -1327,6 +1368,8 @@ void EvalState::createBaseEnv()
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mkApp(v, *baseEnv.values[baseEnvDispl - 1], *v2);
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forceValue(v);
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addConstant("import", v);
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if (settings.enableImportNative)
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addPrimOp("__importNative", 2, prim_importNative);
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addPrimOp("__typeOf", 1, prim_typeOf);
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addPrimOp("isNull", 1, prim_isNull);
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addPrimOp("__isFunction", 1, prim_isFunction);
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@ -61,6 +61,7 @@ Settings::Settings()
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envKeepDerivations = false;
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lockCPU = getEnv("NIX_AFFINITY_HACK", "1") == "1";
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showTrace = false;
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enableImportNative = false;
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}
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@ -148,6 +149,7 @@ void Settings::update()
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get(sshSubstituterHosts, "ssh-substituter-hosts");
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get(useSshSubstituter, "use-ssh-substituter");
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get(logServers, "log-servers");
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get(enableImportNative, "allow-arbitrary-code-during-evaluation");
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string subs = getEnv("NIX_SUBSTITUTERS", "default");
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if (subs == "default") {
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@ -200,6 +200,9 @@ struct Settings {
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/* A list of URL prefixes that can return Nix build logs. */
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Strings logServers;
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/* Whether the importNative primop should be enabled */
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bool enableImportNative;
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private:
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SettingsMap settings, overrides;
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