Merge remote-tracking branch 'origin/master' into flakes

contrib/stack-collapse.py

@@ -1,12 +1,11 @@
 #!/usr/bin/env nix-shell
 #!nix-shell -i python3 -p python3 --pure
 
-# To be used with `--trace-function-calls` and `-vvvv` and
-# `flamegraph.pl`.
+# To be used with `--trace-function-calls` and `flamegraph.pl`.
 #
 # For example:
 #
-# nix-instantiate --trace-function-calls -vvvv '<nixpkgs>' -A hello 2> nix-function-calls.trace
+# nix-instantiate --trace-function-calls '<nixpkgs>' -A hello 2> nix-function-calls.trace
 # ./contrib/stack-collapse.py nix-function-calls.trace > nix-function-calls.folded
 # nix-shell -p flamegraph --run "flamegraph.pl nix-function-calls.folded > nix-function-calls.svg"
 

doc/manual/expressions/builtins.xml

@@ -1605,12 +1605,18 @@ stdenv.mkDerivation (rec {
     <term><function>builtins.tryEval</function>
     <replaceable>e</replaceable></term>
 
-    <listitem><para>Try to evaluate <replaceable>e</replaceable>.
+    <listitem><para>Try to shallowly evaluate <replaceable>e</replaceable>.
     Return a set containing the attributes <literal>success</literal>
     (<literal>true</literal> if <replaceable>e</replaceable> evaluated
     successfully, <literal>false</literal> if an error was thrown) and
     <literal>value</literal>, equalling <replaceable>e</replaceable>
-    if successful and <literal>false</literal> otherwise.
+    if successful and <literal>false</literal> otherwise. Note that this
+    doesn't evaluate <replaceable>e</replaceable> deeply, so
+    <literal>let e = { x = throw ""; }; in (builtins.tryEval e).success
+    </literal> will be <literal>true</literal>. Using <literal>builtins.deepSeq
+    </literal> one can get the expected result: <literal>let e = { x = throw "";
+    }; in (builtins.tryEval (builtins.deepSeq e e)).success</literal> will be
+    <literal>false</literal>.
     </para></listitem>
 
   </varlistentry>

doc/manual/packages/garbage-collection.xml

@@ -52,12 +52,13 @@ garbage collector as follows:
 <screen>
 $ nix-store --gc</screen>
 
-The behaviour of the gargage collector is affected by the <literal>keep-
-derivations</literal> (default: true) and <literal>keep-outputs</literal>
+The behaviour of the gargage collector is affected by the 
+<literal>keep-derivations</literal> (default: true) and <literal>keep-outputs</literal>
 (default: false) options in the Nix configuration file. The defaults will ensure
-that all derivations that are not build-time dependencies of garbage collector roots
-will be collected but that all output paths that are not runtime dependencies
-will be collected. (This is usually what you want, but while you are developing
+that all derivations that are build-time dependencies of garbage collector roots
+will be kept and that all output paths that are runtime dependencies
+will be kept as well. All other derivations or paths will be collected. 
+(This is usually what you want, but while you are developing
 it may make sense to keep outputs to ensure that rebuild times are quick.)
 
 If you are feeling uncertain, you can also first view what files would

src/libexpr/function-trace.hh

@@ -12,13 +12,13 @@ struct FunctionCallTrace
     FunctionCallTrace(const Pos & pos) : pos(pos) {
         auto duration = std::chrono::high_resolution_clock::now().time_since_epoch();
         auto ns = std::chrono::duration_cast<std::chrono::nanoseconds>(duration);
-        vomit("function-trace entered %1% at %2%", pos, ns.count());
+        printMsg(lvlInfo, "function-trace entered %1% at %2%", pos, ns.count());
     }
 
     ~FunctionCallTrace() {
         auto duration = std::chrono::high_resolution_clock::now().time_since_epoch();
         auto ns = std::chrono::duration_cast<std::chrono::nanoseconds>(duration);
-        vomit("function-trace exited %1% at %2%", pos, ns.count());
+        printMsg(lvlInfo, "function-trace exited %1% at %2%", pos, ns.count());
     }
 };
 }

src/libstore/build.cc

@@ -2364,7 +2364,7 @@ void DerivationGoal::startBuilder()
                 child = clone(childEntry, stack + stackSize, flags, this);
             }
             if (child == -1 && (errno == EPERM || errno == EINVAL)) {
-                /* Some distros patch Linux to not allow unpriveleged
+                /* Some distros patch Linux to not allow unprivileged
                  * user namespaces. If we get EPERM or EINVAL, try
                  * without CLONE_NEWUSER and see if that works.
                  */
@@ -2410,8 +2410,7 @@ void DerivationGoal::startBuilder()
         writeFile("/proc/" + std::to_string(pid) + "/gid_map",
             (format("%d %d 1") % sandboxGid % hostGid).str());
 
-        /* Signal the builder that we've updated its user
-           namespace. */
+        /* Signal the builder that we've updated its user namespace. */
         writeFull(userNamespaceSync.writeSide.get(), "1");
         userNamespaceSync.writeSide = -1;
 

src/libstore/gc.cc

@@ -783,7 +783,11 @@ void LocalStore::collectGarbage(const GCOptions & options, GCResults & results)
             assertStorePath(i);
             tryToDelete(state, i);
             if (state.dead.find(i) == state.dead.end())
-                throw Error(format("cannot delete path '%1%' since it is still alive") % i);
+                throw Error(format(
+                    "cannot delete path '%1%' since it is still alive. "
+                    "To find out why use: "
+                    "nix-store --query --roots"
+                    ) % i);
         }
 
     } else if (options.maxFreed > 0) {

src/libstore/remote-store.cc

@@ -198,6 +198,7 @@ void RemoteStore::setOptions(Connection & conn)
         overrides.erase(settings.maxSilentTime.name);
         overrides.erase(settings.buildCores.name);
         overrides.erase(settings.useSubstitutes.name);
+        overrides.erase(settings.showTrace.name);
         conn.to << overrides.size();
         for (auto & i : overrides)
             conn.to << i.first << i.second.value;
@@ -228,7 +229,7 @@ struct ConnectionHandle
 
     ~ConnectionHandle()
     {
-        if (!daemonException && std::uncaught_exceptions()) {
+        if (!daemonException && std::uncaught_exception()) {
             handle.markBad();
             debug("closing daemon connection because of an exception");
         }

src/libutil/json.hh

@@ -170,7 +170,7 @@ public:
 
     ~JSONPlaceholder()
     {
-        assert(!first || std::uncaught_exceptions());
+        assert(!first || std::uncaught_exception());
     }
 
     template<typename T>

src/libutil/util.cc

@@ -1196,7 +1196,7 @@ void _interrupted()
     /* Block user interrupts while an exception is being handled.
        Throwing an exception while another exception is being handled
        kills the program! */
-    if (!interruptThrown && !std::uncaught_exceptions()) {
+    if (!interruptThrown && !std::uncaught_exception()) {
         interruptThrown = true;
         throw Interrupted("interrupted by the user");
     }

tests/function-trace.sh

@@ -8,7 +8,6 @@ expect_trace() {
     actual=$(
         nix-instantiate \
             --trace-function-calls \
-            -vvvv \
             --expr "$expr" 2>&1 \
             | grep "function-trace" \
             | sed -e 's/ [0-9]*$//'