From d7fc00b5770a7d194c0ba9e70a4cdb2ece621d5b Mon Sep 17 00:00:00 2001
From: Astro <astro@spaceboyz.net>
Date: Mon, 5 Oct 2020 14:18:59 +0200
Subject: [PATCH] networked derivations

---
 src/libstore/build.cc | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index 0499273a4..40fe4e859 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -845,9 +845,16 @@ private:
     /* The sort of derivation we are building. */
     DerivationType derivationType;
 
+    bool networked;
+
     /* Whether to run the build in a private network namespace. */
     bool privateNetwork = false;
 
+    bool allowNetwork()
+    {
+        return derivationIsFixed(drv->type()) || networked;
+    }
+
     typedef void (DerivationGoal::*GoalState)();
     GoalState state;
 
@@ -1293,6 +1300,8 @@ void DerivationGoal::haveDerivation()
     parsedDrv = std::make_unique<ParsedDerivation>(drvPath, *drv);
 
 
+    networked = parsedDrv->getBoolAttr("__networked");
+
     /* We are first going to try to create the invalid output paths
        through substitutes.  If that doesn't work, we'll build
        them. */
@@ -2210,7 +2219,7 @@ void DerivationGoal::startBuilder()
         else if (settings.sandboxMode == smDisabled)
             useChroot = false;
         else if (settings.sandboxMode == smRelaxed)
-            useChroot = !(derivationIsImpure(derivationType)) && !noChroot;
+            useChroot = !allowNetwork() && !(derivationIsImpure(derivationType)) && !noChroot;
     }
 
     if (worker.store.storeDir != worker.store.realStoreDir) {
@@ -2434,7 +2443,7 @@ void DerivationGoal::startBuilder()
                 "nogroup:x:65534:\n") % sandboxGid).str());
 
         /* Create /etc/hosts with localhost entry. */
-        if (!(derivationIsImpure(derivationType)))
+        if (!allowNetwork())
             writeFile(chrootRootDir + "/etc/hosts", "127.0.0.1 localhost\n::1 localhost\n");
 
         /* Make the closure of the inputs available in the chroot,
@@ -2621,7 +2630,7 @@ void DerivationGoal::startBuilder()
            us.
         */
 
-        if (!(derivationIsImpure(derivationType)))
+        if (!allowNetwork())
             privateNetwork = true;
 
         userNamespaceSync.create();
@@ -2833,7 +2842,7 @@ void DerivationGoal::initEnv()
        to the builder is generally impure, but the output of
        fixed-output derivations is by definition pure (since we
        already know the cryptographic hash of the output). */
-    if (derivationIsImpure(derivationType)) {
+    if (allowNetwork()) {
         for (auto & i : parsedDrv->getStringsAttr("impureEnvVars").value_or(Strings()))
             env[i] = getEnv(i).value_or("");
     }
@@ -3447,7 +3456,7 @@ void DerivationGoal::runChild()
             /* Fixed-output derivations typically need to access the
                network, so give them access to /etc/resolv.conf and so
                on. */
-            if (derivationIsImpure(derivationType)) {
+            if (allowNetwork()) {
                 ss.push_back("/etc/resolv.conf");
 
                 // Only use nss functions to resolve hosts and
-- 
2.28.0