From e9d0448929a46df1b5923d69989fa3ca4c9e47ba Mon Sep 17 00:00:00 2001
From: Astro <astro@spaceboyz.net>
Date: Thu, 5 Nov 2020 17:21:09 +0100
Subject: [PATCH] networked derivations

---
 src/libstore/build/derivation-goal.cc | 14 ++++++++------
 src/libstore/build/derivation-goal.hh |  6 ++++++
 2 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/src/libstore/build/derivation-goal.cc b/src/libstore/build/derivation-goal.cc
index bf2bad62c..ef4ce8a0b 100644
--- a/src/libstore/build/derivation-goal.cc
+++ b/src/libstore/build/derivation-goal.cc
@@ -1199,6 +1199,8 @@ void DerivationGoal::startBuilder()
     additionalSandboxProfile = parsedDrv->getStringAttr("__sandboxProfile").value_or("");
 #endif
 
+    networked = parsedDrv->getBoolAttr("__networked");
+
     /* Are we doing a chroot build? */
     {
         auto noChroot = parsedDrv->getBoolAttr("__noChroot");
@@ -1216,7 +1218,7 @@ 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) {
@@ -1430,7 +1432,7 @@ void DerivationGoal::startBuilder()
                 "nogroup:x:65534:\n", sandboxGid()));
 
         /* Create /etc/hosts with localhost entry. */
-        if (!(derivationIsImpure(derivationType)))
+        if (!allowNetwork() && !(derivationIsImpure(derivationType)))
             writeFile(chrootRootDir + "/etc/hosts", "127.0.0.1 localhost\n::1 localhost\n");
 
         /* Make the closure of the inputs available in the chroot,
@@ -1617,7 +1619,7 @@ void DerivationGoal::startBuilder()
            us.
         */
 
-        if (!(derivationIsImpure(derivationType)))
+        if (!allowNetwork() && !(derivationIsImpure(derivationType)))
             privateNetwork = true;
 
         userNamespaceSync.create();
@@ -1865,7 +1867,7 @@ 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() || derivationIsImpure(derivationType)) {
         for (auto & i : parsedDrv->getStringsAttr("impureEnvVars").value_or(Strings()))
             env[i] = getEnv(i).value_or("");
     }
@@ -2487,7 +2489,7 @@ 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() || derivationIsImpure(derivationType)) {
                 ss.push_back("/etc/resolv.conf");
 
                 // Only use nss functions to resolve hosts and
@@ -2728,7 +2730,7 @@ void DerivationGoal::runChild()
 
                 sandboxProfile += "(import \"sandbox-defaults.sb\")\n";
 
-                if (derivationIsImpure(derivationType))
+                if (allowNetwork() || derivationIsImpure(derivationType))
                     sandboxProfile += "(import \"sandbox-network.sb\")\n";
 
                 /* Add the output paths we'll use at build-time to the chroot */
diff --git a/src/libstore/build/derivation-goal.hh b/src/libstore/build/derivation-goal.hh
index 4976207e0..c57238403 100644
--- a/src/libstore/build/derivation-goal.hh
+++ b/src/libstore/build/derivation-goal.hh
@@ -134,6 +134,12 @@ private:
     /* Whether to run the build in a private network namespace. */
     bool privateNetwork = false;
 
+    bool networked;
+    bool allowNetwork()
+    {
+        return derivationIsFixed(drv->type()) || networked;
+    }
+
     typedef void (DerivationGoal::*GoalState)();
     GoalState state;
 
-- 
2.29.0