Fix build on macOS

src/libstore/build/local-derivation-goal.cc

@@ -659,7 +659,7 @@ void LocalDerivationGoal::startBuilder()
         }
 
 #else
-        if (useUidRange)
+        if (parsedDrv->useUidRange())
             throw Error("feature 'uid-range' is not supported on this platform");
         if (useSystemdCgroup)
             throw Error("feature 'systemd-cgroup' is not supported on this platform");

src/libstore/globals.hh

@@ -46,7 +46,13 @@ struct PluginFilesSetting : public BaseSetting<Paths>
     void set(const std::string & str, bool append = false) override;
 };
 
-const uint32_t maxIdsPerBuild = 1 << 16;
+const uint32_t maxIdsPerBuild =
+    #if __linux__
+    1 << 16
+    #else
+    1
+    #endif
+    ;
 
 class Settings : public Config {
 
@@ -277,16 +283,26 @@ public:
           multi-user settings with untrusted users.
         )"};
 
-    #if __linux__
     Setting<bool> autoAllocateUids{this, false, "auto-allocate-uids",
         "Whether to allocate UIDs for builders automatically."};
 
-    Setting<uint32_t> startId{this, 872415232, "start-id",
+    Setting<uint32_t> startId{this,
+        #if __linux__
+        872415232,
+        #else
+        56930,
+        #endif
+        "start-id",
         "The first UID and GID to use for dynamic ID allocation."};
 
-    Setting<uint32_t> uidCount{this, maxIdsPerBuild * 128, "id-count",
-        "The number of UIDs/GIDs to use for dynamic ID allocation."};
+    Setting<uint32_t> uidCount{this,
+        #if __linux__
+        maxIdsPerBuild * 128,
+        #else
+        128,
         #endif
+        "id-count",
+        "The number of UIDs/GIDs to use for dynamic ID allocation."};
 
     Setting<bool> impersonateLinux26{this, false, "impersonate-linux-26",
         "Whether to impersonate a Linux 2.6 machine on newer kernels.",

src/libstore/lock.cc

@@ -122,15 +122,16 @@ struct AutoUserLock : UserLock
 
     ~AutoUserLock()
     {
+        #if __linux__
         // Get rid of our cgroup, ignoring errors.
         if (cgroup) rmdir(cgroup->c_str());
+        #endif
     }
 
     void kill() override
     {
         #if __linux__
         if (cgroup) {
-            printError("KILL CGROUP %s", *cgroup);
             destroyCgroup(*cgroup);
             if (mkdir(cgroup->c_str(), 0755) == -1)
                 throw SysError("creating cgroup '%s'", *cgroup);
@@ -138,7 +139,6 @@ struct AutoUserLock : UserLock
         #endif
         {
             assert(firstUid);
-            printError("KILL USER %d", firstUid);
             killUser(firstUid);
         }
     }
@@ -201,6 +201,7 @@ struct AutoUserLock : UserLock
                 lock->firstUid = settings.startId + i * maxIdsPerBuild;
                 lock->nrIds = nrIds;
 
+                #if __linux__
                 if (nrIds > 1) {
                     auto ourCgroups = getCgroups("/proc/self/cgroup");
                     auto ourCgroup = ourCgroups[""];
@@ -209,20 +210,17 @@ struct AutoUserLock : UserLock
 
                     auto ourCgroupPath = canonPath("/sys/fs/cgroup/" + ourCgroup);
 
-                    printError("PARENT CGROUP = %s", ourCgroupPath);
-
                     if (!pathExists(ourCgroupPath))
                         throw Error("expected cgroup directory '%s'", ourCgroupPath);
 
                     lock->cgroup = fmt("%s/nix-build-%d", ourCgroupPath, lock->firstUid);
 
-                    printError("CHILD CGROUP = %s", *lock->cgroup);
-
                     /* Record the cgroup in the lock file. This ensures that
                        if we subsequently get executed under a different parent
                        cgroup, we kill the previous cgroup first. */
                     writeFull(lock->fdUserLock.get(), *lock->cgroup);
                 }
+                #endif
 
                 return lock;
             }

src/libstore/lock.hh

@@ -4,6 +4,8 @@
 
 #include <optional>
 
+#include <sys/types.h>
+
 namespace nix {
 
 struct UserLock