nix build: Add --out-link and --no-link options

3 files changed, 24 insertions, 10 deletions

diff --git a/src/nix/build.cc b/src/nix/build.cc
index 64bcafd2d934..4240f06ade7d 100644
--- a/src/nix/build.cc
+++ b/src/nix/build.cc
@@ -7,8 +7,22 @@ using namespace nix;
 
 struct CmdBuild : MixDryRun, InstallablesCommand
 {
+    Path outLink = "result";
+
     CmdBuild()
     {
+        mkFlag()
+            .longName("out-link")
+            .shortName('o')
+            .description("path of the symlink to the build result")
+            .arity(1)
+            .labels({"path"})
+            .dest(&outLink);
+
+        mkFlag()
+            .longName("no-link")
+            .description("do not create a symlink to the build result")
+            .set(&outLink, Path(""));
     }
 
     std::string name() override
@@ -28,14 +42,14 @@ struct CmdBuild : MixDryRun, InstallablesCommand
         for (size_t i = 0; i < buildables.size(); ++i) {
             auto & b(buildables[i]);
 
-            for (auto & output : b.outputs) {
-                if (auto store2 = store.dynamic_pointer_cast<LocalFSStore>()) {
-                    std::string symlink = "result";
-                    if (i) symlink += fmt("-%d", i);
-                    if (output.first != "out") symlink += fmt("-%s", output.first);
-                    store2->addPermRoot(output.second, absPath(symlink), true);
-                }
-            }
+            if (outLink != "")
+                for (auto & output : b.outputs)
+                    if (auto store2 = store.dynamic_pointer_cast<LocalFSStore>()) {
+                        std::string symlink = outLink;
+                        if (i) symlink += fmt("-%d", i);
+                        if (output.first != "out") symlink += fmt("-%s", output.first);
+                        store2->addPermRoot(output.second, absPath(symlink), true);
+                    }
         }
     }
 };
diff --git a/src/nix/copy.cc b/src/nix/copy.cc
index d9e6c949352b..fe963e794277 100644
--- a/src/nix/copy.cc
+++ b/src/nix/copy.cc
@@ -22,7 +22,7 @@ struct CmdCopy : StorePathsCommand
         mkFlag()
             .longName("no-check-sigs")
             .description("do not require that paths are signed by trusted keys")
-            .handler([&](Strings ss) { checkSigs = NoCheckSigs; });
+            .set(&checkSigs, NoCheckSigs);
     }
 
     std::string name() override
diff --git a/src/nix/run.cc b/src/nix/run.cc
index f016b04a1ec8..64a5cbd304d2 100644
--- a/src/nix/run.cc
+++ b/src/nix/run.cc
@@ -41,7 +41,7 @@ struct CmdRun : InstallablesCommand
             .longName("ignore-environment")
             .shortName('i')
             .description("clear the entire environment (except those specified with --keep)")
-            .handler([&](Strings ss) { ignoreEnvironment = true; });
+            .set(&ignoreEnvironment, true);
 
         mkFlag()
             .longName("keep")