1 files changed, 47 insertions, 0 deletions
diff --git a/src/nix/log.cc b/src/nix/log.cc
new file mode 100644
index 000000000000..ed610261d1ca
--- /dev/null
+++ b/src/nix/log.cc
@@ -0,0 +1,47 @@
+#include "command.hh"
+#include "common-args.hh"
+#include "shared.hh"
+#include "store-api.hh"
+
+using namespace nix;
+
+struct CmdLog : InstallablesCommand
+{
+    CmdLog()
+    {
+    }
+
+    std::string name() override
+    {
+        return "log";
+    }
+
+    std::string description() override
+    {
+        return "show the build log of the specified packages or paths";
+    }
+
+    void run(ref<Store> store) override
+    {
+        auto subs = getDefaultSubstituters();
+
+        subs.push_front(store);
+
+        for (auto & inst : installables) {
+            for (auto & path : inst->toBuildable()) {
+                bool found = false;
+                for (auto & sub : subs) {
+                    auto log = sub->getBuildLog(path);
+                    if (!log) continue;
+                    std::cout << *log;
+                    found = true;
+                    break;
+                }
+                if (!found)
+                    throw Error("build log of path ‘%s’ is not available", path);
+            }
+        }
+    }
+};
+
+static RegisterCommand r1(make_ref<CmdLog>());