1 files changed, 46 insertions, 3 deletions
diff --git a/src/libstore/local-fs-store.cc b/src/libstore/local-fs-store.cc
index 4571a2211cd2..bf247903c9db 100644
--- a/src/libstore/local-fs-store.cc
+++ b/src/libstore/local-fs-store.cc
@@ -2,14 +2,13 @@
 #include "fs-accessor.hh"
 #include "store-api.hh"
 #include "globals.hh"
+#include "compression.hh"
+#include "derivations.hh"
 
 namespace nix {
 
 LocalFSStore::LocalFSStore(const Params & params)
     : Store(params)
-    , rootDir(get(params, "root"))
-    , stateDir(canonPath(get(params, "state", rootDir != "" ? rootDir + "/nix/var/nix" : settings.nixStateDir)))
-    , logDir(canonPath(get(params, "log", rootDir != "" ? rootDir + "/nix/var/log/nix" : settings.nixLogDir)))
 {
 }
 
@@ -84,4 +83,48 @@ void LocalFSStore::narFromPath(const Path & path, Sink & sink)
     dumpPath(getRealStoreDir() + std::string(path, storeDir.size()), sink);
 }
 
+const string LocalFSStore::drvsLogDir = "drvs";
+
+
+
+std::shared_ptr<std::string> LocalFSStore::getBuildLog(const Path & path_)
+{
+    auto path(path_);
+
+    assertStorePath(path);
+
+
+    if (!isDerivation(path)) {
+        try {
+            path = queryPathInfo(path)->deriver;
+        } catch (InvalidPath &) {
+            return nullptr;
+        }
+        if (path == "") return nullptr;
+    }
+
+    string baseName = baseNameOf(path);
+
+    for (int j = 0; j < 2; j++) {
+
+        Path logPath =
+            j == 0
+            ? fmt("%s/%s/%s/%s", logDir, drvsLogDir, string(baseName, 0, 2), string(baseName, 2))
+            : fmt("%s/%s/%s", logDir, drvsLogDir, baseName);
+        Path logBz2Path = logPath + ".bz2";
+
+        if (pathExists(logPath))
+            return std::make_shared<std::string>(readFile(logPath));
+
+        else if (pathExists(logBz2Path)) {
+            try {
+                return decompress("bzip2", readFile(logBz2Path));
+            } catch (Error &) { }
+        }
+
+    }
+
+    return nullptr;
+}
+
 }