4 files changed, 20 insertions, 4 deletions
diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index a482ace00c22..8ce8c873d6a3 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -267,7 +267,7 @@ public:
 
 
 MakeError(SubstError, Error)
-MakeError(BuildError, Error) /* denoted a permanent build failure */
+MakeError(BuildError, Error) /* denotes a permanent build failure */
 
 
 //////////////////////////////////////////////////////////////////////
diff --git a/src/libstore/local-store.cc b/src/libstore/local-store.cc
index cf0d559bdfb9..c7530f1b1bae 100644
--- a/src/libstore/local-store.cc
+++ b/src/libstore/local-store.cc
@@ -1036,6 +1036,8 @@ void LocalStore::exportPath(const Path & path, bool sign,
         writeInt(1, hashAndWriteSink);
         
         Path tmpDir = createTempDir();
+        PathLocks tmpDirLock(singleton<PathSet, Path>(tmpDir));
+        tmpDirLock.setDeletion(true);
         AutoDelete delTmp(tmpDir);
         Path hashFile = tmpDir + "/hash";
         writeFile(hashFile, printHash(hash));
@@ -1085,6 +1087,8 @@ Path LocalStore::importPath(bool requireSignature, Source & source)
        store path follows the archive data proper), and besides, we
        don't know yet whether the signature is valid. */
     Path tmpDir = createTempDir(nixStore);
+    PathLocks tmpDirLock(singleton<PathSet, Path>(tmpDir));
+    tmpDirLock.setDeletion(true);
     AutoDelete delTmp(tmpDir); /* !!! could be GC'ed! */
     Path unpacked = tmpDir + "/unpacked";
 
diff --git a/src/libstore/optimise-store.cc b/src/libstore/optimise-store.cc
index d15049201ea4..3ed54e24d773 100644
--- a/src/libstore/optimise-store.cc
+++ b/src/libstore/optimise-store.cc
@@ -119,9 +119,23 @@ static void hashAndLink(bool dryRun, HashToPath & hashToPath,
             }
 
             /* Atomically replace the old file with the new hard link. */
-            if (rename(tempLink.c_str(), path.c_str()) == -1)
+            if (rename(tempLink.c_str(), path.c_str()) == -1) {
+                if (errno == EMLINK) {
+                    /* Some filesystems generate too many links on the
+                       rename, rather than on the original link.
+                       (Probably it temporarily increases the st_nlink
+                       field before decreasing it again.) */
+                    printMsg(lvlInfo, format("`%1%' has maximum number of links") % prevPath.first);
+                    hashToPath[hash] = std::pair<Path, ino_t>(path, st.st_ino);
+
+                    /* Unlink the temp link. */
+                    if (unlink(tempLink.c_str()) == -1)
+                        printMsg(lvlError, format("unable to unlink `%1%'") % tempLink);
+                    return;
+                }
                 throw SysError(format("cannot rename `%1%' to `%2%'")
                     % tempLink % path);
+            }
         } else
             printMsg(lvlTalkative, format("would link `%1%' to `%2%'") % path % prevPath.first);
         
diff --git a/src/libstore/store-api.hh b/src/libstore/store-api.hh
index fbe0cce81e94..3b81bfa39438 100644
--- a/src/libstore/store-api.hh
+++ b/src/libstore/store-api.hh
@@ -16,8 +16,6 @@ namespace nix {
 typedef std::map<Path, Path> Roots;
 
 
-
-
 struct GCOptions
 {
     /* Garbage collector operation: