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authorEelco Dolstra <e.dolstra@tudelft.nl>2008-08-04T13·44+0000
committerEelco Dolstra <e.dolstra@tudelft.nl>2008-08-04T13·44+0000
commita1d310b6b5c710215265c1cd0d5893248ed50f92 (patch)
treebf35d52f339ee027fc749bb63cc3d2bbe5a23f49 /src/nix-store
parent42043953c3558f054dc5b9bb3da605a4a3ed6314 (diff)
* `nix-store --realise': print what paths will be built/downloaded,
  just like nix-env.
* `nix-store --realise': --dry-run option.

Diffstat (limited to 'src/nix-store')
-rw-r--r--src/nix-store/nix-store.cc29
1 files changed, 16 insertions, 13 deletions
diff --git a/src/nix-store/nix-store.cc b/src/nix-store/nix-store.cc
index b59ff27bb30c..0030745b4627 100644
--- a/src/nix-store/nix-store.cc
+++ b/src/nix-store/nix-store.cc
@@ -77,23 +77,26 @@ static Path realisePath(const Path & path)
 /* Realise the given paths. */
 static void opRealise(Strings opFlags, Strings opArgs)
 {
-    if (!opFlags.empty()) throw UsageError("unknown flag");
+    bool dryRun = false;
+    
+    foreach (Strings::iterator, i, opFlags)
+        if (*i == "--dry-run") dryRun = true;
+        else throw UsageError(format("unknown flag `%1%'") % *i);
 
-    for (Strings::iterator i = opArgs.begin();
-         i != opArgs.end(); ++i)
+    foreach (Strings::iterator, i, opArgs)
         *i = followLinksToStorePath(*i);
             
-    if (opArgs.size() > 1) {
-        PathSet drvPaths;
-        for (Strings::iterator i = opArgs.begin();
-             i != opArgs.end(); ++i)
-            if (isDerivation(*i))
-                drvPaths.insert(*i);
-        store->buildDerivations(drvPaths);
-    }
+    printMissing(PathSet(opArgs.begin(), opArgs.end()));
+    
+    if (dryRun) return;
+    
+    /* Build all derivations at the same time to exploit parallelism. */
+    PathSet drvPaths;
+    foreach (Strings::iterator, i, opArgs)
+        if (isDerivation(*i)) drvPaths.insert(*i);
+    store->buildDerivations(drvPaths);
 
-    for (Strings::iterator i = opArgs.begin();
-         i != opArgs.end(); ++i)
+    foreach (Strings::iterator, i,opArgs)
         cout << format("%1%\n") % realisePath(*i);
 }