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authorEelco Dolstra <e.dolstra@tudelft.nl>2008-08-02T12·54+0000
committerEelco Dolstra <e.dolstra@tudelft.nl>2008-08-02T12·54+0000
commit3c92ea399d717dc45b3fa91424c0dadc0239ebf2 (patch)
tree7cde9f533a6ee575615da5452e04c05dc0939f02 /src/libstore/store-api.hh
parentfc691e1cbdcddb8c553cba06d4089bc1b60e3d98 (diff)
* Make nix-env --dry-run print the paths to be substituted correctly
  again.  (After the previous substituter mechanism refactoring I
  didn't update the code that obtains the references of substitutable
  paths.)  This required some refactoring: the substituter programs
  are now kept running and receive/respond to info requests via
  stdin/stdout.

Diffstat (limited to 'src/libstore/store-api.hh')
-rw-r--r--src/libstore/store-api.hh19
1 files changed, 14 insertions, 5 deletions
diff --git a/src/libstore/store-api.hh b/src/libstore/store-api.hh
index b2a2dc7a53ec..9645237e0430 100644
--- a/src/libstore/store-api.hh
+++ b/src/libstore/store-api.hh
@@ -88,6 +88,14 @@ struct GCResults
 };
 
 
+struct SubstitutablePathInfo
+{
+    Path deriver;
+    PathSet references;
+    unsigned long long downloadSize; /* 0 = unknown or inapplicable */
+};
+
+
 class StoreAPI 
 {
 public:
@@ -117,12 +125,13 @@ public:
        no deriver has been set. */
     virtual Path queryDeriver(const Path & path) = 0;
 
-    /* Query the set of substitutable paths. */
-    virtual PathSet querySubstitutablePaths() = 0;
+    /* Query whether a path has substitutes. */
+    virtual bool hasSubstitutes(const Path & path) = 0;
 
-    /* More efficient variant if we just want to know if a path has
-       substitutes. */
-    virtual bool hasSubstitutes(const Path & path);
+    /* Query the references, deriver and download size of a
+       substitutable path. */
+    virtual bool querySubstitutablePathInfo(const Path & path,
+        SubstitutablePathInfo & info) = 0;
     
     /* Copy the contents of a path to the store and register the
        validity the resulting path.  The resulting path is returned.