From 884646593488bfacd851bec72b7ac1a4841bf458 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <e.dolstra@tudelft.nl>
Date: Tue, 29 Jul 2003 14:28:17 +0000
Subject: * Get garbage collection and cache population to work *properly*.  
 Renamed `fstateRefs' to `fstateRequisites'.  The semantics of this   function
 is that it returns a list of all paths necessary to realise   a given
 expression.  For a derive expression, this is the union of   requisites of
 the inputs; for a slice expression, it is the path of   each element in the
 slice.  Also included are the paths of the   expressions themselves. 
 Optionally, one can also include the   requisites of successor expressions
 (to recycle intermediate   results).

* `nix-switch' now distinguishes between an expression and its normal
  form.  Usually, only the normal form is registered as a root of the
  garbage collector.  With the `--source-root' flag, it will also
  register the original expression as a root.

* `nix-collect-garbage' now has a flag `--keep-successors' which
  causes successors not to be included in the list of garbage paths.

* `nix-collect-garbage' now has a flag `--invert' which will print all
  paths that should *not* be garbage collected.
---
 src/nix.cc | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

(limited to 'src/nix.cc')

diff --git a/src/nix.cc b/src/nix.cc
index a7bcf7268..68d01f2f8 100644
--- a/src/nix.cc
+++ b/src/nix.cc
@@ -95,18 +95,22 @@ FSId maybeNormalise(const FSId & id, bool normalise)
 /* Perform various sorts of queries. */
 static void opQuery(Strings opFlags, Strings opArgs)
 {
-    enum { qList, qRefs, qGenerators, qExpansion, qGraph 
+    enum { qList, qRequisites, qGenerators, qExpansion, qGraph 
     } query = qList;
     bool normalise = false;
+    bool includeExprs = true;
+    bool includeSuccessors = false;
 
     for (Strings::iterator i = opFlags.begin();
          i != opFlags.end(); i++)
         if (*i == "--list" || *i == "-l") query = qList;
-        else if (*i == "--refs" || *i == "-r") query = qRefs;
+        else if (*i == "--requisites" || *i == "-r") query = qRequisites;
         else if (*i == "--generators" || *i == "-g") query = qGenerators;
         else if (*i == "--expansion" || *i == "-e") query = qExpansion;
         else if (*i == "--graph") query = qGraph;
         else if (*i == "--normalise" || *i == "-n") normalise = true;
+        else if (*i == "--exclude-exprs") includeExprs = false;
+        else if (*i == "--include-successors") includeSuccessors = true;
         else throw UsageError(format("unknown flag `%1%'") % *i);
 
     switch (query) {
@@ -126,13 +130,14 @@ static void opQuery(Strings opFlags, Strings opArgs)
             break;
         }
 
-        case qRefs: {
+        case qRequisites: {
             StringSet paths;
             for (Strings::iterator i = opArgs.begin();
                  i != opArgs.end(); i++)
             {
-                Strings paths2 = fstateRefs(
-                    maybeNormalise(argToId(*i), normalise));
+                Strings paths2 = fstateRequisites(
+                    maybeNormalise(argToId(*i), normalise),
+                    includeExprs, includeSuccessors);
                 paths.insert(paths2.begin(), paths2.end());
             }
             for (StringSet::iterator i = paths.begin(); 
-- 
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