* A GC setting `gc-keep-outputs' to specify whether output paths of

  derivations should be kept.

1 files changed, 50 insertions, 0 deletions

diff --git a/src/libstore/globals.cc b/src/libstore/globals.cc
index 52f2a0a0bffa..22820f2fe8ac 100644
--- a/src/libstore/globals.cc
+++ b/src/libstore/globals.cc
@@ -1,10 +1,14 @@
 #include "globals.hh"
 
+#include <map>
+
+
 string nixStore = "/UNINIT";
 string nixDataDir = "/UNINIT";
 string nixLogDir = "/UNINIT";
 string nixStateDir = "/UNINIT";
 string nixDBPath = "/UNINIT";
+string nixConfDir = "/UNINIT";
 
 bool keepFailed = false;
 
@@ -17,3 +21,49 @@ Verbosity buildVerbosity = lvlInfo;
 unsigned int maxBuildJobs = 1;
 
 bool readOnlyMode = false;
+
+
+static bool settingsRead = false;
+
+static map<string, string> settings;
+
+
+static void readSettings()
+{
+    Path settingsFile = (format("%1%/%2%") % nixConfDir % "nix.conf").str();
+    if (!pathExists(settingsFile)) return;
+    string contents = readFile(settingsFile);
+
+    unsigned int pos = 0;
+
+    while (pos < contents.size()) {
+        string line;
+        while (pos < contents.size() && contents[pos] != '\n')
+            line += contents[pos++];
+        pos++;
+
+        unsigned int hash = line.find('#');
+        if (hash != string::npos)
+            line = string(line, 0, hash);
+
+        if (line.find_first_not_of(" ") == string::npos) continue;
+
+        istringstream is(line);
+        string name, sep, value;
+        is >> name >> sep >> value;
+        if (sep != "=" || !is)
+            throw Error(format("illegal configuration line `%1%'") % line);
+        
+        settings[name] = value;
+    };
+    
+    settingsRead = true;
+}
+
+
+string querySetting(const string & name, const string & def)
+{
+    if (!settingsRead) readSettings();
+    map<string, string>::iterator i = settings.find(name);
+    return i == settings.end() ? def : i->second;
+}