2 files changed, 27 insertions, 4 deletions
diff --git a/src/libstore/globals.cc b/src/libstore/globals.cc
index 7e97f3c22..d6ea0318e 100644
--- a/src/libstore/globals.cc
+++ b/src/libstore/globals.cc
@@ -31,6 +31,7 @@ Settings::Settings()
     , nixLogDir(canonPath(getEnv("NIX_LOG_DIR").value_or(NIX_LOG_DIR)))
     , nixStateDir(canonPath(getEnv("NIX_STATE_DIR").value_or(NIX_STATE_DIR)))
     , nixConfDir(canonPath(getEnv("NIX_CONF_DIR").value_or(NIX_CONF_DIR)))
+    , nixUserConfFiles(getUserConfigFiles())
     , nixLibexecDir(canonPath(getEnv("NIX_LIBEXEC_DIR").value_or(NIX_LIBEXEC_DIR)))
     , nixBinDir(canonPath(getEnv("NIX_BIN_DIR").value_or(NIX_BIN_DIR)))
     , nixManDir(canonPath(NIX_MAN_DIR))
@@ -77,11 +78,27 @@ void loadConfFile()
        ~/.nix/nix.conf or the command line. */
     globalConfig.resetOverriden();
 
+    auto files = settings.nixUserConfFiles;
+    for (auto file = files.rbegin(); file != files.rend(); file++) {
+        globalConfig.applyConfigFile(*file);
+    }
+}
+
+std::vector<Path> getUserConfigFiles()
+{
+    // Use the paths specified in NIX_USER_CONF_FILES if it has been defined
+    auto nixConfFiles = getEnv("NIX_USER_CONF_FILES");
+    if (nixConfFiles.has_value()) {
+        return tokenizeString<std::vector<string>>(nixConfFiles.value(), ":");
+    }
+
+    // Use the paths specified by the XDG spec
+    std::vector<Path> files;
     auto dirs = getConfigDirs();
-    // Iterate over them in reverse so that the ones appearing first in the path take priority
-    for (auto dir = dirs.rbegin(); dir != dirs.rend(); dir++) {
-        globalConfig.applyConfigFile(*dir + "/nix/nix.conf");
+    for (auto & dir : dirs) {
+        files.insert(files.end(), dir + "/nix/nix.conf");
     }
+    return files;
 }
 
 unsigned int Settings::getDefaultCores()
diff --git a/src/libstore/globals.hh b/src/libstore/globals.hh
index 40f350f0b..da95fd3ae 100644
--- a/src/libstore/globals.hh
+++ b/src/libstore/globals.hh
@@ -53,9 +53,12 @@ public:
     /* The directory where state is stored. */
     Path nixStateDir;
 
-    /* The directory where configuration files are stored. */
+    /* The directory where system configuration files are stored. */
     Path nixConfDir;
 
+    /* A list of user configuration files to load. */
+    std::vector<Path> nixUserConfFiles;
+
     /* The directory where internal helper programs are stored. */
     Path nixLibexecDir;
 
@@ -378,6 +381,9 @@ void initPlugins();
 
 void loadConfFile();
 
+// Used by the Settings constructor
+std::vector<Path> getUserConfigFiles();
+
 extern const string nixVersion;
 
 }