config: use all of XDG_CONFIG_DIRS

Previously, config would only be read from XDG_CONFIG_HOME. This change
allows reading config from additional directories, which enables e.g.
per-project binary caches or chroot stores with the help of direnv.

1 files changed, 9 insertions, 0 deletions

diff --git a/src/libutil/util.cc b/src/libutil/util.cc
index 03f0be705c..259eaf0a0d 100644
--- a/src/libutil/util.cc
+++ b/src/libutil/util.cc
@@ -496,6 +496,15 @@ Path getConfigDir()
     return configDir;
 }
 
+std::vector<Path> getConfigDirs()
+{
+    Path configHome = getConfigDir();
+    string configDirs = getEnv("XDG_CONFIG_DIRS");
+    std::vector<Path> result = tokenizeString<std::vector<string>>(configDirs, ":");
+    result.insert(result.begin(), configHome);
+    return result;
+}
+
 
 Path getDataDir()
 {