nix-env: Create ~/.nix-defexpr automatically

(cherry picked from commit c9159f86cc9a2fc07e2ab1217c2d8a8824123df4)

1 files changed, 12 insertions, 7 deletions

diff --git a/src/nix-env/nix-env.cc b/src/nix-env/nix-env.cc
index c7b6bdaafbc2..ec7ed504b8ed 100644
--- a/src/nix-env/nix-env.cc
+++ b/src/nix-env/nix-env.cc
@@ -193,12 +193,6 @@ static void loadDerivations(EvalState & state, Path nixExprPath,
 }
 
 
-static Path getDefNixExprPath()
-{
-    return getHome() + "/.nix-defexpr";
-}
-
-
 static long getPriority(EvalState & state, DrvInfo & drv)
 {
     return drv.queryMetaInt("priority", 0);
@@ -1330,9 +1324,20 @@ static int _main(int argc, char * * argv)
         Globals globals;
 
         globals.instSource.type = srcUnknown;
-        globals.instSource.nixExprPath = getDefNixExprPath();
+        globals.instSource.nixExprPath = getHome() + "/.nix-defexpr";
         globals.instSource.systemFilter = "*";
 
+        if (!pathExists(globals.instSource.nixExprPath)) {
+            createDirs(globals.instSource.nixExprPath);
+            replaceSymlink(
+                fmt("%s/profiles/per-user/%s/channels", settings.nixStateDir, getUserName()),
+                globals.instSource.nixExprPath + "/channels");
+            if (getuid() != 0)
+                replaceSymlink(
+                    fmt("%s/profiles/per-user/root/channels", settings.nixStateDir),
+                    globals.instSource.nixExprPath + "/channels_root");
+        }
+
         globals.dryRun = false;
         globals.preserveInstalled = false;
         globals.removeAll = false;