nix-env --upgrade: show "downgrading" when doing so

It was strange to show "upgrading" when the version was getting lower.
This is left on "upgrading" when the versions are the same,
as I can't see any better wording.

1 files changed, 4 insertions, 2 deletions

diff --git a/src/nix-env/nix-env.cc b/src/nix-env/nix-env.cc
index ddbba24843..400b148e9c 100644
--- a/src/nix-env/nix-env.cc
+++ b/src/nix-env/nix-env.cc
@@ -602,9 +602,11 @@ static void upgradeDerivations(Globals & globals,
                     i.queryOutPath() !=
                     bestElem->queryOutPath())
                 {
+                    const char * action = compareVersions(drvName.version, bestVersion) <= 0
+                        ? "upgrading" : "downgrading";
                     printMsg(lvlInfo,
-                        format("upgrading ‘%1%’ to ‘%2%’")
-                        % i.name % bestElem->name);
+                        format("%1% ‘%2%’ to ‘%3%’")
+                        % action % i.name % bestElem->name);
                     newElems.push_back(*bestElem);
                 } else newElems.push_back(i);