Fix rollback to old profiles

In 5d5da48 (https://github.com/serokell/deploy-rs/pull/81), $DRY_ACTIVATE
is used in a bash script with -u. When DRY_ACTIVATE is not set (which it
is not for older profiles), the script fails. Fix this by setting a fallback.

1 files changed, 1 insertions, 1 deletions

diff --git a/flake.nix b/flake.nix
index bc1ebc6..c6b3357 100644
--- a/flake.nix
+++ b/flake.nix
@@ -73,7 +73,7 @@
                             #!${pkgs.runtimeShell}
                             set -euo pipefail
 
-                            if [[ $DRY_ACTIVATE == "1" ]]
+                            if [[ "x''${DRY_ACTIVATE:-}" == "x1" ]]
                             then
                                 ${if builtins.hasAttr "dryActivate" customSelf
                                   then