nix cat/dump-path/key: stop progress bar before writeFull

These commands outputs data that may not end with a newline. This
causes problems when the progress bar redraws, as that completely
wipes the last line of output. As nix key generate-secret outputs
a single line of text with no output, it shows up entirely blank,
making it look like nothing happened.

Fixes: https://git.lix.systems/lix-project/lix/issues/320
Change-Id: I5ac706d71d839b6dfa760b60a351414cd96297cf

1 files changed, 3 insertions, 0 deletions

diff --git a/src/nix/sigs.cc b/src/nix/sigs.cc
index 730aa6532..eeb14e29a 100644
--- a/src/nix/sigs.cc
+++ b/src/nix/sigs.cc
@@ -3,6 +3,7 @@
 #include "store-api.hh"
 #include "thread-pool.hh"
 #include "signals.hh"
+#include "progress-bar.hh"
 
 #include <atomic>
 
@@ -220,6 +221,8 @@ struct CmdKey : NixMultiCommand
     {
         if (!command)
             throw UsageError("'nix key' requires a sub-command.");
+
+        stopProgressBar();
         command->second->run();
     }
 };