krops: add allocateTTY to writeDeploy

With allocateTTY, nixos-rebuild runs with a terminal, so it shows colours
and progress: on remote targets, ssh gets -t, which allocates a terminal
if its own input is one, and on the local target, expect's unbuffer
provides one.

The nixos-rebuild stand-in records whether its output is a terminal.

1 files changed, 4 insertions, 2 deletions

diff --git a/tests/nixos-rebuild.sh b/tests/nixos-rebuild.sh
index 9e2e47e..ec0c85c 100755
--- a/tests/nixos-rebuild.sh
+++ b/tests/nixos-rebuild.sh
@@ -1,8 +1,10 @@
 #! /bin/sh
-# Stands in for nixos-rebuild: records the user it runs as, NIX_PATH, and its
-# arguments in /tmp/nixos-rebuild.log.
+# Stands in for nixos-rebuild: records the user it runs as, NIX_PATH, its
+# arguments, and whether its output is a terminal in /tmp/nixos-rebuild.log.
+if test -t 1; then terminal=terminal; else terminal='no terminal'; fi
 {
   id -u
   printf '%s\n' "${NIX_PATH-}"
   printf '%s\n' "$*"
+  echo "$terminal"
 } > /tmp/nixos-rebuild.log