tests: guix-time-machine: explicitly configure zero trusted channels.

(current-channels) is empty in a regular guix checkout, but 'guix build guix'
passes --with-channel-commit=..., which causes it to return the configured
guix channel.  Consequently (trusted-channels) isn't empty and these tests
fail in 'guix build guix'.

* tests/guix-time-machine.sh: explicitly create an empty trusted-channels.scm.

Change-Id: I4584ee96f49edbad414cae611126679e9000e555
Signed-off-by: Ludovic Courtès <ludo@gnu.org>

1 files changed, 8 insertions, 4 deletions

diff --git a/tests/guix-time-machine.sh b/tests/guix-time-machine.sh
index e61232f94fa..6a273fd3935 100644
--- a/tests/guix-time-machine.sh
+++ b/tests/guix-time-machine.sh
@@ -74,11 +74,16 @@ cat > "$channels_file" <<EOF
 EOF
 guix repl -- "$channels_file"
 
-# Under 'pre-inst-env', there are zero trusted channels by default.
 cat > "$channels_file" <<EOF
 %default-channels
 EOF
 
+# Ensure there are zero trusted channels
+mkdir -p "$XDG_CACHE_HOME/dot-config/guix"
+cat > "$XDG_CACHE_HOME/dot-config/guix/trusted-channels.scm" <<EOF
+(list)
+EOF
+
 # Ignore the user's ~/.config/guix/trusted-channels.scm and ensure this
 # command fails.
 XDG_CONFIG_HOME="$XDG_CACHE_HOME/dot-config" \
@@ -87,9 +92,8 @@ grep "'guix' is not trusted" "$log_file"
 
 if guile -c '(getaddrinfo "www.gnu.org" "80" AI_NUMERICSERV)' 2> /dev/null
 then
-    # Ignore the user's ~/.config/guix/trusted-channels.scm.  Under
-    # ./pre-inst-env zero channels are trusted by default so the following
-    # command must fail.
+    # Ignore the user's ~/.config/guix/trusted-channels.scm.  We've ensured
+    # there are no trusted channels so the following command must fail.
     XDG_CONFIG_HOME="$XDG_CACHE_HOME/dot-config"                \
     guix time-machine                                           \
          -C swh:1:cnt:003e1e0c1b9b358082201332c926ae54e9549002  \