Hi, Commit 2207f73 changes the substituter to provide feedback when hydra.gnu.org is unresponsive, which happens from time to time (the Nix folks did a similar trick recently.)
If an HTTP GET hasn’t completed after 3 seconds, it prints a message saying that the server is unresponsive and hinting at --no-substitutes. This is better than having ‘guix build’ or ‘guix package’ sit here without saying a word of what’s going on. Comments and tests welcome, esp. from Guile 2.0.5 users! Ludo’.
