This is why my build systems will only use release tarballs that can be cached. I built HashCache [0][1] to handle caching of these tarballs by their SHA-256,

This is why my build systems will only use release tarballs that can be cached. I built HashCache [0][1] to handle caching of these tarballs by their SHA-256, then the build system can fetch from there first to ensure a local mirror is available. My download process sometimes also caches into my home directory (into ~/.local/cache/by-hash/sha256/...) to avoid hitting the network at all if possible. Also, some tools try to download things from the internet as part of the BUILD process. I also disable that using another tool [2]. Combined this really helps in being able to build my software when upstream goes away. [0] http://hashcache.rkeene.org/ http://hashcache.rkeene.org/ [1] https://chiselapp.com/user/rkeene/repository/hashcache/ https://chiselapp.com/user/rkeene/repository/hashcache/ [2] https://chiselapp.com/user/rkeene/repository/bash-drop-network-access/ https://chiselapp.com/user/rkeene/repository/bash-drop-netwo...