Allow offline compilation and --config <PATH>

[michalrus]

Context

Offline compilation

• You reference a JSON file with the ACROPOLIS_OFFLINE_MIRROR environment variable.
• Each key is an URL that the build.rs scripts would normally download.
• Each value is its local path on disk.
• If the variable or keys are not set, it downloads as usual. But people compiling without Internet access, can still do so by providing their own pre-downloaded overrides.

Specifying --config <FILE>

• You can now pass the executables a --config <FILE> argument, and that file will be used.
• If you set ACROPOLIS_OMNIBUS_DEFAULT_CONFIG during compilation, this value will be used as the default, allowing build systems to override the default default of omnibus.toml.
• Same for replayer.toml and ACROPOLIS_REPLAYER_DEFAULT_CONFIG.

❯ acropolis_process_omnibus --help
Usage: acropolis_process_omnibus [OPTIONS]

Options:
      --config <PATH>  [default: /nix/store/3jnims9fplpmbjl4lacq2bny0xqxfdwm-omnibus.toml]
  -h, --help           Print help

❯ acropolis_process_replayer --help
Usage: acropolis_process_replayer [OPTIONS] <--governance-collect|--governance-replay|--alonzo-governance-collect>

Options:
      --config <PATH>              [default: /nix/store/ck6wnix10y6v5n6hr24b1qq18y4lnxjj-replayer.toml]
      --governance-collect
      --governance-replay
      --alonzo-governance-collect
  -h, --help                       Print help

[sandtreader]

Wrong process name?

[michalrus]

Oops, sorry – fixed in 1962198.

[sandtreader]

This is unexpected but most welcome, thanks @michalrus!

Very useful - we can use this for dev configs and prevent ourselves from accidentally committing modified versions, too!

[michalrus]

@sandtreader thanks! I thought that maybe it'd make more sense for the $ACROPOLIS_OFFLINE_MIRROR JSON file to reference file paths, and not their contents as JSON strings? This would be more flexible, also for binary files. I can make that change.

[michalrus]

JSON file to reference file paths, and not their contents as JSON strings?

Done in 976793e.