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x/build/cmd/gomote: "--i-will-not-break-the-host" flag breaks argument order #39020

bcmills opened this issue May 12, 2020 · 1 comment


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@bcmills bcmills commented May 12, 2020

gomote ssh currently requires an extra flag, --i-will-not-break-the-host, when connecting to a non-hermetic builder.

Unlike all of the other gomote flags, this one must be positioned ahead of the subcommand instead of behind it. That needlessly breaks scripts that wrap gomote for more ergonomic use (#29037).

Honestly, this flag is pretty obnoxious anyway — I think it should probably be replaced with a warning at login rather than an explicit flag. But if we keep the flag, it should at least be fixed so that it parses in the usual order for subcommand flags.

~/go$ mote ssh --i-will-not-break-the-host
+ SUBCMD=ssh
+ shift
+ '[' -z ssh ']'
+ '[' ssh == create ']'
+ '[' -z '' ']'
+ '[' -e /usr/local/google/home/bcmills/.gomote ']'
+ GOMOTE=user-bcmills-dragonfly-amd64-5_8-0
+ '[' -z user-bcmills-dragonfly-amd64-5_8-0 ']'
+ gomote ssh user-bcmills-dragonfly-amd64-5_8-0 --i-will-not-break-the-host
ssh usage: gomote ssh <instance>
        required for older host configs with reused filesystems; using this says that you are aware that your changes to the machine's root filesystem affect future builds. This is a no-op for the newer, safe host configs.

CC @andybons @bradfitz

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@bradfitz bradfitz commented May 12, 2020

It's hardly the only subcommand with its own FlagSet. Most have their own subcommand-specific flags.

I'd rather you just change gomote to make it more ergonomic rather than everybody carry their own little wrappers.


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