opam
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ocaml
opam admin should self-upgrade (as other commands do)
opam admin --help shows OPAMNOSELFUPGRADE in ENVIRONMENT VARIABLES but doesn't actually support it, or the --no-self-upgrade.
For consistency, global options should probably be available globally 🙂 It should just be a matter of moving the wrapping in OpamCommands.global_options into OpamArg.global_options.
Having looked at this in more detail, this would entail a bigger change of behaviour. At the moment, all commands except opam admin do self-upgrading (and so have --no-self-upgrade). It obviously makes no sense to add --no-self-upgrade to opam admin without also making it do the self-upgrade. However, that's a less-obvious change, so I'm going to bump this to next.
The change itself is not difficult, though - and it can also be guarded with CLI versioning!