kops: Don't try to split --set flags on commas

[justinsb]

Passing quotes in very difficult with the --set flag, because the
pflag library tries to parse it using strict CSV semantics. We switch
to using the StringArrayVar, which does not attempt splitting.

This is a breaking change; compound flags must now be written as two flags, but I think that is clearer.

Example: --set=a,b must now be --set=a --set=b

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[hakman]

This would break some scenarios, like scalability tests.
/hold

[justinsb]

This would break some scenarios, like scalability tests.

Ah, bummer. I do think --set=foo=bar --set=foo2=bar2 is more readable than --set=foo=bar,foo2=bar2, particularly when the paths get long, but it is a breaking change.

We could also just do a more naive splitting on commas. We can also use the CSV splitter with LazyQuotes=true, this was proposed in spf13/pflag#371

[hakman]

I think just fixing the scalability scenario would be enough. It's not such a bad change.
There may be other problems with the way we de-duplicate args in kubetest (I guess it's why I did this ugly thing).

kops/tests/e2e/scenarios/scalability/run-test.sh

Line 89 in b4d787f

create_args=("--network-cidr=10.0.0.0/16,10.1.0.0/16,10.2.0.0/16,10.3.0.0/16,10.4.0.0/16,10.5.0.0/16,10.6.0.0/16,10.7.0.0/16,10.8.0.0/16,10.9.0.0/16,10.10.0.0/16,10.11.0.0/16,10.12.0.0/16")

[justinsb]

I do think you raise a good point though, and it's possible that people are setting compound flags "in the wild" that we don't know about, so I don't particularly want to break them if we can avoid it.

The fix is actually pretty easy, in #16128 - we just need to set LazyQuotes: true. It's a bit harder than it should be, but it would be very easy if pflag merged the support.

My 2c: #16128 unblocks us without breaking anyone...

[hakman]

#16128 was merged.
/close

[k8s-ci-robot]

@hakman: Closed this PR.

In response to this:

#16128 was merged.
/close

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[k8s-ci-robot]

PR needs rebase.

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