[14.0.0] Add support for :: in --dir to old CLI
#7421
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In Wasmtime 13 and prior the `--dir` argument was unconditionally used to open a host dir as the same name and in the guest. In Wasmtime 14+ though this argument is being repurposed with an optional trailing `::GUEST` to configure the guest directory. This means that `--dir`-with-remapping behavior is actually unusable without the environment variable configuration from bytecodealliance#7385 due to it parsing differently in the old and the new. This commit updates the situation by adding `::`-parsing to the old CLI meaning that both the old and the new parse this the same way. This will break any scripts that open host directories with two colons in their path, but that seems niche enough we can handle that later.
fitzgen
approved these changes
Oct 31, 2023
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This is a backport of #7416 to the 14.0.0 branch