Don't try to determine interactivity if ui() called with interactive=False. WSGI applications are not supposed to refer to sys.stdin. In ed6df6b1c29a, hgweb and hgwebdir were fixed to pass interactive=False to their ui()'s, but sys.stdin.isatty() was still called by the ui objects. This change makes sure only the ui.fixconfig() method will call ui.isatty() (by making the ui._readline() method, which is currently only called from ui.prompt(), private). ui.fixconfig() is changed to let config files override the initial interactivity setting, but not check isatty() if interactive=False was specified in the creation of the ui.

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adding bar

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adding foo

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% state dump

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a   0         -1 baz

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n 644          0 foo

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r   0          0 bar

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% status

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A baz

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R bar

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C foo

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% state dump

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n 666         -1 bar

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n 666         -1 foo

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% status

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! bar

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? baz

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C foo