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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#!/bin/sh

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hg init

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echo a > a

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hg commit -A -ma

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echo a >> a

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hg commit -mb

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echo a >> a

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hg commit -mc

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hg up 1

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echo a >> a

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hg commit -md

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hg up 1

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echo a >> a

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hg commit -me

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hg up 1

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echo % should fail because not at a head

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hg merge

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hg up

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echo % should fail because \> 2 heads

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hg merge

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echo % should succeed

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hg merge 2

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hg commit -mm1

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echo % should succeed - 2 heads

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hg merge

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hg commit -mm2

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echo % should fail because at tip

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hg merge

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hg up 0

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echo % should fail because 1 head

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hg merge

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true