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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echo "[extensions]" >> $HGRCPATH

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echo "mq=" >> $HGRCPATH

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hg init a

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cd a

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echo a > a

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hg ci -Ama

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hg qnew a.patch

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echo a >> a

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hg qrefresh

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hg qnew b.patch

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echo b > b

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hg add b

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hg qrefresh

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hg qnew c.patch

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echo c > c

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hg add c

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hg qrefresh

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hg qgoto a.patch

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hg qgoto c.patch

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hg qgoto b.patch