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.

#!/bin/sh

echo "[extensions]" >> $HGRCPATH
echo "convert=" >> $HGRCPATH

hg init a
cd a
echo a > a
hg ci -d'0 0' -Ama
hg cp a b
hg ci -d'1 0' -mb
hg rm a
hg ci -d'2 0' -mc
hg mv b a
hg ci -d'3 0' -md
echo a >> a
hg ci -d'4 0' -me

cd ..
hg convert a 2>&1 | grep -v 'subversion python bindings could not be loaded'
hg --cwd a-hg pull ../a