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 "patchbomb=" >> $HGRCPATH

hg init
echo a > a
hg commit -Ama -d '1 0'

hg email --date '1970-1-1 0:1' -n -f quux -t foo -c bar tip | \
  sed -e 's/\(Message-Id:.*@\).*/\1/'

echo b > b
hg commit -Amb -d '2 0'

hg email --date '1970-1-1 0:2' -n -f quux -t foo -c bar -s test 0:tip | \
  sed -e 's/\(Message-Id:.*@\).*/\1/' | \
  sed -e 's/\(In-Reply-To:.*@\).*/\1/'

hg email -m test.mbox -f quux -t foo -c bar -s test 0:tip