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.
adding a/a
adding a/b
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
copying a/a to b/a
copying a/b to b/b
removing a/a
removing a/b
2 files updated, 0 files merged, 2 files removed, 0 files unresolved
resolving manifests
overwrite None partial False
ancestor f9b20c0d4c51 local ce36d17b18fb+ remote 55119e611c80
a/c: remote renamed directory to b/c -> d
a/b: other deleted -> r
a/a: other deleted -> r
b/a: remote created -> g
b/b: remote created -> g
removing a/a
removing a/b
moving a/c to b/c
getting b/a
getting b/b
3 files updated, 0 files merged, 2 files removed, 0 files unresolved
(branch merge, don't forget to commit)
a/* b/a b/b b/c
M b/a
M b/b
A b/c
a/c
R a/a
R a/b
R a/c
b/c renamed from a/c:354ae8da6e890359ef49ade27b68bbc361f3ca88
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
resolving manifests
overwrite None partial False
ancestor f9b20c0d4c51 local 55119e611c80+ remote ce36d17b18fb
None: local renamed directory to b/c -> d
getting a/c to b/c
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
a/* b/a b/b b/c
A b/c
a/c
b/c renamed from a/c:354ae8da6e890359ef49ade27b68bbc361f3ca88