Excerpts from Ryan McElroy's message of 2017-03-28 09:47:18 +0100:
> On 3/27/17 7:02 AM, Jun Wu wrote:
> > # HG changeset patch
> > # User Jun Wu <qu...@fb.com>
> > # Date 1490589217 25200
> > # Sun Mar 26 21:33:37 2017 -0700
> > # Node ID 38572bb2cffd815526a727bc6f3aacdca2902f4f
> > # Parent 9b0aa30bf151b6c0e999b017fd328e29440bd447
> > rcutil: let environ override system configs (BC)
>
> Small nits inline. Could easily be addressed by a follow-up.
>
> >
> > This is BC because system configs won't be able to override $EDITOR, $PAGER.
> > The new behavior is arguably more rational.
> >
> > diff --git a/mercurial/commands.py b/mercurial/commands.py
> > --- a/mercurial/commands.py
> > +++ b/mercurial/commands.py
> > @@ -1807,4 +1807,6 @@ def config(ui, repo, *values, **opts):
> > if t == 'path':
> > ui.debug('read config from: %s\n' % f)
> > + elif t == 'items':
> > + pass
> > else:
> > raise error.ProgrammingError('unknown rctype: %s' % t)
> > diff --git a/mercurial/rcutil.py b/mercurial/rcutil.py
> > --- a/mercurial/rcutil.py
> > +++ b/mercurial/rcutil.py
> > @@ -77,8 +77,12 @@ def rccomponents():
> > name, value, source) that should fill the config directly.
> > '''
> > + envrc = ('items', envrcitems())
> > +
> > global _rccomponents
> > if _rccomponents is None:
> > if 'HGRCPATH' in encoding.environ:
> > - _rccomponents = []
> > + # assume HGRCPATH is all about user configs so environments
> > can be
> > + # overridden.
> > + _rccomponents = [envrc]
> > for p in
> > encoding.environ['HGRCPATH'].split(pycompat.ospathsep):
> > if not p:
> > @@ -86,5 +90,8 @@ def rccomponents():
> > _rccomponents.extend(('path', p) for p in
> > _expandrcpath(p))
> > else:
> > - paths = defaultrcpath() + systemrcpath() + userrcpath()
> > + paths = defaultrcpath() + systemrcpath()
> > _rccomponents = [('path', os.path.normpath(p)) for p in paths]
> > + _rccomponents.append(envrc)
> > + paths = userrcpath()
> > + _rccomponents.extend(('path', os.path.normpath(p)) for p in
> > paths)
>
> This line is essentially repeated from above... I think it could be
> factored out in a future clean-up.
I didn't do that because that makes the code at least 2 lines longer.
>
> > return _rccomponents
> > diff --git a/mercurial/ui.py b/mercurial/ui.py
> > --- a/mercurial/ui.py
> > +++ b/mercurial/ui.py
> > @@ -212,8 +212,18 @@ class ui(object):
> > """Create a ui and load global and user configs"""
> > u = cls()
> > - # we always trust global config files
> > + # we always trust global config files and environment variables
> > for t, f in rcutil.rccomponents():
> > if t == 'path':
> > u.readconfig(f, trust=True)
> > + elif t == 'items':
> > + sections = set()
> > + for section, name, value, source in f:
> > + # do not set u._ocfg
>
> This comment doesn't explain why, so it's not very helpful.
It will disappear with immutable config.
>
> > + # XXX clean this up once immutable config object is a
> > thing
> > + u._tcfg.set(section, name, value, source)
> > + u._ucfg.set(section, name, value, source)
> > + sections.add(section)
> > + for section in sections:
> > + u.fixconfig(section=section)
> > else:
> > raise error.ProgrammingError('unknown rctype: %s' % t)
> > diff --git a/tests/test-config-env.py b/tests/test-config-env.py
> > new file mode 100644
> > --- /dev/null
> > +++ b/tests/test-config-env.py
> > @@ -0,0 +1,48 @@
> > +# Test the config layer generated by environment variables
> > +
> > +from __future__ import absolute_import, print_function
> > +
> > +import os
> > +
> > +from mercurial import (
> > + encoding,
> > + rcutil,
> > + ui as uimod,
> > +)
> > +
> > +testtmp = encoding.environ['TESTTMP']
> > +
> > +# prepare hgrc files
> > +def join(name):
> > + return os.path.join(testtmp, name)
> > +
> > +with open(join('sysrc'), 'w') as f:
> > + f.write('[ui]\neditor=e0\n[pager]\npager=p0\n')
> > +
> > +with open(join('userrc'), 'w') as f:
> > + f.write('[ui]\neditor=e1')
> > +
> > +# replace rcpath functions so they point to the files above
> > +def systemrcpath():
> > + return [join('sysrc')]
> > +
> > +def userrcpath():
> > + return [join('userrc')]
> > +
> > +rcutil.systemrcpath = systemrcpath
> > +rcutil.userrcpath = userrcpath
> > +os.path.isdir = lambda x: False # hack: do not load default.d/*.rc
> > +
> > +# utility to print configs
> > +def printconfigs(env):
> > + encoding.environ = env
> > + rcutil._rccomponents = None # reset cache
> > + ui = uimod.ui.load()
> > + for section, name, value in ui.walkconfig():
> > + source = ui.configsource(section, name)
> > + print('%s.%s=%s # %s' % (section, name, value, source))
> > + print('')
> > +
> > +# environment variable overrides
> > +printconfigs({})
> > +printconfigs({'EDITOR': 'e2', 'PAGER': 'p2'})
> > diff --git a/tests/test-config-env.py.out b/tests/test-config-env.py.out
> > new file mode 100644
> > --- /dev/null
> > +++ b/tests/test-config-env.py.out
> > @@ -0,0 +1,6 @@
> > +pager.pager=p0 # $TESTTMP/sysrc:4
> > +ui.editor=e1 # $TESTTMP/userrc:2
> > +
> > +pager.pager=p2 # $PAGER
> > +ui.editor=e1 # $TESTTMP/userrc:2
> > +
> > diff --git a/tests/test-config.t b/tests/test-config.t
> > --- a/tests/test-config.t
> > +++ b/tests/test-config.t
> > @@ -165,2 +165,16 @@ edit failure
> > abort: edit failed: false exited with status 1
> > [255]
> > +
> > +config affected by environment variables
> > +
> > + $ EDITOR=e1 VISUAL=e2 hg config --debug | grep 'ui\.editor'
> > + $VISUAL: ui.editor=e2
> > +
> > + $ VISUAL=e2 hg config --debug --config ui.editor=e3 | grep 'ui\.editor'
> > + --config: ui.editor=e3
> > +
> > + $ PAGER=p1 hg config --debug | grep 'pager\.pager'
> > + $PAGER: pager.pager=p1
> > +
> > + $ PAGER=p1 hg config --debug --config pager.pager=p2 | grep
> > 'pager\.pager'
> > + --config: pager.pager=p2
> >
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