view tests/test-trusted.py.out @ 33289:abd7dedbaa36

sparse: vendor Facebook-developed extension

Facebook has developed an extension to enable "sparse" checkouts -
a working directory with a subset of files. This feature is a critical
component in enabling repositories to scale to infinite number of
files while retaining reasonable performance. It's worth noting
that sparse checkout is only one possible solution to this problem:
another is virtual filesystems that realize files on first access.
But given that virtual filesystems may not be accessible to all
users, sparse checkout is necessary as a fallback.

Per mailing list discussion at
https://www.mercurial-scm.org/pipermail/mercurial-devel/2017-March/095868.html
we want to add sparse checkout to the Mercurial distribution via
roughly the following mechanism:

1. Vendor extension as-is with minimal modifications (this patch)
2. Refactor extension so it is more clearly experimental and inline
   with Mercurial practices
3. Move code from extension into core where possible
4. Drop experimental labeling and/or move feature into core
   after sign-off from narrow clone feature owners

This commit essentially copies the sparse extension and tests
from revision 71e0a2aeca92a4078fe1b8c76e32c88ff1929737 of the
https://bitbucket.org/facebook/hg-experimental repository.

A list of modifications made as part of vendoring is as follows:

* "EXPERIMENTAL" added to module docstring
* Imports were changed to match Mercurial style conventions
* "testedwith" value was updated to core Mercurial special value and
  comment boilerplate was inserted
* A "clone_sparse" function was renamed to "clonesparse" to appease
  the style checker
* Paths to the sparse extension in tests reflect built-in location
* test-sparse-extensions.t was renamed to test-sparse-fsmonitor.t
  and references to "simplecache" were removed. The test always skips
  because it isn't trivial to run it given the way we currently run
  fsmonitor tests
* A double empty line was removed from test-sparse-profiles.t

There are aspects of the added code that are obviously not ideal.
The goal is to make a minimal number of modifications as part of
the vendoring to make it easier to track changes from the original
implementation. Refactoring will occur in subsequent patches.

# same user, same group
trusted
    global = /some/path
    local = /another/path
untrusted
. . global = /some/path
. . local = /another/path

# same user, different group
trusted
    global = /some/path
    local = /another/path
untrusted
. . global = /some/path
. . local = /another/path

# different user, same group
not trusting file .hg/hgrc from untrusted user abc, group bar
trusted
    global = /some/path
untrusted
. . global = /some/path
. . local = /another/path

# different user, same group, but we trust the group
trusted
    global = /some/path
    local = /another/path
untrusted
. . global = /some/path
. . local = /another/path

# different user, different group
not trusting file .hg/hgrc from untrusted user abc, group def
trusted
    global = /some/path
untrusted
. . global = /some/path
. . local = /another/path

# different user, different group, but we trust the user
trusted
    global = /some/path
    local = /another/path
untrusted
. . global = /some/path
. . local = /another/path

# different user, different group, but we trust the group
trusted
    global = /some/path
    local = /another/path
untrusted
. . global = /some/path
. . local = /another/path

# different user, different group, but we trust the user and the group
trusted
    global = /some/path
    local = /another/path
untrusted
. . global = /some/path
. . local = /another/path

# we trust all users
# different user, different group
trusted
    global = /some/path
    local = /another/path
untrusted
. . global = /some/path
. . local = /another/path

# we trust all groups
# different user, different group
trusted
    global = /some/path
    local = /another/path
untrusted
. . global = /some/path
. . local = /another/path

# we trust all users and groups
# different user, different group
trusted
    global = /some/path
    local = /another/path
untrusted
. . global = /some/path
. . local = /another/path

# we don't get confused by users and groups with the same name
# different user, different group
not trusting file .hg/hgrc from untrusted user abc, group def
trusted
    global = /some/path
untrusted
. . global = /some/path
. . local = /another/path

# list of user names
# different user, different group, but we trust the user
trusted
    global = /some/path
    local = /another/path
untrusted
. . global = /some/path
. . local = /another/path

# list of group names
# different user, different group, but we trust the group
trusted
    global = /some/path
    local = /another/path
untrusted
. . global = /some/path
. . local = /another/path

# Can't figure out the name of the user running this process
# different user, different group
not trusting file .hg/hgrc from untrusted user abc, group def
trusted
    global = /some/path
untrusted
. . global = /some/path
. . local = /another/path

# prints debug warnings
# different user, different group
not trusting file .hg/hgrc from untrusted user abc, group def
trusted
ignoring untrusted configuration option paths.local = /another/path
    global = /some/path
untrusted
. . global = /some/path
. ignoring untrusted configuration option paths.local = /another/path
. local = /another/path

# report_untrusted enabled without debug hides warnings
# different user, different group
trusted
    global = /some/path
untrusted
. . global = /some/path
. . local = /another/path

# report_untrusted enabled with debug shows warnings
# different user, different group
not trusting file .hg/hgrc from untrusted user abc, group def
trusted
ignoring untrusted configuration option paths.local = /another/path
    global = /some/path
untrusted
. . global = /some/path
. ignoring untrusted configuration option paths.local = /another/path
. local = /another/path

# ui.readconfig sections
quux

# read trusted, untrusted, new ui, trusted
not trusting file foobar from untrusted user abc, group def
trusted:
ignoring untrusted configuration option foobar.baz = quux
None
untrusted:
quux

# error handling
# file doesn't exist
# same user, same group
# different user, different group

# parse error
# different user, different group
not trusting file .hg/hgrc from untrusted user abc, group def
('foo', '.hg/hgrc:1')
# same user, same group
('foo', '.hg/hgrc:1')

# access typed information
# different user, different group
not trusting file .hg/hgrc from untrusted user abc, group def
# suboptions, trusted and untrusted
(None, []) ('main', [('one', 'one'), ('two', 'two')])
# path, trusted and untrusted
None .hg/monty/python
# bool, trusted and untrusted
False True
# int, trusted and untrusted
0 42
# bytes, trusted and untrusted
0 84934656
# list, trusted and untrusted
[] ['spam', 'ham', 'eggs']