narrow: import experimental extension from narrowhg revision cb51d673e9c5 Adjustments: * renamed src to hgext/narrow * marked extension experimental * added correct copyright header where it was missing * updated hgrc extension enable line in library.sh * renamed library.sh to narrow-library.sh * dropped all files from repo root as they're not interesting * dropped test-pyflakes.t, test-check-code.t and test-check-py3-compat.t * renamed remaining tests to all be test-narrow-* when they didn't already * fixed test-narrow-expanddirstate.t to refer to narrow and not narrowhg * fixed tests that wanted `update -C .` instead of `merge --abort` * corrected a two-space indent in narrowspec.py * added a missing _() in narrowcommands.py * fixed imports to pass the import checker * narrow only adds its --include and --exclude to clone if sparse isn't enabled to avoid breaking test-duplicateoptions.py. This is a kludge, and we'll need to come up with a better solution in the future. These were more or less the minimum to import something that would pass tests and not create a bunch of files we'll never use. Changes I intend to make as followups: * rework the test-narrow-*-tree.t tests to use the new testcases functionality in run-tests.py * remove lots of monkeypatches of core things Differential Revision: https://phab.mercurial-scm.org/D1974

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  $ . "$TESTDIR/narrow-library.sh"

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  $ hg init master

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  $ cd master

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  $ echo treemanifest >> .hg/requires

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  $ echo 'contents of file' > file

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  $ mkdir foo

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  $ echo 'contents of foo/bar' > foo/bar

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  $ hg ci -Am 'some change'

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  adding file

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  adding foo/bar

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  $ cd ..

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  $ hg clone --narrow ssh://user@dummy/master copy --include=foo

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  requesting all changes

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  adding changesets

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  adding manifests

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  adding file changes

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  added 1 changesets with 1 changes to 1 files

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  new changesets * (glob)

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  updating to branch default

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  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

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  $ cd copy

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  $ hg debugdirstate

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  n *         20 unset               foo/bar (glob)

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  $ mv .hg/dirstate .hg/old_dirstate

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  $ dd bs=40 count=1 if=.hg/old_dirstate of=.hg/dirstate 2>/dev/null

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  $ hg debugdirstate

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  $ hg debugrebuilddirstate

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  $ hg debugdirstate

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  n *         * unset               foo/bar (glob)