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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Make a narrow clone then archive it

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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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  $ for x in `$TESTDIR/seq.py 3`; do

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  >   echo $x > "f$x"

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  >   hg add "f$x"

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  >   hg commit -m "Add $x"

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  > done

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  $ cat >> .hg/hgrc << EOF

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  > [narrowhgacl]

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  > default.includes=f1 f2

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  > EOF

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  $ hg serve -a localhost -p $HGPORT1 -d --pid-file=hg.pid

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  $ cat hg.pid >> "$DAEMON_PIDS"

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  $ cd ..

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  $ hg clone http://localhost:$HGPORT1 narrowclone1

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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 3 changesets with 2 changes to 2 files

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  new changesets * (glob)

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  updating to branch default

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  2 files updated, 0 files merged, 0 files removed, 0 files unresolved

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The clone directory should only contain f1 and f2

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  $ ls -1 narrowclone1 | sort

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  f1

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  f2

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Requirements should contain narrowhg

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  $ cat narrowclone1/.hg/requires | grep narrowhg

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  narrowhg

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NarrowHG should track f1 and f2

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  $ hg -R narrowclone1 tracked

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  I path:f1

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  I path:f2