remotefilelog: import pruned-down remotefilelog extension from hg-experimental This is remotefilelog as of my recent patches for compatibility with current tip of hg, minus support for old versions of Mercurial and some FB-specific features like their treemanifest extension and fetching linkrev data from a patched phabricator. The file extutil.py moved from hgext3rd to remotefilelog. This is not yet ready to be landed, consider it a preview for now. Planned changes include: * replace lz4 with zstd * rename some capabilities, requirements and wireproto commands to mark them as experimental * consolidate bits of shallowutil with related functions (eg readfile) I'm certainly open to other (small) changes, but my rough mission is to land this largely as-is so we can use it as a model of the functionality we need going forward for lazy-fetching of file contents from a server. # no-check-commit because of a few foo_bar functions Differential Revision: https://phab.mercurial-scm.org/D4782

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  $ PYTHONPATH=$TESTDIR/..:$PYTHONPATH

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  $ export PYTHONPATH

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

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  $ hginit master

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  $ cd master

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  $ cat >> .hg/hgrc <<EOF

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  > [remotefilelog]

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  > server=True

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  > serverexpiration=-1

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  > EOF

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  $ echo x > x

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  $ hg commit -qAm x

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  $ echo y > y

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  $ hg commit -qAm y

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  $ echo z > z

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  $ hg commit -qAm z

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  $ cd ..

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  $ hgcloneshallow ssh://user@dummy/master shallow -q

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  3 files fetched over 1 fetches - (3 misses, 0.00% hit ratio) over *s (glob)

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# Compute keepset for 0th and 2nd commit, which implies that we do not process

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# the 1st commit, therefore we diff 2nd manifest with the 0th manifest and

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# populate the keepkeys from the diff

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  $ cd shallow

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  $ cat >> .hg/hgrc <<EOF

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  > [remotefilelog]

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  > pullprefetch=0+2

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  > EOF

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  $ hg debugkeepset

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# Compute keepset for all commits, which implies that we only process deltas of

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# manifests of commits 1 and 2 and therefore populate the keepkeys from deltas

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  $ cat >> .hg/hgrc <<EOF

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  > [remotefilelog]

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  > pullprefetch=all()

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  > EOF

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  $ hg debugkeepset