repo: move unfiltered-repo optimization to workingctx localrepo.__getitem__ special-cased lookup of the working copy parent to avoid looking up obsmarkers. I think the reason for that code (which I once wrote myself) was to make `hg commit` not load obsmarkers, which it would otherwise do via ctx.p1() in localrepo.commitctx(). That had the somewhat unfortunate consequence of making lookup of an unrelated binary nodeid load the dirstate. Now that changectx's constructor is dumb, we can let workingctx._parents() have the opmtimization instead. This affects two tests, because they no longer end up loading the dirstate and their "warning: ignoring unknown working parent ..." messages therefore go way. Differential Revision: https://phab.mercurial-scm.org/D4828

context: move logic from changectx.__init__ to localrepo.__getitem__ (API) My motivation for this change was to make repo[node] not load the dirstate (more about that in the next patch), but I think it makes more sense this way too. For example, raising RepoLookupError seems to belong better in the repo lookup function (i.e. localrepo.__getitem__). This makes the changectx constructor very simple -- it just assigns the given repo, revnum, and nodeid to properties. Differential Revision: https://phab.mercurial-scm.org/D4827

context: reduce dependence of changectx constructor I want to change the constructor's signature and letting all creation of changectx instances go through the repo simplifies that. Differential Revision: https://phab.mercurial-scm.org/D4826

py3: use system strings for HTTP response header comparison res.headers is holding system strings. Attempting to compare against bytes always fails and we fail to print decoded CBOR responses on Python 3. After this change, various test-wireproto* tests are now properly printing CBOR response objects. Differential Revision: https://phab.mercurial-scm.org/D4835

py3: convert HTTP request headers to str The low-level request object ideally takes system strings for HTTP request headers and values. If we send in bytes, it works. But a duplicate header check fails and various tests emit duplicate user-agent headers. Differential Revision: https://phab.mercurial-scm.org/D4834

py3: use system strings in HTTP server code Previously the source transformer was converting some string literals to bytes and we were comparing a system native string to bytes and this was leading to sending the wrong HTTP response headers on Python 3. After this change, we now properly send Transfer-Encoding and Connection response headers on Python 3. Differential Revision: https://phab.mercurial-scm.org/D4833

py3: byteify test-storage.py The test now passed on Python 3. # skip-blame just b'' prefixes Differential Revision: https://phab.mercurial-scm.org/D4836

narrow: remove narrowpatch instead of narrowcopies 84092edd5c88 removed narrowpatch.py and wanted to drop narrowpatch from __init__.py but mistakenly removed narrowcopies. This will make buildbots green again. Differential Revision: https://phab.mercurial-scm.org/D4837