py3: byteify the LFS blobstore module This is almost entirely b'' prefixing, with a couple of exceptions forced to bytes. Much of this is also borrowed from Augie's code. There's an HTTPError.read() that I flagged that I assume needs to be converted to bytes, but I can't find confirmation. Handling the deserialized JSON object over several functions made r'' vs b'' accesses confusing, so this assumes that the JSON object will be converted to bytes immediately. That will be done in the following commits, so it's not buried in these trivial changes.

py3: raw stringify various things in the LFS server module Some of this is based on code written by Augie. I'm slightly unsure if these are the correct pycompat bytes <-> str conversion methods.

py3: add b'' prefixes to the LFS server module There are a ton of these changes in the blobstore, as well as r'' prefixing. So separating these out hopefully makes review easier. # skip-blame for b'' prefixing

py3: add b'' and r'' prefixes to LFS tests

py3: more tests from the ratchet Differential Revision: https://phab.mercurial-scm.org/D5730

dispatch: unify handler of IOError and OSError These exceptions were merged in Python 3.

dispatch: quote filename in IOError as well It's explicitly added for OSError at 720308f741cb "dispatch: show empty filename in OSError aborts". Let's do the same for IOError.

dispatch: add inline comment about possible IOError subtypes It's hard to tell which "if" would handle which exception.

convert: print exception message directly Otherwise the default repr() implementation will b'' prefix the returned str on Python 3. Differential Revision: https://phab.mercurial-scm.org/D5729

crecord: always return a str from uihunk.__repr__ Otherwise Python 3 complains about it returning bytes. Differential Revision: https://phab.mercurial-scm.org/D5728

tests: handles bytes/str mismatch in test-commit-interface-curses.t This fixes various test failures on Python 3. Differential Revision: https://phab.mercurial-scm.org/D5727

githelp: format with %d if an integer Python 3 doesn't allow us to format an int with %s like Python 2 did. So handle that. Differential Revision: https://phab.mercurial-scm.org/D5726

githelp: make argument parsing more compatible with Python 3 There were various mixing of str and bytes in here. This change fixes most of the failures in test-githelp.t. Differential Revision: https://phab.mercurial-scm.org/D5725

tests: add b'' prefixes to flagprocessorext.py Otherwise a part of test-flavprocessor.t fails due to not setting the proper key. Differential Revision: https://phab.mercurial-scm.org/D5724

tests: add b'' to config file name Without this, things die in the bowels of the config system due to mixing str and bytes. # skip-blame: just b'' prefix Differential Revision: https://phab.mercurial-scm.org/D5723

sslutil: ensure serverhostname is bytes when formatting It will likely be a str on Python 3. Differential Revision: https://phab.mercurial-scm.org/D5722

sslutil: use raw strings for exception reason compare Otherwise we attempt to compare a bytes to a str on Python 3 and it always fails. Differential Revision: https://phab.mercurial-scm.org/D5721

keepalive: track ready state with a bool This code may have been written before Python had a bool type. Differential Revision: https://phab.mercurial-scm.org/D5719

keepalive: use collections.defaultdict for host map Cleaning up the code as part of debugging Python 3 issues. Differential Revision: https://phab.mercurial-scm.org/D5718

statichttprepo: use str to appease Python 3 The URL fed into urllib and HTTP headers need to be str on Python 3. Differential Revision: https://phab.mercurial-scm.org/D5716

statichttprepo: use URLError.reason directly 0b3f4be5c5bf changed str(inst) to inst.reason[0] all the way back in 2006. URLError.reason is a str and we should have taken that attribute in its entirety. I think the code was supposed to be inst.args[1] for compatibility with ancient Python versions. Python 2.7 always sets .reason, so it should be safe to use directly. Differential Revision: https://phab.mercurial-scm.org/D5715

mail: document behavior of Python 3 test-notify.t (and possibly other tests) are failing on Python 3 because email.message.Message is now aware of encodings and attempts to roundtrip values with the specified message encoding. Python 2 doesn't perform this roundtripping. We have tests with non-ascii data being serialized to a message that claims to use ascii encoding. I /think/ Mercurial's behavior may be buggy here. But I'm not sure. I'm documenting the behavior so the next person who looks into this doesn't start from scratch like I did. Differential Revision: https://phab.mercurial-scm.org/D5714

notify: be more defensive aboute None values encoding.strtolocal is the identity function on Python 2 but an actual string manipulation routine on Python 3. In some cases, we were passing None, which caused Python 3 to barf. Let's change the code to react properly when the value is None. Differential Revision: https://phab.mercurial-scm.org/D5713

wireprotov2server: use our JSON encoder Python's json module doesn't like to encode bytes instances. This makes this code difficult to work with Python 3. We simply swap in Mercurial's JSON encoder to work around it. Differential Revision: https://phab.mercurial-scm.org/D5712

tests: add optional setsockopt() lines for Python 3 Differential Revision: https://phab.mercurial-scm.org/D5711

diffstat: support filenames with whitespaces on renames This is a follow-up patch to D5628. `line.split()` cannot get filenames with whitespaces as mentioned by @yuja. This patch replaces `split()` method with `slice`. Corresponding tests were also added. Differential Revision: https://phab.mercurial-scm.org/D5709

largefiles: avoid walking full manifest When using treemanifest, diffs between two manifests can often be much cheaper than iterating the full manifests (because common subtrees are skipped). Differential Revision: https://phab.mercurial-scm.org/D5644

cleanup: use p1() instead of parents() when we only need the first parent Differential Revision: https://phab.mercurial-scm.org/D5708

cleanup: use repo['.'] instead of repo[None].p1() Differential Revision: https://phab.mercurial-scm.org/D5707

cleanup: use p1() and p2() instead of parents()[0] and parents()[1] We have had these methods on both contexts and dirstate for a long time now. Differential Revision: https://phab.mercurial-scm.org/D5706

branchmap: rename partial -> bcache The name better reflects that we have a branchcache object here, even if at *some point* it is still being constructed. Differential Revision: https://phab.mercurial-scm.org/D5290

context: delete mistaken comment about return value of renamed() The comment seems to think that the return value of renamed() is a tuple of source pathsx in the parents, but it's actually a pair of (rename source path, file nodeid). Differential Revision: https://phab.mercurial-scm.org/D5639