commandserver: drop old unixservice implementation It's been superseded by unixforkingservice.

chgserver: switch to new forking service Threading and complex classes are no longer necessary. _autoexitloop() has been replaced by polling cycle in the main thread.

chgserver: extract stub factory of service object The class inheritance will be replaced by composition. See the next patch for details.

chgserver: reorder service classes to make future patches readable Includes no functional change.

commandserver: add new forking server implemented without using SocketServer SocketServer.ForkingMixIn of Python 2.x has a couple of issues, such as: - race condition that leads to 100% CPU usage (Python 2.6) https://bugs.python.org/issue21491 - can't wait for children belonging to different process groups (Python 2.6) - leaves at least one zombie process (Python 2.6, 2.7) https://bugs.python.org/issue11109 The first two are critical because we do setpgid(0, 0) in child process to isolate terminal signals. The last one isn't, but ForkingMixIn seems to be doing silly. So there are two choices: a) backport and maintain SocketServer until we can drop support for Python 2.x b) replace SocketServer by simpler one and eliminate glue codes I chose (b) because it's great time for getting rid of utterly complicated SocketServer stuff, and preparing for future move towards prefork service. New unixforkingservice is implemented loosely based on chg 531f8ef64be6. It is monolithic but much simpler than SocketServer. unixservicehandler provides customizing points for chg, and it will be shared with future prefork service. Old unixservice class is still used by chgserver. It will be removed later. Thanks to Jun Wu for investigating these issues.

commandserver: extract function that serves for the current connection This will be used by new server implementation.

commandserver: manually create file objects from socket Prepares for moving away from SocketServer. See the subsequent patches for why.

bdiff: split bdiff into cpy-aware and cpy-agnostic part

bdiff: rename functions and structs to be amenable for later exporting

bdiff: use ssize_t in favor of Py_ssize_t in cpython-unaware locations This function and struct will be exposed via cffi, so we need to remove the cpython API dependency they currently have.

hgweb: enumerate lines in loop header, not before Doing this will allow access to the lines in arbitrary order (because the result of enumerate() is an iterator), and that will help calculating rowspan for annotate blocks.

sslutil: add assertion to prevent accidental CA usage on Windows Yuya suggested we add this check to ensure we don't accidentally try to load user-writable paths on Windows if we change the control flow of this function later.

shelve: make unshelve be able to abort in any case

osx: explicitly build hg with /usr/bin/python2.7 This should help avoid creating a package that depends on a custom Python, as happened when I built a package for 3.8.

osx: correct comment about ordering of welcome page

osx: jettison outdated build instructions

commandserver: extract _cleanup() hook to clarify chg is doing differently This makes it clear that chg needs its own way to unlink closed socket file. I made a mistake in draft patches without noting the difference.

chgserver: drop repo at chgunixservice.__init__() Since it isn't expensive operation, we don't have to delay it to init().

chgserver: extract utility to bind unix domain socket to long path This is common problem of using sockaddr_un.

chgserver: narrow scope of chdir() to socket.bind() This helps extracting a utility function.

annotate: handle empty files earlier Rather than looping on funcmap and then checking for non-zero `l` continue if the result of fctx.annotate is empty.

context: eliminate handling of linenumber being None in annotate I could not find any use of this parameter value. And it arguably makes understanding of the function more difficult. Setting the parameter default value to False.

tests: regenerate x509 test certificates The old x509 test certificates were using cryptographic settings that are ancient by today's standards, namely 512 bit RSA keys. To put things in perspective, browsers have been dropping support for 1024 bit RSA keys. I think it is important that tests match the realities of the times. And 2048 bit RSA keys with SHA-2 hashing are what the world is moving to. This patch replaces all the x509 certificates with new versions using modern best practices. In addition, the docs for generating the keys have been updated, as the existing docs left out a few steps, namely how to generate certs that were not active yet or expired.

hgweb: add a link on node id in annotate hover-box The link pointing the annotate view at this revision, just like the one in the left-column but accessible from anywhere.

hgweb: move author information from left-column to hover-box in annotate view And display the full author information since there is enough space there.

hgweb: add links to diff and changeset in hover-box on annotate view

hgweb: add link to parents of annotated revision in annotate view The link is embedded into a div with class="annotate-info" that only shows up upon hover of the annotate column. To avoid duplicate hover-overs (this new one and the one coming from link's title), drop "title" attribute from a element and put it in the annotate-info element.

compat: provide a declaration of ssize_t, for MS windows

check-code: enforce (glob) on output lines containing 127.0.0.1

tests: add (glob) annotations to output lines with 127.0.0.1