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hgweb: encode WSGI environment using the ISO-8859-1 codec...
hgweb: encode WSGI environment using the ISO-8859-1 codec The WSGI specification (PEP 3333) specifies that on Python 3 all strings passed by the server must be of type str with code points encodable using the ISO 8859-1 codec. For some reason, I introduced a bug in 2632c1ed8f34 by applying the reverse change. Maybe I got confused because PEP 3333 says that arbitrary operating system environment variables may be contained in the WSGI environment and therefore we need to handle the WSGI environment variables like we would handle operating system environment variables. The bug mentioned in the previous paragraph and fixed by this changeset manifested e.g. in the path of the URL being encoded in the wrong way. Browsers encode non-ASCII bytes with the percent-encoding. WSGI servers will decode the percent-encoded bytes and pass them to the application as strings where each byte is mapped to the corresponding code point with the same ordinal (i.e. it is decoded using the ISO-8859-1 codec). Mercurial uses the bytes type for these strings (which makes much more sense), so we need to encode it again using the ISO-8859-1 codec. If we use another codec, it can result in nonsense.

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README.md
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Gregory Szorc
hgcli: customize for Mercurial...
r45129 # Oxidized Mercurial
This project provides a Rust implementation of the Mercurial (`hg`)
version control tool.
Under the hood, the project uses
[PyOxidizer](https://github.com/indygreg/PyOxidizer) to embed a Python
interpreter in a binary built with Rust. At run-time, the Rust `fn main()`
is called and Rust code handles initial process startup. An in-process
Python interpreter is started (if needed) to provide additional
functionality.
# Building
Kyle Lippincott
pyoxidizer: update README.md with several small fixes...
r49087 First, acquire and build a copy of PyOxidizer; you probably want to do this in
some directory outside of your clone of Mercurial:
Gregory Szorc
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r45129
$ git clone https://github.com/indygreg/PyOxidizer.git
$ cd PyOxidizer
$ cargo build --release
Kyle Lippincott
pyoxidizer: update README.md with several small fixes...
r49087 Then build this Rust project using the built `pyoxidizer` executable:
Gregory Szorc
hgcli: customize for Mercurial...
r45129
Kyle Lippincott
pyoxidizer: update README.md with several small fixes...
r49087 $ /path/to/pyoxidizer/target/release/pyoxidizer build --release
Gregory Szorc
hgcli: customize for Mercurial...
r45129
If all goes according to plan, there should be an assembled application
Kyle Lippincott
pyoxidizer: update README.md with several small fixes...
r49087 under `build/<arch>/release/app/` with an `hg` executable:
Gregory Szorc
hgcli: customize for Mercurial...
r45129
Kyle Lippincott
pyoxidizer: update README.md with several small fixes...
r49087 $ build/x86_64-unknown-linux-gnu/release/app/hg version
Gregory Szorc
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r45129 Mercurial Distributed SCM (version 5.3.1+433-f99cd77d53dc+20200331)
(see https://mercurial-scm.org for more information)
Raphaël Gomès
contributor: change mentions of mpm to olivia...
r47575 Copyright (C) 2005-2020 Olivia Mackall and others
Gregory Szorc
hgcli: customize for Mercurial...
r45129 This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# Running Tests
To run tests with a built `hg` executable, you can use the `--with-hg`
argument to `run-tests.py`. But there's a wrinkle: many tests run custom
Python scripts that need to `import` modules provided by Mercurial. Since
these modules are embedded in the produced `hg` executable, a regular
Python interpreter can't access them! To work around this, set `PYTHONPATH`
to the Mercurial source directory. e.g.:
$ cd /path/to/hg/src/tests
Kyle Lippincott
pyoxidizer: update README.md with several small fixes...
r49087 $ PYTHONPATH=`pwd`/.. python3.9 run-tests.py \
--with-hg `pwd`/../rust/hgcli/build/x86_64-unknown-linux-gnu/release/app/hg