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packaging: add -python2 to Windows installer filenames...

packaging: add -python2 to Windows installer filenames We just taught the Windows installers to produce Python 3 variants built with PyOxidizer. Our plan is to publish both Python 2 and Python 3 versions of the installers for Mercurial 5.4. This commit teaches the Inno and WiX installers to add an optional string suffix to the installer name. On Python 2, that suffix is "-python2." We reserve the existing name for the Python 3 installers, which we want to make the default. Differential Revision: https://phab.mercurial-scm.org/D8479

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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

      This project currently requires an unreleased version of PyOxidizer

      (0.7.0-pre). For best results, build the exact PyOxidizer commit

      as defined in the `pyoxidizer.bzl` file:

          $ git clone https://github.com/indygreg/PyOxidizer.git

          $ cd PyOxidizer

          $ git checkout <Git commit from pyoxidizer.bzl>

          $ cargo build --release

      Then build this Rust project using the built `pyoxidizer` executable::

          $ /path/to/pyoxidizer/target/release/pyoxidizer build

      If all goes according to plan, there should be an assembled application

      under `build/<arch>/debug/app/` with an `hg` executable:

          $ build/x86_64-unknown-linux-gnu/debug/app/hg version

          Mercurial Distributed SCM (version 5.3.1+433-f99cd77d53dc+20200331)

          (see https://mercurial-scm.org for more information)

          Copyright (C) 2005-2020 Matt Mackall and others

          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

          $ PYTHONPATH=`pwd`/.. python3.7 run-tests.py \

              --with-hg `pwd`/../rust/hgcli/build/x86_64-unknown-linux-gnu/debug/app/hg

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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

		This project currently requires an unreleased version of PyOxidizer
		(0.7.0-pre). For best results, build the exact PyOxidizer commit
		as defined in the `pyoxidizer.bzl` file:

		$ git clone https://github.com/indygreg/PyOxidizer.git
		$ cd PyOxidizer
		$ git checkout <Git commit from pyoxidizer.bzl>
		$ cargo build --release

		Then build this Rust project using the built `pyoxidizer` executable::

		$ /path/to/pyoxidizer/target/release/pyoxidizer build

		If all goes according to plan, there should be an assembled application
		under `build/<arch>/debug/app/` with an `hg` executable:

		$ build/x86_64-unknown-linux-gnu/debug/app/hg version
		Mercurial Distributed SCM (version 5.3.1+433-f99cd77d53dc+20200331)
		(see https://mercurial-scm.org for more information)

		Copyright (C) 2005-2020 Matt Mackall and others
		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
		$ PYTHONPATH=`pwd`/.. python3.7 run-tests.py \
		--with-hg `pwd`/../rust/hgcli/build/x86_64-unknown-linux-gnu/debug/app/hg