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tracked-key: remove the dual write and rename to tracked-hint...
tracked-key: remove the dual write and rename to tracked-hint The dual-write approach was mostly useless. As explained in the previous version of the help, the key had to be read twice before we could cache a value. However this "read twice" limitation actually also apply to any usage of the key. If some operation wants to rely of the "same value == same tracked set" property it would need to read the value before, and after running that operation (or at least, after, in all cases). So it cannot be sure the operation it did is "valid" until checking the key after the operation. As a resultat such operation can only be read-only or rollbackable. This reduce the utility of the "same value == same tracked set" a lot. So it seems simpler to drop the double write and to update the documentation to highlight that this file does not garantee race-free operation. As a result the "key" is demoted to a "hint". Documentation is updated accordingly. Differential Revision: https://phab.mercurial-scm.org/D12201
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Requirements

Building the Inno installer requires a Windows machine.

The following system dependencies must be installed:

Building

The packaging.py script automates the process of producing an Inno installer. It manages fetching and configuring the non-system dependencies (such as py2exe, gettext, and various Python packages).

The script requires an activated Visual C++ 2008 command prompt. A shortcut to such a prompt was installed with Microsoft Visual C++ Compiler for Python 2.7. From your Start Menu, look for Microsoft Visual C++ Compiler Package for Python 2.7 then launch either Visual C++ 2008 32-bit Command Prompt or Visual C++ 2008 64-bit Command Prompt.

From the prompt, change to the Mercurial source directory. e.g. cd c:\src\hg.

Next, invoke packaging.py to produce an Inno installer. You will need to supply the path to the Python interpreter to use.:

$ py -3 contrib\packaging\packaging.py \
    inno --python c:\python27\python.exe

Note

The script validates that the Visual C++ environment is active and that the architecture of the specified Python interpreter matches the Visual C++ environment and errors if not.

If everything runs as intended, dependencies will be fetched and configured into the build sub-directory, Mercurial will be built, and an installer placed in the dist sub-directory. The final line of output should print the name of the generated installer.

Additional options may be configured. Run packaging.py inno --help to see a list of program flags.

MinGW

It is theoretically possible to generate an installer that uses MinGW. This isn't well tested and packaging.py and may properly support it. See old versions of this file in version control for potentially useful hints as to how to achieve this.