bitcoin/contrib/devtools/README.md

Contents
========
This directory contains tools for developers working on this repository.

clang-format-diff.py
===================

A script to format unified git diffs according to [.clang-format](../../src/.clang-format).

Requires `clang-format`, installed e.g. via `brew install clang-format` on macOS.

For instance, to format the last commit with 0 lines of context,
the script should be called from the git root folder as follows.

```
git diff -U0 HEAD~1.. | ./contrib/devtools/clang-format-diff.py -p1 -i -v
```

copyright\_header.py
====================

Provides utilities for managing copyright headers of `The Bitcoin Core
developers` in repository source files. It has three subcommands:

```
$ ./copyright_header.py report <base_directory> [verbose]
$ ./copyright_header.py update <base_directory>
$ ./copyright_header.py insert <file>
```
Running these subcommands without arguments displays a usage string.

copyright\_header.py report \<base\_directory\> [verbose]
---------------------------------------------------------

Produces a report of all copyright header notices found inside the source files
of a repository. Useful to quickly visualize the state of the headers.
Specifying `verbose` will list the full filenames of files of each category.

copyright\_header.py update \<base\_directory\> [verbose]
---------------------------------------------------------
Updates all the copyright headers of `The Bitcoin Core developers` which were
changed in a year more recent than is listed. For example:
```
// Copyright (c) <firstYear>-<lastYear> The Bitcoin Core developers
```
will be updated to:
```
// Copyright (c) <firstYear>-<lastModifiedYear> The Bitcoin Core developers
```
where `<lastModifiedYear>` is obtained from the `git log` history.

This subcommand also handles copyright headers that have only a single year. In
those cases:
```
// Copyright (c) <year> The Bitcoin Core developers
```
will be updated to:
```
// Copyright (c) <year>-<lastModifiedYear> The Bitcoin Core developers
```
where the update is appropriate.

copyright\_header.py insert \<file\>
------------------------------------
Inserts a copyright header for `The Bitcoin Core developers` at the top of the
file in either Python or C++ style as determined by the file extension. If the
file is a Python file and it has  `#!` starting the first line, the header is
inserted in the line below it.

The copyright dates will be set to be `<year_introduced>-<current_year>` where
`<year_introduced>` is according to the `git log` history. If
`<year_introduced>` is equal to `<current_year>`, it will be set as a single
year rather than two hyphenated years.

If the file already has a copyright for `The Bitcoin Core developers`, the
script will exit.

gen-manpages.sh
===============

A small script to automatically create manpages in ../../doc/man by running the release binaries with the -help option.
This requires help2man which can be found at: https://www.gnu.org/software/help2man/

With in-tree builds this tool can be run from any directory within the
repostitory. To use this tool with out-of-tree builds set `BUILDDIR`. For
example:

```bash
BUILDDIR=$PWD/build contrib/devtools/gen-manpages.sh
```

optimize-pngs.py
================

A script to optimize png files in the bitcoin
repository (requires pngcrush).

security-check.py and test-security-check.py
============================================

Perform basic security checks on a series of executables.

symbol-check.py
===============

A script to check that the (Linux) executables produced by gitian only contain
allowed gcc, glibc and libstdc++ version symbols. This makes sure they are
still compatible with the minimum supported Linux distribution versions.

Example usage after a gitian build:

    find ../gitian-builder/build -type f -executable | xargs python3 contrib/devtools/symbol-check.py

If only supported symbols are used the return value will be 0 and the output will be empty.

If there are 'unsupported' symbols, the return value will be 1 a list like this will be printed:

    .../64/test_bitcoin: symbol memcpy from unsupported version GLIBC_2.14
    .../64/test_bitcoin: symbol __fdelt_chk from unsupported version GLIBC_2.15
    .../64/test_bitcoin: symbol std::out_of_range::~out_of_range() from unsupported version GLIBCXX_3.4.15
    .../64/test_bitcoin: symbol _ZNSt8__detail15_List_nod from unsupported version GLIBCXX_3.4.15

circular-dependencies.py
========================

Run this script from the root of the source tree (`src/`) to find circular dependencies in the source code.
This looks only at which files include other files, treating the `.cpp` and `.h` file as one unit.

Example usage:

    cd .../src
    ../contrib/devtools/circular-dependencies.py {*,*/*,*/*/*}.{h,cpp}