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add more developer docs #1089

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add more developer docs #1089

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1aa60de
add more developer docs
May 8, 2020
bc2c888
Update docs for pyqt5-dev build
emkll Nov 23, 2020
b2cf872
Use pyqt-sip 4.19.14
emkll Nov 23, 2020
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71 changes: 71 additions & 0 deletions README.md
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Expand Up @@ -357,6 +357,7 @@ Note: One of the functional tests deletes a source, so you may need to add it ba
7. Add a detached signature (with the release key) for the source tarball.
8. Submit the source tarball and signature via PR into this [repository](https://github.com/freedomofpress/securedrop-debian-packaging) along with the debian changelog addition. This tarball and changelog will be used by the package builder.


## Debugging

To use `pdb`, add these lines:
Expand All @@ -369,3 +370,73 @@ Then you can use [`pdb` commands](https://docs.python.org/3/library/pdb.html#deb

Logs can be found in the `{sdc-home}/logs`. If you are debugging a version of this application installed from a deb package in Qubes, you can debug issues by looking at the log file in `~/.securedrop_client/logs/client.log`. You can also add additional log lines in the running code in
`/opt/venvs/securedrop-client/lib/python3.7/site-packages/securedrop_client/`.

Sometimes there is a bug in Qt rather than the client, so it helps to install [a debug version of PyQt5](#build-and-install-a-debug-version-of-pyqt5) which will allow you to see Qt debug symbols in your Python tracebacks. You can use `gdb` to view a traceback as well as a core file, if you're debugging a segfault, but first you must need to install the following some additional packages in order for `gdb` to work with Python programs.

```
sudo apt-get install libclang-dev '^libxcb.*-dev' libx11-xcb-dev libglu1-mesa-dev libxrender-dev libxi-dev libxkbcommon-dev libxkbcommon-x11-dev gperf bison flex libgl1-mesa-dev pkg-config libdbus-1-dev libnss3-dev libfontconfig1-dev libxi-dev libxcomposite-dev libxcursor-dev libxtst-dev python3-sip-dev
```

### Build and install a debug version of PyQt5

Note that the resulting artifacts should not be used in production contexts, and are used to debug issues in development environments only.

1. Build a debug version of Qt 5
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We should also add a line about required free space for a debug build.

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good call.. my qt5-build directory is 1.9 GB, is that what you're seeing?

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I am seeing significantly more than that:

user@dev-python:~$ du -sh qt5*
6.7G	qt5
5.2G	qt5-build


Clone the Qt repo and build it from source following these instructions: https://wiki.qt.io/Building_Qt_5_from_Git#Getting_the_source_code. This defaults to creating a 'debug' build and installs the binaries in the current directory, avoiding the need for `make install`. Note that the `-developer-build` option causes more symbols to be exported in order to allow more classes and functions to be unit tested than in a regular Qt build.

```
git clone https://code.qt.io/qt/qt5.git
cd qt5
git checkout v5.11.3 # or checkout a different version
git submodule update --init --recursive
export LLVM_INSTALL_DIR=/usr/llvm
mkdir ../qt5-build && cd ../qt5-build # we don't want to build in the source code directory
../qt5/configure -developer-build -opensource -nomake examples -nomake tests -confirm-license
make -j 4
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This step took ~1h on my computer, perhaps worth mentioning either here or elsewhere in the docs that this takes a while

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We will also need to build qttools here for the PySide2.

make -j 4 module-qttools

```

2. Prepare to build PyQt5

We are going to use the client virtual environment to build and install PyQt5. Make sure the client dependencies are installed. This will include `pyqt5-sip` which will be used when we build pyqt5 from source.

If you haven't already, download the client and set up the virtual environment.

```
git clone git@github.com:freedomofpress/securedrop-client.git
cd securedrop-client
virtualenv --python=python3.7 .venv
source .venv/bin/activate
pip install --require-hashes -r dev-requirements.txt
```

Make sure to uninstall the prepackaged pyqt5 library since we will be using our own.

```
pip uninstall pyqt5
```

3. Download the PyQt5 source tarball

```
wget http://deb.debian.org/debian/pool/main/p/pyqt5/pyqt5_5.11.3+dfsg.orig.tar.gz
```

4. Build and install PyQt5

Make sure you are still in the client virtual environment before building PyQt5.

```
tar -xzvf pyqt5_5.11.3+dfsg.orig.tar.gz
cd PyQt5_gpl-5.11.3
pip install PyQt-builder
export PATH=~/qt5-build/qtbase/bin:$PATH
export QT_PLUGIN_PATH=~/qt5-build/qtbase/plugins
python3 configure.py --verbose --qmake=~/qt5-build/qtbase/bin/qmake
make install
```
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This step took 15-20 minutes (17M of disk space used, which is probably negligible in context)


### Find/report a Qt bug

1. Create a Qt account: https://login.qt.io/register
2. Find or report a bug here: https://bugreports.qt.io
1 change: 1 addition & 0 deletions requirements/dev-requirements.in
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Expand Up @@ -21,6 +21,7 @@ pyobjc-core==6.2;platform_system=="Darwin"
pyobjc==6.2;platform_system=="Darwin"
pyflakes==2.0.0
PyQt5==5.11.3
PyQt5-sip==4.19.14
pytest==5.2.1
pytest-cov==2.8.1
pytest-mock==1.10.0
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32 changes: 14 additions & 18 deletions requirements/dev-requirements.txt
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Expand Up @@ -262,24 +262,20 @@ pyparsing==2.4.7 \
pyperclip==1.7.0 \
--hash=sha256:979325468ccf682104d5dcaf753f869868100631301d3e72f47babdea5700d1c \
# via mouseinfo
pyqt5-sip==4.19.19 \
--hash=sha256:304acf771b6033cb4bafc415939d227c91265d30664ed643b298d7e95f509f81 \
--hash=sha256:39d2677f4de46ed4d7aa3b612f31c74c881975efe51c6a23fbb1d9382e4cc850 \
--hash=sha256:54b99a3057e8f01b90d49cca9ca566b1ea23d8920038760f44e75b90c62b9d5f \
--hash=sha256:59f5332f86f3ccd3ac94674fe91eae6e8aca26da7c6588917cabd0fe22af106d \
--hash=sha256:72be07a21b0f379987c4ec59bc86834a9719a2f9cfb49606a4d4e34dae9aa549 \
--hash=sha256:7b3b8c015e545fa30e42205fc1115b7c6afcb6acec790ce3f330a06323730523 \
--hash=sha256:7fbb6389c20aff4c3257e89bb1787effffcaf05c32d937c00094ae45846bffd5 \
--hash=sha256:828d9911acc483672a2bae1cc1bf79f591eb3338faad1f2c798aa2f45459a318 \
--hash=sha256:a9460dac973deccc6ff2d90f18fd105cbaada147f84e5917ed79374dcb237758 \
--hash=sha256:aade50f9a1b9d20f6aabe88e8999b10db57218f5c31950160f3f7957dd64e07c \
--hash=sha256:ac9e5b282d1f0771a8310ed974afe1961ec31e9ae787d052c0e504ea46ae323a \
--hash=sha256:ba41bd21b89c6713f7077b5f7d4a1c452989190aad5704e215560a266a1ecbab \
--hash=sha256:c309dbbd6c155e961bfd6893496afa5cd184cce6f7dffd87ea68ee048b6f97e1 \
--hash=sha256:cfc21b1f80d4655ffa776c505a2576b4d148bbc52bb3e33fedbf6cfbdbc09d1b \
--hash=sha256:d7b26e0b6d81bf14c1239e6a891ac1303a7e882512d990ec330369c7269226d7 \
--hash=sha256:f8b7a3e05235ce58a38bf317f71a5cb4ab45d3b34dc57421dd8cea48e0e4023e \
# via pyqt5
pyqt5-sip==4.19.14 \
--hash=sha256:04bd0bb8b6f8fa03c2dfbdfff0c8c9bfb3f46a21dd4cac73983dae93bf949523 \
--hash=sha256:058d450c26be92193605f4628ff690d77080f599ffe381a1029cea8eeb71ab8e \
--hash=sha256:0b838ef8a55461785e78b4e347cf52ce228a5d4392c57e07cc46de51433dc8ac \
--hash=sha256:40504f96ecb834e54491ead558589bfd773056dba7f2df76599a06fdd8ed1ead \
--hash=sha256:49b2151bd0a0e439efc9d4c22c33a048d8e8ede5c7296851c221fa0988887edb \
--hash=sha256:6540b510f9436fe2d65801af55ecbf8c43bdda47294e994ed3851403a93e4a8b \
--hash=sha256:6b3063b12e700944172d57cdbeafb363229669af933f873d01c7a6d8a91c4c87 \
--hash=sha256:6b65d2b14084eb583bf4cf68b97ade295fabae5f5bf2aae0ab00ab30533f1c60 \
--hash=sha256:6ca796071b21761917ee486e57bfa2fc694580e65c462e4173cf849ed8fe201c \
--hash=sha256:6d3013a6820ea614f46fdc73cc16dd57c36a0c74bcbd38bd0b9f2d46b6e6dd16 \
--hash=sha256:84f7401afdd5f31e961de75e9c6b1610849e8883fbe0ed675bbb7d7d97286347 \
--hash=sha256:bb81cfc4d35ca59f1c419b6abeb6ca6a726a63b712cf979f2b5ab24b81c36f49 \
# via -r requirements/dev-requirements.in, pyqt5
pyqt5==5.11.3 \
--hash=sha256:517e4339135c4874b799af0d484bc2e8c27b54850113a68eec40a0b56534f450 \
--hash=sha256:ac1eb5a114b6e7788e8be378be41c5e54b17d5158994504e85e43b5fca006a39 \
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