4.1.5->4.2.1, the appimage grew 54M->66M. This change shrinks it back to 58M.
```
$ ls -lah
total 224M
drwxrwxr-x 5 user user 4.0K Mar 27 18:18 .
drwxrwxr-x 16 user user 4.0K Mar 23 16:02 ..
-rwxrw-r-- 1 user user 48M Dec 18 2020 electrum-4.0.9-x86_64.AppImage
-rwxrw-r-- 1 user user 54M Jan 19 14:25 electrum-4.1.5-x86_64.AppImage
-rwxr-xr-x 1 user user 58M Mar 27 18:12 electrum-4.2.1-dirty-x86_64.AppImage
-rwxrw-r-- 1 user user 66M Mar 27 15:00 electrum-4.2.1-x86_64.AppImage
```
I've used the great `ncdu` tool to investigate file sizes.
```
$ du squashfs-root-415/usr/lib/python3.7/ --max-depth=1 | sort -nr | head -n8
154608 squashfs-root-415/usr/lib/python3.7/
138864 squashfs-root-415/usr/lib/python3.7/site-packages
4720 squashfs-root-415/usr/lib/python3.7/lib-dynload
1744 squashfs-root-415/usr/lib/python3.7/encodings
664 squashfs-root-415/usr/lib/python3.7/pydoc_data
460 squashfs-root-415/usr/lib/python3.7/distutils
460 squashfs-root-415/usr/lib/python3.7/asyncio
436 squashfs-root-415/usr/lib/python3.7/email
$ du squashfs-root-421/usr/lib/python3.9/ --max-depth=1 | sort -nr | head -n8
194088 squashfs-root-421/usr/lib/python3.9/
143512 squashfs-root-421/usr/lib/python3.9/site-packages
33824 squashfs-root-421/usr/lib/python3.9/config-3.9-x86_64-linux-gnu
5244 squashfs-root-421/usr/lib/python3.9/lib-dynload
1720 squashfs-root-421/usr/lib/python3.9/encodings
696 squashfs-root-421/usr/lib/python3.9/pydoc_data
520 squashfs-root-421/usr/lib/python3.9/asyncio
464 squashfs-root-421/usr/lib/python3.9/distutils
```
We should delete `usr/lib/python3.9/config-3.9-x86_64-linux-gnu/` (which is 33M unpacked)
With py3.7 (electrum 4.1.5), this folder was named `config-3.7m-x86_64-linux-gnu`,
presumably because the default config to compile py3.7 was `--with-pymalloc`,
but maybe it is not for py3.9... ? not sure. (see https://peps.python.org/pep-3149/ )
This is bumping the python versions bundled inside our binaries.
For macOS and AppImage, from 3.9.10 to 3.9.11.
For Android, from 3.8.12 to 3.8.13.
Windows is left untouched as I am having issues with the wine build when using 3.9.11.
(see https://github.com/spesmilo/electrum/pull/7721#issuecomment-1071901116 )
The latest release of appimagetool bundles a new enough version of
mksquashfs. We had been building a fork of mksquashfs but all the
relevant patches there had been upstreamed.
Note: we still need a wrapper when calling mksquashfs, as appimagetool
calls it with "-mkfs-time 0" and we have the SOURCE_DATE_EPOCH env var
set; and these two would conflict.
Two ways to fix: either unset SOURCE_DATE_EPOCH for that context, or
build a wrapper that removes the "-mkfs-time 0". The former would be
cleaner but for some reason I did not manage to build reproducibly
that way. The latter seems to work.
related:
- https://github.com/AppImage/AppImageKit/issues/929#issuecomment-580769875
> Now official squashfs 4.4 makes reproducible images by default
- https://github.com/AppImage/AppImageKit/pull/996
Ubuntu 20.04 needs `libxcb-xinerama.so.0`
and Debian 10 needs `libxcb-util.so.1` for the Qt `xcb` plugin.
-----
ported from 380f04a805
see https://github.com/Electron-Cash/Electron-Cash/issues/2196
-----
In particular, see this comment:
>> I confirmed that both Ubuntu 20.04 and Debian 10.8 clean install have an issue with the 4.2.4 AppImage.
>
> Any idea what broke it? I assume it used to work.
Yes, it did work in 4.2.3 which used PyQt5 5.13.2. I just had a look at the xcb plugin and it definitely has less dependencies:
```
ago@ubuntu2004vm:~/src/Electron-Cash/dist$ ldd squashfs-root/usr/lib/python3.6/site-packages/PyQt5/Qt/plugins/platforms/libqxcb.so|grep xcb
libX11-xcb.so.1 => /lib/x86_64-linux-gnu/libX11-xcb.so.1 (0x00007f0ec9d07000)
libxcb.so.1 => /lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f0ec9cdd000)
libxcb-xkb.so.1 => /lib/x86_64-linux-gnu/libxcb-xkb.so.1 (0x00007f0ec6ead000)
```
compared to PyQt5 5.15.2 in 4.2.4:
```
ago@ubuntu2004vm:~/src/Electron-Cash/dist$ ldd squashfs-root/usr/lib/python3.8/site-packages/PyQt5/Qt/plugins/platforms/libqxcb.so|grep xcb
libX11-xcb.so.1 => /lib/x86_64-linux-gnu/libX11-xcb.so.1 (0x00007fcb5715f000)
libxcb-icccm.so.4 => /lib/x86_64-linux-gnu/libxcb-icccm.so.4 (0x00007fcb57158000)
libxcb-image.so.0 => /lib/x86_64-linux-gnu/libxcb-image.so.0 (0x00007fcb56f51000)
libxcb-shm.so.0 => /lib/x86_64-linux-gnu/libxcb-shm.so.0 (0x00007fcb56f4c000)
libxcb-util.so.1 => /lib/x86_64-linux-gnu/libxcb-util.so.1 (0x00007fcb56d46000)
libxcb-keysyms.so.1 => /lib/x86_64-linux-gnu/libxcb-keysyms.so.1 (0x00007fcb56d41000)
libxcb-randr.so.0 => /lib/x86_64-linux-gnu/libxcb-randr.so.0 (0x00007fcb56d2e000)
libxcb-render-util.so.0 => /lib/x86_64-linux-gnu/libxcb-render-util.so.0 (0x00007fcb56d27000)
libxcb-render.so.0 => /lib/x86_64-linux-gnu/libxcb-render.so.0 (0x00007fcb56d16000)
libxcb-shape.so.0 => /lib/x86_64-linux-gnu/libxcb-shape.so.0 (0x00007fcb56d11000)
libxcb-sync.so.1 => /lib/x86_64-linux-gnu/libxcb-sync.so.1 (0x00007fcb56d07000)
libxcb-xfixes.so.0 => /lib/x86_64-linux-gnu/libxcb-xfixes.so.0 (0x00007fcb56cfd000)
libxcb-xinerama.so.0 => /lib/x86_64-linux-gnu/libxcb-xinerama.so.0 (0x00007fcb56cf8000)
libxcb-xkb.so.1 => /lib/x86_64-linux-gnu/libxcb-xkb.so.1 (0x00007fcb56cda000)
libxcb.so.1 => /lib/x86_64-linux-gnu/libxcb.so.1 (0x00007fcb56cae000)
```
Had to also bump ubuntu version 18.04->20.04,
as was getting errors running the self-compiled pyinstaller otherwise (weird...):
```
from .utils.git import get_repo_revision
ModuleNotFoundError: No module named 'PyInstaller.utils'
```
(similar to https://github.com/pyinstaller/pyinstaller/issues/4403 )
-----
Note re appimage: when trying to compile python 3.8.x on ubuntu 16.04, I am getting:
./Modules/posixmodule.c: In function ‘os_copy_file_range_impl’:
./Modules/posixmodule.c:10351:15: error: implicit declaration of function ‘copy_file_range’ [-Werror=implicit-function-declaration]
ret = copy_file_range(src, p_offset_src, dst, p_offset_dst, count, flags);
This is because ubuntu 16.04 has too old glibc.
If there is a collision between a branch name and a commit hash, git
will choose the branch, even if the full 40-hex-long commit hash is
given. GitHub disallows branches/tags with such a name but git itself
does not. By adding the `^{commit}` syntax sugar after a ref name,
we can tell git that we want the commit hash to be preferred,
and hence we don't need to trust GitHub (only git).
see https://security.stackexchange.com/questions/225411/
All (incl indirect) dependencies are already listed in deterministic-build/requirements*.txt.
This option makes it easier to manually rm a dependency from that list for e.g. testing.
Slightly reduces file size, improves build speed and makes build more
reproducible.
The .comment section contained GCC version information which could cause
different build output from just a minor update in GCC. The information is not
needed so we strip this.
The strip command was invoked using xargs, spawning a new process for each file.
This is inefficient as xargs can correctly run the strip command with multiple
file names.
-----
taken from 43aaf9572f
On Ubuntu host, build succeeded; but e.g. on Manjaro host, it failed with:
```
./build.sh: line 233: /opt/electrum/contrib/build-linux/appimage/../../../contrib/build-linux/appimage/.cache/appimage/appimagetool: No such file or directory
```
This slightly increases the AppImage size but allows us to be more
compatible with older distributions.
-----
taken from Electron-Cash/Electron-Cash@96644acd6fd66f866a86613974bb68bb99f00d8c
It warns about scripts being installed in a location that is not on the
path, but that is inconsequential as they are not used.
-----
taken from Electron-Cash/Electron-Cash@9a29017c5d8906bb04f7e188bf483b0d3ff698f4
When building in docker on macOS, python builds with .exe extension
because the case insensitive file system of macOS leaks into docker.
This causes the build to result in a different output on macOS compared
to Linux. We simply patch sysconfigdata to remove the extension.
Some more info: https://bugs.python.org/issue27631
There are a lot of dupliacted files, testing files and unused libraries
present in the AppImage. Removing these reduces the AppImage size
significantly.
-----
taken from Electron-Cash/Electron-Cash@cff5fb128954853c2c672e2afaa48a40050e7183
There was a problem where Python would not properly include the faketime
timestamp sometimes. This patch replaces faketime with a patch that is
used by Ubuntu for reproducible builds by exporting BUILD_DATE and
BUILD_TIME with the desired values.
-----
taken from Electron-Cash/Electron-Cash@9532508a3f466aab794fae4f8e314617d5a873f9
We build our own mksquashfs from squashfskit which supports generating
reproducible squashfs images. We use a small wrapper script to remove
the -mkfs-fixed-time which appimagekit passes but squashfskits
mksquashfs does not support.
-----
taken from Electron-Cash/Electron-Cash@dd1f106f4f500fbf993094cf73da89a5745a0e2c
see AppImage/AppImageKit#929
We already delete unused Qt modules, but we weren't deleting their PyQt5 modules.
-----
taken from Electron-Cash/Electron-Cash@e044c94677160b6e6bb1a981b22a4b85103de6cb
Importing from PyQt5.Qt is an unnecessary fallback that loads every PyQt5 module.
-----
taken from Electron-Cash/Electron-Cash@d69471b31d1f25a703588f48ee0cc5afdf1f1f2f
pkg2appimage excludes libusb-1.0.so by default for no good reason:
83483c2971/excludelist (L112)
This can cause an issue when the AppImage loads the systems libusb but the
systems libusb in turn loads libudev from the AppImage. The kernel ABI for
libusb will not be changing so it is safe to bundle it into the AppImage.
-----
taken from Electron-Cash/Electron-Cash@25d45fdcbfa335d83de876ff16e978a058d17e22
SomberNight
Axel Gembe