Downloads and installs files¶

Simple light API to download and install files. If the file appears to be a compressed file by ending with zip, tar.gz, tgz etc, then also un-compress the file after it is downloaded. The process flow follows:

Check to see if the installed file exists. If not download it.
Otherwise, if the file has been downloaded uncompress it.
If the file could not be downloaded, uncompressed, or a file from the uncompressed file isn’t found an error is thrown.

A destination location can be specified in the configuration. It is also possible to install it in the ~/.cache/<package name> where package name is the name the installed package. For example, that would be zensols.install for the package installed for this repository.

Documentation¶

Obtaining¶

The easiest way to install the command line program is via the pip installer:

pip3 install zensols.install

Binaries are also available on pypi.

Usage¶

The below code is given in the example.

First create the installer configuration with each file to be installed as a resource as a file install.conf:

[build_resource]
class_name = zensols.install.Resource
url = https://github.com/plandes/zenbuild/archive/refs/tags/general_build.zip
# we have to give the name of the diretory in the zip file so the program knows
# what to unzip; otherwise it is named from the section, or file if `None`
name = zenbuild-general_build
# a file in the compressed archive to access; also used to indicate it was
# (already) extracted
sub_path = src/python/gtagutil
# uncomment below to keep the `zenbuild-general_build.zip` zip file
#clean_up = False

[downloader]
class_name = zensols.install.Downloader
#use_progress_bar = False

[installer]
class_name = zensols.install.Installer
# providing the `downloader` is optional
downloader = instance: downloader
# uncomment the below line, then comment out `base_directory` to use the
# package name (using the zensols.cli.ApplicationFactory--see example); using
# `package_resource` will in install a ~/.<package name> install directory
base_directory = path: install_dir
# give the installer access to the resource
resources = instance: list: build_resource

Now use the configuration to create an Installer and access an file to be uncompressed via a Resource:

import logging
from zensols.config import IniConfig, ImportConfigFactory
from zensols.install import Resource, Installer

logging.basicConfig(level=logging.INFO)

# create the installer
fac = ImportConfigFactory(IniConfig('install.conf'))
installer: Installer = fac.instance('installer')

# print the resources the installer contains
res: Resource
for res in self.installer.resources:
	res.write_to_log(logger, depth=1)

# iterate over the paths the installer creates from the resources
path: Path
for path in self.installer:
	logger.info(f'resource path: {path}')

# install the files
installer.install()

# access a file
ufile: Path = self.installer.get_singleton_path()
print(f'uncompressed file: {ufile}, exists: {ufile.is_file()}')

# optionally remove any installed files
self.installer.clear()

This code creates a new directory with the un-zipped files in install_dir:

INFO:zensols.install.installer:installing zenbuild-general_build to install_dir/zenbuild-general_build
INFO:zensols.install.download:creating directory: install_dir
INFO:zensols.install.download:downloading https://github.com/plandes/zenbuild/archive/refs/tags/general_build.zip to install_dir/zenbuild-general_build.zip
general_build.zip: 16.4kB [00:00, 40.1kB/s]
INFO:zensols.install.installer:uncompressing install_dir/zenbuild-general_build.zip to install_dir
patool: Extracting install_dir/zenbuild-general_build.zip ...
patool: ... install_dir/zenbuild-general_build.zip extracted to `install_dir'.
INFO:zensols.install.installer:cleaning up downloaded file: install_dir/zenbuild-general_build.zip

First the program checks to see if the target directory (name property in the zip_resource section) exists. It then downloads it when it can’t find either the target directory or the downloaded file.

If the program is run a second time, there will be no output since the installed directory now exists.

Changelog¶

An extensive changelog is available here.

License¶

MIT License