Add github repository to my composer project - github

Question

I like to create a new composer project. I will include code, that is not on packagist. It is a github repository. Concretely I like to include this release.
https://github.com/joomla/joomla-cms/releases/tag/4.0.0-alpha12
I expected with this composer.json to fetch the release 4.0.0-alpha12:
{
"name": "vendor/my_joomla_website",
"description": "Testing to install joomla with extensions via composer",
"type": "project",
"license": "GNU",
"authors": [
{
"name": "vendor",
"email": "myemail"
}
],
"repositories": [
{
"type": "git",
"url": "https://github.com/joomla/joomla-cms.git"
}
],
"require": {
"joomla/joomla-cms": "dev-4.0-dev#4.0.0-alpha12"
}
}
But the command comoser install did not run to the end. This is my message
composer install
Loading composer repositories with package information
[Symfony\Component\Process\Exception\ProcessTimedOutException]
The process "git clone --mirror 'https://github.com/joomla/joomla-cms.git' '/home/astrid/.composer/cache/vcs/htt
ps---github.com-joomla-joomla-cms.git/'" exceeded the timeout of 300 seconds.
install [--prefer-source] [--prefer-dist] [--dry-run] [--dev] [--no-dev] [--no-custom-installers] [--no-autoloader] [--no-scripts] [--no-progress] [--no-suggest] [-v|vv|vvv|--verbose] [-o|--optimize-autoloader] [-a|--classmap-authoritative] [--apcu-autoloader] [--ignore-platform-reqs] [--] [<packages>]...
In the end I have a vendor directory in my project folder. The content of the github repository is not there.
What do I have to do if I want to add code - hosted on github - to my Composer project?
Update
I just changed my composer.json to
{
"name": "astrid/my_joomla_website",
"description": "Testing to install joomla with extensions via composer",
"type": "project",
"license": "GNU",
"authors": [
{
"name": "vendor",
"email": "myemail"
}
],
"repositories": [
{
"type": "package",
"package": {
"name": "joomla/joomla-cms",
"version": "4.0.0-alpha12",
"source": {
"type": "git",
"url": "git://github.com/joomla/joomla-cms.git",
"reference": "4.0-dev"
},
"dist": {
"url": "https://github.com/joomla/joomla-cms/releases/download/4.0.0-alpha12/Joomla_4.0.0-alpha12-Alpha-Full_Package.zip",
"type": "zip"
}
}
}
],
"require": {
"joomla/joomla-cms": "dev-4.0-dev#4.0.0-alpha12"
}
}
Now I get this error.
composer install
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.
Problem 1
- The requested package joomla/joomla-cms dev-4.0-dev#4.0.0-alpha12 exists as joomla/joomla-cms[4.0.0-alpha12] but these are rejected by your constraint.
What am I doing wrong? I haven't assigned any dependencies or restrictions yet.

Answer 1

I'm not sure what exactly causes your "rejected by your constraint" exception, but I'm guessing it's because you're using the branch#ref version requirement which the docs say isn't actively supported. I think you could rather just use the 4.0.0-alpha12 tag since a tag isn't tied to a branch.
To fix your first issue, change your repository type to vcs (or github). Composer will detect the the repository is a Github repository and will then use the Github API to fetch the correct version of the package. The joomla-cms repository looks really big so it will probably take longer than the allowed 300 seconds to clone.
"repositories": [
{
"type": "vcs",
"url": "https://github.com/joomla/joomla-cms.git"
}
]
For your second issue, set your version to 4.0.0-alpha12:
"require": {
"joomla/joomla-cms": "4.0.0-alpha12"
}
The 4.0.0-alpha12 version of joomla-cms requires a dev version of joomla/application (joomla/application[2.0.x-dev]) so you would have to set your package's minimum stability to dev:
"minimum-stability": "dev",